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May 25th Severe weather thread


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Take note of the gravity waves across the High Risk area. Classic signal of intense turbulence and another active day. For anyone interested, I have two excellent articles about the implications of gravity waves and subsequent convective activity from the American Meteorological Society (AMS) the first is my favorite, however the second is relevant as well.

First Publication

Second Publication

Where exactly would the gravity wave look like?

EDIT: Nevermind:

cloud_gravity_waves.jpg

http://pcl.physics.uwo.ca/science/gravitywaves/

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Where exactly would the gravity wave look like?

EDIT: Nevermind:

PIA04349-small.jpg

I'm going to post this for anyone interested. Take a look at the clouds in the red circles and take note of the wave-like feature, now in the second image, notice how they line up in the high Risk area. I'm not saying gravity waves are the tell-all, but it's been my experience they signal an area for deeper convection during an outbreak.

post-1389-0-96985800-1306331200.jpg

High Risk overlay:

post-1389-0-24342800-1306331425.jpg

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BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL

859 AM CDT WED MAY 25 2011

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* TORNADO WARNING FOR...

SOUTHEASTERN IROQUOIS COUNTY...

WESTERN BENTON COUNTY...

* UNTIL 930 AM CDT/1030 AM EDT/

* AT 854 AM...TRAINED WEATHER SPOTTERS REPORTED A TORNADO 1 MILE

WEST OF HOOPESTON...OR 7 MILES SOUTHEAST OF CLAYTONVILLE. DOPPLER

RADAR SHOWED THIS TORNADO MOVING NORTHEAST AT 50 MPH.

* THE TORNADO WILL BE NEAR...

MILFORD AROUND 905 AM.

STOCKLAND...FREELAND PARK AND DUNNINGTON AROUND 1010 AM.

SHELDON AROUND 920 AM.

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Surprised to see reports of tors touching down so early this morning...now north of Hoopeston moving into IN and earlier near Monticello IL. Also surprised at issuance so early of tor watch for most of IN. Will probably see a PDS watch down in southern IL southward in the high risk area later today. Initial line of t storms approaching Elkhart from the sw as sky is darkening now in that direction.

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Warmer temps now forecasted for today and tomorrow. I'm assuming that's because the low is going further north than expected? Not by much but enough to raise the temps here on the borderline of the warm front.

Also surprised to wake up to a heavy storm since it got down into the lower 50s and low humidity last night.

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Check the speed

SEVERE WEATHER STATEMENT

NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL

911 AM CDT WED MAY 25 2011

ILC075-INC007-251430-

/O.CON.KLOT.TO.W.0011.000000T0000Z-110525T1430Z/

IROQUOIS IL-BENTON IN-

911 AM CDT WED MAY 25 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN BENTON AND

SOUTHEASTERN IROQUOIS COUNTIES UNTIL 930 AM CDT/1030 AM EDT/...

AT 907 AM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO. THIS

TORNADO WAS LOCATED NEAR STOCKLAND...MOVING NORTHEAST AT 75 MPH.

A TORNADO WAS REPORTED 1 MILE WEST OF HOOPESTON BY A TRAINED SPOTTER

WITH THIS STORM.

THE TORNADO WILL BE NEAR...

SHELDON AROUND 915 AM CDT.

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The questions for me here in Memphis revolve around low-level shear and LCLs. If these remain favorable into the afternoon...a very significant tornado threat may evolve. Otherwise...it could play out like DFW last night...supercells still quite possible...with very large hail and weak tornadoes...but maybe we'd escape a strong-violent threat...at least this far south.

Keeping winds backed S-SSE will probably be key...as well as surface temperatures. Forecast is near 90 Today...keeping numbers down a few degrees from that may actually be worse IMO since it would keep LCLs favorable. Its already plenty unstable...its not like sun is that necessary Today...

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Today ought to be interesting! I woke up to a T-Storm and the SPC lifting the Slight Risk well North into Southern MI. So far so good!

Today is one of the few days I won't write off due to convective debris...although this is ridiculous, I wasn't expecting any storms this morning. :lightning:

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Very suprised by how a lot of the convection fizzled. Looks like a lot of heating from Ohio down through S IL and into Kentucky. Looks like we might be seeing quite the wind threat when alot of these congeals later on IMBY.

yea looks like we have a weak cluster of showers and tstorms that may move thru in the next hour or so, (probably associated with the warm front). Once that's outta here focus turns to later afternoon evening. Looking like the leading edge of anything organized hits here around 6-7pm.

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Near Term update from IND:

THE MAIN FOCUS FOR TODAY CONTINUES TO BE THE SEVERE WEATHER

THREAT. PARAMETERS ARE BECOMING MORE FAVORABLE FOR DANGEROUS

STORMS AND TORNADOES...AND SPC WILL BE EXPANDING THE HIGH RISK

FURTHER NORTH. AS A RESULT...STRESSED THREAT FOR TORNADOES...

DAMAGING WINDS...AND LARGE HAIL IN ALL PRODUCTS.

SEVERE STORMS ARE CURRENTLY MOVING ACROSS THE NORTHERN HALF OF

FORECAST AREA...AND ENVIRONMENT WILL CONTINUE TO DESTABILIZE

THROUGH COURSE OF THE DAY. SO...INCREASED POP CHANCES TO DEFINITE

OVER THE MAJORITY OF FORECAST AREA.

THERE COULD BE A SHORT LULL IN CONVECTION AFTER THE CURRENT

STORMS...BUT THE THREAT WILL INCREASE ONCE AGAIN THIS AFTERNOON AS

INSTABILITY INCREASES. SHEAR WILL INCREASE AND A MID-LEVEL JET

WILL MOVE INTO THE AREA LATE THIS AFTERNOON. SPC SREF MODEL SHOWS

BEST INGREDIENTS FOR SEVERE WEATHER WILL MOVE INTO OUR AREA LATER

THIS AFTERNOON AND INTO THE EVENING.

MAV STILL LOOKS REASONABLE FOR HIGHS TODAY GIVEN ALL OF THE ABOVE.

NO CHANGES MADE TO TODAY/S HIGHS AT THIS TIME.

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Sort of a dumb question here, but does anyone know where I can find observed soundings for LMK (Louisville)? I can't read them to save my life, but my friend can and he's interested in seeing what our cap looks like at the moment.

What I do know, is that it's clear and sunny in Frankfort right now. I sort of figured that I'd wake up to rain.

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Near Term update from IND:

THE MAIN FOCUS FOR TODAY CONTINUES TO BE THE SEVERE WEATHER

THREAT. PARAMETERS ARE BECOMING MORE FAVORABLE FOR DANGEROUS

STORMS AND TORNADOES...AND SPC WILL BE EXPANDING THE HIGH RISK

FURTHER NORTH. AS A RESULT...STRESSED THREAT FOR TORNADOES...

DAMAGING WINDS...AND LARGE HAIL IN ALL PRODUCTS.

SEVERE STORMS ARE CURRENTLY MOVING ACROSS THE NORTHERN HALF OF

FORECAST AREA...AND ENVIRONMENT WILL CONTINUE TO DESTABILIZE

THROUGH COURSE OF THE DAY. SO...INCREASED POP CHANCES TO DEFINITE

OVER THE MAJORITY OF FORECAST AREA.

THERE COULD BE A SHORT LULL IN CONVECTION AFTER THE CURRENT

STORMS...BUT THE THREAT WILL INCREASE ONCE AGAIN THIS AFTERNOON AS

INSTABILITY INCREASES. SHEAR WILL INCREASE AND A MID-LEVEL JET

WILL MOVE INTO THE AREA LATE THIS AFTERNOON. SPC SREF MODEL SHOWS

BEST INGREDIENTS FOR SEVERE WEATHER WILL MOVE INTO OUR AREA LATER

THIS AFTERNOON AND INTO THE EVENING.

MAV STILL LOOKS REASONABLE FOR HIGHS TODAY GIVEN ALL OF THE ABOVE.

NO CHANGES MADE TO TODAY/S HIGHS AT THIS TIME.

That means we could also eek out a moderate risk up here.

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24nk6e9.gif

MESOSCALE DISCUSSION 0952

NWS STORM PREDICTION CENTER NORMAN OK

0954 AM CDT WED MAY 25 2011

AREAS AFFECTED...WRN AND SRN MO...WRN AND NRN AR

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 251454Z - 251630Z

STORM INITIATION IS EXPECTED TO OCCUR OVER THE NEXT FEW HOURS IN WRN

MO AND WRN AR. AS THE STORMS INTENSIFY...SEVERE THUNDERSTORM

DEVELOPMENT WILL BE LIKELY. INITIALLY LARGE HAIL AND WIND DAMAGE

WILL BE THE PRIMARY THREATS BUT AS THE STORMS MATURE...A TORNADO

THREAT WILL ALSO BECOME LIKELY. WW ISSUANCE SHOULD BECOME NECESSARY

ACROSS THE REGION LATE THIS MORNING AS CONFIDENCE INCREASES

CONCERNING THE EXACT TIMING OF STORM INITIATION.

THE LATEST SFC ANALYSIS SHOWS A 995 MB LOW OVER ERN KS WITH A BROAD

WARM SECTOR EXTENDING EWD ACROSS THE SRN HALF OF MO AND ACROSS ALL

OF AR INTO MS AND WRN TN. A WEAK CAPPING INVERSION IS ANALYZED

ACROSS MUCH OF THE WARM SECTOR BUT THE CAP SHOULD DIMINISH QUICKLY

AS SFC TEMPS WARM ALLOWING FOR CONVECTIVE INITIATION. SHORT-TERM

MODEL FORECASTS INITIATE SCATTERED THUNDERSTORMS ACROSS SW MO AND

WRN AR AROUND 17Z...SPREADING THIS ACTIVITY ENEWD ACROSS SE MO AND

NE AR BY EARLY AFTERNOON. STRONG DEEP LAYER SHEAR ASSOCIATED WITH A

65 TO 75 KT MID-LEVEL JET EJECTION ACROSS THE WARM SECTOR WILL

PROVIDE CONDITIONS FAVORABLE FOR INTENSE SUPERCELL DEVELOPMENT.

INITIALLY...A LARGE HAIL AND WIND DAMAGE THREAT WILL EXIST BUT AS

THE STORMS MOVE INTO A 50 TO 60 KT LOW-LEVEL JET...A THREAT FOR

TORNADOES WILL ALSO DEVELOP. FORECAST SOUNDINGS ACROSS THE ERN PART

OF THE MCD AREA BY 18Z TO 21Z SHOW 0-3 KM STORM RELATIVE HELICITIES

IN THE 350 TO 450 M2/S2 RANGE SUGGESTING STRONG TORNADOES WILL BE

POSSIBLE THIS AFTERNOON.

..BROYLES.. 05/25/2011

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