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Dense Fog Advisory


URGENT - WEATHER MESSAGE
National Weather Service Cheyenne WY
356 AM MDT Fri May 29 2020

WYZ116-291500-
/O.NEW.KCYS.FG.Y.0008.200529T0956Z-200529T1500Z/
South Laramie Range-
Including the cities of Buford, Pumpkin Vine, and Vedauwoo
356 AM MDT Fri May 29 2020

...DENSE FOG ADVISORY IN EFFECT UNTIL 9 AM MDT THIS MORNING...

* WHAT...Dense fog reducing visibilities to under one quarter of a
  mile.

* WHERE...South Laramie Range County, including the I-80 Summit.

* WHEN...Until 9 AM MDT this morning.

* IMPACTS...Hazardous driving conditions due to low visibility.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

If driving, slow down, use your headlights, and leave plenty of
distance ahead of you.

&&

$$

Braun


Air Quality Alert


COC013-123-001-031-059-035-005-014-069-292200-
Boulder-Weld-Adams-Denver-Jefferson-Douglas-Arapahoe-
Broomfield-Larimer-
410 PM MDT Thu May 28 2020

...OZONE ACTION DAY ALERT FROM 400 PM THURSDAY UNTIL 400 PM
FRIDAY...

The Colorado Department of Public Health and Environment has
issued the following...

WHAT...Ozone Action Day Alert.

WHERE...Douglas, Jefferson, Denver, western Arapahoe, western
Adams, Broomfield, Boulder, Larimer, and Weld Counties

WHEN...400 PM Thursday May 28 to 400 PM Friday May 29

IMPACTS...Ozone Action Day Alert is now in effect for the seven-
county Denver- Boulder metropolitan area. Requests to limit
driving are now in effect until at least 4 PM Friday, May 29,
2020.  Hot and sunny weather, along with light winds, will lead to
concentrations of ozone that are Unhealthy for Sensitive Groups on
Friday. The highest concentrations of ozone are most likely for
locations in the western portions of the Denver Metro area, and
northward along the Front Range and lower foothills through
Boulder, Longmont, and western Fort Collins. For areas included in
this advisory that are not expected to exceed the Unhealthy for
Sensitive Groups (USG) air quality designation, we request that
activities, such as driving, be reduced to lessen the impacts on
neighboring air quality. Additional air pollution in this region
may directly diminish air quality or contribute to precursors
which may also adversely affect air quality. For Colorado air
quality conditions, forecasts and advisories, visit:
https://www.colorado.gov/airquality/colorado_summary.aspx

HEALTH INFORMATION...Increasing likelihood of respiratory symptoms
and breathing discomfort in active children and adults and people
with lung disease, such as asthma. Active children and adults, and
people with lung disease, such as asthma, should reduce prolonged
or heavy outdoor exertion.

$$


Hazardous Weather Outlook


Hazardous Weather Outlook
National Weather Service Salt Lake City UT
500 AM MDT Fri May 29 2020

UTZ001>016-019>021-517-518-WYZ021-301100-
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-
500 AM MDT Fri May 29 2020

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

.DAY ONE...Today and Tonight

Excessive heat continues for southwest Utah on Friday, while it
becomes quite hot across the rest of the state with daytime high
temperatures running about 20 degrees above average.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Southwesterly winds will increase Saturday, with gusts 40 to 50
mph expected Saturday across much of western Utah.

Strong winds will also support critical fire weather conditions
this weekend. The potential for widespread critical fire weather
conditions will be highest on Saturday, but the potential will
linger into Sunday and possibly Monday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed. Please relay any information
about observed severe weather to the NWS while following all
local, state, and CDC guidelines.

$$

For more information from NOAA/s National Weather Service visit...
http://weather.gov/saltlakecity

For information on potential road travel impacts visit...
http://www.udottraffic.utah.gov/roadweatherforecast.aspx

Hazardous Weather Outlook
National Weather Service Rapid City SD
450 AM MDT Fri May 29 2020

SDZ001-002-012>014-024>032-041>044-046-047-049-072>074-WYZ054>058-
071-301100-
Harding-Perkins-Butte-Northern Meade Co Plains-Ziebach-
Northern Black Hills-Northern Foot Hills-Rapid City-
Southern Foot Hills-Central Black Hills-Southern Black Hills-
Custer Co Plains-Pennington Co Plains-Haakon-Fall River-
Oglala Lakota-Jackson-Bennett-Mellette-Todd-Tripp-
Sturgis/Piedmont Foot Hills-Southern Meade Co Plains-
Hermosa Foot Hills-Northern Campbell-Southern Campbell-
Western Crook-Wyoming Black Hills-Weston-Northeastern Crook-
450 AM MDT Fri May 29 2020 /550 AM CDT Fri May 29 2020/

This Hazardous Weather Outlook is for western South Dakota and
northeastern Wyoming.

.DAY ONE...Today and Tonight

Thunderstorms will be possible tonight. A storm or two may be
strong, but severe weather is not expected.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Isolated thunderstorms will be possible this weekend, especially
over the Black Hills. Storms may be strong, but severe weather is
not expected.

Much of next week looks active with thunderstorms, some severe at
times.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

$$

Hazardous Weather Outlook
National Weather Service Cheyenne WY
433 AM MDT Fri May 29 2020

NEZ002-003-019>021-054-055-095-096-WYZ101>103-106>108-115>119-
301045-
Dawes-Box Butte-Scotts Bluff County-Banner County-Morrill-
Kimball County-Cheyenne-North Sioux-South Sioux-
Converse County Lower Elevations-Niobrara County-
North Laramie Range-
Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Laramie Valley-
South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
433 AM MDT Fri May 29 2020

This hazardous weather outlook is for portions of panhandle
Nebraska...western Nebraska...east central Wyoming and southeast
Wyoming.

.DAY ONE...TODAY AND TONIGHT

Isolated showers and thunderstorms this afternoon, mainly
centered over the South Laramie Range. Some storms could become
severe with damaging winds and hail possible.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

Daily chances for afternoon showers and thunderstorms continues
through the week. Some may become severe with damaging winds and
hail possible.

Note that forecasted temperatures in the 80s and 90s will make it
dangerous to leave pets and vulnerable family members unattended
in cars for any period of time.


.Spotter information statement...

Spotter activation will not be needed.

$$

Hazardous Weather Outlook
National Weather Service Cheyenne WY
433 AM MDT Fri May 29 2020

WYZ104-105-109>114-301045-
Ferris/Seminoe/Shirley Mountains-Shirley Basin-
Central Carbon County-North Snowy Range Foothills-
Southwest Carbon County-Sierra Madre Range-
Upper North Platte River Basin-Snowy Range-
433 AM MDT Fri May 29 2020

This hazardous weather outlook is for portions of south central
Wyoming.

.DAY ONE...TODAY AND TONIGHT

Isolated showers and thunderstorms this afternoon, mainly
centered over the South Laramie Range. Some storms could produce
microburst winds.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

Daily chances for afternoon showers and thunderstorms continues
through the week. Some may produce microburst winds.

Note that forecasted temperatures in the 80s will make it
dangerous to leave pets and vulnerable family members unattended
in cars for any period of time.

As temperatures rise over this period, will see rising water
levels along area creeks and streams. Those living in low-lying,
flood prone areas should remain alert for high water. Will also
need to be mindful that even as temperatures warm, cold water
along area waterways remains and that cold water shock has real
potential.

.Spotter information statement...

Spotter activation will not be needed.

$$

Hazardous Weather Outlook
National Weather Service Grand Junction CO
400 AM MDT Fri May 29 2020

COZ001>014-017>023-UTZ022>025-027>029-301000-
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-
400 AM MDT Fri May 29 2020

This hazardous weather outlook is for eastern Utah and western
Colorado.

.DAY ONE...Today and Tonight

Thunderstorm development will be initially be possible this
afternoon across the high terrain of eastern Utah and western
Colorado. The better coverage of storms are forecast over the
southern Colorado and northern Utah mountains. Some of the storms
may survive into adjacent valleys through the evening but be
isolated in nature. As in the past few days gusty outflow winds
will be the main threat...and could reach over 50 mph in some of
the storms or dissipating showers.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

Afternoon thunderstorm activity will likely return across higher
terrain each afternoon through early next week. Storms look to
become more widespread Saturday into Tuesday. Warming temperatures
will continue to eat at the snowpack and flows will be
increasing. However at this time no flooding is forecast.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected today or tonight, however
spotters are encouraged to report excessive wind or any observed
wind related damage to the National Weather Service in Grand
Junction.

$$

Hazardous Weather Outlook
National Weather Service Billings MT
212 AM MDT Fri May 29 2020

MTZ034-040-056-064>068-138-139-141-169>172-235-WYZ198-199-300815-
Northern Stillwater-Northern Park-Red Lodge Foothills-
Paradise Valley-Livingston Area-Beartooth Foothills-
Absaroka/Beartooth Mountains-Crazy Mountains-Southern Big Horn-
Southeastern Carbon-Northern Sweet Grass-Bighorn Canyon-
Northern Carbon-Pryor/Northern Bighorn Mountains-
Melville Foothills-Southwestern Yellowstone-
Northeast Bighorn Mountains-Sheridan Foothills-
212 AM MDT Fri May 29 2020

This Hazardous Weather Outlook is for portions of south central
Montana and north central Wyoming.

* WHAT...Strong Thunderstorms with heavy rainfall.

* WHERE...Mainly near the mountains and foothills.

* WHEN...This afternoon and evening.

* ADDITIONAL DETAILS...Storms could produce locally heavy rain and
  strong wind gusts along with small hail. Stay alert if you have
  outdoor plans late today.

* Additional CONCERNS...There is a slight risk of severe
  thunderstorms again Saturday with locally heavy rain again
  possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the sky and find safe shelter if threatening weather
approaches.

&&

$$

Hazardous Weather Outlook
National Weather Service Riverton WY
200 AM MDT Fri May 29 2020

WYZ001>020-022>030-300800-
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-
200 AM MDT Fri May 29 2020

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight.

Isolated strong thunderstorms possible, mainly in northern
Wyoming.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Saturday...Widely scattered afternoon and evening thunderstorms.
Strong to possibly severe thunderstorms are possible generally
across the Bighorn Basin, Johnson and Natrona counties.

Sunday...Elevated fire behavior possible in portions of the area
in the afternoon.

Monday...Showers and thunderstorms possible over far southern
portions late in the afternoon into the evening.

Tuesday...Showers and thunderstorms possible over eastern portions
late in the afternoon into the evening.

Wednesday...Scattered afternoon showers and thunderstorms west of
the Divide. Showers east of the Divide through the overnight
hours.

This weekend into next week...Unseasonably warm temperatures will
result in rapid mountain snowmelt. Significant rises are expected
on area creeks and rivers where ample snow remains in the
headwaters.

.SPOTTER INFORMATION STATEMENT...

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


$$

Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
1028 AM MDT Thu May 28 2020

COZ030>051-291630-
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
County-
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
County-
Southeast Elbert County Below 6000 Feet/South Lincoln County-
Logan County-Washington County-Sedgwick County-Phillips County-
1028 AM MDT Thu May 28 2020

This hazardous weather outlook is for northeast and north central
Colorado.

.DAY ONE...Today and Tonight

Scattered showers and thunderstorms will develop over the
mountains and foothills by early afternoon. This activity may then
spread into the plains late this afternoon and evening. The
stronger storms will produce brief heavy rain, small hail and
wind gusts to 40 mph.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday

There will be a chance of afternoon and evening showers and
thunderstorms over the mountains and foothills each day, with
lesser chances out on the plains. The storms are expected to be
most numerous on Saturday, when there is a threat of heavy rain.
A few strong storms are possible each day, but the threat of
severe thunderstorms is low through the extended.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated today or tonight.

$$


Hydrologic Outlook


Hydrologic Outlook
COC081-UTC009-047-031900-

Hydrologic Outlook
National Weather Service Grand Junction CO
329 PM MDT Thu May 28 2020

...Expect Increased Flows on the Green River Below Flaming Gorge
Reservoir Due to Releases...

Flaming Gorge Reservoir will increased releases from 8,100 cfs to
8,600 cfs as of 5 pm May 28, 2020. Releases will remain at 8,600
cfs until further notice.

$$

Hydrologic Outlook
WYC003-013-023-029-035-039-291230-

Hydrologic Outlook
National Weather Service Riverton WY
1228 PM MDT Thu May 28 2020

...Much higher flows along creeks and small streams will occur
this weekend into next week due to the expected near record high
temperatures...

Snowpack at the 8,000 to 10,000 foot elevation is ripe (water
laden), and will be melting quickly this weekend into next week. There
could also be showers and thunderstorms at times especially on
Saturday.

The greatest concern will be across western Wyoming where copious
amounts of snow remain in the headwaters of area creeks and rivers.
The Pacific Creek will rise to levels above action stage.

Remember, during active snowmelt runoff, mountain creeks flow the
highest during evening and overnight hours, through the early
morning. Do not attempt to cross a fast moving creek or stream at
these times as the power of water will easily carry you downstream.

$$

team riverton

Hydrologic Outlook
MTC003-009-037-065-067-095-097-107-111-WYC033-291645-

Hydrologic Outlook
National Weather Service Billings MT
1038 AM MDT Wed May 27 2020

...Rising river and stream levels next several days...

A period of much warmer temperatures will begin to melt the existing
high elevation snow pack (above 8000 feet) in the mountains late
this week into early next week. The snow melt will cause increased
flows along rivers and streams emerging from the mountains. This
includes the Yellowstone, Shields, Boulder, Stillwater, Little
Bighorn and Tongue Rivers, as well as numerous other smaller streams.

Beginning Friday, afternoon temperatures at 8000 feet will reach the
60s and 70s, and overnight temps will stay above freezing for much
of the night. Look for warmer than normal temperatures to continue
through at least the first part of next week.

Flooding is not expected at this time, but many rivers will reach
the highest levels we have seen yet this spring by the weekend.

Recreationists near the foothills should be prepared for changing
conditions and use extra caution when in and near the water. Flows
will be fast, and the water is cold. Those with interests near
waterways should move equipment and livestock away from low lying
areas.

The latest stages and forecasts for rivers and streams can be found
at our web page: http://water.weather.gov

$$

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: June 2, 2009
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