[MCD] SWOMCD

[MCD at goshenarc.org]

ACUS11 KWNS 301903
SWOMCD
SPC MCD 301903 
CAZ000-310000-

MESOSCALE DISCUSSION 2594
NWS STORM PREDICTION CENTER NORMAN OK
0103 PM CST THU DEC 30 2004

AREAS AFFECTED...SIERRA MTNS OF CA

CONCERNING...HEAVY SNOW 

VALID 301903Z - 310000Z

HEAVY SNOW /WITH LOCALIZED BLIZZARD CONDITIONS/ EXPECTED TO CONTINUE
INTO EARLY EVENING ACROSS MUCH OF THE SIERRA NEVADAS OF CA...WITH
SNOWFALL RATES OF 2 IN/HR POSSIBLE...ESPECIALLY ACROSS THE NRN/CNTRL
SIERRAS ABOVE 3500-4000 FT.

LATEST IR/WV IMAGERY FEATURES UPPER LOW CENTERED OFF THE OR COAST
WITH OCCLUDED/COLD FRONT PROGRESSING EWD THROUGH NRN CA. STRONG LOW
TO MID LEVEL SWLY WINDS -- E.G. 50-70 KTS AT 600 MB PER 12Z
RAOBS/RECENT ACARS DATA -- WILL CONTINUE TO INDUCE MOIST UPSLOPE
FLOW/STRONG OROGRAPHIC LIFT -- NAMELY INTO SW FACING SLOPES -- AND
HEAVY SNOW ACROSS THE SIERRAS. HEAVIEST SNOW WILL LIKELY REMAIN
FOCUSED ACROSS THE NRN/CNTRL SIERRAS OWING TO PERSISTENT MOISTURE
INFLUX AND PROXIMITY TO STEEP MID LEVEL LAPSE RATE ENVIRONMENT.

IN ACCORDANCE WITH 12Z MFR/REV/OAK RAOBS AND OBSERVED MESONET DATA
IN HIGHER TERRAIN...15Z RUC SUGGESTS SNOW LEVELS WILL REMAIN AROUND
3500 FT ACROSS THE NRN SIERRAS THROUGH 03Z. ACROSS THE CNTRL
SIERRAS...SNOW LEVELS ARE EXPECTED TO PERSIST AROUND 4000-4500
FT...WITH 4500-5000 FT IN THE SRN SIERRAS.

..GUYER.. 12/30/2004

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

...NOTICE...
SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A 
SCHEDULED BASIS...FOUR TIMES A DAY...BETWEEN 00-01 UTC...
06-07 UTC...12-13 UTC...AND 18-19 UTC AS SIGNIFICANT SHORT
RANGE WINTER WEATHER EVENTS UNFOLD.  THIS SCHEDULE WILL BE
USED FROM DECEMBER 1 THROUGH FEBRUARY 28.

ATTN...WFO...REV...HNX...STO...

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