Nearly the entire state of Wyoming is under a Winter Weather Advisory. Up to 15” of snow if forecast for the mountains of Wyoming today and tomorrow. This storm is being called an arctic storm and will have very cold temperatures associated with it.
This is a big weather event that will leave Wyoming looking very very white.
URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE RIVERTON WY 228 AM MST WED NOV 20 2013 ...WINTER WEATHER TO IMPACT MUCH OF THE FORECAST AREA THROUGH THURSDAY MORNING... .MOIST WESTERLY FLOW WILL KEEP PERIODS OF MODERATE SNOW GOING THIS MORNING ACROSS NORTHWESTERN WYOMING. WINDS WILL ALSO BE GUSTY FOR MUCH OF THE PERIOD. AN ARCTIC FRONT WILL THEN DROP SOUTH STARTING LATE THIS AFTERNOON ACROSS NORTHERN WYOMING. AS THIS FRONT MOVES SOUTH AND EAST...IT WILL LEAD TO A SUDDEN DROP IN TEMPERATURES AS WELL AS ANOTHER ROUND OF MODERATE SNOWFALL. EVENTUALLY PERIODS OF MODERATE SNOWFALL WILL BE FOUND ACROSS THE MAJORITY OF THE FORECAST AREA THROUGH THURSDAY MORNING. SNOW WILL SLOWLY CLEAR FROM NORTHWEST TO SOUTHEAST THURSDAY AFTERNOON AND EVENING. ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST THURSDAY... * SUMMARY AND TIMING...SNOW WILL CONTINUE THIS MORNING ACROSS THE AREA. WINDS WILL ALSO BE GUSTY THROUGH TODAY LEADING TO SIGNIFICANT BLOWING AND DRIFTING SNOW...ESPECIALLY OVER THE PASSES. AN ARCTIC FRONT WILL DROP SOUTH DURING THE LATE AFTERNOON AND EARLY EVENING HOURS LEADING TO A SUDDEN DROP IN TEMPERATURES BUT WINDS WILL RELAX. ANOTHER BURST OF HEAVIER SNOW WILL OCCUR ALONG AND IMMEDIATELY BEHIND THE FRONT BEFORE CLEARING THROUGH THE MORNING ON THURSDAY. * SNOW ACCUMULATIONS...5 TO 10 INCHES WITH UP TO 15 INCHES POSSIBLE ON WEST FACING SLOPES...WITH LESS THAN 5 INCHES EXPECTED AROUND MAMMOTH. * WIND AND VISIBILITY...SOUTHWEST WINDS 15 TO 25 MPH GUSTING OVER 45 MPH ON EXPOSED RIDGES WILL LEAD TO CONSIDERABLE DRIFTING AND BLOWING SNOW WITH VISIBILITY BELOW ONE MILE AT TIMES.