Severe thunderstorm on the 1st produced severe hail near Bridgeport and wind gusts of 66 MPH near Alliance. Received numerous reports of cars with cracked windshields due to hail along US Highway 26 between Bridgeport and Scottsbluff.
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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 on the 1st produced severe hail near Bridgeport and wind gusts of 66 MPH near Alliance. Received numerous reports of cars with cracked windshields due to hail along US Highway 26 between Bridgeport and Scottsbluff.
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 Sep 1, 1:55 PM MST, 2 hours 10 minutes earlier.
Area Forecast Discussion National Weather Service Cheyenne WY 255 PM MDT Wed Sep 1 2021 .SHORT TERM...(This evening through Thursday) Issued at 217 PM MDT Wed Sep 1 2021 The short term forecast remains on-track through this afternoon and evening. A subtropical moisture surge continues to move northward through the central Rockies. Light to moderate rainfall has developed over northern ranges of Colorado and is now making its way into southern Wyoming. Forecast guidance remains locked in showing around 0.25 to 0.5 inches of rain for this event across most of the forecast area. Stronger thunderstorms are still expected to develop over western Nebraska this afternoon as wind fields turn southeasterly advecting surface moisture northward. CAM guidance has favored one or two supercells forming in the BFF vicinity and transitioning into perhaps a bowing segment moving rapidly northeastward this evening. Most of this stronger activity should exit north of the Nebraska border by 2-4z, leaving general scattered showers and stratiform rain over the forecast region for the remainder of the evening. Downsloping and NVA should eradicate most of the precipitation after 6-9z tonight, leaving a mainly dry early morning on Thursday. The expectation for Thursday has transitioned to a drier forecast, with light west to southwest flow in place. A few isolated showers and possibly a thunderstorm or two could develop over the higher terrain given a bit of leftover elevated moisture, however PoP chances have been greatly reduced from prior forecasts. Temperatures will remain near or below average through the period given abundant cloud cover and precipitation. .LONG TERM...(Thursday night through Wednesday) Issued at 217 PM MDT Wed Sep 1 2021 The next weather system will move through on Friday. This system will come in the form of a weak trough aloft. Some moisture return along the leading edge of this system will result in a threat for showers and thunderstorms during the afternoon hours. The latest ECMWF is particularly bullish with this threat, with as much as a quarter of an inch of rain possible over the panhandle of Nebraska. Zonal flow behind this system will gradually transition to ridging over the western CONUS by the end of the weekend into early next week. The only other forecast challenge in the long term is the potential for elevated winds on Saturday and Sunday. Given drying in the lower levels, Red Flag conditions may return to portions of the higher terrain in southeast Wyoming. Dry and benign weather is expected from early through the middle of next week. && .AVIATION...(For the 18Z TAFS through 18Z Thursday afternoon) Issued at 1125 AM MDT Wed Sep 1 2021 VFR conditions expected to continue across southeast Wyoming and the Nebraska panhandle over the next few hours. KRWL has started to receive rain showers, which will propagate eastward toward KLAR, KCYS, and into the Nebraska panhandle through the evening into overnight hours. Timing for when the showers will end is still uncertain, but it should be in the early tomorrow morning hours. In addition, thunderstorms are possible in the Nebraska panhandle generally between 00Z and 06Z, with showers continuing into early morning hours. Strong, gusty winds are possible in the outflow boundaries of the thunderstorms, as well as MVFR ceilings. && .FIRE WEATHER... Issued at 217 PM MDT Wed Sep 1 2021 Expect minimal fire weather concerns over the next few days. Showers and thunderstorms will result in higher RH values from today through Thursday as a push of moisture moves through. Another weather system will move through on Friday bringing a chance of showers and thunderstorms especially over southeast Wyoming. Expect drying by the weekend. Stronger winds may result in borderline Red Flag conditions returning by Saturday or Sunday. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...None. NE...None. && SHORT TERM...TCYS LONG TERM...TCYS AVIATION...LK FIRE WEATHER...MAC
Hazardous Weather Outlook National Weather Service Cheyenne WY 605 AM MDT Wed Sep 1 2021 WYZ103>106-109>117-021215- North Laramie Range-Ferris/Seminoe/Shirley Mountains- Shirley Basin-Central Laramie Range and Southwest Platte 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- 605 AM MDT Wed Sep 1 2021 This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Scattered to numerous showers and a few thunderstorms are expected along and west of the Laramie Range today and tonight. Locally heavy rainfall is possible. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation will not be needed. WYZ101-102-107-108-118-119-021215- Converse County Lower Elevations-Niobrara County- East Platte County-Goshen County-Central Laramie County- East Laramie County- 605 AM MDT Wed Sep 1 2021 This hazardous weather outlook is for portions of east central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Scattered showers and thunderstorms are possible today and tonight across much of southeast Wyoming. Severe storms are not expected, but locally heavy rainfall will be possible with some storms. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY Another round of showers and thunderstorms will be possible on Friday and Friday night. .Spotter information statement... Spotter activation will not be needed. NEZ002-003-019>021-054-055-095-096-021215- Dawes County-Box Butte County-Scotts Bluff County-Banner County- Morrill County-Kimball County-Cheyenne County- Northern Sioux County-Southern Sioux County- 605 AM MDT Wed Sep 1 2021 This hazardous weather outlook is for portions of panhandle Nebraska. .DAY ONE...TODAY AND TONIGHT Isolated showers and thunderstorms are possible across the western Nebraska Panhandle this afternoon and evening, mainly after 3 PM MDT. A few strong to severe storms are possible with damaging winds to 60 MPH, quarter size hail and heavy rainfall the primary hazards. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY Another round of showers and thunderstorms will be possible on Friday and Friday night. .Spotter information statement... Spotters are encouraged to report significant weather to the National Weather Service in Cheyenne.
Special Weather Statement
National Weather Service Cheyenne WY
438 PM MDT Wed Sep 1 2021
NEZ019>021-012315-
Scotts Bluff NE-Morrill NE-Banner NE-
438 PM MDT Wed Sep 1 2021
...A strong thunderstorm will impact portions of southeastern Scotts
Bluff, southwestern Morrill and northeastern Banner Counties through
515 PM MDT...
At 438 PM MDT, Doppler radar was tracking a strong thunderstorm over
Redington, or 26 miles southeast of Scottsbluff, moving north at 25
mph.
HAZARD...Winds in excess of 40 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Locations impacted include...
Bayard, Minatare, Chimney Rock State Park, Moomaws Corner, Redington,
South Bayard Junction and McGrew.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4153 10317 4151 10341 4186 10352 4188 10316
TIME...MOT...LOC 2238Z 174DEG 21KT 4160 10331
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
MokryPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
448 PM MDT WED SEP 1 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0445 PM HAIL 1 SE REDINGTON 41.58N 103.29W
09/01/2021 M0.50 INCH MORRILL NE TRAINED SPOTTER
&&
WMThe Cheyenne radar (KCYS), 144 km away, was scanning. The volume nearest the first event began at 23:03 UTC.
3 hail, 1 thunderstorm wind. Local standard time, as filed.
Received reports of cracked windshields due to hail along US Highway 26 between Bridgeport and Scottsbluff. Estimated golf ball sized hail based on damage. Time estimated based on radar.
Received reports and photos of cracked windshields east of Bayard. Estimated golf ball sized hail based on damage.
ASOS station KAIA - Alliance Airport 5 miles southeast of Alliance reported wind gust.
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, September 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: 977495, 977496, 977497, 977498.