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                   Sunday, May 7, 2017

Becoming a "storm snob": Plains forecast update for May 7

By DAN ROBINSON
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The phenomenal events of last May have pushed me solidly into a new phase of my observing life, one that many will call that of a "storm snob". Storm snobbery means you go only the best of the best, and sit out the rest. I'm not anxious to get out onto the Plains to observe storms just anything - I'm waiting for a true quality setup. And I'm fine with the possibility that it won't happen this year!

Living in the Midwest, I get many low-quality, marginal setups to observe storms year-round, some of which produce. I've seen an EF4 already this year 60 miles southeast of my apartment! If I'm going to drive 8-12 hours from home, use PTO from work and spend money on hotels, it's got to be for something that I can't get here in my backyard. By that I mean a Dodge City, Rozel or a Bennington (1 or 2) caliber event, and I haven't yet seen anything like that in the current medium-to-long ranges of forecast models.

What I see in the models right now are a few marginal Plains days not unlike what I see here at home many times per year. Could those produce something nice? Sure, they certainly could. Campo and days like April 14 in Dimmitt Texas can always happen on low-risk Plains setups. But the reality is, most of the marginal days DON'T produce. To see the marginal-day gems, you have to observe storms virtually ALL of them. I'm simply OK with missing the Campos and Dimmitts. I don't need to see EVERY tornado that happens anywhere in the world or even in the Plains and Midwest. No observer sees every tornado, not even the best of storm observers. It's unrealistic (and insanely expensive) to observe storms to catch *everything*.

So let's get to the specifics of the forecast. An "omega block" upper pattern is in place across the US right now, with deep troughs in the east and the far west. This means ridging and/or northwest flow over the Plains and Midwest, the "downtime" pattern for severe weather as it keeps moisture from returning north from the Gulf of Mexico. The western jet is shown eventually "cutting off" into a closed circulation which drifts slowly east, opening into a trough again as it moves over the southern Plains:

GFS forecast for May 10
GFS forecast for May 10

These "cutoff lows" are typically bad for observing, as they usually end up with unidirectional wind profiles with lots of clouds and rain. Nonetheless, they can produce one or two low-grade storm observation days as the initial southwest flow aloft promotes some moisture return northward underneath of the stronger midlevel and upper-level winds. That's what is shown now, with Wednesday along the dryline in Kansas, western Oklahoma and the Texas panhandle looking like the best of the mix. Unfortunately, instability just looks to be too low for this to be on my radar for a trip. After that, yet another cold front is shown sweeping the moisture back into the Gulf, and doesn't look like it will return again in meaningful quantities on the dryline for quite some time.

With Wednesday looking like a low-end setup and the pattern following showing no signs of anything expedition-worthy, I don't expect a Plains trip to begin within the next 10 days.

The following table charts the probabilities for a Plains weather expedition taking place for the date ranges shown:

2017 Plains Storm Expeditions - Probabilities as of May 7
May 7-90%
May 1010%
May 11-165%

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