SWOMCD
SPC MCD 071107
CAZ000-071400-
MESOSCALE DISCUSSION 2206
NWS STORM PREDICTION CENTER NORMAN OK
0507 AM CST MON DEC 07 2009
AREAS AFFECTED...PARTS OF THE SIERRA NEVADA
CONCERNING...HEAVY SNOW
VALID 071107Z - 071400Z
SUSTAINED HEAVY SNOW IS EXPECTED TO CONTINUE DEVELOPING ACROSS THE
SIERRA NEVADA...MAINLY WEST THROUGH SOUTH OF LAKE TAHOE THIS
MORNING.
A STRONG UPWARD VERTICAL MOTION FIELD...DYNAMICALLY FORCED...AND
SUBSTANTIALLY ENHANCED BY FAVORABLE OROGRAPHY...IS IN THE PROCESS OF
GRADUALLY DEVELOPING SOUTHWARD ALONG THE WESTERN SLOPES OF THE
NORTHERN SIERRA NEVADA. THIS IS OCCURRING IN RESPONSE TO A VIGOROUS
SHORT WAVE IMPULSE...PIVOTING AROUND THE SOUTHWESTERN PERIPHERY OF A
LINGERING CIRCULATION OVER THE NORTHERN INTERMOUNTAIN REGION. THE
UPPER FEATURE IS PROGGED TO DIG ACROSS MUCH OF NORTHERN AND CENTRAL
CALIFORNIA BY LATE MORNING...WITH STRONGEST LIFT BECOMING FOCUSED
SOUTHWEST OF LAKE TAHOE THROUGH THE YOSEMITE/MAMMOTH LAKES AREA BY
14-15Z...CONTINUING THROUGH 18Z AND BEYOND.
COINCIDENT WITH COOLING THERMODYNAMIC PROFILES AND PRECIPITABLE
WATER INCREASES TO AROUND .5 TO .6+ INCHES...LOWERING SNOW LEVELS
AND INTENSIFYING SNOW RATES ARE EXPECTED DURING THE NEXT FEW HOURS.
AVERAGE SNOW RATES...GENERALLY ABOVE 4000 FEET...MAY EXCEED 2 INCHES
PER HOUR FOR SEVERAL HOURS THIS MORNING...WITH PERHAPS 1 INCH PER
HOUR RATES AS LOW AS 1000 TO 2000 FEET NORTHEAST THROUGH EAST OF
SACRAMENTO.
..KERR.. 12/07/2009
...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...REV...HNX...STO...
LAT...LON 38772053 38541974 38321939 37761918 37291959 37792026
38072066 38432066 38772053
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