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Winter Weather Advisory


URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE MISSOULA MT
855 PM MST TUE JAN 27 2015

IDZ010-281500-
/O.NEW.KMSO.WW.Y.0010.150128T0355Z-150128T1500Z/
EASTERN LEMHI COUNTY-
855 PM MST TUE JAN 27 2015

...WINTER WEATHER ADVISORY IN EFFECT UNTIL 8 AM MST WEDNESDAY...

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A WINTER
WEATHER ADVISORY FOR SNOW AND LOCAL POCKETS OF FREEZING RAIN...WHICH
IS IN EFFECT UNTIL 8 AM MST WEDNESDAY.

* IMPACTS/TIMING: LIGHT SNOW HAS DEVELOPED OVER SOUTHERN LEMHI
  COUNTY, CAUSING SLICK SNOW COVERED ROADS ALONG HIGHWAY 28 SOUTH
  OF LEADORE OVER GILMORE SUMMIT. SNOW WILL CONTINUE THROUGH MUCH
  OF THE NIGHT AND GRADUALLY SPREAD NORTHWARD. THERE IS STILL
  POTENTIAL FOR A BRIEF PERIOD OF LIGHT FREEZING RAIN FOR VALLEYS
  BELOW 4500 FEET, INCLUDING SALMON.

* SNOW ACCUMULATIONS: 1-3 INCHES, MAINLY OVER GILMORE SUMMIT AND
  IN THE HIGHER TERRAIN.

* ICE ACCUMULATIONS: GENERALLY TRACE AMOUNTS.

* LOCATIONS IMPACTED INCLUDE...BANNOCK PASS...HIGHWAY 28 TENDOY
  TO LONE PINE...HIGHWAY 93 LOST TRAIL PASS TO GIBBONSVILLE...
  LEMHI PASS...SALMON

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW...SLEET...OR
FREEZING RAIN WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.

&&

$$


Special Weather Statement


SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
650 AM MST WED JAN 28 2015

WYZ004>006-281530-
NORTH BIG HORN BASIN-SOUTHEAST BIG HORN BASIN-
SOUTHWEST BIG HORN BASIN-
650 AM MST WED JAN 28 2015

TEMPERATURES HAVE WARMED TO AROUND 34 DEGREES ACROSS MUCH OF THE
EASTERN BIGHORN BASIN ENDING THE THREAT FOR LIGHT FREEZING RAIN FOR
MUCH OF THE AREA. THE MAIN EXCEPTION IS BETWEEN WORLAND AND
THERMOPOLIS...AROUND THE CITY OF KIRBY WHERE TEMPERATURES REMAIN JUST
BELOW FREEZING. SO THERE COULD BE POCKETS OF BRIEF...LIGHT FREEZING
RAIN...BUT THE MAJORITY OF THE AREA WILL SEE JUST A COLD RAIN.
MOTORISTS ARE STILL ADVISED TO BE ON THE LOOKOUT FOR BLACK ICE THIS
MORNING...ESPECIALLY BETWEEN WORLAND AND THERMOPOLIS.

$$

21

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
1227 PM MST TUE JAN 27 2015

IDZ018-019-023-025-031-032-281800-
SAWTOOTH MOUNTAINS-UPPER SNAKE HIGHLANDS-CARIBOU HIGHLANDS-
WASATCH MOUNTAINS/IDAHO PORTION-BIG AND LITTLE WOOD RIVER REGION-
LOST RIVER/PAHSIMEROI-
INCLUDING THE CITIES OF...STANLEY...CLAYTON...DRIGGS...DUBOIS...
ISLAND PARK...ST. ANTHONY...EDIE SCHOOL...DOWNEY...
LAVA HOT SPRINGS...SODA SPRINGS...WAYAN...MONTPELIER...
GEORGETOWN...PARIS...HAILEY...KETCHUM...SUN VALLEY...BELLEVUE...
CAREY...ARCO...CHALLIS...MACKAY
1227 PM MST TUE JAN 27 2015

...PERIODS OF RAIN AND SNOW SPREADING INTO THE SOUTHEAST IDAHO
MOUNTAINS TONIGHT AND CONTINUING THROUGH WEDNESDAY...

PERIODS OF RAIN AND SNOW ARE EXPECTED TONIGHT THROUGH WEDNESDAY
AFTERNOON AS A STORM SYSTEM LIFTS INTO THE REGION FROM NEVADA.
SNOW LEVELS WILL RANGE BETWEEN 5500 AND 6000 FEET MSL THIS EVENING
BEFORE GRADUALLY DECREASING LATE TONIGHT AND WEDNESDAY MORNING.
STORM TOTAL ACCUMULATIONS ARE EXPECTED TO RANGE FROM 1 TO 3 INCHES
ACROSS THE CENTRAL MOUNTAINS TO 3 TO 6 INCHES ACROSS THE EASTERN
HIGHLANDS THROUGH WEDNESDAY AFTERNOON. BY WEDNESDAY
AFTERNOON...THE STORM SYSTEM WILL BEGIN TO SHIFT EAST INTO WYOMING
WITH PARTIAL CLEARING ACROSS THE CENTRAL MOUNTAINS GRADUALLY
SPREADING INTO THE EASTERN HIGHLANDS LATE WEDNESDAY EVENING.
INDIVIDUALS PLANNING TRAVEL INTO THE EASTERN HIGHLANDS TONIGHT OR
WEDNESDAY MORNING SHOULD BE PREPARED FOR WINTER DRIVING CONDITIONS.

$$


Hazardous Weather Outlook


HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
528 AM MST WED JAN 28 2015

MTZ028>042-056>058-063>068-WYZ098-099-291230-
SOUTHERN WHEATLAND-MUSSELSHELL-TREASURE-NORTHERN ROSEBUD-CUSTER-
FALLON-NORTHERN STILLWATER-YELLOWSTONE-POWDER RIVER-CARTER-
SOUTHERN BIG HORN-EASTERN CARBON-NORTHERN PARK-
NORTHERN SWEET GRASS-GOLDEN VALLEY-RED LODGE FOOTHILLS-
NORTHERN BIG HORN-SOUTHERN ROSEBUD-JUDITH GAP-PARADISE VALLEY-
LIVINGSTON AREA-BEARTOOTH FOOTHILLS-ABSAROKA/BEARTOOTH MOUNTAINS-
CRAZY MOUNTAINS-NORTHEAST BIGHORN MOUNTAINS-SHERIDAN FOOTHILLS-
528 AM MST WED JAN 28 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
MONTANA...SOUTH CENTRAL MONTANA...SOUTHEAST MONTANA AND NORTH
CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER TODAY AND
TONIGHT IS LOW.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

AFTER A PROLONGED PERIOD OF WARM TEMPERATURES...A COLD FRONT IS
EXPECTED TO BRING TEMPERATURES IN THE 20S AND THE THREAT OF
ACCUMULATING SNOW TO THE AREA SATURDAY AND SUNDAY. BELOW NORMAL
TEMPERATURES AND ADDITIONAL CHANCES FOR SNOW MAY CONTINUE THROUGH
MUCH OF NEXT WEEK AS WELL. KEEP UP WITH THE LATEST FORECAST FOR
DETAILS ON THIS EXPECTED RETURN TO WINTER CONDITIONS.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

$$

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
525 AM MST WED JAN 28 2015

WYZ001>020-022>030-291300-
ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST-
BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS-
EAST SWEETWATER COUNTY-FLAMING GORGE-
GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS-
NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN-
NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS-
ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES-
SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN-
SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY-
TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN-
UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN-
WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST-
YELLOWSTONE NATIONAL PARK-
525 AM MST WED JAN 28 2015

...WINTER WEATHER ADVISORY IS IN EFFECT UNTIL 1100 AM FOR THE TETON
AND GROS VENTRE MOUNTAINS IN FAR WEST WYOMING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

LIGHT TO OCCASIONALLY MODERATE SNOW WILL OCCUR IN THE WEST UNTIL LATE
MORNING...ENDING EARLY IN THE AFTERNOON. EAST OF THE DIVIDE...AREAS
OF RAIN AND SNOW WILL OCCUR...ENDING FROM NORTH TO SOUTH BY
EVENING. PATCHY LIGHT FREEZING RAIN WILL BE POSSIBLE THROUGH 9 AM
ACROSS THE EASTERN BIG HORN BASIN...WHERE TEMPERATURES ARE HOVERING
AROUND FREEZING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THURSDAY...PATCHY FOG IN THE MORNING...WITH VISIBILITIES AT A FEW
LOCATIONS DECREASING TO BELOW A HALF MILE...WILL OCCUR ACROSS THE
LOWER ELEVATIONS EAST OF THE DIVIDE AS WELL A IN THE JACKSON AND STAR
VALLEYS WEST.

.SPOTTER INFORMATION STATEMENT...

SPOTTERS ARE ENCOURAGED TO REPORT SNOWFALL AMOUNTS...OR ANY ICE
ACCUMULATION.

$$

TEAM RIVERTON


Hydrologic Outlook


HYDROLOGIC OUTLOOK
MTC003-009-011-017-025-037-065-067-075-087-095-097-103-107-111-
WYC033-301200-

HYDROLOGIC OUTLOOK
NATIONAL WEATHER SERVICE BILLINGS MT
453 AM MST WED JAN 28 2015

RECORD WARM TEMPERATURES OVER THE PAST WEEK HAVE MELTED OUT LOWER
ELEVATION SNOWPACK...AND HAS BEGUN TO MELT SNOWPACK OVER AREA
FOOTHILLS BELOW 7000 FEET. THIS HAS RESULTED IN INCREASING FLOWS
ON AREA STREAMS AND RIVERS...WITH INDICATIONS OF ICE JAM FORMATION
IN SOME AREAS INCLUDING ALONG THE MUSSELSHELL AND TONGUE RIVERS.
AS WATER CONTINUES TO WORK INTO AREA WATERWAYS OVER THE NEXT FEW
DAYS THE THREAT OF ICE JAM FORMATION AND LOCALIZED FLOODING WILL
INCREASE. THOSE WITH INTERESTS NEAR WATERWAYS SHOULD BE ALERT FOR
ICE JAM FLOODING AND TAKE PRECAUTIONS NOW TO MOVE LIVESTOCK AND
EQUIPMENT TO HIGHER GROUND.

$$

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: June 2, 2009
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