SWOMCD
SPC MCD 150015
CAZ000-150415-
MESOSCALE DISCUSSION 0112
NWS STORM PREDICTION CENTER NORMAN OK
0615 PM CST SAT FEB 14 2009
AREAS AFFECTED...PORTIONS OF NCENTRAL AND NWRN CA
CONCERNING...HEAVY SNOW
VALID 150015Z - 150415Z
SNOW...WITH RATES OF 1-2 IN/HR ARE POSSIBLE OVER PORTIONS OF THE
COASTAL MOUNTAINS AND CASCADE RANGE OF NCENTRAL-NWRN CA BY 03-06Z.
AT 23Z/14...A S/W TROUGH DEPICTED IN SATELLITE IMAGERY WAS LOCATED
270 NM W OF THE NRN CA COAST...AND IS FCST TO APPROACH THE REGION
DURING THE NIGHT...RESULTING IN STRENGTHENING UPPER LEVEL
DIVERGENCE/LARGE SCALE ASCENT. AS THIS HAPPENS...LOW TO MID LEVEL
FLOW WILL INCREASE SUBSTANTIALLY OUT OF THE S-SW BY 03Z...ENHANCING
WAA/ISENTROPIC UPGLIDE. THIS WILL FOCUS INCREASING PRECIPITATION
RATES OVER PORTIONS OF THE COASTAL RANGE EAST TOWARD THE CASCADES.
MODEL FORECAST AND OBSERVED SOUNDINGS INDICATE FREEZING LEVELS WILL
GENERALLY RESIDE AROUND 2500-3500 FEET. FROM THE SNOW LEVEL UP TO
4000 FT...SNOWFALL RATES WILL GRADUALLY INCREASE TOWARD 1 IN/HR
MAINLY AFTER 03Z...WITH LOCAL 2 IN/HR RATES ALONG THE WINDWARD SIDE
OF HIGHER MOUNTAINOUS TERRAIN.
..GARNER.. 02/15/2009
...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...MFR...STO...EKA...
LAT...LON 40782250 40652258 40372277 39822261 39532324 40602378
40902388 41262356 41512317 41662274 41572214 41232185
40902210 40782250
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