592
WWUS45 KMSO 171450
WSWMSO
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
850 AM MDT SUN MAY 17 2026
IDZ005-006-180600-
/O.EXB.KMSO.WW.Y.0023.260517T1500Z-260518T0600Z/
NORTHERN CLEARWATER MOUNTAINS-SOUTHERN CLEARWATER MOUNTAINS-
750 AM PDT SUN MAY 17 2026
...WINTER WEATHER ADVISORY IN EFFECT UNTIL 11 PM PDT THIS EVENING
ABOVE 5000 FEET...
* WHAT...SNOW EXPECTED ABOVE 5000 FEET. TOTAL SNOW ACCUMULATIONS UP
TO 10 INCHES ABOVE 6,000 FT, AND ACCUMULATIONS UP TO 5 INCHES ABOVE
5,000 FT.
* WHERE...DIXIE.
* WHEN...UNTIL 11 PM PDT THIS EVENING.
* IMPACTS...PLAN ON SLIPPERY BACKCOUNTRY ROAD CONDITIONS. COLD, WET
AND BREEZY CONDITIONS MAY CREATE HYPOTHERMIA RISK FOR THOSE
RECREATING IN THE BACKCOUNTRY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING ON HIGH MOUNTAIN ROADS.
PACK FULL WATERPROOF LAYERS AND THERMAL GEAR TO ENSURE YOU STAY WARM
AND DRY IF RECREATING IN THE BACKCOUNTRY.
MTZ002-043-180600-
/O.CON.KMSO.WW.Y.0023.000000T0000Z-260518T0600Z/
WEST GLACIER REGION-POTOMAC/SEELEY LAKE REGION-
850 AM MDT SUN MAY 17 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT
TONIGHT ABOVE 5000 FEET...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF 2 TO 6 INCHES IN
THE MOUNTAIN TERRAIN ABOVE 5000 FEET. ACCUMULATIONS UP TO 10
INCHES ABOVE 6,000 FT. SLUSHY ACCUMULATIONS POSSIBLE ON MARIAS
PASS.
* WHERE...THE HIGHER TERRAIN OF GLACIER NATIONAL PARK.
* WHEN...UNTIL MIDNIGHT MDT TONIGHT.
* IMPACTS...PLAN ON SLIPPERY BACKCOUNTRY ROAD CONDITIONS. COLD, WET
AND BREEZY CONDITIONS MAY CREATE HYPOTHERMIA RISK FOR THOSE
RECREATING IN THE BACKCOUNTRY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING ON HIGH MOUNTAIN ROADS.
PACK FULL WATERPROOF LAYERS AND THERMAL GEAR TO ENSURE YOU STAY WARM
AND DRY IF RECREATING IN THE BACKCOUNTRY.
MTZ006-007-180600-
/O.CON.KMSO.WW.Y.0023.000000T0000Z-260518T0600Z/
BITTERROOT/SAPPHIRE MOUNTAINS-BUTTE/BLACKFOOT REGION-
850 AM MDT SUN MAY 17 2026
...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT MDT
TONIGHT ABOVE 5000 FEET...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF 2 TO 6 INCHES IN
THE MOUNTAIN TERRAIN ABOVE 5000 FEET. ACCUMULATIONS UP TO 10 INCHES
ABOVE 6,000 FT. SLUSHY ACCUMULATIONS POSSIBLE FOR LOST TRAIL,
HOMESTAKE AND MACDONALD PASSES AND AROUND GEORGETOWN LAKE. WINDS
GUSTING AS HIGH AS 35 MPH.
* WHERE...HIGHWAY 93 SULA TO LOST TRAIL PASS, HOMESTAKE PASS,
GEORGETOWN LAKE, MACDONALD PASS, BUTTE, AND LOLO PASS.
* WHEN...UNTIL MIDNIGHT MDT TONIGHT.
* IMPACTS...PLAN ON SLIPPERY BACKCOUNTRY ROAD CONDITIONS. COLD, WET
AND BREEZY CONDITIONS MAY CREATE HYPOTHERMIA RISK FOR THOSE
RECREATING IN THE BACKCOUNTRY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SLOW DOWN AND USE CAUTION WHILE TRAVELING ON HIGH MOUNTAIN ROADS.
PACK FULL WATERPROOF LAYERS AND THERMAL GEAR TO ENSURE YOU STAY WARM
AND DRY IF RECREATING IN THE BACKCOUNTRY.
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