SWOMCD
SPC MCD 201256
CAZ000-201600-
MESOSCALE DISCUSSION 0324
NWS STORM PREDICTION CENTER NORMAN OK
0756 AM CDT TUE APR 20 2010
AREAS AFFECTED...PARTS OF THE NRN/CNTRL SIERRA
CONCERNING...HEAVY SNOW
VALID 201256Z - 201600Z
INCREASING SNOW RATES AND LOWERING SNOW LEVELS ALONG THE SIERRA
NEVADA WEST OF LAKE TAHOE THROUGH THE YOSEMITE AREA ARE EXPECTED
THROUGH MIDDAY.
AS A LARGE COLD UPPER TROUGH CONTINUES TO DIG INTO CALIFORNIA THIS
MORNING...LARGE-SCALE MID/UPPER FORCING FOR UPWARD VERTICAL MOTION
AND OROGRAPHIC LIFT ARE CONTRIBUTING TO INCREASING PRECIPITATION
RATES ACROSS THE NORTHERN AND CENTRAL SIERRA NEVADA. MID/LOWER
TROPOSPHERIC COLD ADVECTION APPEARS LIKELY TO LOWER SNOW LEVELS TO
AROUND OR BELOW 4000 FEET AGL BY THE 16-19Z TIME FRAME...WHEN SNOW
RATES MAY BECOME MAXIMIZED WITHIN FRONTAL BAND NEAR OR NORTHWEST OF
YOSEMITE NATIONAL PARK. FAIRLY HIGH PRECIPITABLE WATER CONTENT
AROUND .9 INCH ADVECTING INTO THIS REGION COULD SUPPORT RATES ON THE
ORDER OF 2 INCHES PER HOUR.
..KERR.. 04/20/2010
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...REV...HNX...STO...
LAT...LON 38872019 38651989 37901918 37491904 37131971 38012046
39022055 38872019
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