490
FLUS45 KRIW 120829
HWORIW

Hazardous Weather Outlook
National Weather Service Riverton WY
229 AM MDT Mon May 12 2025

WYZ001>020-022>030-131230-
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-
229 AM MDT Mon May 12 2025

...WINTER STORM WATCH IN EFFECT FROM TUESDAY EVENING THROUGH
WEDNESDAY EVENING FOR THE ABSAROKA MOUNTAINS...

...WINTER STORM WATCH IN EFFECT FROM LATE TUESDAY NIGHT THROUGH
WEDNESDAY EVENING FOR THE BIGHORN MOUNTAINS...

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and tonight.

Fire weather conditions will be elevated and conditions
would be worse if greenup were not occurring. RH will drop into the
low teens across most of the area Monday afternoon and wind will
increase to 20-30 mph, with gusts of 30-40 mph.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Tuesday through Thursday...A multi-day Spring storm system will
impact western and central Wyoming. Substantial mountain snow will
fall at elevations above 8000 ft, mainly across the Absarokas and
Bighorns. Rainfall will be impactful as well for elevations below
8000 ft. Minor flooding is possible (20-30%) from the Absaroka
Mountains through the Bighorn Basin, over the Bighorn Mountains, and
into northern Johnson County. The best chance for minor flooding
would along the eastern slopes of the Absaroka Mountains into
northwestern Bighorn Basin.

This Weekend...Another strong Spring weather system appears likely
(70%) to be widespread precipitation chances and cool conditions to
western and central Wyoming.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

$$