I'll preface this with the warning that when they predict BIG snowfalls they hardly ever happen...
Here's the JH forecast for the next 48 hours.MOIST NORTHWEST FLOW WILL GRADUALLY SHIFT TO THE WEST WITH INCREASING PACIFIC MOISTURE TONIGHT. WAVES OF MOISTURE WILL MOVE THROUGH THE MOUNTAINS FRIDAY FRIDAY NIGHT AND SATURDAY. WHILE THERE WILL BE BREAKS IN THE INTENSITY...A LONG DURATION SNOWFALL IS EXPECTED WITH SOME MOUNTAIN AREAS RECEIVING 20 TO 30 INCHES BEFORE THE SNOWFALL ENDS LATE SATURDAY AFTERNOON. LOCAL AMOUNTS UP TO 35 INCHES ARE POSSIBLE. THE VALLEYS CAN EXPECT 10 TO 20 INCHES.
and from NOAA:
Winter Storm Warning
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
252 PM MST THU FEB 11 2010
...LONG DURATION SNOWFALL EXPECTED IN THE WEST THROUGH SATURDAY...
.SNOWFALL ACROSS MUCH OF THE WESTERN MOUNTAINS AND VALLEYS IS
EXPECTED TO CONTINUE THROUGH SATURDAY. SNOWFALL OF 3 TO 8 INCHES
HAS ALREADY FALLEN IN THE TETONS WITH 2 TO 5 INCHES IN THE STAR
VALLEY...AND 1 TO 2 INCHES IN YELLOWSTONE NATIONAL PARK AND
JACKSON HOLE. SNOWFALL WILL GENERALLY BE LIGHT WITH PERIODS OF
MODERATE SNOWFALL THROUGH SATURDAY. SNOWFALL IN THE TETON
MOUNTAINS OF 25 TO 30 INCHES IS EXPECTED WITH 10 TO 20 INCHES
POSSIBLE IN THE STAR VALLEY AND JACKSON HOLE. SNOWFALL IN THE
WYOMING AND SALT RIVER RANGES AND ACROSS THE SOUTHERN HALF OF
YELLOWSTONE NATIONAL PARK SHOULD BE FROM 15 TO 25 INCHES.
I guess we'll see whether they have any idea what they're talking about. I just drove from SLC to Jackson late this afternoon and the roads were clear the whole way.