Tuesday, September 21, 2010

MESO: Mesoscale Discussion 1871

ACUS11 KWNS 211803
SWOMCD
SPC MCD 211802
ILZ000-WIZ000-IAZ000-MOZ000-211930-

MESOSCALE DISCUSSION 1871
NWS STORM PREDICTION CENTER NORMAN OK
0102 PM CDT TUE SEP 21 2010

AREAS AFFECTED...SOUTHERN/EASTERN IA AND NORTHERN MO TO NORTHERN
IL/FAR SOUTHERN WI

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 211802Z - 211930Z

SEVERE POTENTIAL WILL LIKELY INCREASE THROUGH EARLY/MID AFTERNOON
ACROSS SOUTHERN/EASTERN PORTIONS OF IA AND NORTHERN MO TO NORTHERN
IL/PERHAPS FAR SOUTHERN WI. A WATCH APPEARS LIKELY FOR PORTIONS OF
THE REGION.

AHEAD OF A COLD FRONT...A COMPLEX OF STORMS HAVE GRADUALLY INCREASED
IN ORGANIZATION/VIGOR ACROSS PORTIONS OF SOUTH-CENTRAL/EAST-CENTRAL
IA EARLY THIS AFTERNOON...AS THE DOWNSTREAM AIRMASS CONTINUES TO
HEAT THROUGH THE LOWER 80S F AMID RELATIVELY CLOUD FREE SKIES.
OBSERVATIONAL TRENDS/SHORT TERM FORECAST GUIDANCE WOULD SUGGEST THAT
THE STORMS WILL CONTINUE TO GRADUALLY GROW UPSCALE/FORWARD PROPAGATE
AND ACCELERATE WITHIN A STRONG/NEARLY UNIDIRECTIONAL FLOW REGIME. AS
SUCH...DAMAGING WINDS WILL BE THE PRIMARY CONCERN ESPECIALLY WITH
THE LIKELIHOOD OF BOWING SEGMENTS...WITH SEVERE HAIL POSSIBLE AS
WELL.

..GUYER.. 09/21/2010

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

ATTN...WFO...LOT...ILX...MKX...LSX...DVN...DMX...EAX...

LAT...LON 41969172 42738909 41898871 40619008 40039359 40609394
41969172

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