SWOMCD
SPC MCD 051952
MTZ000-IDZ000-052345-
MESOSCALE DISCUSSION 0194
NWS STORM PREDICTION CENTER NORMAN OK
0152 PM CST THU MAR 05 2009
AREAS AFFECTED...PORTIONS OF NRN ID AND NWRN MT
CONCERNING...HEAVY SNOW
VALID 051952Z - 052345Z
SNOW SHOWERS OVER THE MOUNTAINOUS TERRAIN OF NRN ID WILL BE CAPABLE
OF PRODUCING RATES UP TO 1-2 IN/HR...WHILE FARTHER EAST OVER NWRN
MT...RATES ARE EXPECTED TO STEADILY INCREASE DURING THE MID TO LATE
AFTERNOON.
AT 19Z...SURFACE LOW PRESSURE WAS CENTERED OVER EXTREME SERN BRITISH
COLUMBIA...WITH AN ARCTIC COLD FRONT DRAPED ACROSS NORTHERN MT. AS
AN ATTENDANT UPPER LEVEL TROUGH SAGS SOUTH INTO THE REGION DURING
THE 21-00Z TIME FRAME...THE SURFACE COLD FRONT IS FORECAST TO BACK
WEST INTO WRN MT...RESULTING IN LOW LEVEL TEMPERATURES FALLING INTO
THE TEENS AND 20S /DEG F/. LARGE SCALE ASCENT WILL CONTINUE TO
INCREASE WITH THE APPROACHING TROUGH DURING THE MID TO LATE
AFTERNOON...WHILE LOW LEVEL FRONTOGENETIC FORCING REMAINS STRONG AS
CONVERGENT FLOW ACTS ON THE TIGHT ARCTIC THERMAL GRADIENT. VERTICAL
MOTION WILL BE FURTHER ENHANCED BY STEEP MID LEVEL LAPSE RATES /AOA
7.5 DEG C PER KM/...RESULTING IN CONVECTIVE SNOW SHOWERS POTENTIALLY
YIELDING RATES UP TO 1-2 IN/HR.
..GARNER.. 03/05/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TFX...MSO...OTX...
LAT...LON 48911294 48271232 47541225 46621502 46581617 47021658
47881604 49001505 49001320 48911294
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