The next in  a series of weather systems will spread snow across Western Wyoming later tonight and Sunday.  The heaviest is expected to be just north of Star Valley. Following is the Winter Storm Warning issued this Saturday afternoon.

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
121 PM MST SAT JAN 17 2015

...MORE MODERATE TO HEAVY SNOW POSSIBLE FOR THE WESTERN MOUNTAINS...

.AN PACIFIC TROUGH AND ASSOCIATED COLD FRONT WILL MOVE INTO
WESTERN WYOMING AND MAY BRING ANOTHER ROUND OF MODERATE TO
POSSIBLY HEAVY SNOW TONIGHT THROUGH EARLY MONDAY MORNING.

WYZ012-181000-
/O.UPG.KRIW.WS.A.0002.150118T0600Z-150119T1200Z/
/O.NEW.KRIW.WS.W.0002.150118T0600Z-150119T1200Z/
TETON AND GROS VENTRE MOUNTAINS-
121 PM MST SAT JAN 17 2015

...WINTER STORM WARNING IN EFFECT FROM 11 PM THIS EVENING TO 5 AM
MST MONDAY...

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A WINTER
STORM WARNING FOR HEAVY SNOW...WHICH IS IN EFFECT FROM 11 PM THIS
EVENING TO 5 AM MST MONDAY. THE WINTER STORM WATCH IS NO LONGER IN
EFFECT.

* SUMMARY AND TIMING...SNOW WILL BEGIN THIS EVENING AND BECOME
  STEADIER AND HEAVIER LATER TONIGHT INTO SUNDAY.

* SNOW ACCUMULATIONS...15 TO 20 INCHES WITH LOCALLY HIGHER
  AMOUNTS ON FAVORED WESTERN FACING SLOPES.

* WIND AND VISIBILITY...WEST TO SOUTHWEST INCREASING TO 15 TO 25
  MPH WITH GUSTS TO 35 TO 40 MPH. VISIBILITY MAY BE REDUCED TO
  UNDER ONE QUARTER MILE IN SNOW AND BLOWING SNOW.

* IMPACTS...ROADS MAY BECOME SNOW COVERED AND SNOW PACKED IN MANY
  AREAS. TRAVEL OVER TETON AND TOGWOTEE PASSES MAY BECOME
  DIFFICULT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER
CONDITIONS ARE EXPECTED OR OCCURRING.  SIGNIFICANT AMOUNTS OF
SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN
AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...
FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY.

THE LATEST ROAD CONDITIONS PROVIDED BY THE WYOMING DEPARTMENT OF
TRANSPORTATION ARE AVAILABLE BY CALLING 5-1-1 OR ON THE INTERNET
AT WYOROAD.INFO.