[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 231808
SWOMCD
SPC MCD 231808
OHZ000-KYZ000-INZ000-ILZ000-TNZ000-MOZ000-ARZ000-232215-

MESOSCALE DISCUSSION 2510
NWS STORM PREDICTION CENTER NORMAN OK
1208 PM CST TUE DEC 23 2008

AREAS AFFECTED...NRN AR...SERN/ECNTRL MO...CNTRL/SRN IL...IN

CONCERNING...WINTER MIXED PRECIPITATION

VALID 231808Z - 232215Z

MIXED WINTER PRECIPITATION IS EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY DURING THE AFTERNOON...WITH THE POTENTIAL FOR MDT/HVY
ZR/IP EXCEEDING 0.10" PER HOUR.

AS THE LARGE WRN TROUGH IMPINGES ON THE PLAINS...A STRONG LLJ WITH
SUBSTANTIAL WAA HAS DEVELOPED FROM THE ERN PLAINS/LOWER MS VALLEY TO
THE GREAT LAKES REGION. LATEST PROFILER WINDS SHOW LLJ CORE IN
EXCESS OF 70 KTS AT H8 FROM ERN OK TO WCNTRL IL. WITH THE RESIDUAL
ARCTIC AIRMASS ALREADY IN PLACE AT THE SFC...TEMPERATURES INITIALLY
IN THE MID 20S TO LOWER 30S WILL SUPPORT AN EXTENSIVE AREA OF IP/ZR
THROUGH THE AFTERNOON. EXPECT PRECIPITATION WILL INITIALLY BEGIN AS
SNOW FROM CNTRL IL TO NRN IN...GRADUALLY CHANGING OVER TO IP/ZR BY
MID/LATE AFTERNOON.

FROM NRN AR THROUGH SERN/ECNTRL MO...SRN/CNTRL IL...AND SRN/CNTRL
IND...ZR RATES WILL EXCEED 0.05 TO 0.10" HOUR. THE WET BULB FREEZING
LINE WILL SLOWLY SHIFT NWD...REACHING ECNTRL MO/SRN IL BY 00
UTC...BUT NOT BEFORE SIGNIFICANT ZR ACCUMULATIONS OCCUR. LOCALIZED
HEAVY ZR/THUNDER ZR MAY OCCUR AS FAR NORTH AS CNTRL MO AND SRN IL
THIS AFTERNOON...AS WAA BRINGS MUCAPES NEAR 250 J/KG AND ISOLATED
THUNDERSTORMS.

..BRIGHT.. 12/23/2008

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

...NOTICE...
SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.

ATTN...WFO...ILN...LMK...IWX...IND...PAH...LOT...ILX...MEG...
LSX...LZK...SGF...TSA...

LAT...LON   36709323 37369265 38649171 39839059 40499030 40978897
            41158739 41118604 41008437 40018394 38718442 37448657
            36568904 35979081 35349250 35579349 36709323



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