A combination of a tight pressure gradient associated with a cold front crossing the area and strong mid-level winds mixing to the surface produced high winds in portions of central Wyoming. Peak gusts of 58 mph and 63 mph were recorded at the Fales Rock RAWS and Hiland, respectively.
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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 RIW wrote it up.
A combination of a tight pressure gradient associated with a cold front crossing the area and strong mid-level winds mixing to the surface produced high winds in portions of central Wyoming. Peak gusts of 58 mph and 63 mph were recorded at the Fales Rock RAWS and Hiland, respectively. The strongest winds occurred along State Highway 28 between Lander and Red Canyon. Gusts exceeding 60 mph were recorded near Red Canyon for several hours.
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 Riverton, WY wrote its last area forecast discussion before the first event at Sep 16, 1:51 AM MST, 4 hours 39 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 251 AM MDT WED SEP 16 2015 .SHORT TERM...TODAY THROUGH FRIDAY NIGHT WV IMAGERY SHOWING ROBUST TROF/RIDGE PATTERN FROM W TO E ACROSS THE CONUS W/ WY UNDER GOOD SW FLOW. ONE EMBEDDED WAVE/JET STREAK OVR ECNTRL WY EXITING TO CNTRL/NRN PLAINS...WITH ANOTHER UPSTREAM WAVE AND 100+ KT JET...WITH A FAIRLY WELL DEFINED BAROCLINIC LEAF OVR SCNTRL ID...HEADED INTO WRN WY THIS MORNING. SFC HAS NEARLY STATIONARY FRONT SAGGING INTO NRN WY WITH A LARGER DEVELOPING CYCLONE ACROSS THE GREAT BASIN REGION OF NV/UT....THEN EVENTUALLY ID/NWRN WY. TODAY...INTERMOUNTAIN WEST/NRN ROCKIES UNDERGOING STRONG CYCLOGENESIS...WITH CYCLONE QUICKLY HEADED NE TOWARD SWRN MT BEFORE JUMPING EWD WITH THE TRANSLATION OF THE UPR TROF AND JET...WITH LEE SIDE CYCLOGENESIS PROGRESSING BY THIS AFTERNOON FROM NRN TO NERN WY/SERN MT. COPIOUS RAINFALL EARLY...BECOMING MIXED WITH AND TURNING TO SNOW (SHOWERS) BY MID MORNING ACROSS THE WEST. SNOW LEVELS WILL GENERALLY DROP FROM WELL ABOVE 11K FT EARLY THIS MORNING TO 8 - 8.5K FT BY THIS AFTERNOON...THEN PERHAPS 7.5K FT BY THURSDAY MORNING. 24 HR SNOW AMOUNTS IN THE MOUNTAINS ABOVE 8000 FEET WILL RANGE FROM 1 TO 3 INCHES AT MOST LOCATIONS...WITH A FEW SPOTS IN THE TETONS AND WRN WIND RIVER MOUNTAINS SEEING 3 TO 5 INCHES AT FAVORED LOCATIONS IN THE HIGHEST ELEVATIONS. SPS TO GO ALONG WITH THIS. MEANWHILE...IN THE WARM SECTOR E OF THE DIVIDE...THERE WILL BE A RAPID INCREASE IN THE SFC PRESSURE GRAD. THIS ALONG WITH INCREASED UPR LVL WINDS IN THE VCNTY OF THE JET AND MODEST INSTABILITY WILL ALLOW FOR LL SW WINDS TO INCREASE THIS AFTERNOON TO NEAR WARNING CRITERIA ACROSS THE WIND CORRIDOR FROM NRN SWEETWATER COUNTY INTO NATRONA COUNTY (ZONES 19 AND 20). THESE ZONES WILL LIKELY SEE WINDS BLOWING 28 TO 38 MPH WITH GUSTS 45 TO OCCASIONAL 55+ MPH WITH THE WINDIEST LOCATIONS LIKELY BETWEEN JEFFREY CITY...BAIROIL...AND ERVAY. HIGH WIND WARNING TO COVER THIS. ADDITIONALLY...THE LANDER FOOTHILLS (ZONE 18) WILL ALSO SEE SOME MOUNTAIN WAVE ACTION WITH WINDS SPEEDS 20 TO 35 MPH BUT WITH OCCASIONAL GUSTS 60 TO 65 MPH AT TIMES...ESPECIALLY EARLY IN THE WARNING PERIOD (12PM TO 8PM). OTHERWISE...FRONT THRU E OF THE DIVIDE IN THE EVENING W/ PRECIP CHCS ENDING QUICKLY FROM W TO E MAINLY ALONG/NEAR THE FRONT. THURSDAY WILL START OUT RATHER BENIGN ACROSS MOST OF THE FA...POST FRONTAL AND A FEW SHOWERS LINGERING MAINLY ACROSS THE FAR SRN ZONES. THEN THE NEXT STRONG EMBEDDED WAVE MOVES DOWN THRU THE MAIN TROF OUT OF THE PAC NW...SPURRING THE PRODUCTION OF LEE CYCLOGENESIS IN COLORADO...WITH GOOD WRAP AROUND MOISTURE RETURN INTO ERN WY BY THURSDAY NIGHT. SO...LIGHT TO MODERATE SNOW SHOWERS ACROSS THE WEST BY EARLY AFTERNOON...RAIN OR RAIN MIXED WITH SNOW OCCASIONALLY CENTRAL AND EAST BY EARLY/MID EVENING...LASTING INTO FRIDAY MORNING BEFORE EXITING EWD INTO THE PLAINS. 24 HR SNOW TOTALS THRU FRIDAY MORNING SIMILAR TO THE DAY BEFORE ACROSS THE WEST...WITH 2 TO 4 INCHES POSSIBLE OVR THE NRN BIG HORN MOUNTAINS WHEN ALL IS SAID AND DONE. BY FRIDAY MID-DAY...SECONDARY FRONT MOVES S ACROSS THE ERN ZONES...WITH IMPROVING CONDITIONS BUT SEASONALLY COOL/COLD MOST LOCATIONS. DRY THROUGH THE REST OF THE FCST PERIOD UNDER UPR LVL SW RIDGING AND SFC HIGH PRESSURE. .LONG TERM...SATURDAY THROUGH WEDNESDAY SYNOPSIS...A MAINLY DRY WESTERLY FLOW WILL BRING A WARMING TREND OVER THE WEEKEND INTO THE FIRST DAY OF AUTUMN. THE AUTUMNAL EQUINOX OCCURS AT 221 AM MDT WEDNESDAY SEPTEMBER 23RD. DISCUSSION...ONE LAST WEAK RIPPLE IN WESTERLY FLOW WILL MOVE EAST ACROSS WYOMING SATURDAY MORNING WITH SPARSE MOISTURE TO WORK WITH...POSSIBLY GENERATING A FEW SHOWERS ACROSS THE NORTHERN MOUNTAINS. A BROAD ZONAL FLOW DEVELOPS BY MONDAY WITH W-E POLAR JET STREAM STRETCHING ALONG 50N BEFORE FLOW BEGINS TO BACK BY WEDNESDAY AS UPPER TROUGH DIGS ACROSS THE NE PACIFIC. A SHORTWAVES MOVING ACROSS WEST AND CENTRAL CANADA MAY PUSH A WEAK COLD FRONT INTO NORTHERN WYOMING MONDAY NIGHT...AND LEFT THE IDEA OF SLIGHT CHANCE POPS ACROSS THE FAR NORTH ALONG THIS BOUNDARY. HOWEVER...THE SHALLOW FRONT WILL NOT IMPACT OVERALL WARMING TREND AS HEIGHTS BUILD ON TUESDAY...H7 TEMPERATURES RISE TO NEAR 10-12C. AS FLOW BEGINS TO BACK ON WEDNESDAY...BOTH ECMWF AND GFS BRING UP SOME SUB-TROPICAL MOISTURE NORTH ACROSS THE GREAT BASIN...INTO SOUTHERN WYOMING LATE WEDNESDAY. CONFIDENCE TOO LOW THAT ANY OF THIS MOISTURE WILL MAKE IT THIS FAR NORTH ON THE FIRST DAY OF AUTUMN (EIGHT DAYS OUT) TO ADD SIGNIFICANT POPS ACROSS THE SOUTH. && .AVIATION.../12Z ISSUANCE/ PLEASE SEE THE AVIATION WEATHER CENTER FOR THE LATEST INFORMATION ON ICING AND TURBULENCE FORECASTS. WEST OF THE DIVIDE...KBPI/KJAC/KPNA/KRKS ROUTES WIDESPREAD MOUNTAIN SNOW/VALLEY RAIN WITH A FEW THUNDERSTORMS WILL OCCUR TODAY...ESPECIALLY ALONG AND NORTHWEST OF A KEMMERER TO SOUTH PASS LINE. THE MOST IMPACTED TERMINAL WILL BE KJAC WHERE PERIODS OR EVEN PERSISTENT MVFR CONDITIONS ARE EXPECTED THIS MORNING GRADUALLY IMPROVING IN THE MID/LATE AFTERNOON. MOUNTAINS WILL BE OBSCURED THROUGH THE DAY...WITH LIFR CONDITIONS OVER MOUNTAIN PASSES. THE EXCEPTION WILL BE SOUTH PASS WHERE CEILINGS ARE EXPECTED TO BE HIGHER. SNOW LEVELS ARE EXPECTED TO LOWER TO ABOUT 8000 FEET THIS MORNING OVER THE FAR WEST...WITH POTENTIAL ICING OCCURS. STRONG SOUTH TO SOUTHWEST WINDS WILL DEVELOP IN MOST LOCATIONS THIS MORNING...WITH A SHIFT TO MORE WESTERLY IN THE AFTERNOON AND EVENING IN WAKE OF THE FRONT. THE PRECIPITATION IS EXPECTED TO END IN MOST AREAS BETWEEN 21Z AND 02Z...WITH THE EXCEPTION OVER SWEETWATER COUNTY AND YELLOWSTONE WHERE SOME SHOWER ACTIVITY COULD LINGER. DUE TO THE RECENT PRECIPITATION AND HIGH BL MOISTURE AND SOME CLEARING...EXPECT SOME FOG/LOW CLOUDS TO FORM. WILL HANDLE THIS WITH SOME VCFG FOR NOW. EAST OF THE DIVIDE...KCOD/KCPR/KLND/KRIW/KWRL ROUTES INITIALLY THE MAIN CONCERN WILL BE SOME LOW LEVEL WIND SHEAR ON THE LEE SIDE OF MOUNTAIN RANGES...ESPECIALLY AT KLND. STRONG SOUTH TO SOUTHWEST WINDS ARE EXPECTED TO DEVELOP BY LATE MORNING IN MOST AREAS...SHIFTING TO THE WEST OR NORTHWEST IN WAKE OF A STRONG COLD FRONT PUSHING ACROSS THE AREA BETWEEN 20Z AND 01Z. MUCH OF THE PRECIPITATION WILL FALL ALONG AND WEST OF THE DIVIDE WITH THIS SYSTEM...BUT EXPECT ISOLATED TO LOCALLY SCATTERED CONVECTION IN THE AFTERNOON/EVENING ESPECIALLY AS THE FRONT MOVES ACROSS THE AREA. BRIEF MVFR CONDITIONS COULD OCCUR IN SHOWER ACTIVITY AT AREA TERMINALS...OTHERWISE VFR CONDITIONS WILL PREVAIL THROUGH THE TAF PERIOD. ROUTES FLYING WEST OVER THE DIVIDE KRIW OR KCOD TO KJAC WILL ENCOUNTER IFR/LIFR CONDITIONS IN LOW CLOUDS AND SNOW. && .FIRE WEATHER... FIRE DANGER LOW WEST OF THE DIVIDE...LOW TO MODERATE EAST OF THE DIVIDE AS A COUPLE OF ROBUST EARLY WINTER WEATHER SYSTEMS BUILD INTO WYOMING FROM THE WEST. COOLER EVERYWHERE TODAY BY AS MUCH AS 10 DEGREES...WITH INCREASED RH VALUES. ZONES WEST OF THE DIVIDE SHOULD SEE GOOD INCREASING CHANCES FOR WETTING RAINS (SNOWS ABOVE 8500 FEET) TODAY/TONIGHT. EAST OF THE DIVIDE WILL BE QUITE BREEZY/WINDY...ESPECIALLY ACROSS THE WIND CORRIDOR BETWEEN NORTHERN SWEETWATER COUNTY AND NATRONA COUNTY WITH ISOLATED TO WIDELY SCATTERED SHOWERS OR AN ISOLATED THUNDERSTORM BY LATE AFTERNOON EVENING. LATER THURSDAY...ANOTHER EARLY WINTER SYSTEM WILL HEAD INTO WYOMING...OFFERING UP MORE SNOW AND RAIN SHOWERS WEST...AND BETTER CHANCES FOR WETTING RAINS EAST OF THE DIVIDE THIS TIME AROUND...AND ALL WITH A BIT LESS WIND TO AGGRAVATE THINGS. SIGNIFICANT DRYING WILL NOT BEGIN TO OCCUR UNTIL AT LEAST SATURDAY. && .RIW WATCHES/WARNINGS/ADVISORIES... HIGH WIND WARNING FROM NOON TODAY TO 8 PM MDT THIS EVENING FOR WYZ018>020. && SHORT TERM...BRAUN LONG TERM...AEM AVIATION...WM FIRE WEATHER...BRAUN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 309 AM MDT WED SEP 16 2015 WYZ001>020-022>030-171100- YELLOWSTONE NATIONAL PARK-ABSAROKA MOUNTAINS-CODY FOOTHILLS- NORTH BIG HORN BASIN-SOUTHWEST BIG HORN BASIN- SOUTHEAST BIG HORN BASIN-OWL CREEK AND BRIDGER MOUNTAINS- BIGHORN MOUNTAINS WEST-BIGHORN MOUNTAINS SOUTHEAST- NORTHEAST JOHNSON COUNTY-SOUTHEAST JOHNSON COUNTY- TETON AND GROS VENTRE MOUNTAINS-JACKSON HOLE- WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST- UPPER WIND RIVER BASIN-WIND RIVER BASIN-LANDER FOOTHILLS- GREEN MOUNTAINS AND RATTLESNAKE RANGE- NATRONA COUNTY LOWER ELEVATIONS-CASPER MOUNTAIN-STAR VALLEY- SALT RIVER AND WYOMING RANGES-UPPER GREEN RIVER BASIN FOOTHILLS- UPPER GREEN RIVER BASIN-SOUTH LINCOLN COUNTY- ROCK SPRINGS AND GREEN RIVER-FLAMING GORGE-EAST SWEETWATER COUNTY- 309 AM MDT WED SEP 16 2015 ...HIGH WIND WARNING FOR PORTIONS OF CENTRAL WYOMING THIS AFTERNOON AND EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT SCATTERED TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS IN THE WEST...WINDY WITH SCATTERED SHOWERS AND A FEW THUNDERSTORMS ACROSS THE CENTRAL AND SOUTH. HIGH WIND POSSIBLE FROM NATRONA COUNTY...WEST TO THE LANDER FOOTHILLS AND THE GREEN MOUNTAINS. SNOW LEVELS DROPPING FROM 11500 FEET TODAY TO 8500 FEET TONIGHT IN THE WEST. 1 TO 3 INCHES OF SNOW FOR MOST MOUNTAIN LOCATIONS...WITH ISOLATED AREAS RECEIVING UP TO 5 INCHES. SUB FREEZING TEMPERATURES WILL BE POSSIBLE ACROSS MUCH OF THE WESTERN HALF OF THE STATE BY LATE TONIGHT INTO THURSDAY MORNING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THURSDAY...FREEZING TEMPERATURES TO START THE DAY ACROSS THE WEST...WITH SCATTERED TO NUMEROUS SHOWERS AND ISOLATED THUNDERSTORMS ONCE AGAIN POSSIBLE BY MID DAY WEST...AFTERNOON CENTRAL AND EAST...ENDING FROM WEST TO EAST OVERNIGHT THURSDAY INTO FRIDAY MORNING. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT ANY WIND GUSTS IN EXCESS OF 50 MPH OR ANY WIND DAMAGE. THANK YOU.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 217 AM MDT WED SEP 16 2015 WYZ001-161800- YELLOWSTONE NATIONAL PARK- INCLUDING THE CITIES OF...LAKE...MAMMOTH...OLD FAITHFUL 217 AM MDT WED SEP 16 2015 ...WESTERN MOUNTAIN SNOWFALL TODAY AND THURSDAY... ANOTHER SIGNIFICANT ROUND OF PRECIPITATION IS EXPECTED THIS MORNING THROUGH EARLY AFTERNOON FOR YELLOWSTONE. AN ADDITIONAL 0.25 TO 0.50 INCH OF RAIN IS LIKELY...WITH ISOLATED AMOUNTS TO ONE INCH POSSIBLE. A STRONG COLD FRONT WILL SWEEP ACROSS YELLOWSTONE BETWEEN 7 AM AND 10 AM...LOWERING SNOW LEVELS FROM AROUND 10500 FEET TO ABOUT 8000 FEET. 1 TO 3 INCHES OF SNOW COULD ACCUMULATE ABOVE 9000 FEET...BY THE TIME THE PRECIPITATION TAPERS OFF THIS AFTERNOON. MOUNTAIN PASSES SHOULD REMAIN MAINLY WET...BUT COULD BRIEFLY BECOME SLUSHY AND SLICK DURING HEAVIER BURSTS OF SNOWFALL. A BREAK IN THE PRECIPITATION IS EXPECTED WEDNESDAY NIGHT...BEFORE ANOTHER ROUND OF RAIN AND SNOW IS EXPECTED THURSDAY AND THURSDAY NIGHT. WYZ012>016-023>025-161800- TETON AND GROS VENTRE MOUNTAINS-JACKSON HOLE- WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST- UPPER WIND RIVER BASIN-STAR VALLEY-SALT RIVER AND WYOMING RANGES- UPPER GREEN RIVER BASIN FOOTHILLS- INCLUDING THE CITIES OF...JACKSON...DUBOIS...AFTON...ALPINE... STAR VALLEY RANCH...THAYNE...PINEDALE 217 AM MDT WED SEP 16 2015 ...WESTERN MOUNTAIN SNOWFALL TODAY AND THURSDAY... ANOTHER SIGNIFICANT ROUND OF PRECIPITATION IS EXPECTED THIS MORNING THROUGH EARLY AFTERNOON FOR WESTERN WYOMING. AN ADDITIONAL 0.25 TO 0.50 INCH OF RAIN IS LIKELY...WITH ISOLATED AMOUNTS TO ONE INCH POSSIBLE. A STRONG COLD FRONT WILL SWEEP ACROSS WESTERN WYOMING BETWEEN 7 AM AND 10 AM...LOWERING SNOW LEVELS FROM AROUND 10500 FEET TO ABOUT 8000 FEET. 1 TO 3 INCHES OF SNOW COULD ACCUMULATE ABOVE 9000 FEET...WITH HIGHER AMOUNTS POSSIBLE ABOVE 10500 FEET BY THE TIME THE PRECIPITATION TAPERS OFF THIS AFTERNOON. TETON PASS SHOULD SEE A CHANGE OVER TO SNOW LATER THIS MORNING...BUT AT THIS TIME THE ROAD IS EXPECTED TO REMAIN JUST WET. TOGWOTEE PASS COULD BECOME SLUSHY AND SLICK AT THE VERY TOP...ESPECIALLY DURING BURSTS OF HEAVIER BURSTS OF SNOWFALL. THE HIGHER REACHES OF THE WESTERN WIND RIVER MOUNTAINS COULD SEE AS MUCH AS 3 TO 5 INCHES OF NEW SNOWFALL BY THURSDAY MORNING WITH MORE ON THE WAY LATER THURSDAY EVENING. A BREAK IN THE PRECIPITATION IS EXPECTED FOR MUCH OF TONIGHT...BUT ANOTHER ROUND OF ACCUMULATING MOUNTAIN SNOW AND VALLEY RAIN IS EXPECTED THURSDAY...WITH THE RAIN POSSIBLY CHANGING TO SNOW TO THE VALLEY FLOOR ACROSS THE WESTERN VALLEYS THURSDAY NIGHT.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 217 AM MDT WED SEP 16 2015 WYZ001-161800- YELLOWSTONE NATIONAL PARK- INCLUDING THE CITIES OF...LAKE...MAMMOTH...OLD FAITHFUL 217 AM MDT WED SEP 16 2015 ...WESTERN MOUNTAIN SNOWFALL TODAY AND THURSDAY... ANOTHER SIGNIFICANT ROUND OF PRECIPITATION IS EXPECTED THIS MORNING THROUGH EARLY AFTERNOON FOR YELLOWSTONE. AN ADDITIONAL 0.25 TO 0.50 INCH OF RAIN IS LIKELY...WITH ISOLATED AMOUNTS TO ONE INCH POSSIBLE. A STRONG COLD FRONT WILL SWEEP ACROSS YELLOWSTONE BETWEEN 7 AM AND 10 AM...LOWERING SNOW LEVELS FROM AROUND 10500 FEET TO ABOUT 8000 FEET. 1 TO 3 INCHES OF SNOW COULD ACCUMULATE ABOVE 9000 FEET...BY THE TIME THE PRECIPITATION TAPERS OFF THIS AFTERNOON. MOUNTAIN PASSES SHOULD REMAIN MAINLY WET...BUT COULD BRIEFLY BECOME SLUSHY AND SLICK DURING HEAVIER BURSTS OF SNOWFALL. A BREAK IN THE PRECIPITATION IS EXPECTED WEDNESDAY NIGHT...BEFORE ANOTHER ROUND OF RAIN AND SNOW IS EXPECTED THURSDAY AND THURSDAY NIGHT. WYZ012>016-023>025-161800- TETON AND GROS VENTRE MOUNTAINS-JACKSON HOLE- WIND RIVER MOUNTAINS WEST-WIND RIVER MOUNTAINS EAST- UPPER WIND RIVER BASIN-STAR VALLEY-SALT RIVER AND WYOMING RANGES- UPPER GREEN RIVER BASIN FOOTHILLS- INCLUDING THE CITIES OF...JACKSON...DUBOIS...AFTON...ALPINE... STAR VALLEY RANCH...THAYNE...PINEDALE 217 AM MDT WED SEP 16 2015 ...WESTERN MOUNTAIN SNOWFALL TODAY AND THURSDAY... ANOTHER SIGNIFICANT ROUND OF PRECIPITATION IS EXPECTED THIS MORNING THROUGH EARLY AFTERNOON FOR WESTERN WYOMING. AN ADDITIONAL 0.25 TO 0.50 INCH OF RAIN IS LIKELY...WITH ISOLATED AMOUNTS TO ONE INCH POSSIBLE. A STRONG COLD FRONT WILL SWEEP ACROSS WESTERN WYOMING BETWEEN 7 AM AND 10 AM...LOWERING SNOW LEVELS FROM AROUND 10500 FEET TO ABOUT 8000 FEET. 1 TO 3 INCHES OF SNOW COULD ACCUMULATE ABOVE 9000 FEET...WITH HIGHER AMOUNTS POSSIBLE ABOVE 10500 FEET BY THE TIME THE PRECIPITATION TAPERS OFF THIS AFTERNOON. TETON PASS SHOULD SEE A CHANGE OVER TO SNOW LATER THIS MORNING...BUT AT THIS TIME THE ROAD IS EXPECTED TO REMAIN JUST WET. TOGWOTEE PASS COULD BECOME SLUSHY AND SLICK AT THE VERY TOP...ESPECIALLY DURING BURSTS OF HEAVIER BURSTS OF SNOWFALL. THE HIGHER REACHES OF THE WESTERN WIND RIVER MOUNTAINS COULD SEE AS MUCH AS 3 TO 5 INCHES OF NEW SNOWFALL BY THURSDAY MORNING WITH MORE ON THE WAY LATER THURSDAY EVENING. A BREAK IN THE PRECIPITATION IS EXPECTED FOR MUCH OF TONIGHT...BUT ANOTHER ROUND OF ACCUMULATING MOUNTAIN SNOW AND VALLEY RAIN IS EXPECTED THURSDAY...WITH THE RAIN POSSIBLY CHANGING TO SNOW TO THE VALLEY FLOOR ACROSS THE WESTERN VALLEYS THURSDAY NIGHT.
The national radar mosaic for the moment the first event began.
3 high wind. Local standard time, as filed.
Wind gusts along State Highway 28 between Lander and the top of Red Canyon routinely gusted over 60 mph for several hours.
The RAWS site at Fales Rock recorded a wind gust of 58 mph.
The sensor at Hiland recorded wind gusts of 63 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2015Every state in 2015This day in weather historyWarnings in Wyoming, September 2015
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 2026-09-24. Each event’s entry at NCEI: 602480, 600925, 600926.