Upper Wind River Basin Severe Watches & Warnings NOAA Weather Radio

Special Statement
Statement as of 3:52 PM MDT on September 04, 2015

... Cooler weather on the way Labor Day weekend with some snow
possible in northwest Wyoming...

An area of low pressure will track across the intermountain west
Saturday and Sunday. After a warm day on Saturday... cooler
temperatures can be expected as this weather system swings a cold
front across the state Saturday night. High temperatures Sunday
will be about 10 degrees below normal... with 50s west of the
Continental Divide and 60s elsewhere. Overnight lows may dip
below freezing both Saturday night and Sunday night in the western
valleys and basins.

This weather system will also generate an increasing chance of
precipitation along and west of the Continental Divide beginning
Saturday afternoon and continuing into the early morning hours
Sunday. The timing of the precipitation Saturday night could lead
to some snow across northwest Wyoming... including much of
Yellowstone and Grand Teton National Parks. Minor snow
accumulations of 1 to 2 inches could occur above 9000 feet across
northwest Wyoming... while little or no snow accumulation is
expected below 9000 feet. The best chance of accumulating snow in
the northwest mountains... will occur with a burst of heavier
precipitation along the cold front early Saturday evening. Also
expect strong westerly winds to develop in wake of the cold front.

Conditions will be drier and slightly warmer for Labor Day. High
temperatures Monday will generally range from 65 to 75. Any
precipitation would be confined to far northwest Wyoming and the
northern Bighorn Mountains... but chances look limited.



352 PM MDT Fri Sep 4 2015

... Cooler weather on the way Labor Day weekend with some snow
possible in northwest Wyoming...

An area of low pressure will track across the intermountain west
Saturday and Sunday. After a warm day on Saturday... cooler
temperatures can be expected as this weather system swings a cold
front across the state Saturday night. High temperatures Sunday
will be about 10 degrees below normal... with 50s west of the
Continental Divide and 60s elsewhere. Overnight lows may dip
below freezing both Saturday night and Sunday night in the western
valleys and basins.

This weather system will also generate an increasing chance of
precipitation along and west of the Continental Divide beginning
Saturday afternoon and continuing into the early morning hours
Sunday. The timing of the precipitation Saturday night could lead
to some snow across northwest Wyoming... including much of
Yellowstone and Grand Teton National Parks. Minor snow
accumulations of 1 to 2 inches could occur above 9000 feet across
northwest Wyoming... while little or no snow accumulation is
expected below 9000 feet. The best chance of accumulating snow in
the northwest mountains... will occur with a burst of heavier
precipitation along the cold front early Saturday evening. Also
expect strong westerly winds to develop in wake of the cold front.

Conditions will be drier and slightly warmer for Labor Day. High
temperatures Monday will generally range from 65 to 75. Any
precipitation would be confined to far northwest Wyoming and the
northern Bighorn Mountains... but chances look limited.




Fire Weather Warning
Statement as of 9:06 PM MDT on September 04, 2015

... Red flag warning in effect from 1 PM Saturday to 9 PM MDT
Sunday for for strong wind... low humidity and critical lightning
for fire weather zones 280... 283 and 289...

The National Weather Service in Riverton has issued a red flag
warning... which is in effect from 1 PM Saturday to 9 PM MDT
Sunday. The Fire Weather Watch is no longer in effect.


* Affected area... fire weather zone 280. Fire weather zone 283.
Fire weather zone 289.

* Wind... southwest wind 15 to 25 mph with gusts 35 to 40 mph
Saturday afternoon. A cold front will shift winds west to
northwest 15 to 25 mph with gusts 30 to 35 mph Saturday
night... continuing through early Sunday evening.

* Minimum relative humidity... 12 to 15 percent Saturday afternoon.
Near 10 percent Sunday afternoon.

* Lightning... isolated to widely scattered thunderstorms possible
late Saturday afternoon and Saturday night.

* Impacts... any fires that develop will likely spread rapidly.
Outdoor burning is not recommended.

Precautionary/preparedness actions...

A red flag warning means that critical fire weather conditions
are either occurring now... or will shortly. A combination of
strong winds... low relative humidity... and warm temperatures will
create extreme fire behavior.







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