515
WWUS45 KBOU 180458
WSWBOU
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE DENVER CO
1058 PM MDT SUN MAY 17 2026
COZ033-181900-
/O.UPG.KBOU.WW.Y.0018.260518T0600Z-260519T0300Z/
/O.NEW.KBOU.WS.W.0006.260518T0600Z-260519T0300Z/
SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST
GRAND/NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET-
INCLUDING THE CITIES OF LARAMIE AND MEDICINE BOW MOUNTAINS, ROCKY
MOUNTAIN NATIONAL PARK, RABBIT EARS RANGE, WILLOW CREEK PASS, AND
CAMERON PASS
1058 PM MDT SUN MAY 17 2026
..WINTER STORM WARNING IN EFFECT UNTIL 9 PM MDT MONDAY
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF 8 TO 18 INCHES.
HIGHEST AMOUNTS ON EAST FACING SLOPES.
* WHERE...ROCKY MOUNTAIN NATIONAL PARK AND THE MEDICINE BOW RANGE.
* WHEN...UNTIL 9 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE VERY DIFFICULT AND AFFECT THE MONDAY
MORNING AND EVENING COMMUTES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
IF YOU MUST TRAVEL, KEEP AN EXTRA FLASHLIGHT, FOOD, AND WATER IN YOUR
VEHICLE IN CASE OF AN EMERGENCY. THE LATEST ROAD CONDITIONS FOR
COLORADO CAN BE OBTAINED BY CALLING 5 1 1 OR BY GOING TO
WWW.COTRIP.ORG.
IF TRAVELING TO THE MOUNTAINS, BE PREPARED FOR WINTER DRIVING
CONDITIONS. CHECK COTRIP.ORG FOR ROAD CLOSURES AND TRACTION LAWS.
COZ031-181900-
/O.CON.KBOU.WW.Y.0018.260518T0600Z-260519T0300Z/
WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET-
INCLUDING THE CITIES OF MT ZIRKEL
1058 PM MDT SUN MAY 17 2026
..WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT MONDAY
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS 5 TO 14 INCHES,
HEAVIEST IN THE PARK RANGE. WINDS GUSTING AS HIGH AS 30 MPH.
* WHERE...RABBIT EARS PASS.
* WHEN...UNTIL 9 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE SLIPPERY WITH SNOW COVERED ROADS AT
TIMES, ESPECIALLY LATE TONIGHT AND DURING THE PERIODS OF HEAVIEST
SNOWFALL ON MONDAY. THE HAZARDOUS CONDITIONS MAY IMPACT THE MONDAY
MORNING AND EVENING COMMUTES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING. THE LATEST ROAD CONDITIONS
FOR COLORADO CAN BE OBTAINED BY CALLING 5 1 1 OR BY GOING TO
WWW.COTRIP.ORG.
COZ034-181900-
/O.CON.KBOU.WW.Y.0018.260518T0600Z-260519T0300Z/
SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST
BOULDER/GILPIN/CLEAR CREEK/SUMMIT/NORTH AND WEST PARK COUNTIES
ABOVE 9000 FEET-
INCLUDING THE CITIES OF INDIAN PEAKS, MOUNT BLUE SKY, EISENHOWER
TUNNEL, WILLIAMS FORK MOUNTAINS, BERTHOUD PASS, KENOSHA MOUNTAINS,
BRECKENRIDGE, WINTER PARK, EAST SLOPES SOUTHERN GORE RANGE, AND EAST
SLOPES MOSQUITO RANGE
1058 PM MDT SUN MAY 17 2026
..WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT MONDAY
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF 4 TO 12 INCHES
OVER MOST OF THE ADVISORY AREA. HOWEVER, LITTLE IF ANY ACCUMULATION
IN THE VALLEYS OF SUMMIT COUNTY WHILE THE HEAVIEST AMOUNTS OCCUR IN
THE MOUNTAINS NORTH OF I-70.
* WHERE...THE MOUNTAINS OF SUMMIT COUNTY, THE MOSQUITO RANGE, AND THE
INDIAN PEAKS.
* WHEN...UNTIL 9 PM MDT MONDAY.
* IMPACTS...TRAVEL COULD BE SLIPPERY WITH SNOW COVERED ROADS AT
TIMES, ESPECIALLY LATE TONIGHT AND DURING THE PERIODS OF HEAVIEST
SNOWFALL ON MONDAY. THE HAZARDOUS CONDITIONS MAY IMPACT THE MONDAY
MORNING AND EVENING COMMUTES.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING. THE LATEST ROAD CONDITIONS
FOR COLORADO CAN BE OBTAINED BY CALLING 5 1 1 OR BY GOING TO
WWW.COTRIP.ORG.
FOR MORE INFORMATION FROM THE NATIONAL WEATHER SERVICE, VISIT
HTTPS://WEATHER.GOV/BOU
63
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