633
WWUS45 KMSO 151738
WSWMSO
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
1138 AM MDT FRI MAY 15 2026
MTZ002-043-180600-
/O.NEW.KMSO.WW.Y.0023.260517T0600Z-260518T0600Z/
WEST GLACIER REGION-POTOMAC/SEELEY LAKE REGION-
1138 AM MDT FRI MAY 15 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT SATURDAY NIGHT TO
MIDNIGHT MDT SUNDAY NIGHT ABOVE 5000 FEET...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF 2 TO 6 INCHES IN
THE MOUNTAIN TERRAIN ABOVE 5000 FEET. SLUSHY ACCUMULATIONS
POSSIBLE ON MARIAS PASS.
* WHERE...THE HIGHER TERRAIN OF GLACIER NATIONAL PARK.
* WHEN...FROM MIDNIGHT SATURDAY NIGHT TO MIDNIGHT MDT SUNDAY NIGHT.
* 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.NEW.KMSO.WW.Y.0023.260517T0600Z-260518T0600Z/
BITTERROOT/SAPPHIRE MOUNTAINS-BUTTE/BLACKFOOT REGION-
1138 AM MDT FRI MAY 15 2026
...WINTER WEATHER ADVISORY IN EFFECT FROM MIDNIGHT SATURDAY NIGHT TO
MIDNIGHT MDT SUNDAY NIGHT ABOVE 5000 FEET...
* WHAT...SNOW EXPECTED. TOTAL SNOW ACCUMULATIONS OF 2 TO 6 INCHES IN
THE MOUNTAIN TERRAIN ABOVE 5000 FEET. SLUSHY ACCUMULATIONS
POSSIBLE FOR LOST TRAIL, HOMESTAKE AND MACDONALD PASSES AND AROUND
GEORGETOWN LAKE. WINDS GUSTING AS HIGH AS 35 MPH.
* WHERE...HOMESTAKE PASS, LOLO PASS, GEORGETOWN LAKE, MACDONALD PASS,
HIGHWAY 93 SULA TO LOST TRAIL PASS, AND BUTTE.
* WHEN...FROM MIDNIGHT SATURDAY NIGHT TO MIDNIGHT MDT SUNDAY NIGHT.
* 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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