Tornado in Greensburg, Pennsylvania

With sunshine and cold temperatures forecast through Monday and beyond here in West Michigan, I’d say we’re in the process of becoming nicely ridged. The GFS and NAM agree on a little trough digging into the southern plains on Saturday, with a surface low just southeast of the trough axis fetching moisture up into Dixie Alley. Shear is ample, as you’d expect this time of year, so maybe the South will see some organized storms. But up here in the north, none of that matters. Chilly and uneventful are the words for us this next week or so.

So it’s nice to know that chasers got in a little early play Tuesday in Iowa. The Storm Prediction Center shows 18 tornado reports, including the photogenic Creston tornado: a beautiful, sunlit tube that a number of chasers captured on camera and video. That had to have been a sight to see, and I congratulate those of you who witnessed it.

The big surprise came a day later, though, yesterday in Greensburg. No, not Greensburg, Kansas; Greensburg, Pennsylvania, 25 miles southeast of Pittsburgh. Who would have expected a tornado out there in March in hill country? True, the SPC had issued a moderate risk for the east, but that was considerably farther south, and the affected area was teetering on the very edge of a light risk. The bulk shear certainly was capable of producing supercells, but I figured they’d just be hailers. I had written off the setup as a straight-line wind event.

Yet a supercell drifting across the jumbled terrain of southwest Pennsylvania exhibited a pronounced mesocyclone that culminated in the Greensburg tornado–this in an environment where temperature and moisture that seemed inadequate to begin with dropped rapidly over the course of just a few miles. Lapse rates had to have been steep in order to sustain the storm in those conditions.

As near as I can judge, the Pennsylvania supercell appeared to drift along some kind of warm frontal boundary, with just enough moisture and heat to sustain it and enough helicity to produce a tornado. VAD wind profiles at KPBZ were straight from the west at all levels; farther east-northeast, however, at KCXX, backing surface winds veered rapidly with height, providing decent low-level torque.

But that was, I believe, in colder air. It strikes me as a pretty delicate balance that sustained the Pennsylvania supercell. Greensburg is located in the Allegheny Plateau in the foothills of the Appalachian Mountains, so perhaps the terrain may have influenced local boundary-layer winds enough to produce the Greensburg tornado. I can only speculate. The Plateau overall is mountainous, but when I look at photos of Greensburg, the town appears to be situated in a fairly level area. What the case is five miles southwest in Hempfield Township, where tornado damage was reported along Route 136, may be a different matter. I don’t know the area. However, the highway map shows curvy roads consistent with a rugged landscape.

It’s fun to think about when there’s no other weather to contemplate, which right now there isn’t. But it’s on the way. It’s spring, the sun is higher, the Gulf is setting up shop, and Storm Season 2011 is moving in.

ADDENDUM: Having looked at a few videos of the tornado in Hempfield since I made this post, I’m inclined to think that terrain wasn’t a factor. Looks like the right ingredients just came together on the mesoscale level. Interesting storm!

Video: One for Daddy-O

The classic Cannonball Adderly album Something Else includes a wonderful Bb minor blues written by Cannon’s brother, Nat, titled “One for Daddy-O.” The moody head fits the slow, shuffle groove perfectly and sets the tone for some fun improvisation.

I videotaped this tune with my new Panasonic HDC-TM700 camcorder in my buddy Ed Englerth’s basement studio, Blueside Down, the same evening as I taped “The Summer Knows.” My Band-in-a-Box accompaniment doesn’t capture the original arrangement’s antiphonal quality, but it did what I needed it to for a simple, low-key recording.

Video: The Summer Knows by Michel Legrand

Ever since I heard Phil Woods’ rendition of it, I’ve loved Michel Legrand’s haunting ballad “The Summer Knows.” The theme song for the 1971 movie The Summer of ’42, the tune showcases Legrand’s ability to extract tremendous beauty and emotion from a simple, four-note motif.

Videotaped with my brand-new Panasonic camcorder in Ed Englerth’s basement studio, here is my version of “The Summer Knows.” Just me on my beloved Conn 6M Ladyface, the trusty Band-in-a-Box orchestra (even gives you string if you want them!), and Ed operating the video camera. Maybe not studio quality, but the internal microphone didn’t do a bad job. I hope you like it!

Sax at the Park

Yesterday was gorgeous though a bit chilly–what can you expect in Michigan in mid-March, after all?–and I was anxious to put my new camcorder through its paces. So off to Fallasburg Park I went. Located north of Lowell on the Flat River, the park is a beautiful location adjacent to a historical village complete with a functional and well-trafficked covered bridge.

I had meant to use my tripod, but when I got to Fallasburg I discovered that I had left behind the plate that screws into the bottom of my camcorder so it can engage with the tripod’s quick release. Fortunately, I was able to induce a young guy who was at the park with his wife and little boy to film me. The result: not too shabby for a whimsical production using an on-the-spot cameraman! Just a little free-form saxophone improvisation–nothing fancy, just fun. Start with a note and then see where it takes you. Pardon the wind noise about halfway through–it was pretty breezy out there.

This is my first attempt at embedding a video in WordPress. Let’s see how it goes.

The Tritone Scale

Many years ago, when I first became aware of chord superimposition, I hit upon a unique concept. Inspired by my new awareness of tritone substitution, I thought, What would happen if I took two major triads a diminished fifth apart–C and F#, for example–and crunched all the notes together to form a scale? Wouldn’t that be cool!

Of course it had already been done, just not by me. My musical innovations tend to be in the same league as my discovering fire, gravity, the wheel, Chicken McNuggets, things like that. In this case, I had stumbled upon the tritone scale, so named for obvious reasons.

Think of a diminished scale with two notes missing, kind of like a smile with a couple teeth knocked out, and you have the tritone scale. The standard C half/whole-step diminished scale consists of the notes C, Db, D#, E, F#, G, A, Bb, C. If you remove the notes D# and A, the result–as shown in the first example (click to enlarge)– is a C tritone scale: C, Db, E, F#, G, Bb, C.

The tritone scale falls in the class of scales called hexatonic (six-tone), which also includes the augmented, whole tone, and blues scales. Since the tritone scale is derived from two major triads, you’ll of course find those triads contained in it. You’ll also find two dominant seventh chords native to the tritone scale. (See second and third examples.)

The leap of a minor third between the second and third tones, and between the fifth and sixth tones, renders the tritone scale asymmetrical. That asymmetry lends color to the scale and makes it a good source of angularity. By its nature, the tritone scale will make you think a bit differently than you would if you were using a complete diminished scale–with which, I should add, the tritone scale is interchangeable.

The last two examples in the image are actually exercises on the tritone scale. The first is a straightforward scale exercise. The second alternates the two triads that are native to the scale, taking you through their different inversions. As always, play each exercise through the full range of your instrument.

How to use the tritone scale in improvisation

All that theory is fine, but what about actual application? Naturally you want to know how the tritone scale is used.

Use it anywhere you would use a whole/half-step diminished scale. The most obvious use is with a V7b9 chord. Since, as I’ve said, the tritone scale is interchangeable with the diminished scale, you can use it with any of four different dominant chords. For instance, you can use the C tritone scale with C7b9, Eb7b9, F#7b9, and A7b9. Note that two of these chords, the Eb7b9 and A7b9, are built upon the “missing notes,” which means you can skate around the chord roots without ever landing on them.

Tritone scales built on the roots of dominant chords pack the advantage of having the tritone substitution built right into them. The second exercise (last example) demonstrates this beautifully and is one you definitely should get under your fingers.

The tritone scale also adds interest to minor scales. Use the seventh of the scale as the chord root. Another way of thinking of it is, use the note that’s a major second above the chord root as the tonic of your scale. For example, if the chord is a Bbmin7, use a C tritone scale.

If you want a good example of the tritone scale in action, the first part of Michael Brecker’s solo on “Quartet Number 3” in the Three Quartets album by Chic Corea is a tritone tour de force.

And with that, I’ll sign off. Practice hard, experiment, and have fun!

Storm Chasing for TV 8: Taking It to the Next Level

I met this afternoon with WOOD TV 8 meteorologists Kyle Underwood and Matt Kirkwood to discuss chasing storms for TV 8. I’m excited about the prospect of taking what has hitherto been a longstanding hobby of mine, albeit one of passionate focus, and upgrading it to the semi-professional level.

When Ben Holcomb left Michigan last year for the grand storm chaser’s Mecca of Oklahoma, he offered to hook up several of his Troll compatriots with TV 8 to fill his vacancy. One of those chasers was me. At the time, gracious as Ben’s offer was, I nevertheless felt I had to decline due to a pathetic lack of equipment. But the thought of the opportunity kept nagging at me, so I finally decided to take a chance and purchase some stuff I really can’t afford out of the sense that I can’t afford NOT to do so. My gut instinct, which I hope is right, is that my investment will pay for itself over the storm season. Thus, motivated by the possibility of having my avocation become self-sustaining, with tax writeoffs on mileage and expenses as an added incentive, I dropped a healthy chunk of cash on the following items:

  • ♦ Panasonic HDC-TM700 video camera with 32 gig internal memory
  • ♦ 32 gig HDSC memory card
  • ♦ Logitech Pro 9000 webcam for live streaming video

The cash outlay is not one I take lightly at a time when my money is tight. It’s a good barometer of how seriously I take storm chasing. But after speaking with Kyle, I’m impressed that WOOD TV appears, on its part, to be equally serious about developing a topnotch crew of local chasers. Commitment matched with commitment is a good thing.

Besides my purchase of equipment, over the past few weeks I’ve also invested a good amount of my time and a bit more cash studying for my HAM radio test, which I took and passed last Friday. Today I finally found my new call letters in the FCC list, so I’m now officially good to go as a HAM operator.

Additionally, per Lisa’s recommendation, I’ve registered with Vimeo, and after giving it an introductory look-over, I feel good about that resource as an online video repository. Vimeo should allow me to start embedding my footage in future Stormhorn.com blog posts, and it may also serve as an easy way to make my material accessible to WOOD TV.

All that now remains to be done is to sign up with Chaser TV and start getting familiar with the live streaming video. That and familiarize myself with Vimeo and its capabilities. I’ve got a bit of a learning curve ahead of me between now and April 1, when WOOD TV hopes to begin tapping into its chaser pool.

Since all the chasers in that pool know each other–it’s a small, connected community, as I’m sure storm chasers anywhere will understand–there’s the potential for some decent synergy on a chase day. What one man misses, another is likely to catch.

So…a new experience lies ahead for 2011. No way am I missing big weather when it shapes up out west in Tornado Alley. But if statistics mean anything, this year’s La Nina could bring a bonanza of severe weather closer to home, even to my back door of West Michigan. When it does, I’ll be on it, dashcam streaming and camcorder a-blazin’.

“Tornado Alley” Chaser Party

Saturday in Chicago was possibly the best inauguration of a new chase season that I’ve experienced. A little time to take in some of the Museum of Science and Industry; then watch Sean Casey’s long-awaited new Imax film, Tornado Alley; then head over to Skip Talbot’s place and hang out with fellow chasers and watch storm chasing videos…what could be better?

It was good to reconnect with Michigan native Ben Holcomb, whom I hadn’t

seen since he moved to Oklahoma City last year; with fellow Michiganites Nick Nolte and B. B. and L. B. LaForce; and with Scott Bennet, Adam Lucio, and Danny Neal, comrades in arms along with Ben from the infamous Field Fiasco of May 22 in South Dakota. Plus, it was a pleasure to finally be able to meet some people whom I’ve known of for a long time, including Skip Talbot, who hosted the fete.

My buddy Bill Oosterbaan and I left Grand Rapids for Chicago around 10 a.m. Saturday and arrived at the museum with time to spare. Fifty or sixty miles down the road, I realized that I had left behind a couple 4-packs of barley wine which I had bought exclusively for the occasion. It was a minor downside to a great trip. Drat! Now I guess it’s up to Lisa and me to drink all that barley wine–an onerous task, to be sure, but we’ll manage it. In fact, we’ve already whittled away the workload by half, and I’m contemplating a bottle tonight after I’ve finished writing this post.

Watching tornado videos and hanging out with chasers has got me hankering to see some storms. It won’t be much longer now! And this year I’ve got everything I need to kick things up a notch or two with a great new camcorder and live streaming video. Wednesday I meet with one of the Channel 8 meteorologists to discuss doing some media chasing–connection courtesy of Ben Holcomb. Thanks, Ben!

But back to the party, here are a few photos. If you were there and don’t see yourself here, sorry–I didn’t intentionally leave you out. I just didn’t get everyone, and these shots are merely representative.

Skip, thanks to you and Jenny for opening your home to us. To everyone else: great seeing you, and I look forward to crossing paths with you again at the edge of the meso.

What Do You Need to Chase Storms?

“How do I become a storm chaser?” If you’ve been asking that question, this post is for you. I write it with some reservation, knowing that there are people more qualified than I to address the topic. That being said, I’ve been chasing storms with some modicum of success long enough now that I’m confident my insights can have value for those who wonder what it takes to get started.

What do you need in order to chase storms? I’ve seen some lengthy lists developed in response to that question. The input is good, but it can overcomplicate matters, and too much of it all at once can be daunting. If you focus on the word “need,” the answer is much simpler. That’s my approach here: strip it down to the basics, then build from there.

The Foundational Stuff

Here, in my opinion, are the few things that a storm chaser cannot do without:

◊ A roadworthy vehicle, be it yours or a chase partner’s. By “roadworthy,” I mean one that can successfully manage the terrain you’ll be chasing in. If your territory is the flatlands of Illinois and Indiana, or if you intend to stay on main roads that aren’t likely to run out of pavement, then pretty much any vehicle will serve you. On the other hand, if you plan to chase down west Kansas backroads, then you’d better have four wheel drive and great tires; otherwise, the clay out there will slurp you down and ruin your day.

◊ Road maps. Self-explanatory, I think.

◊ Money. You need gas for the tank, right? And maybe a burger along the way.

◊ Basic knowledge of storm structure. Sure, you can chase storms without knowing anything about their features and behavior. But you can’t chase them safely, and the odds of your chasing them successfully are slim. So learn all you can. West Texas storm chaser Jason Boggs has created an outstanding list of educational resources that you can access as quickly as you can click your mouse. Jason’s list mixes basic and advanced material together without discriminating between them. It’s all good, but you should start with the fundamental stuff that deals with storm structure. Veteran chaser Gene Moore’s material on identifying storm features is a good first bet.

Also, a quick plug for Stormtrack, the online informational clearing house, learning resource, and virtual community for storm chasers worldwide. You’ll learn an awful lot just browsing the forum.

One final word on learning: there’s nothing like a mentor. If you can hook up with a seasoned chaser who’s willing to show you the ropes, grab the chance. You can shorten your learning curve significantly. But if such a person isn’t available to you, don’t let that stop you.

◊ Light bars for your vehicle. Absolutely mandatory. How is the world going to know you’re a storm chaser if your vehicle doesn’t resemble a mobile road block?

JUST KIDDING! Don’t worry about light bars just yet.

That’s it for the essentials. Pretty basic, aren’t they–just you, your vehicle, maps, money, and a bit of knowledge. It really doesn’t take any more than that to intercept storms. The main thing is to get out there and do it.

Assuming that you’ve got the fundamentals in place, let’s look next at a few things that will make your chases more successful and your experiences more rewarding.

Important Tools of the Trade

Can you chase storms without a laptop equipped with radar software and mobile data? Of course you can! Ask any chaser who’s been around ten years or longer and they’ll tell you. When the pioneer chasers began paving the way for the rest of us, they did it without all the trimmings. Even Rain-X wasn’t trademarked until 1972, and David Hoadley was chasing storms long before then.

For that matter, I didn’t have any of the following tools of the trade for many years during my own illustrious ascent as a storm chaser. Of course, I didn’t see any tornadoes, either, so don’t take your cues from me. I will tell you that I had a lot of fun learning the slow, hard way. However, my successes came when I started adding a few resources, concurrent with improving my knowledge of forecasting and storm morphology.

All that to say that while the items below aren’t absolutely indispensable, that doesn’t mean they’re not important. They’re very important, and not many chasers today, including the veterans, chase without them.

◊ Laptop computer. It’s your control center.

◊ Power inverter to power your laptop and charge your cameras.

◊ Radar software. Besides a laptop, this should be your first purchase on the list of storm chasing tools. I recommend GR3, at least to begin with. It’s the one used by most chasers, and for good reason: it’s a fabulous program designed specifically for storm chasing, with incredible functionality and flexibility. Just get it, okay? For $80, trust me, you can’t go wrong. For that matter, you get a free trial period that lets you play with the program for a few weeks before you slap down your money.

◊ USB modem and mobile Internet connection. Your best bet is to purchase a USB modem outright; that way you’re not locked into a 2-year contract, and you can deactivate your account during the off-season instead of continuing to pay for data you’re not using. As for Internet connection, Verizon currently provides the best data coverage nationwide, and a lot of chasers use it. Others prefer Sprint, also a good choice. Where you’ll be chasing is something to consider in making your decision.

◊ Radar data feed for GR3. You can use the free feed that NOAA provides. But a lot of chasers prefer a dedicated feed such as those provided by Allisonhouse and MichiganWxSystem. Priced around $10 a month, such a feed is well worth the money.

Nowadays more chasers are using Android phones with radar apps. Not being the geeky type, and also not having the cash, I haven’t looked into these setups. I like having a large display in front of me anyway instead of a tiny screen, but I’m not knocking those who are working with with handheld units. The point is, however you get it and however you display it, you want good, detailed radar information delivered to you with timely updates.

◊ GPS and mapping software such as De Lorme. You’ll also want a serial port emulator that will allow you to use GPS simultaneously with both your map and your radar.

◊ Rain-X. Worth every dollar it costs, and it doesn’t cost much.

SPC Convective Outlooks link. After all, all your great gear doesn’t amount to squat if you can’t find storms! Since you’re new to storm chasing, chances are you don’t have the knowledge to make your own forecasts. Start acquiring it now, beginning with the Storm Prediction Center’s convective outlooks page. It will do two things for you: 1) show you graphically whether and where storms are expected to fire, and 2) through its detailed forecast discussions, familiarize you with the terminology and thinking that go into severe weather forecasting.

◊ Light bars. Don’t leave home without them. How will drab, ordinary, non-storm-chasing mortals know you’re a storm chaser unless…oh, hey, wait a minute. Sorry, we’re still jumping the gun. Forget I mentioned light bars. You don’t need light bars. Not now, anyway. Patience, patience!

Moving On

◊ Station obs, upper air maps, and other forecasting data. Here’s where it gets fun! Making your own forecasts is what separates the be’s from the wannabe’s, and sooner or later you’ll want to try your hand at it. Luckily for you, a cornucopia of forecasting resources is available to you for free online. So start acquainting yourself with the tools of the trade. Check out the tabs at the top of my Storm Chasing page for starters. Also, take a peek at the resources available on my friend Kurt Hulst’s site, Midwest Chasers.

◊ Anemometers, weather meters, and other gadgets. Once you start chasing, you’ll soon run into vehicles tricked out with various devices useful for personal monitoring of wind speed, wind direction, moisture, barometric pressure, and other localized weather conditions. You don’t need any of this stuff in order to enjoy success chasing storms. But depending on how deep and techy you want to get, you might decide that some of it is for you. Just get it for the right reason: to enhance your chasing, not to impress the world with a mess of whizbangs and dingdongs ornamenting the top of your vehicle.

Me, I like to keep things simple. Nothing about my car shouts “storm chaser,” and the only gadget I use is a Kestrel 4500 hand-held weather meter. It’s a cool little device, a regular Swiss Army Knife filled with all sorts of nifty features that I don’t need. I use it mainly to get local, real-time reads on the dewpoint, temperature, and wind speed, information that I do find very useful.

◊ Camera and/or camcorder. A no-brainer if you want to capture visual images of your chases.

◊ Communication equipment. While it probably goes without saying, you should at least carry a cell phone with you. A lot of chasers are also HAM radio operators, and this spring I’ll be joining their ranks with a hand-held unit of my own. I’ve chased for fifteen years without HAM, but I’ve seen the benefits of having it.

◊ Spotter Network. A service of Allisonhouse, Spotter Network interfaces with your radar software and GPS to show other chasers where you’re at and to show you where everyone else is positioned. More importantly, it allows you to quickly and efficiently submit reports of severe weather online from your location.

◊ “NOW can I have a light bar? Can I? Pleeeeze?”

Oh, good grief. Yes, fine, all right, go, get your precious light bar if you must. Buy seven or eight of the damn things. Pick up a spotlight or two while you’re at it. Perish forbid that you should settle for anything less than the candlepower of a NASA launch pad.

My serious opinion: any gadgets you purchase should have a genuinely practical application. I don’t own a light bar myself because I don’t need one. I’m not trained as a first responder, and in the event of an emergency, my best response normally won’t be to clear the road for myself or alert others to my presence, but to get the heck out of the way of emergency personnel who need to get through.

You, on the other hand, may in fact have medical or emergency training and a legitimate use for a light bar. If so, then get one. If not, what’s the point?

And this leads me to comment on one final, vitally important aspect of storm chasing…

Your Attitude

Even as storm chasing has captivated the public through documentaries and reality TV shows, it has also gotten a black eye in some parts of the country due to the misbehavior of irresponsible yahoos. More of these jokers are surfacing all the time. So let’s be clear: chasing storms does not give you license to act like a self-centered idiot. Use common sense. You don’t own the road, so drive safely and respectfully. If you want to stop and film, find a safe place to pull aside so you don’t impede traffic. Drive at a sane speed that doesn’t endanger others, and bear in mind that hydroplaning is a more serious danger to chasers than tornadoes.

Also, have some respect for people who have been chasing for a while. Some experienced chasers have expressed disgust, anger, and disinclination to continue sharing their knowledge after encountering know-nothing newbies who think they know it all. So remember, as a neophyte you’ll earn respect by showing respect. Humility, a thirst to learn, and passion for the storms will get you places that posturing and arrogance never will.

‘Nuff said. Good luck, stay safe, and have fun.

Preparing for Chase Season 2011

Last night I pulled the trigger on a new Panasonic HDC-TM700 camcorder from B&H. I feel a bit of angst in saying this as I’m not in a position where I can easily afford the $750 this pooch is costing me. But neither can I afford to pass up the opportunity to do some chasing for local media, and I’m hoping that this year will furnish enough action that the camera will pay for itself fairly quickly. The old adage, “It takes money to make money,” applies here.

The Panny is a lot of camcorder for the money, too. It has gotten consistently rave reviews. And my buddy Ben Holcomb, who does some great work, has been absolutely delighted with his TM300, which is the predecessor to the model I’ve ordered.

Besides storm chasing, I can also use the camera to make video clips of my sax playing. That will greatly enhance my ability to publicize myself. So, all things considered, I’m telling myself that I’ve made a good investment at a time when money is tight.

With the new camcorder on the way, a HAM radio license is also in the works. For the past two weeks I’ve been studying using Ham Test Online, and this Friday evening I’ll be heading to the Red Cross building in Grand Rapids to take the test. I don’t know why it has taken me this long. I plunked down my $24.95 for the 2-year study subscription over a year ago, and then I procrastinated and procrastinated. Finally a switch flipped in me, though, and I moved from indifference to saturating myself in the HAM material with nigh-obsessive focus. With added incentive from my friend Duane of a free hand-held unit, I’m ready to rumble this Friday and will soon have a valuable new communication tool for storm chasing this spring.

Still to do: get a dash mount and maybe an el-cheapo, used camcorder to go with it. Register for live chasing with Chaser TV. And that’s about it. At last, after all these years, I’ll finally be equipped with everything I needed to not only chase successfully, but also record my chases with good video and still images.

Now if we can just get some storms!

Tornado Safety: Is It a Good Idea to Seek Shelter in a Ditch?

With storm season nearly upon us, now is a good time to revisit a post on tornado safety which I wrote back in November.

Our understanding of tornadoes in the 21st century eclipses what we knew about them, or thought we knew, thirty years ago. Moreveover, our sophisticated warning system has made us much safer during severe weather events today than in decades past. Yet, while the NWS has done what it can to debunk them, some outdated myths still persist.

The notion that motorists who see a tornado approaching should leave their vehicles and seek shelter in a ditch isn’t exactly a myth. Rather, it’s a gray area that you may want to consider more deeply before you bet your life on it. So give this article a read–and we’ll both hope that you never have to put it to the test.