MD 1592 CONCERNING SEVERE THUNDERSTORM WATCH 518… FOR SWRN IA / SERN NEB / FAR NWRN MO / N-CNTRL KS
MESOSCALE DISCUSSION 1592
NWS STORM PREDICTION CENTER NORMAN OK
0721 PM CDT WED JUL 25 2012
AREAS AFFECTED...SWRN IA / SERN NEB / FAR NWRN MO / N-CNTRL KS
CONCERNING...SEVERE THUNDERSTORM WATCH 518...
VALID 260021Z - 260115Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 518
CONTINUES.
SUMMARY...THE SEVERE THREAT WILL LIKELY DIMINISH CONSIDERABLY S OF
THE I-80 CORRIDOR ACROSS SERN NEB AND N-CNTRL KS DUE TO SUBSTANTIAL
CONVECTIVE OVERTURNING WITHIN THE NEXT 1-2 HRS. A MORE ORGANIZED
SEVERE WIND GUST RISK WILL AFFECT AREAS GENERALLY NEAR AND N OF I-80
DURING THE EARLY EVENING HRS.
DISCUSSION...RADAR MOSAIC SHOWS NUMEROUS STORMS HAVE DEVELOPED OVER
THE PAST FEW HRS ALONG AND AHEAD OF A PRE-FRONTAL WIND SHIFT WITHIN
A HOT/DEEPLY MIXED BOUNDARY LAYER THAT EXTENDS FROM N-CNTRL KS INTO
FAR SWRN IA. WEAK DEEP LAYER SHEAR OVER THIS CORRIDOR HAS YIELDED
LITTLE IN THE WAY OF STORM ORGANIZATION...FAVORING PULSE
STRONG-SEVERE TSTMS. AS STORMS CONTINUE TO DEVELOP WITHIN AND
EXHAUST APPRECIABLE BUOYANCY IN THEIR VICINITY...THE SEVERE THREAT
WILL CORRESPONDINGLY DIMINISH...MORE RAPIDLY NEAR AND AFTER SUNSET
AS DIURNAL STABILIZATION INCREASES. AS THE FRONT ACCELERATES SWD
ACROSS THE NEB/KS BORDER REGION...THE AIRMASS OVER S-CNTRL NEB WILL
BE LESS SUPPORTIVE FOR SEVERE AND MAY BE CLEARED WITHIN THE EXISTING
WW WITHIN THE HR. FARTHER NE ACROSS SWRN IA NEAR I-80...AN
ORGANIZED SEVERE THREAT REMAINS...CONTINGENT UPON THE ONGOING SEVERE
LINEAR CLUSTER BUILDING SEWD.
..SMITH/MEAD.. 07/26/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...DMX...EAX...OAX...TOP...ICT...GID...DDC...GLD...
LAT...LON 39060005 39549810 40599659 41869545 41569487 40869483
40009554 38519802 38309986 39060005
via SPC Forecast Products http://www.spc.noaa.gov/products/md/md1592.html
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