A strong pressure gradient swept strong northwest winds across northern Johnson County on May 31. An automated sensor along Interstate 90 east of Buffalo had several wind gusts past 58 mph with a maximum gust of 65 mph.
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The episode as NWS RIW wrote it up.
A strong pressure gradient swept strong northwest winds across northern Johnson County on May 31. An automated sensor along Interstate 90 east of Buffalo had several wind gusts past 58 mph with a maximum gust of 65 mph. The ASOS at the Johnson County Airport in Buffalo topped-out at 61 mph and a nearby sensor reached 59 mph.
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 May 31, 5:36 AM MST, 3 hours 9 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 636 AM MDT FRI MAY 31 2013 .UPDATE...HIGH WIND WARNING ISSUED FOR NORTHEAST JOHNSON COUNTY WITH NW WINDS APPROACHING CRITERIA ACROSS INTERSTATE 90...AND INTENSIFYING TREND EXPECTED TO CONTINUE THROUGH THE MORNING AND EARLY AFTERNOON. && .PREV DISCUSSION... /ISSUED 324 AM MDT FRI MAY 31 2013/ SHORT TERM...TODAY THROUGH SUNDAY NIGHT CURRENTLY ON BACKSIDE OF REDUNDANTLY SLOW EXITING UPR LVL LOW THAT WE ARE STILL TALKING ABOUT 5 DAYS LATER. CENTER OF CIRCULATION ACCORDING TO WV IMAGERY IS OVER WRN SD THIS MORNING AND IS SCHEDULED TO FINALLY MOVE TO AROUND MN BY THIS TIME TOMORROW. UPPER LEVEL HEIGHT WILL HAVE A CHANCE TO RISE MODESTLY AND THIS WILL USHER IN A RATHER WARM AND QUIET WEEKEND PERIOD AROUND HERE FOR THE MOST PART. TONIGHT...A NARROW BAND OF LIGHT SHOWERS ARE ENDING ALONG A LINE FROM SOUTH OF JACKSON EAST TO WEST OF CASPER...WHILE RAIN AND SNOW SHOWERS CONTINUE IN THE BIG HORN MOUNTAINS. SNOW AMOUNTS OF 6 TO 12 INCHES WERE COMMON IN AREAS ABOVE 8500 FT THURSDAY...WITH ANOTHER 3 TO 6 INCHES EXPECTED THROUGH TONIGHT AT THE SAME ELEVATIONS. GFS ECMWF NAM/WRF AND UK-MET CONTINUE ANOTHER NIGHT OF CLOSE SIMILARITY THROUGH SUNDAY NIGHT...SO NO REAL CHANGES IN THINKING AND PRECIP CHANCES HANG AROUND THROUGH SATURDAY MORNING BEFORE FINALLY TAPERING OFF. WARM AND GENERALLY DRY REST OF SAT AND MOST OF SUNDAY...THE ONLY EXCEPTION BEING SMALL CHANCES FOR SHRA/TSRA LATE AFTERNOON SUNDAY OR DURING THE EVENING NEAR THE YELLOWSTONE ZONES. RIDGE BASHING SHORTWAVE COULD HAVE A FEW ISSUES GETTING TO NWRN WY WITH COMPLICATED TRAJECTORY OF THE ALEUTIAN DISTURBANCE...AND COULD END UP WITH BOTH SPATIAL AND TEMPORAL DIFFERENCES THAN CURRENTLY PAINTED. WIND WILL NOT BE BE QUITE STRONG TODAY ACROSS THE SOUTHERN 1/3RD OF THE CWA AS PG FORCES RELAX SOME IN THAT AREA...BRINGING DOWN VELOCITIES ABOUT 5-8 MPH OVERALL. HOWEVER THE FAR NERN PORTION OF THE CWA...NORTHERN JOHNSON COUNTY IN PARTICULAR...WILL SEE VERY SIMILAR CONDITIONS TO THURSDAY WITH WINDS ONCE AGAIN OUT OF THE NORTHEAST AT 30 TO 35 MPH WITH GUSTS BETWEEN 40 AND 50. WILL SPS BOTH AREAS AGAIN WITH A NEED TO WATCH FOR HIGH WIND WARNING CONDITIONS TO POSSIBLY DEVELOP FOR A PERIOD IN THE AFTERNOON IN NORTHERN JOHNSON COUNTY. LONG TERM...MONDAY THROUGH FRIDAY MAIN WEATHER MAKER DURING THE EARLY PART OF THIS PERIOD WILL BE UPPER LOW CROSSING 150W ACROSS THE NE PACIFIC EARLY THIS MORNING. THIS UPPER LOW WILL MOVE ESE ACROSS MONTANA ON MONDAY. THE GFS AND CANADIAN ARE FASTER AND FURTHER SOUTH WITH THE H5 LOW...PLACING IT OVER SE MONTANA BY 00Z TUESDAY...THE ECMWF IS FURTHER NORTH AND MUCH SLOWER WITH THE UPPER LOW MAINLY DUE TO MORE INTERACTION WITH SECONDARY SHORTWAVE DIVING DOWN BACKSIDE. GFS AND CANADIAN KEEP THIS ENERGY MORE SEPARATED. GFS AND CANADIAN OFFER THE BETTER RUN TO RUN CONSISTENCY THROUGHOUT THIS FORECAST PERIOD. 31/00Z ECMWF IS MUCH QUICKER TO BRING NEXT PACIFIC TROUGH ACROSS THE NORTHERN ROCKIES ON THURSDAY. FORECAST REFLECTS THE GFS/CANADIAN SCENARIO. AS UPPER LOW PROGRESSES ACROSS MONTANA ON MONDAY...ASSOCIATED COLD FRONT WILL PUSH SOUTH ACROSS NORTH AND EASTERN WYOMING WITH CHANCES OF SHOWERS AND THUNDERSTORMS ALONG AND NORTH OF THE FRONT...DRY AND BREEZY/WINDY CONDITIONS ACROSS SOUTHERN WYOMING...SOUTH OF THE FRONT. THIS FRONT EXPECTED TO STALL OUT ALONG THE EAST SLOPES OF THE DIVIDE MONDAY NIGHT AND TUESDAY WITH MOISTURE AND SLIGHT INSTABILITY...OR MAINLY ISOLATED SHOWERS AND THUNDERSTORMS NORTH OF THE FRONT...A DRY NW FLOW TO THE SOUTH. TUESDAY WILL BE THE COOLEST DAY DURING THIS PERIOD WITH HIGHS NORTH OF THE FRONT MOSTLY IN THE 60S ACROSS THE BASINS. HEIGHTS BUILD ACROSS THE ROCKIES WEDNESDAY AND THURSDAY WITH NEXT PACIFIC TROUGH SPLITTING ALONG THE COAST ON FRIDAY. WEAK UPSLOPE FLOW AND SLIGHT INSTABILITY WILL RESULT IN A FEW LATE DAY STORMS IN FAVORED MOUNTAIN/VALLEY CONVERGENCE ZONES. OTHERWISE...LOOK FOR WARMER TEMPERATURES WITH LOWER CENTRAL BASINS INTO THE LOWER 80S ON THURSDAY. SHOWER AND THUNDERSTORM COVERAGE FORECAST TO INCREASE ACROSS THE NORTH AND EAST ON FRIDAY AHEAD OF NEXT PACIFIC TROUGH. AVIATION.../12Z ISSUANCE/ WINDS WILL BE INCREASING AGAIN ACROSS THE LOWER ELEVATIONS THIS MORNING AND WILL BECOME WINDY IN MOST AREAS. THE NORTHERN MOUNTAINS WILL BE OBSCURED WITH SNOWFALL CONTINUING...ESPECIALLY IN THE BIGHORNS ABOVE 8000 FEET. CONDITIONS WILL SLOWLY IMPROVE TONIGHT INTO SATURDAY WITH PRECIPITATION ENDING OVER THE MOUNTAINS EXCEPT OVER THE HIGHEST PEAKS WHERE SOME FLURRIES AND MOUNTAIN OBSCURATION MAY CONTINUE. ALL AREAS WILL SEE VFR CONDITIONS WITH LESS WIND. FIRE WEATHER... CLOUDS SHOWERS POSSIBLE FOR ANOTHER DAY ACROSS THE NORTHERN FIRE ZONES...ALBEIT LESS THAN THE PREVIOUS FEW DAYS. BREEZY MOST AREAS EXCEPT WEST AND NORTHWEST ZONES WHICH WILL SEE A REPRIEVE...AND SOUTH CENTRAL AND NORTHEAST ZONE WHERE THE WINDS WILL ONCE AGAIN BLOW ABOVE 20 MPH WITH GUSTS TO 45 MPH AT TIMES. MOUNTAIN SNOW SHOWERS WILL CONTINUE ABOVE 8500 FT....VERY LIGHT IN THE HIGHER REACHES OF THE ABSAROKAS...AND QUITE A BIT HEAVIER IN THE BIG HORN MOUNTAINS WITH BLOWING AND DRIFTING CONDITIONS THERE. SAT/SUN A WARM UP BEGINS WITH QUIETER WINDS AS THE SYSTEM THAT HAS BEEN CAUSING ALL THIS INSTABILITY FINALLY DEPARTS. SMALL CHANCES FOR ISOLATED SHOWERS AND THUNDER WILL RETURN LATE SUNDAY AFTERNOON OR EVENING AS A SMALL UPPER LEVEL DISTURBANCE RIDES ITS WAY INTO THE YELLOWSTONE REGION. && .RIW WATCHES/WARNINGS/ADVISORIES... WINTER WEATHER ADVISORY UNTIL 6 AM MDT SATURDAY WYZ008-009. HIGH WIND WARNING UNTIL 9 PM MDT THIS EVENING WYZ010. && UPDATE...AEM SHORT TERM...BRAUN LONG TERM...AEM AVIATION...SKRBAC FIRE WEATHER...BRAUN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 628 AM MDT FRI MAY 31 2013 WYZ001>020-022>030-011100- 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- 628 AM MDT FRI MAY 31 2013 ...HIGH WIND WARNING FOR NORTHEAST JOHNSON COUNTY UNTIL 9 PM THIS EVENING... ...WINTER WEATHER ADVISORY FOR THE BIGHORN MOUNTAINS ABOVE 8500 FEET UNTIL 6 AM SATURDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT NORTHWEST WINDS OF 35 TO 45 MPH WITH GUSTS TO 60 MPH ARE EXPECTED ACROSS NORTHEAST JOHNSON COUNTY...ALONG INTERSTATE 90. PLEASE SEE HIGH WIND WARNING FOR MORE INFORMATION. SEVERAL MORE INCHES OF SNOW CAN BE EXPECTED TODAY AND TONIGHT OVER THE BIG HORN MOUNTAIN RANGE ABOVE 8500 FEET. PLEASE SEE WINTER WEATHER ADVISORY FOR MORE INFORMATION. SHOWERS WILL CONTINUE MAINLY ACROSS THE NORTHERN AND NORTHEAST FORECAST AREAS. BRISK WINDS ACROSS SWEETWATER COUNTY AND STRONG WINDS OVER JOHNSON COUNTY WILL CONTINUE FOR ANOTHER DAY. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY MONDAY AND TUESDAY...ISOLATED TO WIDELY SCATTERED THUNDERSTORMS ACROSS THE NORTH. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT RAIN AND SNOWFALL AMOUNTS. TEAM RIVERTON
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 626 AM MDT FRI MAY 31 2013 WYZ019-028>030-312200- EAST SWEETWATER COUNTY-FLAMING GORGE- GREEN MOUNTAINS AND RATTLESNAKE RANGE-ROCK SPRINGS AND GREEN RIVER- 626 AM MDT FRI MAY 31 2013 A LATE SEASON WINTER STORM WILL CONTINUE TO AFFECT THE REGION TODAY...WITH WINDS INCREASING ACROSS SWEETWATER COUNTY THIS MORNING THROUGH THE AFTERNOON PERIOD. WIND SPEEDS WILL RUN ABOUT 5 TO 8 MPH LESS THAN THURSDAY...BUT WILL STILL BLOW STEADY AT 20 TO 25 MPH WITH GUSTS BETWEEN 35 AND 40 MPH. AEM/BRAUN
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
The WYDOT sensor at Indian Creek recorded several wind gusts past 58 mph with a maximum gust of 65 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2013Every state in 2013This day in weather historyWarnings in Wyoming, May 2013
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: 446145.