[MCD] SWOMCD

[MCD at goshenarc.org]

ACUS11 KWNS 180124
SWOMCD
SPC MCD 180123 
IDZ000-WAZ000-ORZ000-180600-

MESOSCALE DISCUSSION 0109
NWS STORM PREDICTION CENTER NORMAN OK
0723 PM CST MON JAN 17 2005

AREAS AFFECTED...INTERIOR WA/NRN ID

CONCERNING...WINTER MIXED PRECIPITATION 

VALID 180123Z - 180600Z

FZRA/SOME SLEET WILL CONTINUE TO AFFECT MTN PASS AREAS OF CREST/ERN
SLOPES OF CASCADES INTO PORTIONS OF ERN WA/FAR NRN ID THROUGH
06Z...WITH POTENTIAL FOR ISOLD AREAS OF CONSIDERABLE ICE GLAZE AND
HOURLY LIQUID EQUIVALENTS OF 0.05 IN OR GREATER.

DEEP MOISTURE FETCH WILL CONTINUE TO OVERSPREAD THE PACIFIC
NORTHWEST THIS EVENING AMIDST 50-70 KT MID LEVEL WSWLY WINDS -- AS
SAMPLED IN ACARS DATA/WSR-88D VADS ACROSS WA. STRONG THETA-E
ADVECTION REGIME IN 500-700 MB LAYER WILL CONTINUE TO OVERSPREAD ERN
WA/NRN ID...INDUCING BROAD PRECIP SHIELD THIS EVENING ACROSS MUCH OF
INTERIOR WA/NRN ID...BARRING DOWNSLOPE SHADOWING IN THE COLUMBIA
BASIN. IN THE LOW LEVELS...PER LATEST SURFACE DIAGNOSTICS/MESONET
OBS...SHALLOW SUB-FREEZING ARCTIC AIRMASS LARGELY REMAINS ENTRENCHED
FROM MTN PASS AREAS/ERN SLOPES OF CASCADES ACROSS THE COLUMBIA BASIN
AND MAJORITY OF MTN AREAS OF NE WA/FAR NRN ID.

PER 00Z OTX RAOB...ELEVATED WARM LAYER /+3 DEG C/ CENTERED AROUND
800 MB HAS ALREADY SPREAD EWD THROUGH ERN WA EARLY THIS
EVENING...EVIDENCE OF FAVORABLE THERMODYNAMIC SETUP FOR FZRA WHERE
SHALLOW SUB-FREEZING TEMPS WILL PERSIST THIS EVENING. YIELDING TO
MID LEVEL WAA...RAIN SEEMINGLY ALREADY BECOMING DOMINANT PRECIP TYPE
INVOF I-90 CORRIDOR OF ECNTRL WA/NRN ID...AS EVIDENCED BY GEG AND
COE /COEUR D'ALENE ID/ SFC WET BULBS WARMING ABOVE 32F OVER PAST FEW
HOURS PRIOR TO 01Z.

..GUYER.. 01/18/2005

...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...OTX...PDT...SEW...PQR...

48722105 48312123 47512138 46842152 46432155 46012158
45732075 45832001 45971884 46081791 46941750 47711689
48171617 48921627 48961891 48971977 48962061 

WWWW