MESO: Mesoscale Discussion 0008

ACUS11 KWNS 050102
SWOMCD
SPC MCD 050101
WYZ000-MTZ000-IDZ000-050530-

MESOSCALE DISCUSSION 0008
NWS STORM PREDICTION CENTER NORMAN OK
0701 PM CST FRI JAN 04 2008

AREAS AFFECTED...CENTRAL/EASTERN ID MOUNTAINS TO YELLOWSTONE
VICINITY

CONCERNING...HEAVY SNOW

VALID 050101Z - 050530Z

HEAVY SNOW WILL DEVELOP EASTWARD ACROSS THE CENTRAL/EASTERN ID
MOUNTAINS TOWARD THE DIVIDE/YELLOWSTONE VICINITY THIS EVENING. ALONG
WITH STRONG GUSTY WINDS...SNOW RATES OF 2 IN/HR WILL BE POSSIBLE IN
THE HIGHER ELEVATIONS THROUGH 06Z.

ON ARCING PERIPHERY OF UPPER LOW NEARING THE WA/BRITISH COLUMBIA
COAST...EXTENSIVE MOISTURE PLUME EXTENDS FROM THE EASTERN PACIFIC
INTO THE NORTHERN INTERMOUNTAIN REGION...IMMEDIATELY AHEAD OF
OCCLUDED FRONT ADVANCING ACROSS EASTERN WA/EASTERN ORE TOWARD ID
EARLY THIS EVENING. AS INFRARED/WATER VAPOR IMAGERY AND GPS-DERIVED
PRECIP WATER DATA IMPLY...CONSIDERABLE MID LEVEL MOISTENING HAS
OCCURRED THIS AFTERNOON ACROSS ID...WITH RAOB-SAMPLED PRECIP WATER
VALUES INCREASING FROM 0.33 TO 0.55 INCHES AT BOISE BETWEEN 12Z-00Z.
LATEST MESOWEST OBSERVATIONS SUGGEST SNOW LEVELS ARE CURRENTLY
AROUND 5000 FT IN THE SAWTOOTH/CENTRAL ID MOUNTAINS. IN ACCORDANCE
WITH LATEST NAM/GFS/SREF GUIDANCE...CONSIDERABLE LARGE SCALE
ASCENT/OROGRAPHIC LIFT VIA DEEP LAYER/STRONG SOUTHWESTERLY FLOW
/ESPECIALLY INTO SOUTH-SOUTHWEST FACING SLOPES/ WILL FAVOR HIGHER
ELEVATION HEAVY SNOW THIS EVENING...LIKELY REACHING THE YELLOWSTONE
VICINITY BETWEEN 03Z-06Z. AMPLE LIFT/MOISTURE AVAILABILITY SUGGEST
THAT SNOW RATES OF 2 IN/HR WILL BE A DISTINCT POSSIBILITY
/ESPECIALLY ABOVE 6500 FT/...ALONG WITH CONSIDERABLE
BLOWING/DRIFTING SNOW.

.GUYER.. 01/05/2008

..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...RIW...TFX...PIH...MSO...BOI...

44771152 44781051 44071065 43901233 43441362 43331482
43701546 44281528 44141445 44021370 44111310 44291261

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