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MESOSCALE DISCUSSION 0281
NWS STORM PREDICTION CENTER NORMAN OK
0632 PM CDT THU MAR 26 2009
AREAS AFFECTED...MUCH OF CO...NERN NM...WRN KS...TX/OK PANHANDLES
CONCERNING...BLIZZARD
VALID 262332Z - 270330Z
HEAVY SNOW WILL CONTINUE TO GRADUALLY BUILD SWD AND EWD THROUGH THE
NIGHT. RATES OF 1 TO 2 INCHES AN HOUR ARE LIKELY...WITH RATES NEAR 3
INCHES OVER HIGHER TERRAIN. STRONG NLY/NELY WINDS WILL CAUSE
CONSIDERABLE RESTRICTIONS IN VISIBILITY IN BLOWING SNOW.
BLIZZARD CONDITIONS HAVE ALREADY COMMENCED ACROSS MUCH OF CO. RECENT
OBSERVATIONS REFLECT ONGOING BLIZZARD WITH SIGNIFICANT RATES OF
ACCUMULATION IN ADDITION TO WIND GUSTS UP TO 50 MPH. IMPRESSIVE
SURFACE PRESSURE RISES HAVE BEEN NOTED ACROSS MUCH OF CO FOLLOWING A
STRONG COLD FRONTAL PASSAGE...AND EXPECT THIS TREND TO CONTINUE TO
PROGRESS SWD AND EWD THROUGH THE NIGHT AS THE VIGOROUS UPPER LOW
DRIFTS SWD. VERY STRONG UPPER DIVERGENCE WILL AID IN VERTICAL MOTION
IN AN ENVIRONMENT ALREADY CONDUCIVE TO HEAVY SNOWFALL. MOISTURE FROM
THE SYSTEM TO THE EAST CONTINUES TO BE DRAWN INTO THE SYSTEM...AND
STRONG WARM ADVECTION...NOTED ON VAD WIND PROFILE DATA...ATOP A
SUBFREEZING ARCTIC AIRMASS AT THE SURFACE CONTRIBUTE TO RATES OF
ACCUMULATION. ADDITIONALLY...FORECAST SOUNDINGS TOWARDS 06Z SUGGEST
RATES MAY BECOME CONVECTIVELY ENHANCED...ESPECIALLY NEAR NERN NM AND
THE TX/OK PANHANDLES WHERE WEAK ELEVATED INSTABILITY WILL EXIST.
..HURLBUT.. 03/26/2009
ATTN...WFO...DDC...GLD...AMA...PUB...BOU...ABQ...
LAT...LON 36430163 35770328 36260486 37180580 38240591 38870468
38490217 37820151 36880142 36430163
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