Watch/Warning Summary: September 29, 2009

US watchwarning 92909

Freeze warnings are in effect for northeastern MN, northern WI, and the western UP of MI in the Midwest.  The far northeast corner of CA and south central OR are also under a freeze warning.

Frost advisories are up for much of WI, northeastern IA, eastern MN, and far northwestern IL.  North central CA is also expected to experience some frost tonight into tomorrow morning.

Freeze watches regarding conditions for Wednesday night into Thursday morning are in effect for the Snake River plain in ID as well as parts of OR.

A winter weather advisory is in effect for northeastern NV in the Ruby Mountains and East Humboldt Range.  One to three inches of snow are expected overnight tonight into tomorrow morning.  This could affect travel along Interstate 80 in NV.

A winter storm warning is in effect for northern UT where snow is expected to fall in the Wasatch and Western Uinta Mountains.  The warning lasts through Thursday morning.  During this time, 6-12 inches of snow is expected in the area, with locally heavy amounts of 20 inches possible where the northwest winds and upslope flow maximize the snowfall.

Both the Elko, NV and Salt Lake City, UT offices cite these cold temperatures and snowfall as being unseasonable.  You can see the tightly packed isotherms (lines of equal temperature) in the Northwest below, indicating the presence of a cold front:


Click for larger image

The winter weather outlook from HPC is now up and running for the season.  They indicate a moderate chance for at least 8 inches of snow in northern UT as well as northwestern WY and southern MT with a slight chance of at least 12 inches of the white stuff in these areas.

Click for larger image

Click for larger image

Hopefully we’ll have some reports to help follow up on these events.

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