Late afternoon and early evening thunderstorms produced large hail in Platte County and a tornado in Laramie County.
Every event with a place to put it. 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.
Late afternoon and early evening thunderstorms produced large hail in Platte County and a tornado in Laramie 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 Jul 29, 2:29 PM MST, 1 hour 6 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 329 PM MDT MON JUL 29 2013 .SHORT TERM...(THIS EVENING THROUGH WEDNESDAY) ISSUED AT 243 PM MDT MON JUL 29 2013 SHOWERS AND THUNDERSTORMS HAVE AGAIN DEVELOPED THIS AFTERNOON. THE RISK OF SEVERE STORMS IS LOW BUT NOT 100 PERCENT OUT OF THE QUESTION. LATEST MESO ANALYSIS FROM SPC SHOWING 1000-2000 J/KG MOST UNSTABLE CAPE WITH 30-35 KTS OF 0-6 KM SHEAR. THIS IS CERTAINLY ENOUGH FOR A FEW ISOLATED SEVERE THUNDERSTORMS BUT THE OVERALL THREAT IS LOW. MAIN CONCERN WITH ANY LARGER STORMS WOULD BE FOR MARGINAL SEVERE SIZED HAIL. THE OTHER CONCERN TONIGHT IS THIS POTENTIAL FOR LOCALLY HEAVY RAIN INTO THE MOUNTAIN THROUGH THIS EVENING. SHOWERS AND THUNDERSTORMS HAVE ALREADY DEVELOPED OVER THE SNOWY AND SIERRA RANGE AHEAD OF A SHORTWAVE OVER NORTHERN UTAH. SHORTWAVE WILL CONTINUE ON ITS EAST- NORTHEAST TRACK TONIGHT...MOVING ALONG THE WYOMING/COLORADO BORDER. SHOULD SHOWERS AND THUNDERSTORMS TRAIN OVER BURN SCARS...FLASH FLOODING COULD BECOME POSSIBLE. SHOWERS AND THUNDERSTORMS WILL BECOME LESS NUMEROUS AFTER MIDNIGHT WITH THE LOSS OF LOW LEVEL INSTABILITY. MOST ACTIVITY SHOULD END BY LATE TONIGHT. SLIGHTLY DRIER UNDER WESTERLY FLOW ALOFT WILL BRING WARMER TEMPERATURES TOMORROW WITH LESSER CHANCES FOR THUNDERSTORMS TO MOST OF THE AREA. MAINLY EXPECTING ISOLATED THUNDERSTORMS DURING THE AFTERNOON WITH THE SEVERE THREAT VERY LOW. HIGHER CAPE VALUES SHOULD BE WELL EAST OF THE CWA SHOULD THE NAM VERIFY. SHOULD BE GARDEN VARIETY SHOWERS AND THUNDERSTORMS IN THE AFTERNOON AND EVENING. ISOLATED SHOWERS COULD LINGER INTO THE TUESDAY NIGHT AS A FRONTAL BOUNDARY MOVES THROUGH THE AREA. THIS BOUNDARY WITH LOW LEVEL COOLING WILL COMBINE WITH UPPER LEVEL RIDGING AND WARM AIR ALOFT WEDNESDAY TO MAINLY KEEP SHOWERS AND THUNDERSTORMS AT BAY WITH A CAP IN PLACE. LONG TERM...(WEDNESDAY NIGHT THROUGH MONDAY) ISSUED AT 300 PM MDT MON JUL 29 2013 MINOR CHANGES ANTICIPATED THROUGH THIS PERIOD WITH THE PATTERN FEATURING AN UPPER RIDGE WAVERING ALONG OR JUST EAST OF THE ROCKY MTNS. MONSOONAL MOISTURE WILL PERSIST OVER THE AREA THUS WIDELY SCATTERED MAINLY AFTERNOON AND EVENING SHOWERS AND STORMS WILL ALSO PERSIST...SOME DAYS A LITTLE MORE NUMEROUS THAN OTHER DUE TO WEAK HARD-TO-DISCERN IMPULSES MOVING ACROSS. LITTLE CHANGE IN TEMPERATURES LIKEWISE. SOME STRONGER STORMS MAY OCCUR OVER THE PLAINS THURSDAY AND FRIDAY AS INSTABILITY INCREASES SOME. && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z TUESDAY MORNING) ISSUED AT 1127 AM MDT MON JUL 29 2013 MVFR CONDITIONS WILL CONTINUE INTO THIS AFTERNOON OVER MUCH OF THE NEBRASKA PANHANDLE WITH SLOW IMPROVEMENT. WIDELY SCATTERED SHOWERS AND TSTMS DEVELOPING ALONG THE LARAMIE RANGE BY MID-AFTN SHOULD THEN SPREAD EASTWARD OVER THE PLAINS THROUGH THE EVENING BEFORE ENDING. && .FIRE WEATHER... ISSUED AT 243 PM MDT MON JUL 29 2013 ACTIVE WEATHER PATTERN WILL CONTINUE THROUGH THIS WEEK SO MINIMAL FIRE WEATHER CONCERNS. WINDS WILL GENERALLY BE LIGHT SIDE AND HUMIDITIES ON THE HIGH SIDE. THE ONE EXCEPTION WILL BE TUESDAY AFTERNOON OVER CARBON COUNTY WHERE MARGINAL RED FLAG CONDITIONS WILL BE POSSIBLE IN LOWER ELEVATIONS FOR A BRIEF PERIOD OF TIME. OTHERWISE EXPECTING ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS NEARLY EVERY DAY THIS WEEK. THE MAIN CHANCES WILL BE IN THE AFTERNOON AND EVENING BUT SOME OVERNIGHT PRECIPITATION WILL BE POSSIBLE A FEW NIGHTS. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM...LIEBL LONG TERM...RE AVIATION...RE FIRE WEATHER...LIEBL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 300 PM MDT MON JUL 29 2013 WYZ101>119-301215- 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- 300 PM MDT MON JUL 29 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL WYOMING... SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS WILL BE FOUND OVER SOUTHEAST WYOMING THIS AFTERNOON AND EVENING. SEVERE STORMS GENERALLY ARE NOT EXPECTED...HOWEVER A FEW SEVERE THUNDERSTORM ARE NOT OUT OF THE QUESTION EAST OF THE LARAMIE RANGE WITH HAIL TO THE SIZE OF QUARTERS BEING THE MAIN THREAT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE EACH AFTERNOON AND EVENING MAINLY ALONG AND EAST OF THE LARAMIE RANGE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE REQUIRED THROUGH TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE NEZ002-003-019>021-054-055-095-096-301215- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX- 300 PM MDT MON JUL 29 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS WILL BE FOUND OVER SOUTHEAST WYOMING THIS AFTERNOON AND EVENING. SEVERE STORMS GENERALLY ARE NOT EXPECTED...ALTHOUGH A FEW SEVERE THUNDERSTORM ARE NOT OUT OF THE QUESTION WITH HAIL TO THE SIZE OF QUARTERS BEING THE MAIN THREAT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE EACH AFTERNOON AND EVENING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE REQUIRED THROUGH TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE LIEBL
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 406 PM MDT MON JUL 29 2013 WYZ106-107-292245- CENTRAL LARAMIE RANGE AND SOUTHWEST PLATTE COUNTY WY-EAST PLATTE COUNTY WY- 406 PM MDT MON JUL 29 2013 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PLATTE COUNTY UNTIL 445 PM MDT... AT 404 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8 MILES NORTH OF WHEATLAND...MOVING EAST AT 15 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... WHEATLAND... GRAYROCKS RESERVOIR... THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 78 AND 94. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. && LAT...LON 4225 10467 4192 10467 4209 10516 4227 10512 TIME...MOT...LOC 2206Z 279DEG 14KT 4216 10501 TJT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 422 PM MDT MON JUL 29 2013 WYZ107-108-118-119-292300- CENTRAL LARAMIE COUNTY WY-EAST LARAMIE COUNTY WY-EAST PLATTE COUNTY WY-GOSHEN COUNTY WY- 422 PM MDT MON JUL 29 2013 ...SIGNIFICANT WEATHER ADVISORY FOR EXTREME SOUTHEASTERN PLATTE... NORTHERN LARAMIE AND EXTREME SOUTHWESTERN GOSHEN COUNTIES UNTIL 500 PM MDT... AT 418 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 12 MILES SOUTHEAST OF CHUGWATER...OR 32 MILES NORTH OF CHEYENNE...MOVING SOUTHEAST AT 15 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... MAINLY RURAL AREAS OF EXTREME SOUTHWESTERN GOSHEN AND NORTHERN LARAMIE COUNTIES. THIS STORM 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. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. && LAT...LON 4151 10441 4132 10456 4158 10487 4168 10475 TIME...MOT...LOC 2222Z 307DEG 12KT 4160 10470 TJT
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
433 PM MDT MON JUL 29 2013
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0430 PM HAIL 11 N WHEATLAND 42.21N 104.96W
07/29/2013 E0.50 INCH PLATTE WY LAW ENFORCEMENT
&&
DDEALThe Cheyenne radar (KCYS), 119 km away, was scanning. The volume nearest the first event began at 22:36 UTC.
2 hail, 1 tornado. Local standard time, as filed.
Quarter size hail covering the ground near Interstate 25 mile marker 91 north of Wheatland.
Quarter size hail was reported just north of Guernsey.
A weak tornado touched down in open country three miles east of Federal and moved slowly southeast. There were several reports of ground debris observed with the tornado. A tornado lifted a few minutes after it crossed Highway 218. No damage was reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wyoming in 2013Every state in 2013This day in weather historyThe tornado archive for Wyoming, 2013Warnings in Wyoming, July 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: 457235, 457236, 457237.