SWOMCD
SPC MCD 191156
CAZ000-191600-
MESOSCALE DISCUSSION 0011
NWS STORM PREDICTION CENTER NORMAN OK
0556 AM CST TUE JAN 19 2010
AREAS AFFECTED...MOUNTAINS OF NRN CA...INCLUDING THE COASTAL RANGE
AND NRN SIERRA
CONCERNING...HEAVY SNOW
VALID 191156Z - 191600Z
SNOWFALL RATES UP TO 2 IN/HR ARE LIKELY BY MID TO LATE MORNING
ACROSS THE MOUNTAINS OF NRN CA...INCLUDING THE COASTAL RANGE AND NRN
SIERRA. SNOW LEVELS SHOULD REMAIN AROUND 4500 FEET THROUGH 18Z.
THE NEXT IN A SERIES OF PACIFIC TROUGHS WILL AFFECT CA TODAY. EARLY
MORNING LIGHTNING DATA INDICATED ABUNDANT STRIKES EMBEDDED WITHIN
THE WARM CONVEYOR BELT OF THIS SYSTEM...NOW AFFECTING THE OFFSHORE
AND COASTAL AREAS OF NRN CA. THE EXTENSIVE LIGHTNING COVERAGE IS
INDICATIVE OF THE STRONG FORCING FOR ASCENT ATTENDANT TO THIS
TROUGH...WITH SHORT TERM MODELS SHOWING THIS ASCENT SPREADING ACROSS
NRN CA THIS MORNING. DESPITE AN EXPECTED INCREASE IN S/SWLY LOW-MID
LEVEL WINDS THAT WOULD NORMALLY RESULT IN SOMEWHAT HIGHER SNOW
LEVELS...THE STRONG DYNAMIC FORCING WITH THIS SYSTEM IS EXPECTED TO
MAINTAIN A COLDER COLUMN. THUS...CURRENT SNOW LEVELS AROUND 4500
FEET SHOULD TEND TO REMAIN UNCHANGED THROUGH 18Z.
..PETERS.. 01/19/2010
...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...REV...MFR...STO...EKA...
LAT...LON 41292327 41562285 41552236 41602201 41512165 40592118
39582082 39732146 40682180 40932215 40472282 39442246
39272287 40042336 40552353 40882341 41292327
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