SWOMCD
SPC MCD 251530
ILZ000-IAZ000-NEZ000-SDZ000-252130-
MESOSCALE DISCUSSION 0298
NWS STORM PREDICTION CENTER NORMAN OK
0930 AM CST MON FEB 25 2008
AREAS AFFECTED...ERN NEB...IA...EXTREME NWRN IL
CONCERNING...WINTER MIXED PRECIPITATION
VALID 251530Z - 252130Z
FREEZING RAIN WITH RATES OF 0.05 TO 0.10 IN/HR IS LIKELY OVER
PORTIONS OF CNTRL AND ERN IA AS WELL AS FAR N WRN IL. SNOWFALL RATES
UP TO 1.00 IN/HR MAY ALSO OCCUR OVER WRN IA AND FAR ERN NEB.
SURFACE ANALYSIS SHOWED A POCKET OF SUB FREEZING AIR ACROSS CNTRL
AND E CNTRL IA...WHERE FREEZING RAIN WAS DEVELOPING. TO THE W...RAIN
WAS OCCURRING OVER ERN NEB AND WRN IA AT 15Z WHERE TEMPERATURES WERE
IN THE MID TO UPPER 30S F.
FRONTOGENETICAL FORCING GENERALLY ABOVE 700 MB WILL PERSIST OVER
CNTRL IA AND WILL MAINTAIN CURRENT ZONE OF PRECIPITATION EXTENDING
FROM ERN NEB INTO FAR NWRN IL. AS UPPER TROUGH MOVES SEWD ACROSS THE
AREA...COOLING ALOFT WILL CHANGE RAIN TO SNOW OVER ERN NEB AND WRN
IA...WITH RELATIVELY PERSISTENT FREEZING RAIN EXPECTED OVER E CNTRL
IA WHERE HRLY RATES OF UP TO 0.10 INCH MAY OCCUR. WARM NOSE ALOFT
WILL DIMINISH AND BE SHUNTED SEWD WITH TIME...WITH FREEZING RAIN
CHANGING TO ALL SNOW BETWEEN 18-21Z. LOCALLY HEAVY SNOWFALL RATES
AROUND 1 IN/HR ARE LIKELY.
.JEWELL.. 02/25/2008
..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...DVN...ARX...DMX...FSD...OAX...
42189061 41629038 41329036 41099058 41059117 41329336
41309486 41249710 41859741 42519655 43209375 42949174
42399089
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