Late afternoon thunderstorms over southern Albany County produced strong wind gusts.
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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 CYS wrote it up.
Late afternoon thunderstorms over southern Albany County produced strong wind gusts.
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 Jun 30, 1:30 PM MST, 3 hours 8 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 230 PM MDT TUE JUN 30 2015 .SHORT TERM...(THIS EVENING THROUGH THURSDAY NIGHT) ISSUED AT 230 PM MDT TUE JUN 30 2015 SURFACE ANALYSIS SHOWING A FRONTAL BOUNDARY OVER WESTERN SOUTH DAKOTA...EXTENDING INTO EXTREME NORTHEASTERN WYOMING EARLY THIS AFTERNOON. RADAR SHOWING SOME SHOWERS DEVELOPING OVER THE NORTH LARAMIE RANGE THIS AFTERNOON. LAPRELLE CREEK AND WINDY PEAK SNOTELS SHOWING SOME PRETTY GOOD RAINFALL AMOUNTS IN THE NORTH LARAMIE RANGE. BUT OUTSIDE THIS AREA...IT STILL LOOKS LIKE ECHOES ARE ELEVATED. 1PM HUMIDITY AT CHEYENNE AT 19 PERCENT...DOUGLAS AT 24 PERCENT...LARAMIE 21 PERCENT...SO THESE ECHOES ARE GOING TO TAKE QUITE A WHILE TO REACH THE GROUND. SO FOR THIS AFTERNOON...THINK MOST PLACES WILL REMAIN DRY UNTIL THE LATE AFTERNOON HOURS. LATEST SPC MESOANALYSIS SHOWING AROUND 500J/KG CAPE ACROSS SOUTHERN WYOMING. NIOBRARA COUNTY AND THE PANHANDLE JUST LOST THEIR CAP OUT THAT WAY WITH CAPE VALUES AROUND 1000J/KG. JUST NORTH OF THE PANHANDLE NEAR THE FRONT...SURFACE BASED CAPES OF 2500 TO 3500 J/KG EXISTS. LOOKS LIKE THE SLIGHT RISK AREA IS STILL HOLDING GOOD UP THAT WAY. LATEST HRRR SIMULATED RADAR SHOWS INCREASING AREA OF SHOWERS AND THUNDERSTORMS MOVING SOUTHEAST LATE THIS AFTERNOON THAT MOVE INTO THE PANHANDLE THROUGH THE EARLY EVENING HOURS. CONTINUE THE CHANCE POP FORECAST FOR THIS AFTERNOON WITH SMALL HAIL AND GUSTY WINDS. COULD SEE A COUPLE SEVERE STORMS MOVE INTO THE NORTHERN PANHANDLE FROM WESTERN SOUTH DAKOTA/NORTHEASTERN WYOMING. OVERALL THOUGH...DO THINK CHANCES WILL BE LOW. BETTER CHANCES APPEAR FOR WEDNESDAY AFTERNOON FOR LOCATIONS ALONG THE INTERSTATE 80 CORRIDOR AS THE FRONT STALLS ALONG THE LARAMIE RANGE. THIS IS DEPICTED ON THE ECMWF. GFS HAS FRONT FURTHER EAST IN NEBRASKA. DUE TO THE DIFFERENCES...DI NOT CHANGE POPS TOO MUCH FOR WEDNESDAY WITH CHANCE POPS. DID INCREASE POPS FOR THE PANHANDLE WEDNESDAY NIGHT INTO THURSDAY MORNING. ECMWF SHOWING FRONT LIFTING ENE INTO WESTERN NEBRASKA. NAM SOUNDINGS FOR THE PANHANDLE SHOWING PWATS ALMOST TO 1.3 INCHES WITH LONG/SKINNY CAPE PROFILES. GOOD NEWS IS FORECAST STORM MOTIONS ARE FAIRLY HIGH...SO DO THINK WE ARE OK FOR POSSIBLE HEAVY RAIN THREAT DURING THAT TIME. .LONG TERM...(FRIDAY THROUGH TUESDAY) ISSUED AT 230 PM MDT TUE JUN 30 2015 ELONGATED UPPER RIDGE WILL HOLD ACROSS THE SW CONUS THIS PERIOD WITH A GENERALLY NWLY FLOW ALOFT OVER THE CWA ON THE NORTHEAST PERIPHERY OF THE UPPER HIGH. MAINLY DRY CONDITIONS ARE EXPECTED FRIDAY THROUGH THE WEEKEND THOUGH BY SUNDAY INTO EARLY NEXT WEEK CONVECTION SHOULD INCREASE AS BETTER MOISTURE ADVECTS INTO THE REGION FROM THE SW. A COOL FRONT IS EXPECTED TO PASS ACROSS SUNDAY BRINGING A MODEST COOL DOWN INTO MONDAY BEFORE TEMPS REBOUND TUESDAY. POST FRONTAL UPSLOPE PATTERN SHOULD HELP PCPN CHANCES MONDAY WITH CHANCES FOR SHOWERS AND TSTMS CONTINUING TUESDAY. && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z WEDNESDAY AFTERNOON) ISSUED AT 1115 AM MDT TUE JUN 30 2015 VFR CONDITIONS WILL PREVAIL...EXCEPT FOR SOME BRIEF MVFR VISIBILITIES IN WIDELY SCATTERED AFTERNOON/EVENING SHOWERS/TSTORMS MAINLY AFFECTING SE WY TERMINALS THIS AFTERNOON INTO EARLY EVENING. && .FIRE WEATHER... ISSUED AT 230 PM MDT TUE JUN 30 2015 NORTH LARAMIE RANGE SEEING WETTING RAINS EARLY THIS AFTERNOON WITH SHOWERS AND THUNDERSTORMS MOVING SOUTHEAST ALONG A FRONTAL BOUNDARY MOVING INTO THE AREA FROM THE NORTH. FOR AREAS EAST OF THE LARAMIE RANGE...IT WILL TAKE SOME TIME FOR SHOWERS TO REACH THE GROUND AS AFTERNOON HUMIDITIES QUITE LOW. EVENTUALLY THOUGH...MUCH OF SOUTHERN WYOMING AND SOUTHERN NEBRASKA PANHANDLE SHOULD SEE WETTING RAINS LATE AFTERNOON THROUGH EARLY EVENING. BETTER CHANCES WEDNESDAY AFTERNOON AS THE FRONT STALLS ALONG THE EAST SLOPES OF THE LARAMIE RANGE. NO FIRE WEATHER CONCERNS THROUGH THE WEEK AS AFTERNOON HUMIDITIES SHOULD REMAIN ABOVE CRITICAL LEVELS AND FUELS ARE GREEN. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM...GCC LONG TERM...RE AVIATION...RE FIRE WEATHER...GCC
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 336 AM MDT TUE JUN 30 2015 NEZ002-003-019>021-054-055-095-096-WYZ101>119-010945- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX-CONVERSE COUNTY LOWER ELEVATIONS- NIOBRARA COUNTY-NORTH LARAMIE RANGE- FERRIS/SEMINOE/SHIRLEY MOUNTAINS-SHIRLEY BASIN- CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY- EAST PLATTE COUNTY-GOSHEN COUNTY-CENTRAL CARBON COUNTY- NORTH SNOWY RANGE FOOTHILLS-SOUTHWEST CARBON COUNTY- SIERRA MADRE RANGE-UPPER NORTH PLATTE RIVER BASIN-SNOWY RANGE- LARAMIE VALLEY-SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS- CENTRAL LARAMIE COUNTY-EAST LARAMIE COUNTY- 336 AM MDT TUE JUN 30 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN NEBRASKA...EAST CENTRAL WYOMING...SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL DEVELOP THIS AFTERNOON WITH THE PASSAGE OF A COOL FRONT AND UPPER LEVEL DISTURBANCE. THUNDERSTORMS WILL LINGER INTO THE LATE EVENING BEFORE ENDING. SOME OF THE THUNDERSTORMS MAY BECOME STRONG WITH GUSTY WINDS AND SMALL HAIL. AN ISOLATED SEVERE THUNDERSTORM OR TWO PRODUCING ONE INCH HAIL AND WIND GUSTS IN EXCESS OF 58 MPH IS ALSO POSSIBLE OVER THE PLAINS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY ISOLATED TO SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE FORECAST WEDNESDAY AND THURSDAY. A FEW STRONG THUNDERSTORMS WILL BE POSSIBLE ACROSS THE PLAINS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE REQUIRED TODAY AND TONIGHT.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 431 PM MDT TUE JUN 30 2015 WYZ105-106-110-114-115-302315- CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY WY- NORTH SNOWY RANGE FOOTHILLS WY-SHIRLEY BASIN WY-SNOWY RANGE WY- LARAMIE VALLEY WY- 431 PM MDT TUE JUN 30 2015 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL ALBANY AND EAST CENTRAL CARBON COUNTIES UNTIL 515 PM MDT... AT 430 PM MDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES EAST OF MEDICINE BOW TO NEAR ARLINGTON...AND MOVING SOUTHEAST AT 35 MPH. WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THESE STORMS. LOCATIONS IMPACTED INCLUDE... ROCK RIVER...BOSLER AND ARLINGTON. THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 267 AND 302. PRECAUTIONARY/PREPAREDNESS ACTIONS... FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS. LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE SHELTER INSIDE A BUILDING OR VEHICLE. THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. && LAT...LON 4178 10545 4125 10582 4156 10636 4197 10607 TIME...MOT...LOC 2230Z 301DEG 29KT 4189 10606 4160 10626 MAZUR
The Cheyenne radar (KCYS), 62 km away, was scanning. The volume nearest the first event began at 23:38 UTC.
3 thunderstorm wind. Local standard time, as filed.
Estimated wind gusts of 55 to 60 mph were observed eight miles northeast of Laramie.
Estimated wind gusts of 55 to 60 mph were observed 10 miles east-southeast of Laramie.
Estimated wind gusts of 55 to 60 mph were observed eight miles northeast of Vedauwoo.
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, June 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: 586147, 586149, 586151.