546
WWUS45 KBOU 181506
WSWBOU
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE DENVER CO
906 AM MDT MON MAY 18 2026
COZ033-182315-
/O.CON.KBOU.WS.W.0006.000000T0000Z-260519T0300Z/
SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST
GRAND/NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET-
INCLUDING THE CITIES OF WILLOW CREEK PASS, LARAMIE AND MEDICINE BOW
MOUNTAINS, CAMERON PASS, RABBIT EARS RANGE, AND ROCKY MOUNTAIN
NATIONAL PARK
906 AM MDT MON MAY 18 2026
...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
* 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 THIS EVENING.
* 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.
COZ030-035-182315-
/O.EXA.KBOU.WW.Y.0018.000000T0000Z-260519T0300Z/
JACKSON COUNTY BELOW 9000 FEET-LARIMER AND BOULDER COUNTIES
BETWEEN 6000 AND 9000 FEET-
INCLUDING THE CITIES OF WALDEN, GOULD, NORTH PARK, RAND, GLENDEVEY,
RED FEATHER LAKES, ESTES PARK, NEDERLAND, AND SPICER
906 AM MDT MON MAY 18 2026
..WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 PM MDT THIS EVENING
* WHAT...SNOW. ADDITIONAL SNOW ACCUMULATIONS UP TO 6 INCHES.
* WHERE...NORTH PARK, AND THE NORTHERN FRONT RANGE FOOTHILLS.
* WHEN...UNTIL 9 PM MDT THIS EVENING.
* IMPACTS...TRAVEL COULD BE DIFFICULT DUE TO SLICK ROADS, ESPECIALLY
DURING PERIODS OF HEAVIER SNOWFALL.
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.
COZ031-182315-
/O.CON.KBOU.WW.Y.0018.000000T0000Z-260519T0300Z/
WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET-
INCLUDING THE CITIES OF MT ZIRKEL
906 AM MDT MON MAY 18 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
* WHAT...SNOW. 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 THIS EVENING.
* IMPACTS...TRAVEL COULD BE SLIPPERY WITH SNOW COVERED ROADS AT
TIMES, ESPECIALLY DURING THE PERIODS OF HEAVIEST SNOWFALL THROUGH
EARLY AFTERNOON TODAY.
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.
COZ034-182315-
/O.CON.KBOU.WW.Y.0018.000000T0000Z-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 MOUNT BLUE SKY, INDIAN PEAKS, WILLIAMS FORK
MOUNTAINS, EAST SLOPES SOUTHERN GORE RANGE, BERTHOUD PASS, KENOSHA
MOUNTAINS, EAST SLOPES MOSQUITO RANGE, BRECKENRIDGE, EISENHOWER
TUNNEL, AND WINTER PARK
906 AM MDT MON MAY 18 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM MDT THIS
EVENING...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF 4 TO 10 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 THIS EVENING.
* IMPACTS...TRAVEL COULD BE SLIPPERY WITH SNOW COVERED ROADS AT
TIMES, ESPECIALLY DURING THE PERIOD OF HEAVIEST SNOWFALL FROM MID
MORNING THROUGH MID AFTERNOON.
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
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