SWOMCD
SPC MCD 051035
CAZ000-051530-
MESOSCALE DISCUSSION 2223
NWS STORM PREDICTION CENTER NORMAN OK
0535 AM CDT WED OCT 05 2011
AREAS AFFECTED...SIERRA NEVADA MOUNTAIN RANGE - ABOVE 6000 FEET
CONCERNING...HEAVY SNOW
VALID 051035Z - 051530Z
HEAVY SNOWFALL RATES /UP TO 2 INCH PER HOUR/ ARE EXPECTED TO DEVELOP
THIS MORNING IN THE HIGHER TERRAIN NEAR AND TO THE NW-W OF TVL AND
SPREAD SWD INTO THE SRN SIERRA NEVADA MOUNTAINS. IN ADDITION TO THE
LIKELIHOOD FOR HEAVY SNOWFALL RATES...THE PASSAGE OF A PACIFIC COLD
FRONT WILL SUPPORT LOWERING SNOW LEVELS. AT 12Z THIS MORNING...
LEVELS SHOULD BE AROUND 8000 FEET ACROSS THE FULL EXTENT OF THE
DISCUSSION AREA /ERN EL DORADO COUNTY TO ERN FRESNO COUNTY/. AS THE
FRONT ADVANCES SSEWD...THE ADVECTION OF COLDER TROPOSPHERIC
TEMPERATURES WILL SUPPORT SNOW LEVELS ACROSS THE NRN SIERRA AND NRN
EXTENT OF THE SRN SIERRA REACHING AROUND 6000 FEET BY 18Z. FARTHER
S...18Z SNOW LEVELS SHOULD BE IN THE 7000-7500 FOOT RANGE...WITH
LEVELS THEN LOWERING TO 6000-6500 FEET INTO THE AFTERNOON.
TRENDS IN LATE NIGHT/EARLY MORNING RADAR/SATELLITE IMAGERY SHOWED
THE PACIFIC COLD FRONT ADVANCING ESEWD THROUGH NRN CA. THE TIMING
OF THIS FRONT ACROSS THE DISCUSSION AREA BETWEEN 12-18Z WILL RESULT
IN FAVORABLE UPSLOPE FLOW /DEEP LAYER SWLY WIND FIELDS/ INTO MUCH OF
THE SIERRA MOUNTAIN RANGE. THIS MOIST ASCENT COMBINED WITH DCVA
ATTENDANT TO A DIGGING SHORTWAVE TROUGH TRACKING TOWARD CENTRAL CA
AT THIS TIME WILL FURTHER ENHANCE UPWARD VERTICAL MOTION FOR HIGHER
PRECIPITATION RATES.
..PETERS.. 10/05/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...VEF...REV...HNX...STO...
LAT...LON 39132023 38912003 38481959 38021910 37481875 37281859
37121877 37301911 37821957 38131984 38322018 38582032
38892037 39132023
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