Mesoscale Discussion 587

Issued

Apr 26, 2012, 2:23 AM CDT (07:23 UTC)

Expired

Apr 26, 2012, 4:00 AM CDT

In force

97 min

Issued by

the Storm Prediction Center

The Evansville,IN radar (KVWX), 44 km from the middle of the area, began a volume at 07:26 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

023 
ACUS11 KWNS 260724
SWOMCD
SPC MCD 260723
KYZ000-INZ000-ILZ000-260900-

MESOSCALE DISCUSSION 0587
NWS STORM PREDICTION CENTER NORMAN OK
0223 AM CDT THU APR 26 2012

AREAS AFFECTED...SOUTHERN IL/FAR SOUTHERN INDIANA AND
WESTERN/NORTHERN KY

CONCERNING...SEVERE THUNDERSTORM WATCH 188...

VALID 260723Z - 260900Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 188
CONTINUES.

SEVERE TSTM WATCH 188 CONTINUES UNTIL 13Z. SEVERE HAIL REMAINS
POSSIBLE...BUT AN INCREASING POTENTIAL FOR AT LEAST ISOLATED
DAMAGING WINDS SEEMS LIKELY TO OCCUR THROUGH THE 08Z-10Z TIME FRAME
ACROSS EXTREME SOUTHERN INDIANA AND WEST-CENTRAL/NORTH-CENTRAL KY.
PER WFO COORDINATION...SEVERE TSTM WATCH 188 IS BEING SPATIALLY
EXTENDED EASTWARD ACROSS EAST-CENTRAL KY/ADJACENT INDIANA.

AN 80-90 MILE EXTENSIVE QUASI-LINEAR MCS CONTINUES TO MAKE A STEADY
GENERAL SOUTHEASTWARD PROGRESSION OVERNIGHT...CENTERED EITHER SIDE
OF THE CONFLUENCE OF THE WABASH/OHIO RIVERS AS OF 0715Z. GIVEN THE
PROXIMITY OF A RELATIVELY MOIST/MODERATELY UNSTABLE WESTERLY FEED
ABOVE THE SURFACE...THE STRONGEST UPDRAFTS AND THE RELATIVELY
LARGEST HAILSTONES WILL LIKELY CONTINUE TO OCCUR ON THE WESTERN
FLANK OF THE EVOLVING LINEAR CLUSTER...WITH TRAILING/MORE ISOLATED
POTENTIAL SEVERE HAIL DEVELOPMENT ALSO POSSIBLE ATOP THE LOW-LEVEL
COLD POOL.

OTHERWISE...A DEGREE OF GRADUAL UPSCALE GROWTH HAS BEEN NOTED OVER
THE PAST HOUR OR SO...WITH SOME APPARENT
INTENSIFICATION/ORGANIZATIONAL INCREASE ALONG WITH A SLOW
ACCELERATION OF FORWARD EAST-SOUTHEASTERLY MOTION /40-45 KT/. SIGNS
OF MCV DEVELOPMENT/REAR INFLOW INTENSIFICATION MAY ALREADY BE
OCCURRING NEAR THE OH RIVER...WITH DESCENDING 50+ KT WINDS RECENTLY
SAMPLED BY THE EVANSVILLE WSR-88D VWP WITHIN THE LOWEST 2-5 KM. WITH
THESE MCS-EVOLUTION ORGANIZATIONAL/INTENSIFICATION TRENDS LIKELY TO
CONTINUE...AT LEAST ISOLATED BOUTS OF DAMAGING WINDS MAY VERY WELL
BECOME MORE OF A CONCERN OVER THE NEXT FEW HOURS ACROSS EXTREME
SOUTHERN INDIANA AND MUCH OF WEST-CENTRAL/NORTH-CENTRAL KY. THE
PRIMARY NEGATING FACTOR FOR A MORE CONSEQUENTIAL WIND THREAT WILL BE
CONSIDERABLE NOCTURNALLY-AIDED CINH WITHIN THE BOUNDARY
LAYER...ALTHOUGH OBSERVATIONS REFLECT THAT SURFACE TEMPERATURES HAVE
GENERALLY REMAINED STEADY AND EVEN WARMED A FEW DEGREES IN SEVERAL
LOCATIONS OVER THE PAST 1-2 HRS ACROSS KY.

..GUYER.. 04/26/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...LMK...IND...PAH...ILX...LSX...

LAT...LON   38998913 38418800 38688683 38768549 37688465 36748574
            37258886 38998913

Mesoscale Discussions in Kentucky, 2012Mesoscale Discussions in Indiana, 2012Mesoscale Discussions in Illinois, 2012Every mesoscale discussion in 2012

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.