Snow Advisory 8, NWS Riverton, WY

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
204 PM MST THU FEB 15 2007

.SHORT TERM...TONIGHT THROUGH SUNDAY
LIGHT SNOW FALLING OVER THE WESTERN SECTIONS OF THE STATE AS NEXT
SYSTEM PUSHES IN FROM THE WEST. THIS STRONG PACIFIC TROUGH TO MOVE
ACROSS THE AREA TONIGHT BRINGING GOOD ISENTROPIC LIFT TO THE
WESTERN MOUNTAINS FOR A QUICK SHOT OF 3 TO 6 INCHES OVER THE AREA.
MAY SEE SOME AREAS WITH LOCALLY HIGHER AMOUNTS OF 6 TO 8 INCHES BUT
WITH ITS LOCALIZED AREAS WILL NOT ISSUE AN ADVISORY AT THIS TIME.

THE MAIN PROBLEM OVER THE AREA WILL BE THE HIGH WINDS EXPECTED
FRIDAY. WINDS TO INCREASE OVER THE FAVORED AREAS TONIGHT AS TROUGH
MOVES ACROSS THE AREA. WINDS WILL INCREASE FRIDAY MORNING TO WARNING
CRITERIA AS STRONG SUBSIDENCE OCCURS OVER THE BASINS AND MOUNTAINS
EAST OF THE DIVIDE. WILL KEEP THE WATCH GOING AND WOULD EXPECT THE
NIGHT CREW TO ISSUE THE WARNING CLOSER TO THE EXPECTED EVENT.

HIGH PRESSURE TO MOVE INTO THE AREA BY SATURDAY INTO SUNDAY WITH
DRY CONDITIONS AND WARMER TEMPERATURES. SOME AREA WILL SEE WARMER
CONDITIONS FRIDAY AS WINDS BRING DOWN WARMER AIR ALOFT. WINDS TO
DECREASE SATURDAY INTO SUNDAY WITH MOSTLY CLEAR SKIES UNTIL LATE
SUNDAY WHEN THE NEXT SYSTEM STARTS TO MOVE INTO THE EASTERN
MOUNTAINS OF IDAHO.

.LONG TERM...SUNDAY NIGHT THROUGH THURSDAY
UPPER RIDGE AXIS TO MOVE EAST OF WYOMING SUNDAY WITH TROUGH
SPLITTING ALONG THE WEST COAST.  THE NORTHERN STREAM WILL PRIMARILY
AFFECT WYOMINGS WEATHER THROUGH THIS PERIOD WITH THE SOUTHERN STREAM
STAYING WELL SOUTH OF THE AREA.  THE FIRST NORTHERN STREAM SHORTWAVE
IS FORECAST TO MOVE ACROSS THE NORTHERN ROCKIES MONDAY WITH A SECOND
SHORTWAVE TO FOLLOW ON WEDNESDAY.  THESE TWO DISTURBANCES WILL BRING
CHANCES OF VALLEY RAIN AND MOUNTAIN SNOW ACROSS THE WESTERN MOUNTAINS
AND FAR NORTH WITH BREEZY TO WINDY CONDITIONS PREVAILING ACROSS
CENTRAL AND SOUTHERN WYOMING.   AFTER THIS SECOND SHORTWAVE PASSAGE
ON WEDNESDAY...WYOMING REMAINS UNDER A MILD SOUTHWEST FLOW WITH A
TROUGH ACROSS THE EASTERN PACIFIC AND A BROAD RIDGE ACROSS THE
CENTRAL U.S. THROUGH THURSDAY.  THIS FLOW WILL CONTINUE TO BRING
CHANCES OF VALLEY RAIN AND MOUNTAIN SNOW TO THE WEST WITH BREEZY TO
WINDY AND UNSEASONABLY MILD FEBRUARY WEATHER EAST OF THE DIVIDE.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...HIGH WIND WATCH FRIDAY FOR MUCH OF
WESTERN AND CENTRAL WYOMING FOR WYOMING ZONES 02...03...15>17...
19...28>30.

&&

SHORT TERM...RIW
LONG TERM...AEM

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