SWOMCD
SPC MCD 081807
ILZ000-MOZ000-082200-
MESOSCALE DISCUSSION 2187
NWS STORM PREDICTION CENTER NORMAN OK
1207 PM CST SAT DEC 08 2007
AREAS AFFECTED...CENTRAL IL...NORTHEAST MO
CONCERNING...FREEZING RAIN
VALID 081807Z - 082200Z
AREA OF FREEZING RAIN WITH HOURLY RATES APPROACHING 0.10 INCHES PER
HOUR IS EXPECTED TO SPREAD FROM NERN PORTIONS OF MO ACROSS CENTRAL
IL THROUGH 00Z THIS EVENING...ALONG AND NORTH OF AN AXIS FROM COU TO
SPI TO CMI.
25-30KT SOUTHWESTERLY LOW LEVEL JET OVER AR WILL AID MOISTURE
TRANSPORT ACROSS SUB-FREEZING AIR MASS FROM ERN MO INTO IL THIS
AFTERNOON. STRONGER LIFT WILL OCCUR WITHIN WEST-TO-EAST BAROCLINIC
ZONE SITUATED ACROSS THE AREA. ANOMALOUSLY HIGH UPSTREAM PW VALUES
AROUND 1 INCH SHOULD RESULT IN AREAS OF MDT FREEZING RAIN WITH
HOURLY RATES AROUND 0.10 INCHES POSSIBLE. CONWAY MO PROFILER WINDS
HAVE INCREASED FROM THE SOUTHWEST TO 30 KT AT THE 1.5 KM AGL LEVEL
WITH THE RUC SUGGESTING LLJ WILL FURTHER STRENGTHEN TO 35 KTS BEFORE
DIMINISHING IN INTENSITY AFTER 00Z. COU REPORTED 0.08 INCHES OF
FREEZING RAIN ACCUMULATION BETWEEN 16-17Z IN DEVELOPING
PRECIPITATION SHIELD AND EXPECT THESE HOURLY AMOUNTS TO EXPAND AND
SPREAD NWD OVER THE NEXT FEW HOURS.
.SCHNEIDER/CARBIN.. 12/08/2007
..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...LOT...ILX...LSX...DVN...EAX...
40218807 39698839 39458889 39288975 39179048 39029112
38839183 38669236 38859287 39329261 39799199 40089155
40479093 40739019 40828932 40548840
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