Hazardous Weather Outlook
Hazardous Weather Outlook
National Weather Service Riverton WY
220 AM MDT Sat May 31 2025
WYZ001>020-022>030-011300-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Bighorn Basin-Southwest Bighorn Basin-Southeast Bighorn 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-
220 AM MDT Sat May 31 2025
This Hazardous Weather Outlook is for Western and Central Wyoming.
.DAY ONE...Today and Tonight.
Warm temperatures will bring high elevation snowmelt and rising
water levels on area creek and streams.
.DAYS TWO THROUGH SEVEN...Sunday through Friday.
Sunday...Above normal temperatures allow for mountain snowmelt
and rising water levels on creeks and streams.
Strong thunderstorms possible in northwestern Wyoming Sunday
afternoon.
Monday and Tuesday...A transition to a cooler and wetter pattern,
with snow possible in the higher elevations. Details on
precipitation amounts remain uncertain.
.SPOTTER INFORMATION STATEMENT...
Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.
$$
Hazardous Weather Outlook
National Weather Service Cheyenne WY
1225 AM MDT Sun Jun 1 2025
NEZ019>021-054-055-WYZ107-108-117>119-020630-
Scotts Bluff County-Banner County-Morrill County-Kimball County-
Cheyenne County-East Platte County-Goshen County-
South Laramie Range Foothills-Central Laramie County-
East Laramie County-
1225 AM MDT Sun Jun 1 2025
This hazardous weather outlook is for portions of panhandle
Nebraska and southeast Wyoming.
.DAY ONE...TONIGHT
Warmer temperatures and drier conditions will persist through the
weekend.
.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY
Tropical moisture will move into the area for Monday as a strong
Pacific cold front moves southeast into Wyoming. This will set the
stage for moderate to heavy rainfall and strong thunderstorms Monday
afternoon through Monday night. Cooler and wetter weather will prevail
for Tuesday and Wednesday before a warming trend develops for Thursday
through Saturday. Chances for late day showers and thunderstorms
will continue each day.
.Spotter information statement...
Spotter activation will not be needed.
$$
Hazardous Weather Outlook
National Weather Service Cheyenne WY
1225 AM MDT Sun Jun 1 2025
NEZ002-003-095-096-WYZ101>106-109>116-020630-
Dawes County-Box Butte County-Northern Sioux County-
Southern Sioux County-Converse County Lower Elevations-
Niobrara County-North Laramie Range-
Ferris/Seminoe/Shirley Mountains-Shirley Basin-
Central Laramie Range and Southwest Platte County-
Central Carbon County-North Snowy Range Foothills-
Southwest Carbon County-Sierra Madre Range-
Upper North Platte River Basin-Snowy Range-Laramie Valley-
South Laramie Range-
1225 AM MDT Sun Jun 1 2025
This hazardous weather outlook is for portions of panhandle
Nebraska...east central Wyoming...south central Wyoming and
southeast Wyoming.
.DAY ONE...TONIGHT
Warmer temperatures and drier conditions will persist through the
weekend.
.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY
Cooler and wetter weather will prevail for Tuesday and Wednesday
before a warming trend develops for Thursday through Saturday.
Chances for late day showers and thunderstorms will continue each
day.
.Spotter information statement...
Spotter activation will not be needed.
$$
Hazardous Weather Outlook
National Weather Service Denver/Boulder CO
933 AM MDT Sat May 31 2025
COZ030>051-011545-
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-
933 AM MDT Sat May 31 2025
This hazardous weather outlook is for northeast and north central
Colorado.
.DAY ONE...Today and Tonight
A few showers and thunderstorms will be possible this afternoon
across the higher elevations. Lightning and wind gusts up to 40
mph will be the main threat, but brief heavy rain and small hail
are also possible.
.DAYS TWO THROUGH SEVEN...Sunday through Friday
Scattered afternoon and evening showers and thunderstorms are
expected over the mountains again on Sunday, with just a slight
chance of storms on the plains. The threat of severe weather will
remain low. High temperatures will reach the mid to upper 80s
across most of the plains.
A weather system is expected to bring rain late Monday
into Tuesday, with snow limited to areas above 10 thousand feet.
The rain combined with snowmelt will cause elevated levels on
mountain streams. Cooler weather with scattered showers is
expected for Wednesday and Thursday.
.SPOTTER INFORMATION STATEMENT...
Spotter activation will not be needed today and tonight.
$$
Gimmestad
Hazardous Weather Outlook
National Weather Service Grand Junction CO
349 AM MDT Sat May 31 2025
COZ001>014-017>023-UTZ022>025-027>029-011000-
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-
349 AM MDT Sat May 31 2025
This Hazardous Weather Outlook is for northwest Colorado, southwest
Colorado, west central Colorado, east central Utah, northeast Utah
and southeast Utah.
.DAY ONE...Today and tonight.
Isolated afternoon showers and thunderstorms will develop over the
higher terrain today, mostly along the Divide. The primary threats
from these storms will be lightning, and gusty outflow winds 40 to 50
mph. Showers quickly diminish early this evening with quiet
conditions returning overnight.
.DAYS TWO THROUGH SEVEN...Sunday through Friday.
Isolated afternoon showers and thunderstorms continue Sunday over
the higher terrain along the Divide. Gusty winds, lightning, and
small hail can be expected with these storms. Remnants of Tropical
Storm Alvin moves up into the region Monday through midweek bringing
widespread showers, scattered thunderstorms and a possible threat of
localized flash flooding in areas prone to heavy runoff.
.SPOTTER INFORMATION STATEMENT...
Spotter activation is not expected at this time.
$$
