SWOMCD
SPC MCD 252356
NEZ000-COZ000-WYZ000-260400-
MESOSCALE DISCUSSION 2273
NWS STORM PREDICTION CENTER NORMAN OK
0656 PM CDT TUE OCT 25 2011
AREAS AFFECTED...PORTIONS OF S CNTRL/SERN WY AND CNTRL CO
CONCERNING...HEAVY SNOW
VALID 252356Z - 260400Z
SNOW LEVELS WILL CONTINUE TO LOWER THIS EVENING...WITH RATES
INCREASING TO 1-2 INCH AN HOUR...ESPECIALLY ACROSS HIGHER
ELEVATIONS. GUSTY WINDS WILL SIGNIFICANTLY REDUCE VISIBILITIES AT
TIMES.
A POWERFUL PACIFIC UPPER TROUGH WILL CONTINUE TO PROGRESS EWD
OVERNIGHT...WITH A DUAL JET STRUCTURE FOCUSING ENHANCED VERTICAL
MOTION ACROSS PORTIONS OF THE ROCKIES. ONE JET WILL STRENGTHEN OVER
THE NRN INTERMOUNTAIN WEST AND NRN HIGH PLAINS...WHILE A
SEPARATE...STRONGER JET WILL STRENGTHEN ACROSS THE FOUR CORNERS
REGION INTO THE CNTRL HIGH PLAINS. DIURNAL AND DYNAMIC COOLING WILL
CONTRIBUTE TO LOWERING SNOW LEVELS...WHILE COLD AIR DAMMING EAST OF
THE FRONT RANGE WILL EVENTUALLY LEAD TO SUBFREEZING TEMPERATURES
ALONG THE LEE OF THE ROCKIES...PARTICULARLY IN NERN CO/SERN WY.
RECENT OBSERVATIONS AT LARAMIE AND CHEYENNE ARE REPORTING
SNOWFALL...INDICATING SNOW LEVELS AROUND 6-7 KFT. THE COOLER AIR
MASS WILL GRADUALLY DEVELOP SWWD. OTHER SITES CONTINUE TO REPORT
PLUMMETING TEMPERATURES...CONFIRMING LOWERING SNOW LEVELS. GIVEN
DEEP LAYER MOISTENING IN ASSOCIATION WITH A MODIFIED PACIFIC AIR
MASS IN ADDITION TO IMPLIED CONVECTIVE RATES WITH LIGHTNING RECENTLY
REPORTED OVER THE FRONT RANGE...HEAVY SNOWFALL WITH RATES NEAR 1-2
INCH AN HOUR CAN BE EXPECTED LATE TONIGHT INTO THE EARLY MORNING.
..HURLBUT.. 10/25/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PUB...BOU...CYS...GJT...
LAT...LON 41420706 42020606 41670423 40900357 39930427 39320500
39140594 39250703 39720728 41420706
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