Casper, WY

... A major change to colder and unsettled weather is expected for
the second half of the week...

A strong cold front will blast east across the area on Tuesday
bringing widespread showers and isolated thunderstorms to the
northern mountains with gradually lowering snow levels. Strong wind
will develop along the southern wind corridor with borderline high
wind in some areas.

By early Friday... the potential for a significant storm system will
start to take shape for areas east of The Divide. Widespread
moderate to locally heavy rain may develop over the central basins
with heavy wet snow in the nearby foothills and mountains. Some
light to locally moderate snow will continue in Yellowstone National
Park... the absarokas and bighorns also. Cold Valley rain and
mountain snow will continue across the northern mountains... including
Yellowstone National Park through Saturday.

Memorial Day looks much drier with more seasonable temperatures.

Travelers and those with outdoor plans should monitor the latest
forecasts from the National Weather Service on this expected major
change to colder and unsettled weather beginning in the northwest
Tuesday and spreading across all of the area for the second half of
the week into the Memorial Day weekend. Significant snowfall may
accumulate in the central and northern mountains during this
timeframe. The latest forecast can be found at
www.Weather.Gov/Riverton.

245 PM MDT Mon may 21 2012

... A major change to colder and unsettled weather is expected for
the second half of the week...

A strong cold front will blast east across the area on Tuesday
bringing widespread showers and isolated thunderstorms to the
northern mountains with gradually lowering snow levels. This cold
front is just the first in a series of storm systems expected to
impact the area into the Memorial Day weekend. A major storm system
may take shape Friday into Friday night as a large low pressure
system strengthens over the Great Basin leading to widespread valley
rain and mountain snowfall... especially across central Wyoming.

The northern mountains... including Yellowstone National Park... will
be most impacted initially as some snow will develop over the
higher peaks Tuesday and lower to near the valley floor across the
northwest Tuesday night. It will remain cool and unsettled in the
northern mountains Wednesday through Thursday with periods of light
rain at the lowest elevations with some occasional light snow in
the mountains. Some heavier snow is possible in the northwest
mountains Thursday afternoon through Thursday night.

By early Friday... the potential for a significant storm system will
start to take shape for areas east of The Divide. Widespread
moderate to locally heavy rain may develop over the central basins
with heavy wet snow in the nearby foothills and mountains. Some
light to locally moderate snow will continue in Yellowstone National
Park... the absarokas and bighorns also.

The storm system is then expected to gradually lift northward into
Montana Saturday into Sunday. Cold Valley rain and mountain snow will
continue across the northern mountains... including Yellowstone
National Park through Saturday. Temperatures will start to recover on
Sunday in the northern mountains but it will still remain quite
unsettled in Yellowstone National Park on Sunday with light valley
rain and higher elevation snow showers.

Memorial Day looks much drier with more seasonable temperatures.

Travellers and those with outdoor plans should monitor the latest
forecasts from the National Weather Service on this expected major
change to colder and unsettled weather beginning in the northwest
Tuesday and spreading across all of the area for the second half of
the week into the Memorial Day weekend. Significant snowfall may
accumulate in the central and northern mountains during this
timeframe. The latest forecast can be found at
www.Weather.Gov/Riverton.

... Red flag warning remains in effect from 11 am this morning to
8 PM MDT this evening for wind and low relative humidity for fire
weather zone 280...

* affected area... fire weather zone 280.

* Winds... southwest to west at 25 to 35 mph with gusts up to 50
mph.

* Relative humidity... 13 to 16 percent.

* Impacts... the combination of strong and gusty winds and low
relative humidity as well as critically dry fuels will result in
enhanced fire behavior during the afternoon today.

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 explosive fire growth potential.


Berc


Http://weather.Gov/Riverton

... Record high temperature set at Rock Springs this afternoon...

High pressure over the cowboy state brought warmer temperatures to
southern Wyoming this afternoon.

A record high temperature of 83 degrees was set at Rock Springs
today. This breaks the old record of 80 that was set back in 2006.