SWOMCD
SPC MCD 231630
WAZ000-232030-
MESOSCALE DISCUSSION 0120
NWS STORM PREDICTION CENTER NORMAN OK
1030 AM CST WED FEB 23 2011
AREAS AFFECTED...PORTIONS OF NWRN WA INVOF THE PUGET SOUND
CONCERNING...HEAVY SNOW
VALID 231630Z - 232030Z
SNOWFALL RATES REACHING OR EXCEEDING 1" PER HOUR LOCALLY CAN BE
EXPECTED INTO THIS AFTERNOON.
LATEST RADAR IMAGERY SHOWS A CONCENTRATED AREA OF HEAVIER
PRECIPITATION OVER ERN PORTIONS OF THE STRAIT OF JUAN DE FUCA AND
FAR NRN PORTIONS OF PUGET SOUND -- WITH IR LOOP CONFIRMING THE
INCREASING ASCENT WITH SUBSTANTIAL CLOUD-TOP COOLING.
THE ASCENT IS BEING FOCUSED ON THE MESOSCALE BY A VERY SMALL LOW IN
ERN PORTIONS OF THE STRAIT...WITH A CLEAR CIRCULATION EVIDENT IN
LATEST SURFACE MESOANALYSIS ACROSS THIS AREA. AS THE LARGER-SCALE
UPPER TROUGH SHIFTS SLOWLY SWD/SSEWD...A CORRESPONDING SWD SHIFT OF
THIS MESOLOW APPEARS POSSIBLE -- WHICH SHOULD ALLOW HEAVIER SNOWFALL
RATES TO SPREAD ACROSS NRN AND INTO CENTRAL PORTIONS OF THE PUGET
SOUND OVER THE NEXT FEW HOURS. WHILE ATTM IT APPEARS THAT SNOW MAY
REMAIN NORTH OF DOWNTOWN SEATTLE OVER THE NEXT FEW HOURS...STEADIER
SNOWFALL COULD POSSIBLY REACH SEATTLE THIS AFTERNOON.
..GOSS.. 02/23/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...SEW...
LAT...LON 47852316 48032338 48262368 48662351 48652271 47942214
47552229 47512292 47852316
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