MESO: Mesoscale Discussion 0013

ACUS11 KWNS 050604
SWOMCD
SPC MCD 050604
IDZ000-MTZ000-ORZ000-WAZ000-051000-

MESOSCALE DISCUSSION 0013
NWS STORM PREDICTION CENTER NORMAN OK
1204 AM CST MON JAN 05 2009

AREAS AFFECTED...PARTS OF WA...NERN ORE AND W-CENTRAL/NRN ID

CONCERNING...HEAVY SNOW

VALID 050604Z - 051000Z

HEAVY SNOWFALL RATES OF 1 TO 2 INCHES/HR ARE LIKELY AT TIMES THROUGH
12Z OVER PARTS OF WA...NERN ORE AND AFTER 09Z OVER W-CENTRAL/NRN ID.

06Z REGIONAL RADAR MOSAIC INDICATES PRECIPITATION HAS BEGUN TO
OVERSPREAD MUCH OF ERN WA. SURFACE OBSERVATIONS WITHIN THE PAST
HOUR AT SEA AND EPH ARE REPORTING HEAVY AND MODERATE SNOW
RESPECTIVELY. THIS HEAVY SNOW REGIME WILL LIKELY CONTINUE EWD AS
STRONG LOW LEVEL WARM ADVECTION IMPLIED BY 00Z/05 UIL RAOB AND AREA
VWP/S WILL CONTINUE TO PUSH INTO INTERIOR WA/ORE. DESPITE INITIAL
RELATIVELY DRY LOW LEVELS OVER ERN LOCALES...FORECAST SOUNDINGS
INDICATE TOP-DOWN MOISTENING WILL OCCUR RAPIDLY WITH TIME...LEADING
TO A DEEP /AOA 400MB/ SATURATED COLUMN. THIS WILL BE FAVORABLY
TIMED WITH STRONG UVV/S OVERSPREADING THE REGION FROM THE W.
ADDITIONAL LIFT DUE TO OROGRAPHIC CONTRIBUTIONS ON SW FACING SLOPES
SHOULD ACT TO ENHANCE PRECIPITATION RATES FURTHER. LATEST
DETERMINISTIC/ENSEMBLE QPF SUGGEST OCCASIONAL SNOW RATES OF 1 TO 2
INCHES/HR WILL BE COMMON. SNOWFALL RATES OVER MUCH OF WA ARE
EXPECTED TO WANE FROM W TO E TOWARDS THE END OF THE PERIOD AND AREAS
WILL PROBABLY BEGIN TO CHANGE RAIN IN WRN AREAS AS TEMPS WARM
TOWARDS 12Z.

..SMITH.. 01/05/2009

...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...PIH...MSO...BOI...OTX...PDT...SEW...PQR...

LAT...LON 46691461 45231395 43541494 43391648 45071788 47551916
47372044 46112131 46042222 48982261 48912041 48661666
46691461

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