SWOMCD
SPC MCD 212347
IDZ000-ORZ000-220345-
MESOSCALE DISCUSSION 2501
NWS STORM PREDICTION CENTER NORMAN OK
0547 PM CST SUN DEC 21 2008
AREAS AFFECTED...CNTRL/SWRN ID
CONCERNING...HEAVY SNOW
VALID 212347Z - 220345Z
HEAVY SNOWFALL RATES WILL DEVELOP...PRIMARILY AFTER 03Z WITH HOURLY
RATES OF 2-3 INCHES. HEAVIEST RATES WILL OCCUR ALONG WINDWARD SIDES
OF THE OWYHEE...BOISE AND SAWTOOTH RANGES.
WARM CONVEYOR DERIVED SNOW HAS BEEN MOVING EWD ACROSS NRN NV AND ID
THIS AFTN...LIKELY ENHANCED BY A WEAKENING LEAD MID-LVL WAVE THAT
ARRIVED ONSHORE THE PAC NW EARLY THIS MORNING. THIS CONVEYOR SHOULD
SHIFT EWD BY EARLY EVENING. HOWEVER...A STRONG UPR LOW CENTERED
SEVERAL HUNDRED MILES NW OF ORE/WA WAS DIGGING QUICKLY SEWD AND
SHOULD REACH THE CST LATER TONIGHT. PCPN HAS BEEN INCREASING
DOWNSTREAM BOTH ALONG THE ASSOCD OCFNT AND WITHIN THE STRENGTHENING
UPR DIVERGENCE ACROSS WRN/CNTRL ORE. THIS SHOULD QUICKLY DEVELOP EWD
THIS EVENING INTO MUCH OF THE NRN INTERMOUNTAIN W.
TIME-HEIGHT CROSS-SECTIONS SUGGEST THAT THE STRONGEST LARGE SCALE
ASCENT/UPSLOPE FLOW WILL OCCUR AFTER 03Z AS SWLY H7 WINDS INCREASE
TO OVER 45 KTS. ORIENTATION OF THE OWYHEE...SAWTOOTH AND BOISE
MOUNTAIN RANGES WITH RESPECT TO THE FLOW SHOULD BE FAVORABLE FOR THE
HEAVIEST SNOWFALL RATES OF 2-3 INCHES PER HOUR. IN THE LWR VLYS
INVOF BOISE...CALDWELL...ONTARIO AND MOUNTAIN HOME...SNOWFALL MAY
BRIEFLY REACH 1 INCH PER HOUR AROUND 06Z...BUT RATES SHOULD REMAIN
MUCH LESS THAN IN THE ADJACENT MOUNTAINS.
..RACY.. 12/21/2008
...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...PIH...BOI...
LAT...LON 44941521 44031385 43401371 42111432 42151584 42151659
42691700 43951733 45041666 44941521
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