As of now (2/7/11) - the National Weather Service in Riverton has issued a Winter Weather Advisory for snow and wind, in effect until 5am Tuesday. Here's what to expect:

* SUMMARY AND TIMING...SNOW WILL DEVELOP QUICKLY LATE THIS AFTERNOON AND CONTINUE OVERNIGHT. A PERIOD OF HEAVY SNOW IS POSSIBLE FROM ABOUT 4 PM THROUGH 8 PM WHEN SNOWFALL RATES AROUND AN INCH PER HOUR ARE POSSIBLE. LIGHTER SNOW WILL FALL THE REMAINDER OF THE NIGHT.

* SNOW ACCUMULATIONS...3 TO 5 INCHES WITH THE HEAVIER AMOUNTS IN SOUTH CASPER AND IN LOCALIZED HEAVY SNOW SHOWERS.

* WIND AND VISIBILITY...NORTH WIND 10 TO 20 MPH WITH STRONGER GUSTS OVER 30 MPH IN SNOW SHOWERS. VISIBILITY WILL OCCASIONALLY BE REDUCED TO BETWEEN ONE QUARTER MILE IN HEAVIER SNOW SHOWERS LATE THIS AFTERNOON AND EARLY EVENING.

* IMPACTS...ROADS WILL BECOME SNOW PACKED AND ICY WITH POOR VISIBILITY INCREASING DRIVING HAZARDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW AND BLOWING SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING.