[MCD] SWOMCD

Wed Jan 18 09:37:13 UTC 2006

ACUS11 KWNS 180937
SWOMCD
SPC MCD 180937 
UTZ000-WYZ000-IDZ000-181530-

MESOSCALE DISCUSSION 0069
NWS STORM PREDICTION CENTER NORMAN OK
0337 AM CST WED JAN 18 2006

AREAS AFFECTED...HIGHLANDS OF ERN ID...WRN WY MOUNTAINS AND THE
WASATCH RANGE IN UT

CONCERNING...HEAVY SNOW 

VALID 180937Z - 181530Z

LOCALLY HEAVY SNOWFALL WILL DEVELOP THROUGH THE MORNING HOURS ACROSS
THE HIGHLANDS OF ERN ID...THE WRN WY MOUNTAINS AND THE WASATCH RANGE
IN UT NORTH OF ABOUT I-80.  LOCAL SNOWFALL RATES COULD APPROACH
1.5-2 INCHES PER HOUR IN THE HIGHER ELEVATIONS.

IR-SATL SHOWS RAPIDLY COOLING CLOUD TOPS ACROSS A SWATH FROM NRN NV
INTO SRN ID....ALONG AN E-W ORIENTED H7 BAROCLINIC ZONE.  A STRONG
UPPER LEVEL JET WAS TRANSLATING QUICKLY EWD ALONG THE BASE OF THE
CA/ORE TROUGH...WITH A CORRESPONDING INCREASE IN ASCENT.  RESULTANT
ENHANCED H7-H5 FRONTOGENETIC FORCING WAS LIKELY THE MAIN IMPETUS FOR
THE INCREASING PCPN RATES.

PCPN RATES WILL LIKELY CONTINUE INCREASING THROUGH THE MORNING HOURS
AS STRONGER MOIST WLY FLOW DEVELOPS AND THE BAROCLINIC ZONE BEGINS
TO SINK SWD INTO THE NRN GREAT BASIN.  RAWS SITES SUGGEST THAT THE
09Z SNOW LEVELS...RANGING FROM 5000 FEET IN ERN ID/TETONS TO 7000
FEET IN THE UT WASATCH RANGE...WILL BEGIN TO DECREASE. BY
MID-DAY...SNOW LEVELS IN THE HEAVIEST PCPN WILL RANGE FROM 3500 FEET
IN THE HIGHLANDS OF ERN ID AND THE TETONS TO 5000 FEET IN THE
WASATCH RANGE NORTH OF I-80.

..RACY.. 01/18/2006

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

ATTN...WFO...RIW...SLC...PIH...

42021074 41521072 41101125 40751178 40881184 40951186
41371191 41531178 41851179 42171180 42381189 42361225
42421252 42811244 43071196 43491161 44001082 42911065 

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