A late afternoon thunderstorm produced large hail in and near Laramie.
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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.
A late afternoon thunderstorm produced large hail in and near Laramie.
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, 3:12 PM MST, 1 hour 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 412 PM MDT SUN JUN 30 2013 .SHORT TERM...(THIS EVENING THROUGH TUESDAY NIGHT) ISSUED AT 347 PM MDT SUN JUN 30 2013 WATER VAPOR IMAGERY SHOWS THE UPPER LEVEL RIDGE CENTERED OVER NEVADA WITH THE NORTH-NORTHWEST FLOW ALOFT CONTINUING ACROSS THE CWA...VERY SIMILAR TO PREVIOUS DAYS. MIDLEVEL MOISTURE CLEARED THE REGION BY LATE THIS MORNING AND IS CURRENTLY MOVING ACROSS COLORADO WHERE CONVECTION HAS BEEN MOST WIDESPREAD...AGAIN SIMILAR TO PREVIOUS DAYS. THE MODELS CONTINUE TO SHOW WEAK INSTABILITY (500-750 J/KG OF CAPE) THROUGH THE LATE AFTERNOON AND EARLY EVENING ALONG AND WEST OF THE LARAMIE RANGE...SO ISOLATED-TO- SCATTERED SHOWERS AND TSTMS WILL REMAIN A POSSIBILITY. WITH DEEP LAYER SHEAR AROUND 35 KTS WOULD NOT RULE OUT SMALL HAIL IN ANY STRONGER STORMS. STEERING FLOW IS FROM THE NORTH SO STORMS WILL NOT MAKE IT FAR INTO THE PLAINS...WHERE INSTABILITY IS LESS ALSO. WEAK SHORTWAVE DROPS SOUTHWARD FROM THE DAKOTAS INTO THE CENTRAL PLAINS TONIGHT WITH WEAK PRESSURE RISES OVER THE PLAINS. THE GFS AND NAM BOTH HAVE LIGHT QPF LATE TONIGHT OVER THE NEBRASKA PANHANDLE...THIS IS APPARENTLY THE RESULT OF SATURATION AND WEAK LIFT IN THE 700-500MB LAYER. INCLUDED SLIGHT CHANCE OF SHOWERS OUT THERE BETWEEN 06-12Z. 700MB TEMPS DROP AROUND 2C FOR MONDAY SO SLIGHTLY COOLER CONDITIONS WILL RESULT. THERE IS WEAK INSTABILITY OVER THE CWA ONCE AGAIN DURING THE AFTN (ALBEIT LESS THAN THIS AFTN)...AND THERE MAY BE MORE MIDLEVEL CLOUD COVER THROUGH THE LATE MORNING THAT WOULD INHIBIT SFC HEATING. OVERALL...NOT TOO EXCITED ABOUT CONVECTIVE POTENTIAL GIVEN WHAT HAS OCCURRED THE PAST FEW AFTNS. NORTHERLY FLOW ALOFT CONTINUES INTO TUESDAY. LEFT TSTM CHANCES OUT OF THE FCST ON TUESDAY AFTN WITH VERY WEAK CAPE VALUES OF 100-250 J/KG PROGGED. .LONG TERM...(WEDNESDAY THROUGH SUNDAY) ISSUED AT 347 PM MDT SUN JUN 30 2013 OMEGA BLOCKING PATTERN EARLY IN THE PERIOD SHOWS SIGNS OF BREAKING DOWN BY NEXT WEEKEND. DRY NORTHERLY FLOW ON WEDNESDAY WILL BEGIN TO TURN MORE NORTHWESTERLY ON THURSDAY. THE DRY AIR MASS WILL KEEP BOTH WEDNESDAY AND THURSDAY DEEP CONVECTION FREE. LLVL THERMAL RIDGE WILL SLOWLY ADVECT EAST ON WEDNESDAY AND THURSDAY...BOOSTING H7 PROGD TEMPERATURES BACK INTO THE 14-16C RANGE. WILL SEE HIGH TEMPERATURES CONTINUE TO WARM DURING THIS PORTION OF THE FORECAST...WITH HIGHS CLIMBING WELL INTO THE 80S WITH SOME LOW 90S LIKELY. UPSTREAM UPPER RIDGE WILL BE FLATTENED FOR FRIDAY INTO NEXT WEEKEND AS SHORTWAVE ENERGY RACES ACROSS SOUTHERN CANADA. THIS WILL SUPPLY BETTER MID-LEVEL MOISTURE TO THE AREA ALONG WITH PROVIDING LIFT ALONG A WEAK COOL FROPA. HAVE INCLUDED SHOWER AND THUNDERSTORM CHANCES MAINLY OVER SOUTHEAST WYOMING ON FRIDAY SPREADING TO MOST AREAS NEXT WEEKEND. SHOULD SEE SOME BETTER CONVECTIVE ORGANIZATION NEXT WEEKEND AS MID AND UPPER-LEVEL WESTERLY INCREASE SOME TO THE NORTH OF THE FLATTENING HIGH PRESSURE. TEMPERATURES WILL CONTINUE TO REMAIN PERSISTENTLY WARM ON FRIDAY AND SATURDAY...WITH SOME SLIGHT COOLING ON SUNDAY. && .AVIATION...(FOR THE 18Z TAFS THROUGH 18Z MONDAY MORNING) ISSUED AT 1150 AM MDT SUN JUN 30 2013 VFR CONDITIONS THROUGH THE TAF PERIOD. A LAYER OF MIDLEVEL CLOUDS WITH BASES AROUND 10KFT AGL IS CURRENTLY OVER SOUTHERN SITES AND WILL CONTINUE TO MOVE SOUTH INTO COLORADO BY THE EARLY AFTERNOON. ISOLATED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE DURING THE AFTERNOON AND EVENING OVER THE WYOMING SITES...BUT NOT EXPECTING THE SHOWERS TO BE WIDESPREAD ENOUGH TO WARRANT ANYTHING OTHER THAN VICINITY STORMS. WINDS SHOULD GENERALLY BE LIGHT THROUGH THE TAF PERIOD...OUTSIDE OF ANY BRIEF GUSTY WINDS FROM STORMS. && .FIRE WEATHER... ISSUED AT 347 PM MDT SUN JUN 30 2013 FIRE WEATHER CONCERNS WILL REMAIN MINIMAL THROUGH THE MIDDLE PART OF NEXT WEEK. MINIMUM AFTERNOON HUMIDITIES WILL GENERALLY BE IN THE 20-30 PERCENT RANGE. WITH WEAK PRESSURE GRADIENTS...WINDS WILL BE GENERALLY LESS THAN 10-15 MPH. ISOLATED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ON MONDAY AFTERNOON AGAIN MAINLY ACROSS THE MOUNTAINS. TEMPERATURES WILL BEGIN TO RISE TO ABOVE NORMAL AFTER MIDWEEK. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM...FINCH LONG TERM...HAHN AVIATION...FINCH FIRE WEATHER...FINCH
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1141 AM MDT SUN JUN 30 2013 WYZ101>119-011745- 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- 1141 AM MDT SUN JUN 30 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL WYOMING... SOUTH CENTRAL WYOMING AND SOUTHEAST WYOMING. .DAY ONE...THIS AFTERNOON AND TONIGHT ISOLATED-TO-SCATTERED THUNDERSTORMS WILL DEVELOP OVER THE MOUNTAINS EARLY THIS AFTERNOON. THE STORMS WILL THEN MOVE TO THE SOUTHEAST AND CONTINUE THROUGH THE EVENING. THE STRONGER STORMS COULD PRODUCE BRIEF WIND GUSTS TO 45 MPH...A PERIOD OF MODERATE RAIN AND SMALL HAIL. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THERE WILL BE A SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS ON MONDAY. NO SEVERE STORMS ARE EXPECTED. .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>021-054-055-095-096-011745- DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- NORTH SIOUX-SOUTH SIOUX- 1141 AM MDT SUN JUN 30 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY THERE WILL BE A SLIGHT CHANCE OF AFTERNOON THUNDERSTORMS ON MONDAY. NO SEVERE STORMS ARE EXPECTED. .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 FINCH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 431 PM MDT SUN JUN 30 2013 WYZ114>116-302315- LARAMIE VALLEY WY-SNOWY RANGE WY-SOUTH LARAMIE RANGE WY- 431 PM MDT SUN JUN 30 2013 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN ALBANY COUNTY UNTIL 515 PM MDT... AT 429 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 12 MILES NORTHWEST OF LARAMIE...MOVING SOUTH AT 30 MPH. HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... LAKE HATTIE RESERVOIR... HUTTON LAKE... THIS INCLUDES INTERSTATE 80 IN WYOMING BETWEEN MILE MARKERS 294 AND 306. && LAT...LON 4108 10563 4110 10600 4144 10588 4144 10569 TIME...MOT...LOC 2231Z 005DEG 27KT 4137 10579 HAMMER
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 459 PM MDT SUN JUN 30 2013 WYZ104-109-302345- CENTRAL CARBON COUNTY WY-FERRIS/SEMINOE/SHIRLEY MOUNTAINS WY- 459 PM MDT SUN JUN 30 2013 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CARBON COUNTY UNTIL 545 PM MDT... AT 455 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 19 MILES EAST OF MUDDY GAP...OR 45 MILES NORTH OF RAWLINS...MOVING SOUTH AT 35 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... SEMINOE DAM... SEMINOE CAMPGROUND... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. && LAT...LON 4196 10668 4193 10724 4243 10720 4244 10695 TIME...MOT...LOC 2259Z 359DEG 39KT 4239 10708 HAMMER
The Cheyenne radar (KCYS), 62 km away, was scanning. The volume nearest the first event began at 23:22 UTC.
2 hail. Local standard time, as filed.
Quarter size hail was reported near Interstate 80 Exit 316 on the east side of Laramie.
Marble to quarter size hail was reported in Laramie.
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, June 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: 450102, 450104.