Snow Advisory 13, NWS Riverton, WY

000 
WWUS45 KRIW 290529
WSWRIW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
1029 PM MST WED DEC 28 2005

...HEAVY SNOW WILL FALL ACROSS THE WESTERN WYOMING MOUNTAINS AND
BIGHORN MOUNTAINS TONIGHT THROUGH THURSDAY MORNING...

.A MOIST PACIFIC STORM SYSTEM WILL DRAG A COLD FRONT THROUGH
WESTERN WYOMING BRINGING PERIODS OF HEAVY SNOW TO THE TETON...
GROS VENTRE... WYOMING...SALT RIVER...BIGHORN...WEST SLOPES OF
THE WIND RIVER MOUNTAINS THROUGH TOMORROW MORNING. WESTERN
VALLEYS WILL ALSO RECEIVE ACCUMULATING SNOW THROUGH TOMORROW
MORNING. GUSTY WINDS WILL PRODUCE AREAS OF BLOWING AND DRIFTING
SNOW IN OPEN AREAS AND ALONG THE HIGHER MOUNTAIN PASSES.

WYZ012-291100-
/O.CON.KRIW.WS.W.0004.000000T0000Z-051229T1500Z/
TETON AND GROS VENTRE MOUNTAINS-
1029 PM MST WED DEC 28 2005

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 8 AM MST
THURSDAY...

A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 8 AM MST THURSDAY.

SNOW...HEAVY AT TIMES...WILL FALL THROUGH EARLY TOMORROW MORNING.
SNOWFALL AMOUNTS HAVE BEEN MEAGER THUS FAR... RANGING FROM 2 TO 4
INCHES. HOWEVER...THE SNOWFALL IS EXPECTED TO INCREASE LATER
TONIGHT WHEN SNOWFALL COULD ACCUMULATE AT OVER AN INCH AN HOUR
FOR A WHILE. TOTAL SNOWFALL OF 12 TO 15 INCHES IS LIKELY BY
THURSDAY MORNING...WITH THE HEAVIEST AMOUNTS ALONG THE WESTERN
FACING SLOPES. IN ADDITION...SOUTHWEST WINDS OF 20 TO 30 MPH WILL
ACCOMPANY THE SNOW...REDUCING VISIBILITIES AND CREATING AREAS OF
DRIFTING SNOW.

IF YOU MUST COMMUTE OVER TETON PASS TONIGHT OR TOMORROW MORNING...
BE PREPARED FOR POOR DRIVING CONDITIONS DUE TO THE SNOWFALL.
LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET
TO GET THE LATEST OBSERVATIONS AND FORECAST BEFORE TRAVELING.

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW ARE
EXPECTED OR OCCURRING. STRONG WINDS ARE ALSO POSSIBLE. THIS WILL
MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.

$$

WYZ024-291100-
/O.CON.KRIW.WS.W.0004.000000T0000Z-051229T1500Z/
SALT RIVER AND WYOMING RANGES-
1029 PM MST WED DEC 28 2005

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 8 AM MST
THURSDAY...

A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 8 AM MST THURSDAY.

SNOW...HEAVY AT TIMES...WILL CONTINUE TO FALL THROUGH EARLY
TOMORROW MORNING. SNOWFALL AMOUNTS HAVE BEEN MEAGER THUS FAR...
RANGING FROM 1 TO 3 INCHES. HOWEVER...THE SNOWFALL IS EXPECTED TO
INCREASE LATER TONIGHT. A FEW LIGHTNING STRIKES ARE ALSO POSSIBLE
AROUND AREAS OF HEAVIER SNOWFALL. SNOWFALL COULD ACCUMULATE OVER
AN INCH AN HOUR AT TIMES. TOTAL SNOWFALL OF 12 TO 15 INCHES IS
LIKELY BY THURSDAY MORNING...WITH THE HIGHEST AMOUNTS ALONG THE
WESTERN FACING SLOPES. IN ADDITION...SOUTHWEST WINDS OF 20 TO 30
MPH WILL ACCOMPANY THE SNOW...REDUCING VISIBILITIES AND CREATING
AREAS OF DRIFTING SNOW.

EXPECT ROADS WILL BECOME SLICK WITH REDUCED VISIBILITIES AT
TIMES. IF YOU MUST TRAVEL IN THIS AREA THROUGH TONIGHT... ALLOW
EXTRA TIME TO REACH YOUR DESTINATION.

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW ARE
EXPECTED OR OCCURRING. STRONG WINDS ARE ALSO POSSIBLE. THIS WILL
MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.

$$

WYZ014-291100-
/O.CON.KRIW.WS.W.0004.000000T0000Z-051229T1500Z/
WIND RIVER MOUNTAINS WEST-
1029 PM MST WED DEC 28 2005

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 8 AM MST
THURSDAY...

A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 8 AM MST THURSDAY.

SNOW...HEAVY AT TIMES...WILL FALL THROUGH EARLY TOMORROW MORNING.
SNOWFALL AMOUNTS HAVE BEEN MEAGER THUS FAR... RANGING FROM NOTHING
NEAR SOUTH PASS...TO AROUND 2 INCHES NEAR TOGWOTEE PASS. HOWEVER...THE
HEAVIER SNOWFALL IS EXPECTED LATER TONIGHT...WHEN SNOWFALL COULD
ACCUMULATE AT OVER AN INCH AN HOUR AT TIMES. TOTAL SNOWFALL OF 8
TO 14 INCHES IS LIKELY BY THURSDAY MORNING. IN ADDITION...SOUTHWEST
WINDS OF 25 TO 35 MPH WILL ACCOMPANY THE SNOW...REDUCING VISIBILITIES
AND CREATING AREAS OF DRIFTING SNOW...ESPECIALLY NEAR SOUTH PASS.

IF YOU MUST TRAVEL IN OR NEAR THE WIND RIVER MOUNTAINS THROUGH
TONIGHT...BE PREPARED FOR POOR DRIVING CONDITIONS DUE TO THE
SNOWFALL. LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON
THE INTERNET TO GET THE LATEST OBSERVATIONS AND FORECAST BEFORE
TRAVELING.

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW ARE
EXPECTED OR OCCURRING. STRONG WINDS ARE ALSO POSSIBLE. THIS WILL
MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.

$$

WYZ008-009-291100-
/O.CON.KRIW.SN.Y.0013.051229T0600Z-051229T1800Z/
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
1029 PM MST WED DEC 28 2005

...SNOW ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST THURSDAY...

A SNOW ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST THURSDAY. 

SNOW WILL DEVELOP IN THE BIGHORN MOUNTAINS AROUND MIDNIGHT AND
CONTINUE THROUGH MIDDAY THURSDAY. TOTAL SNOWFALL ACCUMULATION OF
4 TO 8 INCHES IS LIKELY. NORTHWEST WINDS OF 30 TO 40 MPH WILL
ALSO ACCOMPANY THE SNOW...SEVERELY REDUCING VISIBILITIES AND
CREATING AREAS OF DRIFTING SNOW.

A SNOW ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY
TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND
LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING.

$$

WYZ013-291100-
/O.CON.KRIW.SN.Y.0013.051229T0600Z-051229T1500Z/
JACKSON HOLE-
INCLUDING THE CITY OF...JACKSON
1029 PM MST WED DEC 28 2005

...SNOW ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST THURSDAY...

A SNOW ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST THURSDAY. 

THE MIXTURE OF RAIN AND SNOW WILL TRANSITION TO ALL SNOW ACROSS
THE JACKSON VALLEY AROUND MIDNIGHT. SNOW WILL BECOME HEAVY AT
TIMES THROUGH EARLY TOMORROW MORNING. TOTAL SNOWFALL ACCUMULATION
OF 3 TO 5 INCHES IS LIKELY BY MID MORNING ON THURSDAY.

IF TRAVEL IS PLANNED IN THE JACKSON VALLEY LATE TONIGHT THROUGH
TOMORROW MORNING...SLOW DOWN...AND ALLOW ADDITIONAL TIME TO REACH
YOUR DESTINATION.

A SNOW ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY
TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND
LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING.

$$

WYZ023-291100-
/O.CON.KRIW.SN.Y.0013.051229T0600Z-051229T1500Z/
STAR VALLEY-
INCLUDING THE CITIES OF...AFTON...ALPINE...THAYNE
1029 PM MST WED DEC 28 2005

...SNOW ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST THURSDAY...

A SNOW ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST THURSDAY. 

RAIN WILL MIX WITH AND THEN TRANSITION TO ALL SNOW ACROSS THE
STAR VALLEY LATE THIS EVENING. SNOW WILL BECOME HEAVY AT TIMES
THROUGH EARLY TOMORROW MORNING. ISOLATED LIGHTNING STRIKES ARE
POSSIBLE NEAR AREAS OF HEAVIER PRECIPITATION. TOTAL SNOWFALL
ACCUMULATION OF 2 TO 4 INCHES IS LIKELY BY MID MORNING ON
THURSDAY.

IF TRAVEL IS PLANNED IN THE STAR VALLEY LATE TONIGHT THROUGH
TOMORROW MORNING...SLOW DOWN...AND ALLOW ADDITIONAL TIME TO REACH
YOUR DESTINATION.

A SNOW ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY
TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND
LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING.

$$

WYZ025-291100-
/O.CON.KRIW.SN.Y.0013.051229T0600Z-051229T1500Z/
UPPER GREEN RIVER BASIN FOOTHILLS-
INCLUDING THE CITY OF...PINEDALE
1029 PM MST WED DEC 28 2005

...SNOW ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST THURSDAY...

A SNOW ADVISORY REMAINS IN EFFECT UNTIL 8 AM MST THURSDAY. 

LIGHT RAIN AND SNOW WILL TRANSITION TO ALL SNOW ACROSS THE UPPER
GREEN RIVER BASIN FOOTHILLS THIS EVENING. HOWEVER...AFTER MIDNIGHT...SNOW
WILL BECOME HEAVY AT TIMES AND CONTINUE THROUGH MID MORNING THURSDAY.
TOTAL SNOWFALL ACCUMULATION WILL RANGE FROM 2 INCHES NEAR
BOULDER...TO 5 OR 6 INCHES NEAR BONDURANT.

IF TRAVEL IS PLANNED IN THE THESE AREAS LATE TONIGHT THROUGH
TOMORROW MORNING...SLOW DOWN...AND ALLOW ADDITIONAL TIME TO REACH
YOUR DESTINATION.

A SNOW ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY
TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND
LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING.

$$

LIPSON

000 
WWUS45 KRIW 290947
WSWRIW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
247 AM MST THU DEC 29 2005


WYZ012-014-024-291100-
/O.CAN.KRIW.WS.W.0004.000000T0000Z-051229T1500Z/
TETON AND GROS VENTRE MOUNTAINS-WIND RIVER MOUNTAINS WEST-
SALT RIVER AND WYOMING RANGES-
247 AM MST THU DEC 29 2005

...WINTER STORM WARNING IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS CANCELLED THE WINTER
STORM WARNING. 

PERIODIC SNOW WILL FALL ACROSS THE AREA THROUGH AROUND 8 AM THIS
MORNING. ONLY AN INCH OR 2 OF ADDITIONAL ACCUMULATION CAN BE
EXPECTED.

$$

WYZ013-023-025-291100-
/O.CAN.KRIW.SN.Y.0013.000000T0000Z-051229T1500Z/
JACKSON HOLE-STAR VALLEY-UPPER GREEN RIVER BASIN FOOTHILLS-
INCLUDING THE CITIES OF...JACKSON...AFTON...ALPINE...THAYNE...
PINEDALE
247 AM MST THU DEC 29 2005

...SNOW ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS CANCELLED THE SNOW
ADVISORY.

SCATTERED SNOW SHOWERS WILL PERSIST ACROSS THE REGION THROUGH 8 AM
THIS MORNING. ACCUMULATIONS OF AN INCH OR LESS CAN BE EXPECTED. 

$$

WYZ008-009-291800-
/O.CON.KRIW.SN.Y.0013.000000T0000Z-051229T1800Z/
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
247 AM MST THU DEC 29 2005

...SNOW ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST THIS MORNING...

A SNOW ADVISORY REMAINS IN EFFECT UNTIL 11 AM MST THIS MORNING. 

SNOW WILL FALL IN THE BIGHORN MOUNTAINS THIS MORNING...COMBINING
WITH INCREASING WINDS. TOTAL SNOWFALL ACCUMULATION OF 3 TO 7
INCHES IS LIKELY. NORTHWEST WINDS OF 30 TO 40 MPH GUSTING TO 55
MPH WILL ALSO ACCOMPANY THE SNOW. THIS WILL SEVERELY REDUCE
VISIBILITIES AND CREATING AREAS OF BLOWING AND DRIFTING SNOW.

A SNOW ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE PRIMARILY
TRAVEL DIFFICULTIES. BE PREPARED FOR SNOW COVERED ROADS AND
LIMITED VISIBILITIES OVER THE MOUNTAIN PASSES...AND USE CAUTION WHILE
DRIVING.

$$

FRIEDERS

000 
WWUS45 KRIW 291746
WSWRIW

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE RIVERTON WY
1046 AM MST THU DEC 29 2005

WYZ008-009-291900-
/O.EXP.KRIW.SN.Y.0013.000000T0000Z-051229T1800Z/
BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST-
1046 AM MST THU DEC 29 2005

...SNOW ADVISORY WILL EXPIRE AT 11 AM MST THIS MORNING...

PERIODIC SNOW WILL CONTINUE TO FALL ACROSS THE BIGHORN MOUNTAINS
THROUGH THE REMAINDER OF THE AFTERNOON. HOWEVER...EXPECT 1 TO 2
INCHES OF ADDITIONAL SNOW FROM THIS ACTIVITY. THEREFORE THE SNOW ADVISORY
HAS BEEN ALLOWED TO EXPIRE AT 11 AM MST.

$$

HAHN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
227 PM MST WED DEC 28 2005

.SHORT TERM...TONIGHT THROUGH SATURDAY...
SNOW AND RAIN STARTING TO PICK UP IN THE WEST AHEAD OF THE NEXT
PACIFIC TROUGH.  THE TROUGH ITSELF EXTENDS FROM THE GULF OF ALASKA
SOUTH TO OFF THE CALIFORNIA COAST.  THE PIECE AFFECTING WESTERN
WYOMING IS THE WAVE MOVING RAPIDLY ON SHORE OVER NORTHEAST
CALIFORNIA.  IT HAS DECENT MOISTURE WITH IT AS EVIDENT BY THE
RAINFALL IN NORTHERN AND CENTRAL CALIFORNIA TODAY. THIS WAVE TO
CONTINUE AN EASTWARD TRACK TONIGHT WITH THE TROUGH AXIS PUSHING INTO
WESTERN WYOMING SLIGHTLY BEFORE 12Z...THEN ALONG THE EASTERN WYOMING
BORDER AT 18Z.  THIS SYSTEM TO BRING A PLETHORA OF WEATHER TONIGHT
AND TOMORROW...FROM HEAVY SNOW AND SOME RAIN IN THE WEST TO SNOW AND
WIND IN THE CENTRAL AND EAST.  WITH ABUNDANT MOISTURE...DECENT JET
DYNAMICS AND FAVORABLE OROGRAPHIC FLOW...EXPECT SIGNIFICANT SNOWFALL
IN THE WEST THROUGH 15Z THURSDAY.  MUCH COOLER AIR WILL MOVE IN BY
MIDNIGHT TONIGHT...CHANGING THE VALLEYS BACK OVER TO SNOW.  WILL
CONTINUE THE WINTER STORM WARNING FOR THE TETONS...12 TO 18 INCHES...
SALTS...12 TO 18 INCHES...AND WESTERN WIND RIVERS...8 TO 14 INCHES
THROUGH 15Z THURSDAY. ALSO ISSUED SNOW ADVISORIES FOR THE STAR
VALLEY...2 TO 4 INCHES...JACKSON HOLE 3 TO 5 INCHES AND UPPER GREEN
RIVER BASIN...3 TO 5 INCHES. EAST OF THE DIVIDE THE SNOW WILL MOVE
INTO THE NORTHERN BIGHORNS AFTER MIDNIGHT UNDER FAVORABLE NORTHWEST
FLOW.  AGAIN...GOOD DYNAMICS AND ABUNDANT MOISTURE. EXPECTING
BETWEEN 4 TO 8 INCHES THERE...SO HAVE ISSUED ADVISORY.  JOHNSON
COUNTY WILL GET IN ON THE ACTION AS WELL...BUT EXPECT THEM TO BEGIN
RAIN TURNING OVER TO SNOW BY 12Z...WITH 1 TO 3 INCHES THERE.  THE
MAIN CONCERN THURSDAY WILL BE THE POST TROUGH WINDS IN THE FAVORED
AREAS.  THESE INCLUDE UPPER GREEN RIVER BASIN...SWEETWATER COUNTY...
WIND RIVER BASIN AND JOHNSON COUNTY INCLUDING THE BIGHORN
MOUNTAINS.  NORTHWEST WINDS OF 20 TO 30 MPH WITH HIGHER GUSTS WILL
BE COMMON WITH SOME AREAS IN JOHNSON COUNTY AND ADJACENT BIGHORNS
COULD SEE 30 TO 40 MPH WITH HIGHER GUSTS.  IN THE MOUNTAINS...THIS
COULD CAUSE SIGNIFICANT BLOWING AND DRIFTING SNOW.  HIGHS THURSDAY IN
THE 20S WEST AND 30S TO LOWER 40S EAST.  A BRIEF BREAK IN THE
ACTION FOR THURSDAY NIGHT AND FRIDAY MORNING.  THEN THE NEXT
PACIFIC SYSTEM MOVES ON SHORE FRIDAY WITH SNOW INCREASING FRIDAY
AFTERNOON IN THE WEST.  THE SNOW CONTINUES THROUGH SATURDAY WITH
THE NEXT WAVE ON ITS HEELS.  EACH WITH THE POTENTIAL FOR SIGNIFICANT
SNOWFALL.

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY...
GFS AND ECMWF MEDIUM RANGE GUIDANCE CONTINUES IN OVERALL GOOD
AGREEMENT AND REMAINING CONSISTENT FOR THE EXTENDED FORECAST EVEN
WITH THIS FAST/PROGRESSIVE PATTERN. GIVEN THIS MODEL PERSISTENCE...
HIT PRECIP CHANCES HARD AGAIN WEST OF THE DIVIDE INTO SATURDAY NIGHT
WITH LATEST MOIST SHORT WAVE TROUGH PASSAGE. WITH SHORT WAVE TROUGH
PASSAGE EAST OF DIVIDE NEW YEARS EVE INTO NEW YEARS DAY...A FEW SNOW
AND EVEN RAIN SHOWERS COULD SPILL OVER TO AREAS EAST OF DIVIDE. VERY
BRIEF UPPER LEVEL RIDGING SHOULD TAPER PRECIP OFF LATE SUNDAY INTO
SUNDAY NIGHT...BUT THE WEST SHOULD QUICKLY RETURN TO INCREASED SNOW
CHANCES AGAIN MONDAY AND MONDAY NIGHT. HAVE RAISED PRECIP CHANCES IN
THE WEST FOR THIS TIME FRAME AS WELL. LATEST GFS MORE AMPLIFIED WITH
PATTERN AFTER THIS SYSTEM AND HIGHER AMPLITUDE RIDGING AND DRY
CONDITIONS ADVERTISED OVERHEAD BY WEDNESDAY. NOT COMPLETELY BUYING
INTO THIS YET. HAVE KEPT A CHANCE FOR SNOW IN THE WEST WEDNESDAY AND
WILL WAIT TO SEE SOME RUN TO RUN CONTINUITY ON THIS OVER THE NEXT
FEW MODELS. NOT A LOT OF TEMPERATURES FLUCTUATIONS WITH THE
PROGRESSION OF THESE PACIFIC SYSTEMS. HAVE ONLY MADE MINOR
ADJUSTMENTS AS TIMING OF SYSTEM BECOMES MORE CLEAR. OVERALL...ABOVE
NORMAL TEMPERATURES WILL PREVAIL ESPECIALLY IN DRIER AREAS EAST OF
DIVIDE.

&&

.RIW WATCHES/WARNINGS/ADVISORIES...WINTER STORM WARNING FOR THE
TETONS...ZONE 12 THE SALT AND WYOMING RANGES...ZONE 24 AND ZONE 14
THE WEST SLOPES OF THE WIND RIVER MOUNTAINS THROUGH 8 AM THURSDAY.
SNOW ADVISORY FOR ZONE 13...JACKSON HOLE AND ZONE 23...STAR VALLEY
THROUGH 8 AM THURSDAY.
SNOW ADVISORY FOR ZONES 8 AND 9 THE BIGHORN MOUNTAINS FROM 11 PM
TONIGHT THROUGH 11 AM THURSDAY.

&&

SHORT TERM...LIPSON
LONG TERM...FRIEDERS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
227 PM MST WED DEC 28 2005

WYZ001>020-022>030-291200-
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-
227 PM MST WED DEC 28 2005

...WINTER STORM WARNING IS IN EFFECT THROUGH EARLY TOMORROW MORNING
FOR THE WESTERN WYOMING MOUNTAINS...
...SNOW ADVISORY IS IN EFFECT FOR THE BIGHORN MOUNTAINS...STAR
VALLEY...JACKSON VALLEY...AND UPPER GREEN RIVER BASIN FOOTHILLS LATE
TONIGHT THROUGH TOMORROW MORNING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TONIGHT

A MOIST PACIFIC STORM SYSTEM WILL CONTINUE TO DRAG A COLD FRONT
THROUGH WESTERN WYOMING TONIGHT. SNOW WILL CONTINUE TO FALL AND
BECOME HEAVY AT TIMES ACROSS WESTERN WYOMING OVERNIGHT. SNOWFALL
AMOUNTS OF 10 TO 18 INCHES CAN BE EXPECTED IN THE MOUNTAINS...WITH
3 TO 5 INCHES EXPECTED IN THE WESTERN VALLEYS TONIGHT. IN ADDITION
TO THE SNOW...GUSTY WINDS IN SOME AREAS WILL CREATE SIGNIFICANT
AREAS OF BLOWING AND DRIFTING SNOW...ESPECIALLY AT PASS LEVEL. IF YOU
MUST TRAVEL ACROSS WESTERN WYOMING THROUGH TONIGHT...BE PREPARED FOR
HEAVY SNOWFALL AND POOR DRIVING CONDITIONS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

SNOW AND BLOWING SNOW WILL SHIFT INTO THE BIGHORN MOUNTAINS BY EARLY
THURSDAY MORNING. EXPECT 4 TO 8 INCHES OF SNOW COMBINING WITH 45 TO
50 MPH WIND GUSTS. THIS WILL CREATE DANGEROUS TRAVEL CONDITIONS OVER
MOUNTAIN PASSES.

SEVERAL ROUNDS OF SNOW WILL CONTINUE TO BE LIKELY ACROSS THE WESTERN
WYOMING MOUNTAINS AND VALLEYS INTO EARLY NEXT WEEK. THE GREATEST
THREAT FOR ACCUMULATING SNOWFALL IS FORECAST FOR SATURDAY AND
SATURDAY NIGHT AND THEN AGAIN MONDAY AND MONDAY NIGHT. GUSTY WINDS
WILL ALSO ACCOMPANY THESE SNOWS...PRODUCING AREAS OF BLOWING AND
DRIFTING SNOW...ESPECIALLY IN THE HIGHER MOUNTAIN PASSES. STAY TUNED
FOR FUTURE UPDATES ON THESE POTENTIAL HEAVIER SNOWFALL EVENTS

.SPOTTER INFORMATION STATEMENT...

SPOTTERS SHOULD REPORT SNOWFALL AMOUNTS TO THE NATIONAL WEATHER
SERVICE AT 1-800-211-1448.

TRIW

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
1053 AM MST WED DEC 28 2005

WYZ013-282300-
JACKSON HOLE-
1053 AM MST WED DEC 28 2005

...ACCUMULATING SNOWFALL EXPECTED TONIGHT...

A MOIST PACIFIC STORM SYSTEM WILL APPROACH WYOMING TODAY AND
MOVE THROUGH THE REGION TONIGHT. TEMPERATURES IN THE LOWER ELEVATIONS
OF JACKSON HOLE WILL BE TOO WARM FOR SIGNIFICANT SNOWFALL TODAY. THE
SNOW COULD EVEN MIX WITH RAIN AT TIMES THIS AFTERNOON. BY TONIGHT...
COLDER AIR WILL MOVE INTO THE AREA AND THE PRECIPITATION WILL CHANGE
OVER TO ALL SNOW AND BEGIN TO ACCUMULATE...WITH THE POTENTIAL FOR 3
TO 5 INCHES BY THURSDAY MORNING.

LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET TO
GET THE LATEST OBSERVATIONS AND FORECASTS BEFORE TRAVELING.

WYZ001-002-282300-
ABSAROKA MOUNTAINS-YELLOWSTONE NATIONAL PARK-
1053 AM MST WED DEC 28 2005

...ACCUMULATING SNOWFALL EXPECTED BY TONIGHT...

A MOIST PACIFIC STORM SYSTEM WILL APPROACH WYOMING TODAY AND
MOVE ACROSS THE REGION TONIGHT. LIGHT SNOW WILL DEVELOP ACROSS THESE
AREAS THIS AFTERNOON AND WILL BECOME HEAVIER TONIGHT. A WIDE RANGE OF
SNOWFALL IS EXPECTED OVER YELLOWSTONE PARK AND THE ABSAROKA MOUNTAINS
THROUGH THURSDAY MORNING. WHILE THE BULK OF THE SNOW IS EXPECTED
SOUTH OF THIS AREA...THE SOUTHERN ABSAROKAS AND HIGHER ELEVATIONS IN
YELLOWSTONE COULD SEE 6 TO 12 INCHES OF NEW SNOW BY SUNRISE THURSDAY.
4 TO 8 INCHES ARE FORECAST FOR THE NORTHERN ABSAROKAS AND LOWER
ELEVATIONS OF YELLOWSTONE.

LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET TO
GET THE LATEST OBSERVATIONS AND FORECASTS BEFORE TRAVELING.

WYZ023-027-282300-
SOUTH LINCOLN COUNTY-STAR VALLEY-
1053 AM MST WED DEC 28 2005

...ACCUMULATING SNOWFALL EXPECTED TONIGHT...

A MOIST PACIFIC STORM SYSTEM WILL APPROACH WYOMING TODAY AND
MOVE ACROSS THE REGION TONIGHT. TEMPERATURES IN THE LOWER ELEVATIONS
OF LINCOLN COUNTY WILL BE TOO WARM FOR SIGNIFICANT SNOW ACCUMULATION
TODAY AND WILL LIKELY MIX WITH OR BE RAIN IN MANY AREAS THIS
AFTERNOON. BY TONIGHT...COLDER AIR WILL MOVE INTO THE AREA AND THE
PRECIPITATION WILL CHANGE OVER TO ALL SNOW AND BEGIN TO ACCUMULATE...
WITH THE POTENTIAL FOR 2 TO 4 INCHES BY THURSDAY MORNING.

LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET TO
GET THE LATEST OBSERVATIONS AND FORECASTS BEFORE TRAVELING.

WYZ025-026-282300-
UPPER GREEN RIVER BASIN-UPPER GREEN RIVER BASIN FOOTHILLS-
1053 AM MST WED DEC 28 2005

...ACCUMULATING SNOWFALL EXPECTED TONIGHT...

A MOIST PACIFIC STORM SYSTEM WILL APPROACH WYOMING TODAY AND
MOVE ACROSS THE REGION TONIGHT. SOME LIGHT SNOW WILL DEVELOP
THROUGH THE DAY TODAY ACROSS THE UPPER GREEN RIVER BASIN...BUT
ACCUMULATIONS ARE EXPECTED TO REMAIN LIGHT. BY TONIGHT...A
HEAVIER ROUND OF SNOW IS FORECAST WITH ACCUMULATIONS OF 3 TO 6
INCHES POSSIBLE. THE HEAVIEST AMOUNTS SHOULD BE FROM PINEDALE TO
BONDURANT.

LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET TO
GET THE LATEST OBSERVATIONS AND FORECAST BEFORE TRAVELING.

WYZ015-282300-
WIND RIVER MOUNTAINS EAST-
1053 AM MST WED DEC 28 2005

...ACCUMULATING SNOWFALL EXPECTED TODAY INTO TONIGHT...

A MOIST PACIFIC STORM SYSTEM WILL APPROACH WYOMING TODAY AND
MOVE ACROSS THE REGION TONIGHT. SNOW IS EXPECTED TO DEVELOP
ALONG THE HIGHER PEAKS OF THE WIND RIVER MOUNTAINS LATER THIS
MORNING AND CONTINUE INTO TONIGHT. TOTAL SNOWFALL OF 4 TO 8
INCHES CAN BE EXPECTED IN THE HIGHEST ELEVATIONS INCLUDING TOGWOTEE
PASS BY THURSDAY MORNING. LESSER AMOUNTS ARE ANTICIPATED SOUTHEAST
TOWARD SOUTH PASS. EVEN SO...STRONG WINDS NEAR SOUTH PASS WILL CREATE
REDUCED VISIBILITIES AND POOR DRIVING CONDITIONS TONIGHT AND
TOMORROW MORNING.

IF YOU MUST TRAVEL IN OR NEAR THE WIND RIVER MOUNTAINS THROUGH
TONIGHT...ALLOW EXTRA TIME TO REACH YOUR DESTINATION.  PACK A WINTER
SAFETY KIT INCLUDING A SHOVEL...TIRE CHAINS...AND EXTRA CLOTHING.
LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE INTERNET TO
GET THE LATEST OBSERVATIONS AND FORECAST BEFORE TRAVELING.

TRIW