Quantitative Precipitation Forecast
Issued by NWS

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FOUS11 KWBC 221926
QPFHSD

PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
325 PM EDT FRI SEP 22 2017

VALID 00Z SAT SEP 23 2017 - 00Z TUE SEP 26 2017


DAYS 1-3...

INTER-MOUNTAIN WEST

AN AMPLIFIED AND ANOMALOUS UPPER TROUGH OVER THE WEST WILL MOVE
SLOWLY EAST THROUGH THE REGION BEFORE GRADUALLY EJECTING AND
LIFTING NORTH AND EAST INTO THE UPPER PLAINS/MIDWEST ON MON. THE
RESULTANT GIVEN THE VERY LOW HEIGHTS AND ENHANCED LIFT WILL BE
MODERATE TO HEAVY SNOWFALL ACROSS PARTS OF THE INTER-MOUNTAIN
WEST. THE INITIAL LARGE CLOSED 500MB CIRCULATION WILL SPLIT IN TWO
RATHER QUICKLY WITH THE NORTHERN TIER LOW SHEARING OFF TO THE
NORTH AND EAST THIS EVENING INTO SATURDAY. THIS SHOULD GIVE WAY
THEN TO AN ASSORTMENT OF SHORT WAVE DYNAMICS TO GATHER IN THE BASE
OF THE TROUGH AND CONSOLIDATE, BEFORE PROGRESSING DOWNSTREAM
THROUGH THE FOUR CORNERS REGION INTO THE CENTRAL ROCKIES AND OUT
INTO THE PLAINS. A COMPREHENSIVE BLEND OF THE GUIDANCE SUGGESTS
THE HEAVIEST SNOWFALL OVER THE NEXT THREE DAYS OCCURRING ACROSS WY
AND UT, MAINLY TO THE FAVORED TERRAIN (WASATCH/UINTAS/WIND
RIVER/ABSAROKA/BIG HORN AND NORTHERN CO ROCKIES).


THE PROBABILITY OF SIGNIFICANT ICING IS LESS THAN 10 PERCENT.

MUSHER

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