An afternoon thunderstorm produced large hail in southern Albany County.
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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.
An afternoon thunderstorm produced large hail in southern Albany County.
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 Aug 16, 10:09 AM MST, 2 hours 51 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 1109 AM MDT SUN AUG 16 2015 .UPDATE... ISSUED AT 1018 AM MDT SUN AUG 16 2015 UPDATED THE FCST TO INCREASE POPS ACROSS SOUTHEAST WY THROUGH THE AFTERNOON. AN AREA OF SHOWERS AND THUNDERSTORMS IS CURRENTLY MOVING INTO WESTERN CARBON COUNTY AND WILL CONTINUE MOVING EASTWARD. THE MODELS SHOW THE BEST INSTABILITY (CAPE VALUES AROUND 1000-1250 J/KG) DEVELOPING FROM THE SOUTHERN LARAMIE RANGE FOOTHILLS EASTWARD INTO LARAMIE COUNTY BY AROUND 21Z. BULK SHEAR OF 35-40 KTS WILL SUPPORT A FEW STORMS POTENTIALLY BECOMING SEVERE THROUGH THE AFTN...MAINLY IN AREAS NEAR INTERSTATE 80. && .SHORT TERM...(TODAY THROUGH TUESDAY) ISSUED AT 315 AM MDT SUN AUG 16 2015 MAIN CONCERNS TODAY AND MONDAY WILL BE FOR SOME SEVERE STORM POTENTIAL OVER PARTS OF THE CWA IN THE AFTERNOONS AND EARLY EVENINGS. CURRENT OBS SEEM TO INDICATE A MODEST COOL FRONT SAGGING SOUTHWARD ACROSS CENTRAL WY ATTM. EXPECT THIS TO CONTINUE THIS MORNING WITH THE FRONT BANKING UP AGAINST THE HIGHER TERRAIN BY THIS AFTERNOON. THIS WILL SET UP AN EASTERLY TO NORTHEASTERLY UPSLOPE FLOW AT THE SURFACE TOPPED BY WESTERLY UPPER FLOW CREATING A DECENT SHEAR PATTERN. CAPES THIS AFTERNOON FCST TO BE IN THE 1500-2500 J/KG RANGE ACROSS THE SRN PANHANDLE INTO FAR SE WY WITH MUCH LESS TO THE NORTH OF THAT AREA. THIS SHOULD CREATE A DECENT SETUP FOR A FEW STRONG TO SEVERE STORMS TODAY WITH HAIL AND STRONG WINDS THE MAIN THREATS. FARTHER TO THE NORTH...CAPPING CREATED BY THE LOW LEVEL COOLER AIR MASS MAY HINDER ACTIVITY UNTIL LATER THIS EVENING WHEN AN IMPULSE APPROACHES THE AREA. HIGH TEMPS AROUND 20 DEGREES COOLER OVER THE PLAINS TODAY. SCTD SHOWERS AND A FEW STORMS MAY PERSIST OVERNIGHT MAINLY OVER THE PANHANDLE. A SIMILAR PATTERN SEEN FOR MONDAY WITH DECENT CAPES RETURNING BACK TO MAINLY FAR SOUTHEAST WY AHEAD OF NEXT UPPER IMPULSE. HIGHER CAPES PROGGED TO BE MORE OVER EASTERN COLORADO MONDAY AND PRESENCE OF STRATUS AND A LOW LEVEL INVERSION MAY ACT TO HINDER ACTIVITY OVER THE PLAINS. A SECONDARY PUSH OF COOLER AIR SHOULD ARRIVE MONDAY NIGHT WITH RATHER COOL AND SHOWERY CONDITIONS MONDAY NIGHT AND TUESDAY. MAX TEMPS TUESDAY LIKELY HOLDING IN THE 60S OVER MUCH OF THE PLAINS. .LONG TERM...(TUESDAY NIGHT THROUGH SATURDAY) ISSUED AT 330 AM MDT SUN AUG 16 2015 THERE IS LITTLE CHANGE IN THE MEDIUM RANGE MODEL CONSENSUS SHOWING THE NORTH CENTRAL CONUS UPPER TROUGH PROGRESSING EAST ACROSS THE MS VALLEY THROUGH MIDWEEK. SCATTERED SHOWERS WILL BE ENDING TUESDAY EVENING AS A DRIER AIR MASS INFILTRATES THE REGION FROM THE NORTHWEST. THE FLOW ALOFT BACKS TO THE WEST THURSDAY AND SOUTHWEST FRIDAY WITH THE INFLUENCE OF ANOTHER UPPER TROUGH ENTERING THE PACIFIC NORTHWEST. THE ECMWF TRACK IS FURTHER SOUTH THAN THE GFS/CANADIAN WITH A CLOSED LOW MOVING ACROSS MT AND NORTHERN WY FRIDAY NIGHT/SATURDAY. IF THE ECMWF VERIFIES...MOST OF THE PRECIPITATION WILL OCCUR ACROSS THE NORTHERN HALF OF WY. MONSOON FLOW WILL BE DIVERTED WELL SOUTH OF THE CWA UNTIL THE WEEKEND WHEN ISOLATED DIURNAL CONVECTION MAY RETURN TO THE MOUNTAINS AND SOUTHEAST PLAINS. 700MB TEMPERATURES WILL BE INCREASING EACH DAY THROUGH FRIDAY...REACHING THE MID TEENS CELSIUS FRIDAY. HIGHS IN THE 70S WEDNESDAY WILL WARM INTO THE 80S THURSDAY AND FRIDAY. IT WILL BE BREEZY ALONG AND WEST OF THE LARAMIE RANGE EACH AFTERNOON WITH GUSTS APPROACHING 25 KT. A COOL FRONT IS PROGGED TO MOVE THROUGH THE CWA SATURDAY LOWERING HIGH TEMPERATURES 5 DEGREES OR SO. && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z MONDAY AFTERNOON) ISSUED AT 1104 AM MDT SUN AUG 16 2015 USED LATEST HRRR SYNTHETIC RADAR FOR EARLY TRENDS IN THE FORECAST FOR OUR AIRPORT FORECASTS. LINE OF THUNDERSTORMS CURRENTLY OVER KRWL WILL BEGIN IMPACTING KLAR AROUND 19Z OR SO AND THEN KCYS AROUND 21Z. COULD BE SEEING SOME LARGE HAIL WITH STORMS BY THE TIME THEY REACH KCYS. SOUTHERN PANHANDLE AIRPORTS TOWARDS 00Z AFFECTING KBFF AND KSNY. EASTERLY LOW LEVEL WINDS TO SET UP A FAIRLY WIDESPREAD UPSLOPE EVENT FOR AIRPORTS EAST OF THE LARAMIE RANGE. CONFIDENCE GROWING THAT THESE AIRPORTS WILL SEE IFR/LIFR CONDITIONS IN FOG/STRATUS AFTER 08-09Z...PERSISTING INTO LATE MONDAY MORNING. && .FIRE WEATHER... ISSUED AT 315 AM MDT SUN AUG 16 2015 NO CONCERNS SEEN FOR TODAY WITH NON-CRITICAL WEATHER CONDITIONS EXPECTED...THOUGH THERE WILL BE A LITTLE BREEZINESS OUT WEST THIS AFTERNOON. SOME CONCERNS ENTER THE PICTURE MONDAY AFTERNOON OVER FAR WESTERN DISTRICTS AS DRIER AIR MOVES IN ON GUSTY WESTERLY WINDS WITH MIN RH'S FALLING TO AROUND 15 PERCENT FOR A SHORT TIME MONDAY AFTERNOON. RIGHT NOW...THE THREAT LOOKS RATHER MARGINAL AND LOCALIZED. EARLY THIS WEEK SHOULD SEE CONCERNS QUITE LOW WITH COOLER TEMPERATURES RETURNING ALONG WITH DECENT CHANCES FOR RAINS OVER MOST DISTRICTS. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && UPDATE...ZF SHORT TERM...RE LONG TERM...MAJ AVIATION...GCC FIRE WEATHER...RE
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1112 AM MDT SUN AUG 16 2015 WYZ101>119-171715- 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- 1112 AM MDT SUN AUG 16 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EAST CENTRAL WYOMING...SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS WILL DEVELOP THROUGH THIS AFTERNOON OVER SOUTHEAST WYOMING. THE BEST CHANCE OF STRONG TO SEVERE STORMS WILL BE IN AREAS NEAR INTERSTATE 80 TO THE EAST OF THE LARAMIE RANGE. LARGE HAIL AND DAMAGING WINDS WILL BE THE MAIN THREAT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY SCATTERED AFTERNOON AND EVENING THUNDERSTORMS WILL DEVELOP MONDAY. SOME OF THE STORMS COULD BE SEVERE TO THE EAST OF THE LARAMIE RANGE WITH LARGE HAIL AND DAMAGING WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON IN AREAS NEAR INTERSTATE 80 TO THE EAST OF THE LARAMIE RANGE. NEZ002-003-019>021-054-055-095-096-171715- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX- 1112 AM MDT SUN AUG 16 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN NEBRASKA. SCATTERED AFTERNOON AND EVENING THUNDERSTORMS WILL DEVELOP MONDAY. SOME OF THE STORMS COULD BE SEVERE WITH LARGE HAIL AND DAMAGING WINDS. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS WILL DEVELOP BY LATE THIS AFTERNOON AND DURING THE EVENING OVER THE NEBRASKA PANHANDLE. BRIEF HEAVY RAIN AND GUSTY WINDS WILL BE POSSIBLE WITH THE STRONGER STORMS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY SCATTERED AFTERNOON AND EVENING THUNDERSTORMS WILL DEVELOP MONDAY. SOME OF THE STORMS COULD BE SEVERE WITH LARGE HAIL AND DAMAGING WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE REQUIRED.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1209 PM MDT SUN AUG 16 2015 WYZ105-106-110-112>117-161915- CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY WY- SOUTH LARAMIE RANGE FOOTHILLS WY-SOUTH LARAMIE RANGE WY- NORTH SNOWY RANGE FOOTHILLS WY-SHIRLEY BASIN WY- SIERRA MADRE RANGE WY-SNOWY RANGE WY-LARAMIE VALLEY WY- UPPER NORTH PLATTE RIVER BASIN WY- 1209 PM MDT SUN AUG 16 2015 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN LARAMIE...SOUTHERN ALBANY...SOUTHEASTERN CARBON AND SOUTHWESTERN PLATTE COUNTIES UNTIL 115 PM MDT... AT 1207 PM MDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR ROCK RIVER TO 8 MILES SOUTHEAST OF HOG PARK CAMPGROUND...AND MOVING EAST AT 30 MPH. HALF INCH HAIL AND WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THESE STORMS. LOCATIONS IMPACTED INCLUDE... LARAMIE...ALBANY...ROCK RIVER...BOBBIE THOMPSON CAMPGROUND...FRENCH CREEK CAMPGROUND...CENTENNIAL...WOODS LANDING-JELM...LAKE OWEN CAMPGROUND...SUGAR LOAF CAMPGROUND...BROOKLYN LAKE...DEEP CREEK CAMPGROUND...BOSLER...BROOKLYN LAKE CAMPGROUND...EVANS CREEK CAMPGROUND...BALDY PEAK...ROB ROY RESERVOIR...ILLINOIS CREEK CAMPGROUND...LIBBY CREEK CAMPGROUND...NORTH FORK CAMPGROUND AND SIX MILE CAMPGROUND. THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 274 AND 315. LAT...LON 4101 10675 4184 10595 4180 10505 4100 10584 TIME...MOT...LOC 1807Z 278DEG 26KT 4178 10595 4098 10672 FINCH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 140 PM MDT SUN AUG 16 2015 WYZ106>108-116>118-162030- CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY WY- SOUTH LARAMIE RANGE FOOTHILLS WY-SOUTH LARAMIE RANGE WY- EAST PLATTE COUNTY WY-CENTRAL LARAMIE COUNTY WY-GOSHEN COUNTY WY- 140 PM MDT SUN AUG 16 2015 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN LARAMIE...SOUTHWESTERN GOSHEN...SOUTHEASTERN ALBANY AND SOUTHERN PLATTE COUNTIES UNTIL 230 PM MDT... AT 140 PM MDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR IRON MOUNTAIN TO NEAR NORTH CROW CAMPGROUND TO 9 MILES SOUTHWEST OF PUMPKIN VINE...AND MOVING EAST AT 30 MPH. HALF INCH HAIL AND WIND GUSTS OF 50 TO 55 MPH WILL BE POSSIBLE WITH THESE STORMS. LOCATIONS IMPACTED INCLUDE... CHEYENNE...CHUGWATER...IRON MOUNTAIN...GRANITE SPRINGS CAMPGROUND... VEDAUWOO CAMPGROUND...CRYSTAL LAKE RESERVOIR...FEDERAL...TIE SIDING...SOUTH GREELEY...YELLOW PINE CAMPGROUND...WHITAKER...CRYSTAL LAKE CAMPGROUND...HORSE CREEK...NORTH CROW CAMPGROUND...FRONTIER PARK...PUMPKIN VINE...GRANITE SPRINGS RESERVOIR...TIE CITY CAMPGROUND...WARREN AFB AND RANCHETTES. THIS INCLUDES THE FOLLOWING HIGHWAYS... INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 1 AND 59. INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 321 AND 363. 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. TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN CHEYENNE. && LAT...LON 4169 10532 4185 10463 4100 10481 4100 10555 TIME...MOT...LOC 1940Z 277DEG 24KT 4162 10528 4126 10523 4094 10555 CLAYCOMB
The Cheyenne radar (KCYS), 55 km away, was scanning. The volume nearest the first event began at 20:00 UTC.
1 hail. Local standard time, as filed.
Marble to quarter size hail was observed two miles south of Pumpkin Vine Road and one mile east of US Highway 287.
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, August 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: 588963.