Winter Weather Warnings / Watches / Advisories
Issued by NWS Missoula, MT

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WWUS45 KMSO 192220
WSWMSO

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
320 PM MST FRI DEC 19 2014

...ATMOSPHERIC RIVER TO BRING HEAVY MOUNTAIN SNOW...

.AN ATMOSPHERIC RIVER WILL BRING A LOT OF MOISTURE TO THE NORTHERN
ROCKIES SATURDAY NIGHT AND SUNDAY. A LOT OF UNCERTAINTY REMAINS IN
THE SNOW LEVELS, HENCE THE WATCH INSTEAD OF ADVISORIES OR
WARNINGS. DUE TO THE HIGH PRECIPITATION RATES EXPECTED WITH THIS
EVENT, AN ERROR OF A FEW HOURS IN THE TIMING OF THE RISING SNOW
LEVELS WILL LEAD TO A BIG DIFFERENCE IN THE ACTUAL SNOWFALL. THE
WATCHES WILL BE TRANSITIONED TO WARNINGS OR ADVISORIES AS
WARRANTED WHEN CONFIDENCE IN THE SNOW LEVEL FORECAST INCREASES.

IDZ005-006-010-MTZ002-004-006-007-043-210100-
/O.NEW.KMSO.WS.A.0012.141221T0100Z-141222T1200Z/
NORTHERN CLEARWATER MOUNTAINS-SOUTHERN CLEARWATER MOUNTAINS-
EASTERN LEMHI COUNTY-WEST GLACIER REGION-LOWER CLARK FORK REGION-
BITTERROOT/SAPPHIRE MOUNTAINS-BUTTE/BLACKFOOT REGION-
POTOMAC/SEELEY LAKE REGION-
320 PM MST FRI DEC 19 2014

...WINTER STORM WATCH IN EFFECT FROM SATURDAY EVENING THROUGH
LATE SUNDAY NIGHT...

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A WINTER
STORM WATCH...WHICH IS IN EFFECT FROM SATURDAY EVENING THROUGH
LATE SUNDAY NIGHT.

* IMPACTS/TIMING: POTENTIAL FOR HEAVY WET SNOW TO IMPACT AREA
  PASSES SATURDAY NIGHT THROUGH SUNDAY. HEAVY SNOW FOLLOWED BY
  RAIN COULD MAKE MOUNTAIN ROADS VERY DIFFICULT OR DANGEROUS TO
  TRAVEL ON AT TIMES. LOOKOUT, LOLO, AND LOST TRAIL PASSES WILL
  MOST LIKELY BE IMPACTED, WITH IMPACTS ALSO POSSIBLE AT
  HOMESTAKE, MCDONALD, AND MARIAS PASSES. MANY HIGHER ELEVATION
  LOCATIONS SUCH AS ELK CITY, DIXIE, AND GILMORE SUMMIT IN CENTRAL
  IDAHO, AND GEORGETOWN LAKE AND SEELEY LAKE IN MONTANA COULD
  RECEIVE SEVERAL INCHES OF SNOW ALSO.

* SNOW ACCUMULATIONS: LOOKOUT, LOLO, AND LOST TRAIL PASSES WILL BE
  MOST IMPACTED WITH POTENTIAL SNOW ACCUMULATIONS 6 - 12 INCHES IN
  24 HOURS. HOMESTAKE, MCDONALD, AND MARIAS PASSES COULD
  POTENTIALLY HAVE 2 - 8 INCHES IN 24 HOURS.

* LOCATIONS IMPACTED INCLUDE...DIXIE...ELK CITY...BANNOCK PASS...
   HIGHWAY 28 TENDOY TO LONE PINE...HIGHWAY 93 LOST TRAIL PASS
  TO GIBBONSVILLE...LEMHI PASS...BAD ROCK CANYON...ESSEX...
  HIGHWAY 83 BIGFORK TO SWAN LAKE...MARIAS PASS...POLEBRIDGE...
  EVARO HILL... I-90 LOOKOUT PASS TO HAUGAN...HIGHWAY 93 SULA TO
  LOST TRAIL PASS...LOLO PASS...BUTTE...GEORGETOWN LAKE...
  HIGHWAY 12 GARRISON TO ELLISTON...HOMESTAKE PASS...MACDONALD
  PASS...HIGHWAY 83 SEELEY LAKE TO CONDON...I-90 EAST MISSOULA
  TO BEARMOUTH

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW...SLEET...OR ICE ACCUMULATIONS THAT MAY IMPACT TRAVEL.
CONTINUE TO MONITOR THE LATEST FORECASTS.

&&

$$


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