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From: interwarn@xxxxxxxx Date: December 18, 2008 7:47:57 PM GMT-05:00 To: interwarn@xxxxxxxx Subject: Mesoscale Discussion Reply-To: interwarn@xxxxxxxx ACUS11 KWNS 190046 SWOMCD SPC MCD 190046 INZ000-ILZ000-IAZ000-MOZ000-KSZ000-NEZ000-190645- MESOSCALE DISCUSSION 2484 NWS STORM PREDICTION CENTER NORMAN OK 0646 PM CST THU DEC 18 2008 AREAS AFFECTED...SERN NEB...NERN KS...NRN MO...CNTRL/SRN IA...MUCH OF CNTRL IL INTO NWRN IND CONCERNING...WINTER MIXED PRECIPITATION VALID 190046Z - 190645Z AN INTENSIFYING WINTER STORM WILL BRING SIGNIFICANT ICING AS WELL AS HEAVY SLEET THROUGH THE EVENING FROM NEB/KS EWD ACROSS MO/IL INTO IND. THE MOST DANGEROUS CONDITIONS WILL EXIST ACROSS NRN MO...SRN IA...AND CNTRL IL WITH ICING RATES OF 0.10-0.25 IN/HR POSSIBLE. WINTER PRECIPITATION CONTINUES TO RAPIDLY EXPAND ACROSS THE CNTRL PLAINS AND MO VALLEY AHEAD OF A POTENT UPPER SHORTWAVE TROUGH. 00Z SURFACE ANALYSIS SHOWED THE FREEZING LINE EXTENDING FROM CNTRL KS EWD TO JUST S OF KANSAS CITY...COLUMBIA MO AND INTO ST LOUIS. PRECIPITATION RATES WILL CONTINUE TO INCREASE GENERALLY ALONG AND N OF THE SFC FREEZING LINE AS IT SHIFTS NWD TO AN FNB TO UIN LINE BY 06Z. STRONG...DEEP SYNOPTIC SCALE LIFT AS WELL AS LOW LEVEL ISENTROPIC LIFT/FRONTOGENESIS ON THE NOSE OF AN INTENSIFYING LOW LEVEL JET WILL COMBINE WITH ELEVATED CONVECTIVE INSTABILITY TO PRODUCE BURSTS OF THUNDERSLEET AND FREEZING RAIN WITH THUNDER. 00Z TOP SOUNDING SHOWED OVER 300 J/KG MUCAPE ROOTED AROUND 850 MB SUGGESTING EVEN SOME SMALL HAIL IS POSSIBLE. THE LARGEST QPF AMOUNTS SHOULD OCCUR ACROSS SRN IA...NRN MO...INTO CNTRL IL WHERE RATES OF 0.25 IN/HR ARE LIKELY AT TIMES. .JEWELL.. 12/19/2008 ..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...IWX...IND...LOT...ILX...LSX...DVN...DMX...EAX... FSD...OAX...TOP...GID... LAT...LON 41149774 42079622 42419397 42529182 42088930 41438702 40828605 40198582 39858653 39518757 39448830 39408956 39289063 39329454 38999562 39019640 39199747 39669845 40309818 41149774
Illiana Skywarn - Serving the Wabash Valley since 1974 Participate or Listen on: 145.230 (- / no PL) Vigo, Edgar, Clark, Vermillion, Parke, Clay and Sullivan 146.715 (- / no PL) overflow for Vermillion and Parke 444.600 (+ / no PL) UHF link into 145.230/r 146.685 (- / 151.4Hz) as a backup