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Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Riverton WY
1255 PM MDT Wed Mar 21 2018

Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Big Horn Basin-Southwest Big Horn Basin-
Southeast Big Horn Basin-Owl Creek and Bridger Mountains-
Bighorn Mountains West-Bighorn Mountains Southeast-
Northeast Johnson County-Southeast Johnson County-
Teton and Gros Ventre Mountains-Jackson Hole-
Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
1255 PM MDT Wed Mar 21 2018

...Winter Weather Advisory for Many Mountains West of the
Continental Divide Mainly Above 8000 feet...

This Hazardous Weather Outlook is for Western and Central

.DAY ONE...Rest of Today and Tonight.

Accumulating snow is expected in the western mountains today and
tonight and in the western valleys tonight.

.DAYS TWO THROUGH SEVEN...Thursday through Wednesday.

Moderate to locally heavy rain showers are possible below 8000
feet in western Wyoming on Thursday, which will elevate flooding
potential through Friday. Moderate to heavy snow expected in the
western mountains above 8000 feet Thursday and Thursday night.

Saturday...A strong cold front will likely bring periods of
moderate to heavy snow across the west, and strong winds east of
the Continental Divide.

Sunday into Monday...A chance of snow for much of Central

.SPOTTER INFORMATION STATEMENT...Spotters are encouraged to report
any snowfall amounts. Thank you.


Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1028 AM MDT Wed Mar 21 2018

Jackson County Below 9000 Feet-
West Jackson and West Grand Counties Above 9000 Feet-
Grand and Summit Counties Below 9000 Feet-
South and East Jackson/Larimer/North and Northeast Grand/
Northwest Boulder Counties Above 9000 Feet-
South and Southeast Grand/West Central and Southwest Boulder/
Gilpin/Clear Creek/Summit/North and West Park Counties Above
9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet-
Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear
Creek/Northeast Park Counties Below 9000 Feet-
Central and Southeast Park County-
Larimer County Below 6000 Feet/Northwest Weld County-
Boulder And Jefferson Counties Below 6000 Feet/West Broomfield
North Douglas County Below 6000 Feet/Denver/West Adams and
Arapahoe Counties/East Broomfield County-
Elbert/Central and East Douglas Counties Above 6000 Feet-
Northeast Weld County-Central and South Weld County-Morgan County-
Central and East Adams and Arapahoe Counties-
North and Northeast Elbert County Below 6000 Feet/North Lincoln
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
1028 AM MDT Wed Mar 21 2018

This hazardous weather outlook is for northeast and north central

.DAY ONE...Today and Tonight

The gradual warming trend will continue today as a flat ridge of
high pressure builds over the Central Rockies. A few light snow
showers will still occur in the mountains mainly north of the
I-70 Corridor, but only a dusting of snow is expected.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Mountain areas will see a mix of rain and snow Friday as an upper
level weather disturbance moves through an upper ridge in place
over the state. On the plains, it will be very warm Thursday and
Friday with low humidities raising Fire Danger levels on the
eastern end of the Palmer Divide. After dry conditions on
Saturday, more moisture will begin moving into the mountains on
Sunday. Unsettled weather is expected through the first half of
next week as moist southerly flow will be in place across


Spotter activation will not be needed today or tonight.


Hazardous Weather Outlook
National Weather Service Salt Lake City UT
552 AM MDT Wed Mar 21 2018

Cache Valley/Utah Portion-Northern Wasatch Front-
Salt Lake and Tooele Valleys-Southern Wasatch Front-
Great Salt Lake Desert and Mountains-Wasatch Mountain Valleys-
Wasatch Mountains I-80 North-Wasatch Mountains South of I-80-
Western Uinta Mountains-Wasatch Plateau/Book Cliffs-
Western Uinta Basin-Castle Country-San Rafael Swell-
Sanpete/Sevier Valleys-West Central Utah-Southwest Utah-
Utahs Dixie and Zion National Park-South Central Utah-
Glen Canyon Recreation Area/Lake Powell-Central Mountains-
Southern Mountains-Southwest Wyoming-
552 AM MDT Wed Mar 21 2018

This Hazardous Weather Outlook is for the western two thirds of
Utah and southwest Wyoming.

.DAY ONE...Today and Tonight

A couple of weak weather disturbances will bring light valley rain
and mountain snow to northern Utah and southwest Wyoming today.
Across southern and central Utah mainly isolated mountain showers
will be the extent of any precipitation today.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

A cold front advancing toward the outlook area through Nevada
along with increasing southwest flow aloft will lead to strong
southerly winds across western Utah Thursday. Hazardous travel
conditions are expected due to the strong winds.

An exceptionally moist air mass will work into the area from the
southwest for Thursday and Friday. Widespread valley rain and high
elevation snow will develop by Thursday afternoon, and continue
through early Friday. Significant accumulations of snow are
possible across the northern mountains. Valley locations will
see substantial amounts of rain, particularly across northern Utah
and extreme southwest Utah. Rivers across southwest Utah will
experience significant rises, with flood prone areas such as slot
canyons possibly seeing flash flooding.

After a generally dry Friday afternoon and night, The main storm
system off the Pacific Northwest coast will turn east and impact
the northern half of the outlook area over the weekend. The colder
air associated with this feature will bring lower snow levels to
the north, with a few of the higher valleys and mountains
receiving accumulating snows. Precipitation will shift south into
southern and central Utah early next week.


Weather spotters are encouraged to report significant weather
conditions according to standard operating procedures.


For more information from NOAA/s National Weather Service visit...

For information on potential road travel impacts visit...

Hazardous Weather Outlook
National Weather Service GRAND JUNCTION CO
441 AM MDT Wed Mar 21 2018

Lower Yampa River Basin-Central Yampa River Basin-
Roan and Tavaputs Plateaus-Elkhead and Park Mountains-
Upper Yampa River Basin-Grand Valley-Debeque to Silt Corridor-
Central Colorado River Basin-Grand and Battlement Mesas-
Gore and Elk Mountains/Central Mountain Valleys-
Central Gunnison and Uncompahgre River Basin-
West Elk and Sawatch Mountains-Flat Tops-
Upper Gunnison River Valley-Uncompahgre Plateau and Dallas Divide-
Northwest San Juan Mountains-Southwest San Juan Mountains-
Paradox Valley/Lower Dolores River-
Four Corners/Upper Dolores River-Animas River Basin-
San Juan River Basin-Southeast Utah-Eastern Uinta Mountains-
Eastern Uinta Basin-Tavaputs Plateau-Arches/Grand Flat-
La Sal and Abajo Mountains-Canyonlands/Natural Bridges-
441 AM MDT Wed Mar 21 2018

This hazardous weather outlook is for eastern Utah and western

.DAY ONE...Today and Tonight

Snow will linger across Colorado`s northern and central mountains
today and tonight bringing an additional 1 to 2 inches of snow to
some areas.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

The next chance for significant accumulating snow arrives Thursday
and could potentially bring prolonged periods of rain and snow
to the area well into Friday. Mild temperatures and vestigial
moisture from the atmospheric river event impacting southern
California could result in prolonged periods of rainfall over
snow covered mountain areas. This could present localized drainage
issues for some areas.


Spotter activation will not be needed.


U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
Page last modified: June 2, 2009
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