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August 17th-21st Severe Weather Event


HillsdaleMIWeather

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Henry Margusity on Accuweather says there'll be a major severe outbreak on Wednesday

 

Severe weather will develop across parts of Montana today, then move into the northern Plains Saturday. Both areas will have damaging winds, hail and perhaps a tornado or two.

The weather pattern due to the crash in the El Nino will become very active next week with more flooding, severe storms and extreme heat. The Midwest will have a major outbreak of severe weather Wednesday.

JfbKHrH.png

 

http://www.accuweather.com/en/weather-blogs/meteomadness/severe-storms-into-saturdayweather-gets-wild-next-week/51759778

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Oh Henry.

It always worries me when I am in one of Henry's severe storm or snowstorm zones, since he busts so much. It was nice to see every single model at 12z today (except the long range NAM) agree with what the GFS has been saying for a couple days with a 995mb low around the wisconsin / minnesota border area today. As usual it will come down more to how much crapvection and clouds will there be on Wed.

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ILN 

 

 

.LONG TERM /WEDNESDAY THROUGH SUNDAY/...
THIS PERIOD IS CHARACTERIZED BY THE PASSAGE OF TWO SIGNIFICANT
SHORTWAVE TROUGHS...ONE ON WEDNESDAY NIGHT AND ANOTHER NEXT SUNDAY.
IN BETWEEN...A PERIOD OF QUIET WEATHER IS EXPECTED.

AT 12Z WEDNESDAY...LONGWAVE PATTERN OVER NORTH AMERICA WILL FEATURE
RIDGING OFF BOTH COASTS...AND A TROUGH OVER THE NATION/S MIDSECTION.
A STRONG SHORTWAVE TROUGH WITHIN THE CNTL CONUS LONGWAVE TROUGH WILL
BE CENTERED IN SOUTHERN MINNESOTA...WITH STRONG MODEL CONSENSUS OF
THIS FEATURE/S TIMING AND DEPTH. THROUGH THURSDAY...THIS SHORTWAVE
WILL EJECT RAPIDLY NNE INTO ONTARIO...WITH ANOTHER POTENT SHORTWAVE
DIGGING SOUTHEAST FROM ALASKA INTO THE PACIFIC NORTHWEST BY FRIDAY
AFTERNOON. THIS SHORTWAVE WILL DEEPEN SOMEWHAT AS IT SHIFTS INTO THE
CNTL CONUS LONGWAVE TROUGH...AND MOVE IN SIMILAR FASHION TO THE
MIDWEEK SYSTEM...WITH THE BULK OF THE KINEMATICS AFFECTING THE UPPER
MISSISSIPPI VALLEY INTO THE WESTERN GREAT LAKES NEXT WEEKEND.

IN THE DETAILS...ON WEDNESDAY MORNING A STRONG COLD FRONT ATTENDANT
TO THE FIRST MINNESOTA-BASED SHORTWAVE WILL STRETCH FROM WISCONSIN
TO MISSOURI. OVER THE OHIO VALLEY...A MOIST AND WARM AIRMASS WILL BE
ENTRENCHED WITH PWAT AROUND 1.75" AND WEAK SWLY TROPOSPHERIC FLOW
AHEAD OF THE FRONT AND ON THE BACKSIDE OF THE WRN ATLANTIC RIDGING.
FCST SOUNDINGS SUGGEST WEAK-MOD INSTBY DEVELOPING WITH HEATING THRU
THE DAY WED...AND WHEN COUPLED WITH /WHAT APPEARS TO BE/ A WEAK
DISTURBANCE SHIFTING OUT OF THE CNTL MS VLY AHEAD OF THE COLD
FRONT...SCT SHOWERS AND STORMS SHOULD DEVELOP IN A LOOSELY
FOCUSED/LOOSELY ORGANIZED FASHION THROUGH THE DAY. THIS...AND
REMNANT UPSTREAM CLOUDS FROM PRIOR CONVECTION...SHOULD KEEP TEMPS IN
THE LOW 80S BUT QUITE MUGGY ON WED.

AS THE COLD FRONT SWEEPS EAST WED EVENING...ONE OR TWO SCT-BKN LINES
OF STORMS WILL LIKELY CROSS THE FORECAST AREA. NOT OVERLY ENAMORED
WITH SVR WX SETUP...STRONGER FLOW /SHEAR/ LAGS TO THE COOL SIDE OF
THE SYNOPTIC FRONT...AND STRONGEST DCVA WITH THE SHORTWAVE TROUGH
PASSES WELL TO THE NORTHWEST. MUCAPE/EFFECTIVE SHEAR OVERLAP IS
WEAK...WITH AOB 1500 J/KG AND 25KTS RESPECTIVELY BEING SHOWN BY MANY
OF PAST GFS RUNS
...HOWEVER A FEW SREF MEMBERS HAVE A LITTLE MORE
ROBUST INSTBY. EITHER WAY...INCREASED DYNAMICS...FRONTAL LIFT...AND
WEAK-MOD INSTBY/FLOW SHOULD BE ENOUGH FOR AT LEAST SOME ORGANIZED
STORM THREAT...MAINLY IN WESTERN OH/SERN IND...AND MAINLY A DAMAGING
WIND THREAT. RIGHT NOW SETUP NOT OVERLY IMPRESSIVE BUT WILL CONT TO
WATCH.

 

 

In other words...  :sleepy:

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Lows are pretty stacked up by the time we get to Wed, which will make for largely unidirectional wind profiles.  Looks like a pretty decent severe wind event to me in the instability axis.  Would imagine convection takes off pretty early in the day, relatively speaking given the impressive forcing.  Also could be a situation where ongoing late night/early morning convection re-invigorates and becomes the main show.  The western 2/3rds of lower MI, and northern IN look to have the best shot at widespread severe at this point to me.  Should be fun to watch.

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Beaides what's been mentioned, early occlusion of the low could also throw a wrench into things, as the instability/moisture axis along with the values within said axis becomes increasingly narrow and pinches off.

All things considered, given seasonal trends locally, I have very low (though non-zero) expectations for this event.

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Yeah....as it looks now, widespread wouldn't be a word I would use with severe...but a strong SLP can overcome a lot to hit someone hard at some point.

@IMBY....looks like some beefy totals could pop up in spots with repeated rounds and slower moving rounds...severe still on the table certainly...but not a given

Iowa could have a pretty decent day tomorrow though WRT severe

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South Central IA looks pretty good tomorrow on the 4km NAM and pretty decent farther west on the 12km. Considering going chasing since I have the day off. Anyone gonna be out there?

 

Would love to if work wasn't in the way.  Good luck if you head out there.  

 

Liking our area for some pretty decent storm action later this afternoon.  Getting some nice heating ahead of that incoming cold front.  NAM lays down 2-3" of rain in this area.

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