A Pacific storm system produced snowfall of three to six inches along and west of the Laramie Range, with six to nine inches across portions of east central Wyoming. Gusty east to northeast winds up to 35 mph produced areas of blowing snow and reduced visibilities.
Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CYS wrote it up.
A Pacific storm system produced snowfall of three to six inches along and west of the Laramie Range, with six to nine inches across portions of east central Wyoming. Gusty east to northeast winds up to 35 mph produced areas of blowing snow and reduced visibilities.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Cheyenne, WY wrote its last area forecast discussion before the first event at Nov 18, 2:32 PM MST, 3 hours 28 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
232 PM MST FRI NOV 18 2011
.SHORT TERM...TONIGHT THROUGH SUNDAY...
SNOW...WINDS AND COOLER TEMPERATURES WILL AFFECT MUCH OF THE CWA
THROUGH SUNDAY...ESPECIALLY IN SOUTHEAST WYOMING TONIGHT AND SATURDAY.
A SHORTWAVE TROUGH OVER THE PACIFIC NORTHWEST EARLY THIS AFTERNOON
WILL MOVE EAST ACROSS THE NORTHERN AND CENTRAL ROCKIES AND FILL
THROUGH SATURDAY. THE SURFACE LOW WAS CURRENTLY MOVING INTO NORTHEAST
COLORADO AND WILL SLOWLY MOVE SOUTHEAST THROUGH SATURDAY. THE 300 MB
JET WILL MOVE ACROSS CENTRAL OR SOUTHERN WYOMING DURING THAT TIME
AND WILL RIDE OVER THE BOUNDARY LAYER UPSLOPE. THE FAVORABLE LIFT
AND MOISTURE WILL PRODUCE ACCUMULATING SNOW OVER MAINLY THE NORTH
AND WEST PARTS OF THE CWA TONIGHT AND SATURDAY MORNING. SATELLITE
CLOUD TOPS CONTINUE TO COOL UPSTREAM OF THE CWA AND SNOW HAS BEEN
FALLING OVER MUCH OF WESTERN AND NORTHERN WYOMING SINCE THE MORNING
HOURS. SOME OF THE SNOWFALL IN THOSE AREAS HAS BEEN HEAVY WITH RATES
OF ONE TO TWO INCHES PER HOUR. THE BAROCLINIC CLOUD BAND AND SNOW
WILL SAG SLOWLY SOUTHEAST AND PRODUCE THE SNOW OVER THE WESTERN
AND NORTHERN PARTS OF OUR CWA. WILL CONTINUE THE PREVIOUSLY ISSUED
WINTER HIGHLIGHTS FOR THOSE AREAS THROUGH MIDDAY SATURDAY. WINDS
WILL INCREASE LATER TONIGHT AND CONTINUE INTO SATURDAY AFTERNOON
OVER THE CWA..ESPECIALLY THE SOUTH. THE WINDS WILL PRODUCE BLOWING
SNOW MAINLY WEST OF THE LARAMIE RANGE. STRONG SUBSIDENCE MAY ALSO
PRODUCE HIGH WIND CRITERIA WINDS OVER THE SOUTHERN LARAMIE RANGE
AND THE CHEYENNE FOOTHILLS LATE TONIGHT THROUGH EARLY AFTERNOON
SATURDAY. HAVE WENT AHEAD AND ISSUED A LATE FIRST PERIOD HIGH WIND
WATCH FOR THAT AREA FROM 10Z TO 20Z. THE SNOW WILL TAPER OFF BY
SATURDAY AFTERNOON AS THE SYNOPTIC LIFT WEAKENS AND ENDS. THE
WINDS WILL DIMINISH OVER THE CWA SATURDAY EVENING. THE REMAINDER
OF THE FORECAST WILL BE QUIETER WITH SLIGHTLY WARMER TEMPERATURES
BY SUNDAY AND MAINLY OROGRAPHIC SNOWFALL.
.LONG TERM...SUNDAY NIGHT THROUGH FRIDAY...
THE 12Z GFS AND ECMWF SOLUTIONS ARE REMARKABLY SIMILAR TO THE 06Z RUN.
THE 500 MB FLOW WILL BE START THE MEDIUM RANGE PERIOD AS NEAR ZONAL.
A CLOSED MID LEVEL LOW OFF THE SOUTHERN CALIFORNIA COAST WILL OPEN UP
AND DEAMPLIFY AS IT MOVES EAST ACROSS THE FOUR CORNERS MONDAY AND
SOUTHERN PLAINS ON TUESDAY. THE EFFECTS FROM THIS SOUTHERN STREAM
SYSTEM WILL BE MAINLY OROGRAPHIC SNOWFALL FOR THE SNOWY AND SIERRA
MADRE RANGES SUNDAY NIGHT AND MONDAY. THE SNOW WILL TAPER OFF AND
END MONDAY NIGHT WITH DRIER NORTHWESTERLY FLOW IN THE WAKE OF THE
TROUGH. THE NORTH-SOUTH RIDGE AXIS WILL BE CENTERED OVER THE CWA
ON WEDNESDAY AND OVER THE GREAT PLAINS ON THANKSGIVING DAY. THIS
PATTERN SHIFT WILL BACK THE WINDS ALOFT TO SOUTHWESTERLY WELL IN
ADVANCE OF THE NEXT PACIFIC TROUGH COMING ONSHORE. THE 700 MB
PRESSURE GRADIENT TIGHTENS (CRAIG TO CASPER 50 TO 70 DAM) WITH
WESTERLY 700 MB WINDS 50-60 KT FROM 12Z THURSDAY THROUGH 00Z
SATURDAY. A LEE SURFACE TROUGH OVER THE WESTERN NEBRASKA THURSDAY
AND FRIDAY WILL ACCENTUATE THE DOWNSLOPE FLOW...WITH SUSTAINED
WINDS WEST WINDS 25-35 KT GUSTING TO 50 KT OVER MUCH OF SOUTHEAST
WYOMING. HIGH TEMPERATURES MONDAY WILL BE MODERATING WITH 30S AND
40S. TUESDAY THROUGH THANKSGIVING DAY WILL SEE TEMPERATURES 10 TO
15 DEGREES ABOVE NORMAL WITH HIGHS IN THE 40S AND 50S. THE NEXT
PACIFIC COLD FRONT WILL BE MOVING THROUGH WYOMING ON FRIDAY...WITH
AREAS ALONG AND WEST OF THE LARAMIE RANGE ABOUT 10 DEGREES COOLER
FROM THURSDAY/S HIGHS. THESE AREAS WILL ALSO SEE INCREASING CHANCES
FOR MOUNTAIN SNOWS...WITH A RAIN/SNOW MIX FOR THE VALLEYS.
&&
.AVIATION...18Z TAF ISSUANCE...
A COLD FRONT ALIGNED EAST TO WEST ACROSS CENTRAL WYOMING WILL SLOWLY
SAG SOUTHWARD THROUGH THIS EVENING...REACHING SOUTHERN WYOMING TONIGHT.
WESTERLY SURFACE WINDS SOUTH OF THE FRONT WILL BE GUSTING AS HIGH AS
35 KT ACROSS MUCH OF SOUTHEAST WYOMING THROUGH THIS AFTERNOON...WITH
LIGHTER WINDS OVER THE WESTERN NEBRASKA PANHANDLE. THIS WILL RESULT
IN LOWERING CEILINGS THIS AFTERNOON...ESPECIALLY ACROSS THE NORTHERN
AND WESTERN PORTIONS OF THE FORECAST AREA. MVFR CONDITIONS WITH
SNOW SHOWERS WILL BE POSSIBLE AT RAWLINS BY LATE THIS AFTERNOON...
SPREADING EAST AND NORTHEAST TO LARAMIE AND CHADRON BY LATE THIS
EVENING. AFTER 06Z SATURDAY...EXPECT IFR TO LIFR CEILINGS AND
VISIBILITIES AT RAWLINS...LARAMIE AND CHADRON. MVFR CEILINGS WILL
BE POSSIBLE AT ALLIANCE...WITH VFR CEILINGS AND VISIBILITIES AT
SCOTTSBLUFF...SIDNEY AND CHEYENNE.
&&
.FIRE WEATHER...
STRONG WESTERLY SURFACE WINDS AND MILD AND DRY CONDITIONS WILL AFFECT
THE SOUTH PART OF THE CWA THROUGH SUNSET. OTHERWISE...A STORM SYSTEM
WILL PRODUCE PRECIPITATION AND COOLER TEMPERATURES OVER THE CWA THROUGH
SUNDAY. WARMER AND DRIER WEATHER WILL RETURN TO THE CWA FOR NEXT WEEK...
WITH POSSIBLE WINDY CONDITIONS MAINLY ON THANKSGIVING.
&&
.CYS WATCHES/WARNINGS/ADVISORIES...
WY...WINTER STORM WARNING FROM 6 PM FRIDAY TO NOON SATURDAY FOR
WYZ101-WYZ102.
WINTER WEATHER ADVISORY FROM 6 PM FRIDAY TO NOON SATURDAY FOR
WYZ103-WYZ104-WYZ105-WYZ109-WYZ110-WYZ111-WYZ112-WYZ113-
WYZ114.
HIGH WIND WATCH FROM 3 AM TO 1 PM SATURDAY FOR WYZ116-WYZ117.
NE...NONE.
&&
SHORT TERM/FIRE WEATHER...WEILAND
LONG TERM/AVIATION...JAMSKI<!doctype html>
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</html>SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1201 PM MST FRI NOV 18 2011 WYZ103>107-109-110-113-115>118-182200- NORTH LARAMIE RANGE-FERRIS/SEMINOE/SHIRLEY MOUNTAINS- SHIRLEY BASIN-CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY- EAST PLATTE COUNTY-CENTRAL CARBON COUNTY- NORTH SNOWY RANGE FOOTHILLS-UPPER NORTH PLATTE RIVER BASIN- LARAMIE VALLEY-SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS- CENTRAL LARAMIE COUNTY- INCLUDING THE CITIES OF...MUDDY GAP...MEDICINE BOW...BORDEAUX... GLENDO...WHEATLAND...CHUGWATER...GUERNSEY...RAWLINS...SINCLAIR... HANNA...ARLINGTON...ELK MOUNTAIN...SARATOGA...ENCAMPMENT... RIVERSIDE...LARAMIE...VEDAUWOO...BUFORD...PUMPKIN VINE... HORSE CREEK...HARRIMAN...WHITAKER...CHEYENNE 1201 PM MST FRI NOV 18 2011 ...STRONG WINDS WILL CONTINUE IN SOME AREAS ALONG AND WEST OF THE LARAMIE RANGE THROUGH THE AFTERNOON... WESTERLY WINDS WILL CONTINUE TO BE SUSTAINED AT 25 TO 35 MPH FOR THE REST OF TODAY IN SOME AREAS ALONG AND WEST OF THE LARAMIE RANGE WITH GUSTS AROUND 50 MPH. AT 1150 AM...THE STRONGEST WIND GUSTS WERE 49 MPH AT ARLINGTON AND THE COLMAN INTERSTATE 25 EXIT JUST NORTH OF WHEATLAND. TRAVELERS ON INTERSTATE 25 BETWEEN THE COLORADO BORDER AND WHEATLAND AND INTERSTATE 80 BETWEEN CHEYENNE AND RAWLINS SHOULD BE PREPARED FOR THE STRONG WINDS AND SUDDEN GUSTS. THOSE WITH LIGHTWEIGHT OR HIGH PROFILE VEHICLES WILL BE ESPECIALLY VULNERABLE TO THE STRONG WINDS. WEILAND
The national radar mosaic for the moment the first event began.
3 heavy snow. Local standard time, as filed.
Six to eight inches of snow was reported in northern portions of Converse County.
Eight inches of snow was reported 22 miles north-northeast of Rolling Hills Estates.
Eight and a half inches of snow was reported 20 miles west of Mule Creek Junction.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2011Every state in 2011This day in weather historyWarnings in Wyoming, November 2011
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-30. Each event’s entry at NCEI: 348576, 348577, 348578.