379
WWUS75 KRIW 191535
NPWRIW
URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
935 AM MDT TUE MAY 19 2026
WYZ005-006-201400-
/O.NEW.KRIW.FZ.W.0004.260520T0300Z-260520T1400Z/
SOUTHWEST BIGHORN BASIN-SOUTHEAST BIGHORN BASIN-
INCLUDING THE CITIES OF TEN SLEEP, THERMOPOLIS, AND WORLAND
935 AM MDT TUE MAY 19 2026
...FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 8 AM MDT
WEDNESDAY...
* WHAT...SUB-FREEZING TEMPERATURES AS LOW AS 28 EXPECTED.
* WHERE...SOUTHWEST BIGHORN BASIN AND SOUTHEAST BIGHORN BASIN.
* WHEN...FROM 9 PM THIS EVENING TO 8 AM MDT WEDNESDAY.
* IMPACTS...FROST AND FREEZE CONDITIONS COULD KILL CROPS, OTHER
SENSITIVE VEGETATION AND POSSIBLY DAMAGE UNPROTECTED OUTDOOR
PLUMBING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE STEPS NOW TO PROTECT TENDER PLANTS FROM THE COLD.
WYZ011-016>020-201400-
/O.NEW.KRIW.FZ.W.0004.260520T0300Z-260520T1400Z/
SOUTHEAST JOHNSON COUNTY-UPPER WIND RIVER BASIN-WIND RIVER BASIN-
LANDER FOOTHILLS-GREEN MOUNTAINS AND RATTLESNAKE RANGE-NATRONA
COUNTY LOWER ELEVATIONS-
INCLUDING THE CITIES OF SHOSHONI, RIVERTON, LANDER, JEFFREY CITY,
DUBOIS, KAYCEE, AND CASPER
935 AM MDT TUE MAY 19 2026
...FREEZE WARNING IN EFFECT FROM 9 PM THIS EVENING TO 8 AM MDT
WEDNESDAY...
* WHAT...SUB-FREEZING TEMPERATURES BETWEEN 25 AND 30 DEGREES
EXPECTED. THE COLDEST TEMPERATURES OCCUR WHERE RECENT SNOWFALL HAS
OCCURRED, WHERE LOWS MAY REACH AS COLD AS 20 DEGREES.
* WHERE...GREEN MOUNTAINS AND RATTLESNAKE RANGE, LANDER FOOTHILLS,
NATRONA COUNTY LOWER ELEVATIONS, UPPER WIND RIVER BASIN, WIND
RIVER BASIN, AND SOUTHEAST JOHNSON COUNTY.
* WHEN...FROM 9 PM THIS EVENING TO 8 AM MDT WEDNESDAY.
* IMPACTS...FROST AND FREEZE CONDITIONS COULD KILL CROPS, OTHER
SENSITIVE VEGETATION AND POSSIBLY DAMAGE UNPROTECTED OUTDOOR
PLUMBING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE STEPS NOW TO PROTECT TENDER PLANTS FROM THE COLD.
FOR MORE INFORMATION FROM THE NATIONAL WEATHER SERVICE, VISIT
HTTPS://WEATHER.GOV/RIW/ .
WITTMANN
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