Severe thunderstorm moved across Cheyenne County producing hailstones up to one inch in diameter. Spotter noted that nearby crops were damaged and associated wind gusts from thunderstorm knocked down two power line poles.
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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.
Severe thunderstorm moved across Cheyenne County producing hailstones up to one inch in diameter. Spotter noted that nearby crops were damaged and associated wind gusts from thunderstorm knocked down two power line poles.
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 3, 12:33 PM MST, 2 hours 57 minutes earlier.
Area Forecast Discussion National Weather Service Cheyenne WY 133 PM MDT Sat Jul 3 2021 .SHORT TERM...(This evening through Sunday) Issued at 130 PM MDT Sat Jul 3 2021 Frontal boundary laying along the Wyoming/Nebraska state line this afternoon. East of the front...dewpoints in the low 60s...while west...mid 40s are prevailing. The exception being right here at Cheyenne where an outflow boundary surged north and raised dewpoints into the mid 50s. Radar showing thunderstorms developing early today...becoming numerous down here over the south Laramie Range and Laramie County. For this afternoon...we need to be on the watch for severe thunderstorms as storms move into the Panhandle later. SPC mesoanalysis showing afternoon surface based CAPE up near 200-2500 J/KG. Outflow boundaries will provide additional shear and low level spin to aid in sustaining thunderstorms. SPC has a Slight Risk for the Panhandle that is looking better by the hour. HRRR simulated radar showing initially discreet cells...bowing out in the Panhandle by 00Z. Maybe a little less convection for Sunday...but still have moisture in place for scattered afternoon storms once again. Best day for storms still looking like Monday when an upper shortwave moves through the area. Increased PoPs over guidance as ECMWF...NAM and GFS all showing fairly widespread QPF. .LONG TERM...(Monday night through Friday) Issued at 335 AM MDT Sat Jul 3 2021 Long Range models in good agreement through next week, showing a trend towards hot temperatures by mid to late week as a strong area of high pressure aloft develops near the four corners region and lifts northeast towards Wyoming and Idaho. The coolest day will be Tuesday as showers and thunderstorms will likely persist through Monday night as a slow moving upper level trough will push southeast across the high plains. Most models show these showers continuing into early Tuesday morning with fog development likely around sunrise. High temperatures on Tuesday may be a few degrees too high in northwest flow aloft, based on model consensus and previous ensemble runs. For now, kept highs in the mid 70s to mid 80s. Again these temperatures may be 3 to 6 degrees too high, especially across the eastern plains. Started lowering POP on Tuesday afternoon and evening since most of the area should be west of the trough axis by then. However, still expect widely scatters showers and thunderstorms near the Colorado border and locations further southeast towards the trough axis. Will likely see a beginning of a weather pattern change on Wednesday as all models show the center of the 595-599dm upper level high drifting northeast towards Wyoming. Highs in the mid 80s to low 90s will be widespread with even warmer temperatures by Thursday and Friday of next week. Increasing subsidence and drier air aloft should suppress deep convection over most of the area. Can't rule out a few thunderstorms over the mountains and near the Laramie Range, so kept POP around 10 to 15 percent for these areas. Thankfully, the hot weather may be short-lived across the eastern plains with extended models showing a return to northwest flow aloft late next weekend and into next weekend. However, areas further west may still influenced by the strong 600dm upper level high over southwest Wyoming. && .AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon) Issued at 1127 AM MDT Sat Jul 3 2021 Wyoming TAFS...VFR. Thunderstorms in the vicinity at Laramie and Cheyenne from 19Z to 01Z. Wind gusts to 26 knots at all terminals until 01Z. Nebraska TAFS...VFR. Thunderstorms in the vicinity at Alliance, Scottsbluff and Sidney from 21Z to 03Z. Wind gusts to 25 knots until 03Z. && .FIRE WEATHER... Issued at 130 PM MDT Sat Jul 3 2021 Weak monsoonal moisture will remain over the area through Monday with daily chances of afternoon and evening showers and thunderstorms. Best locations for showers and storms will be along and east of the Laramie Range. Best day for wetting rains Monday as we see an upper level disturbance move through that will aid in fairly widespread showers and storms. Warming and drying mid week on into the end of the week as high pressure builds into the area. Could see critical fire weather conditions Thursday and Friday as westerly winds begin to increase and afternoon humidity becomes critical...especially west of the Laramie Range. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...None. NE...None. && SHORT TERM...GCC LONG TERM...TJT AVIATION...RUBIN FIRE WEATHER...GCC
Hazardous Weather Outlook National Weather Service Cheyenne WY 456 AM MDT Sat Jul 3 2021 NEZ002-095-096-WYZ101>103-105>108-110-112>119-041100- Dawes County-Northern Sioux County-Southern Sioux County- Converse County Lower Elevations-Niobrara County- North Laramie Range-Shirley Basin- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-North Snowy Range Foothills- 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- 456 AM MDT Sat Jul 3 2021 This hazardous weather outlook is for east central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Scattered showers and thunderstorms will develop this afternoon and move east across the high plains through this evening. Frequent lightning, brief heavy rainfall, and gusty winds are possible with these thunderstorms today. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY Afternoon showers and thunderstorms are expected each afternoon through Tuesday of next week. Thunderstorms may also linger through Sunday night and Monday night. .Spotter information statement... Spotter activation will not be required at this time. NEZ003-019>021-054-055-041100- Box Butte County-Scotts Bluff County-Banner County-Morrill County- Kimball County-Cheyenne County- 456 AM MDT Sat Jul 3 2021 This hazardous weather outlook is for the southern and central Nebraska panhandle. .DAY ONE...TODAY AND TONIGHT Scattered showers and thunderstorms will develop this afternoon and move east across western Nebraska through this evening. There is a slight chance for a few Severe Thunderstorms late this afternoon and this evening with large hail and strong gusty winds the primary hazards. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY Thunderstorms may also linger through Sunday night and Monday night. .Spotter information statement... Spotter activation will not be required at this time. WYZ104-109-111-041100- Ferris/Seminoe/Shirley Mountains-Central Carbon County- Southwest Carbon County- 456 AM MDT Sat Jul 3 2021 This hazardous weather outlook is for portions of south central Wyoming. .DAY ONE...TODAY AND TONIGHT No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY A few thunderstorms are possible this holiday weekend. Brief heavy rainfall and frequent lightning may accompany these thunderstorms in the afternoon and early evening hours. .Spotter information statement... Spotter activation will not be required.
Special Weather Statement
National Weather Service Cheyenne WY
242 PM MDT Sat Jul 3 2021
NEZ096-WYZ108-032130-
South Sioux NE-Goshen County WY-
242 PM MDT Sat Jul 3 2021
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SIOUX AND EAST
CENTRAL GOSHEN COUNTIES UNTIL 330 PM MDT...
At 242 PM MDT, Doppler radar was tracking a strong thunderstorm near
Torrington, moving east at 20 mph.
Penny size hail and wind gusts of 50 to 55 mph will be possible with
this storm.
This storm will remain over mainly rural areas of southwestern Sioux
and east central Goshen Counties.
LAT...LON 4209 10426 4224 10420 4223 10387 4201 10387
4201 10407
TIME...MOT...LOC 2042Z 280DEG 16KT 4215 10415
RubinSpecial Weather Statement National Weather Service Cheyenne WY 306 PM MDT Sat Jul 3 2021 NEZ003-096-032145- Box Butte NE-South Sioux NE- 306 PM MDT Sat Jul 3 2021 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN BOX BUTTE AND EAST CENTRAL SIOUX COUNTIES UNTIL 345 PM MDT... At 306 PM MDT, Doppler radar was tracking a strong thunderstorm over Flahertys Corner, or 32 miles northwest of Alliance. This storm was nearly stationary. Nickel size hail and wind gusts of 50 to 55 mph will be possible with this storm. This strong thunderstorm will be near... Flahertys Corner around 325 PM MDT. LAT...LON 4241 10334 4228 10328 4224 10352 4238 10351 TIME...MOT...LOC 2106Z 064DEG 3KT 4233 10343 Rubin
Special Weather Statement National Weather Service Cheyenne WY 342 PM MDT Sat Jul 3 2021 NEZ054-032230- Kimball NE- 342 PM MDT Sat Jul 3 2021 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN KIMBALL COUNTY UNTIL 430 PM MDT... At 341 PM MDT, Doppler radar was tracking a strong thunderstorm near Oliver Campground, or 11 miles west of Kimball, moving east at 20 mph. Nickel size hail and wind gusts of 50 to 55 mph will be possible with this storm. This strong thunderstorm will be near... Oliver Campground around 350 PM MDT. Oliver Reservoir around 355 PM MDT. Kimball and Kimball Airport around 415 PM MDT. Other locations impacted by this storm include Bushnell. This includes Interstate 80 in Nebraska between mile markers 4 and 23. A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for the Panhandle of Nebraska. LAT...LON 4122 10404 4138 10403 4138 10361 4103 10362 TIME...MOT...LOC 2141Z 284DEG 18KT 4126 10388 Rubin
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
344 PM MDT SAT JUL 3 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0320 PM HAIL 9 SSE TORRINGTON 41.95N 104.10W
07/03/2021 M1.00 INCH GOSHEN WY TRAINED SPOTTER
SHREDDED LEAVES.
&&
AWSpecial Weather Statement National Weather Service Cheyenne WY 351 PM MDT Sat Jul 3 2021 NEZ019-020-054-WYZ108-119-032230- Kimball NE-Scotts Bluff NE-Banner NE-Goshen County WY- East Laramie County WY- 351 PM MDT Sat Jul 3 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SCOTTS BLUFF... NORTHWESTERN KIMBALL...WESTERN BANNER...SOUTHEASTERN GOSHEN AND NORTHEASTERN LARAMIE COUNTIES UNTIL 430 PM MDT... At 351 PM MDT, Doppler radar was tracking strong thunderstorms along a line extending from near La Grange to near Meriden Rest Area. Movement was south at 25 mph. Nickel size hail and wind gusts of 50 to 55 mph will be possible with these storms. Strong thunderstorms will be near... Meriden Rest Area around 355 PM MDT. Albin around 425 PM MDT. A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for the Panhandle of Nebraska. LAT...LON 4146 10371 4118 10433 4153 10435 4185 10402 TIME...MOT...LOC 2151Z 348DEG 23KT 4165 10405 4154 10428 Rubin
Special Weather Statement
National Weather Service Cheyenne WY
357 PM MDT Sat Jul 3 2021
NEZ021-055-032245-
Cheyenne NE-Morrill NE-
357 PM MDT Sat Jul 3 2021
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CHEYENNE AND
SOUTHWESTERN MORRILL COUNTIES UNTIL 445 PM MDT...
At 357 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Redington to 11 miles southwest of Court
House And Jail Rocks to near Potter. Movement was east at 10 mph.
Nickel size hail and wind gusts of 50 to 55 mph will be possible with
these storms.
Strong thunderstorms will be near...
Court House And Jail Rocks around 435 PM MDT.
Bridgeport, Dalton, Bridgeport State Recreation Area, Northport
and The Intersection Of Highway 385 And 92 around 445 PM MDT.
This includes Interstate 80 in Nebraska between mile markers 37 and
51.
A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
the Panhandle of Nebraska.
LAT...LON 4174 10301 4146 10294 4114 10311 4120 10336
4143 10329 4166 10335
TIME...MOT...LOC 2157Z 262DEG 8KT 4160 10324 4144 10321 4127 10329
RubinThe Cheyenne radar (KCYS), 130 km away, was scanning. The volume nearest the first event began at 22:31 UTC.
1 hail. Local standard time, as filed.
Spotter noted that nearby crops were damaged and associated wind gusts from thunderstorm knocked down two power line poles.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2021Every state in 2021This day in weather historyWarnings in Nebraska, July 2021
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: 962067.