Severe thunderstorm moved across Banner County knocking down several power poles resulting in widespread power outages to area residents.
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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 Banner County knocking down several power poles resulting in widespread power outages to area residents.
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 8, 4:13 PM MST, 4 hours 19 minutes earlier.
Area Forecast Discussion National Weather Service Cheyenne WY 513 PM MDT Tue Jun 8 2021 .SHORT TERM...(Tonight - Thursday Night) Issued at 227 PM MDT Tue Jun 8 2021 A very strong cap remains evident across much of southeast Wyoming and the western Nebraska Panhandle this afternoon w/ quite limited cumulus development thus far. We should start to see an increasing low-level cumulus field in the next couple of hours as we approach our convective temperatures, but w/ upwards of 50 J/kg MLCIN still present the likelihood of afternoon initiation appears low. HRRR & other high-resolution guidance have continued to suggest some more robust development between 00 and 02z along the lee trough/dryline or roughly along I-25. Deep layer vertical shear is very modest at around 20 knots over most of the area, but area forecast soundings show appreciable low-level directional shear which would suggest a good possibility of upscale growth into a linear system across the western NE Panhandle during the mid/late evening. Substantial low- level mixing has occurred today w/ dew points falling to around 50 F although some 60s still linger over our far eastern zones. CAPEs in excess of 2000 J/kg will support a large & damaging hail threat with any discrete storms. Otherwise, extremely steep low/mid level lapse rates and large boundary layer T/Td spreads, along w/ DCAPEs of 1500-2000 J/kg will support a threat for damaging straight line winds with the eventual MCS. Lingering outflow from Mondays storms could locally enhance low-level shear & contribute to a chance for an isolated tornado if the quality of moisture is sufficient. This is especially true along a Wheatland-Sidney line. A brief period of upper-level ridging should limit chances for any storms on Wednesday, but the next chance for strong/severe thunder storms will arrive Thursday as a vigorous short wave ejects north- northeast across the Great Basin. Increasingly difluent flow aloft should overspread the area, leading to an eroding cap & initiation by late afternoon. Timing will be crucial here w/ regard to severe potential, but very steep mid-level lapse rates & dew points 55-65 deg F may contribute to CAPE in excess of 3000 J/kg to the east of the lee trough/dryline while 0-6 km shear should be very strong at 35-45+ knots. All modes of severe weather would be possible. Would not be surprised if the current Day 3 SLGT is expanded further S & W in later updates. .LONG TERM...(Friday through Monday) Issued at 345 AM MDT Tue Jun 8 2021 Shortwave trough quickly exits northeast of the CWA by Friday morning, followed by an expanding upper ridge over much of the CONUS through early next week. Large scale subsidence and lack of moisture will preclude convective precipitation through the long term. Near normal temperatures Friday will warm to above normal with 80s and 90s this weekend. && .AVIATION...(For the 00Z TAFS through 00Z Wednesday evening) Issued at 507 PM MDT Tue Jun 8 2021 VFR conditions across all terminals this evening with chances of thunderstorms at KCYS and all Nebraska panhandle TAF sites. Clouds will begin building in in the next few hours with thunderstorms beginning at KCYS around 00Z and moving eastward into the Nebraska panhandle through the night. Conditions should clear in the Nebraska panhandle between 8Z and 10Z, then depending on if the skies clear and the leftover moisture from the thunderstorms there's a possibility for patchy fog, but confidence is currently low for the fog. && .FIRE WEATHER... Issued at 330 AM MDT Tue Jun 8 2021 Elevated to critical humidities and winds are expected west of the Laramie Range, with non-critical humidities and winds along and east of the Laramie Range through the end of the week. Fuels remain green, but may become more favorable for rapid fire growth west of the Laramie Range by the end of the week. Widely scattered showers and thunderstorms will develop this afternoon and evening along and east of Interstate 25, and over the Nebraska Panhandle Thursday evening. && .HYDROLOGY... Issued at 330 AM MDT Tue Jun 8 2021 Mild to warm temperatures will contribute to mountain snowmelt runoff and elevated stream/river levels, especially across southeast Wyoming. No sites are forecast to rise to minor flood stage, however with the diurnal rise and fall, it is possible waters may approach action stage later this week. With the lack of measurable precipitation west of the Laramie Range, the risk for rain on snowmelt will be negligible. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...None. NE...None. && SHORT TERM...CLH LONG TERM...MAJ AVIATION...LK FIRE WEATHER...MAJ HYDROLOGY...MAJ
Hazardous Weather Outlook National Weather Service Cheyenne WY 413 AM MDT Tue Jun 8 2021 WYZ103>106-109>117-091015- 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- 413 AM MDT Tue Jun 8 2021 This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Elevated to critical humidities and winds are forecast west of the Laramie Range this afternoon and early evening. Fuels are not supportive of rapid fire growth. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Elevated to critical humidities and winds will continue through the weekend. Fuels may dry out enough to pose a rapid fire growth threat later this week and weekend. Continue to monitor the latest fire weather forecasts. .Spotter information statement... Spotter activation will not be required. NEZ002-003-019>021-054-055-095-096-WYZ101-102-107-108-118-119- 091015- Dawes County-Box Butte County-Scotts Bluff County-Banner County- Morrill County-Kimball County-Cheyenne County- Northern Sioux County-Southern Sioux County- Converse County Lower Elevations-Niobrara County- East Platte County-Goshen County-Central Laramie County- East Laramie County- 413 AM MDT Tue Jun 8 2021 This hazardous weather outlook is for the western Nebraska Panhandle...east central Wyoming and portions of southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Widely scattered strong to severe thunderstorms capable of producing large hail and wind gusts in excess of 60 mph will develop late this afternoon along and east of the Interstate 25 corridor and linger through the late evening. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Widely scattered strong to severe thunderstorms capable of producing large hail and wind gusts in excess of 60 mph will be possible late Thursday afternoon and evening over east central Wyoming and the northern Nebraska Panhandle. .Spotter information statement... Spotter activation may be required between 4 PM and 10 PM, mainly east of Interstate 25. MAJ
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
828 PM MDT TUE JUN 8 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0827 PM TSTM WND GST 5 SSW BURNS 41.12N 104.38W
06/08/2021 E55 MPH LARAMIE WY PUBLIC
SPOTTER REPORTED WIND GUSTS TO 55 MPH.
&&Special Weather Statement National Weather Service Cheyenne WY 829 PM MDT Tue Jun 8 2021 NEZ020-054-WYZ108-117>119-090315- Kimball NE-Banner NE-Goshen County WY-Central Laramie County WY- South Laramie Range Foothills WY-East Laramie County WY- 829 PM MDT Tue Jun 8 2021 ...SIGNIFICANT WEATHER ADVISORY FOR WESTERN KIMBALL...WESTERN BANNER...SOUTHEASTERN GOSHEN AND EASTERN LARAMIE COUNTIES UNTIL 915 PM MDT... At 829 PM MDT, Doppler radar was tracking strong thunderstorms along a line extending from near Meriden Rest Area to 11 miles west of Carpenter. Movement was east at 15 mph. Wind gusts of 50 to 55 mph will be possible with these storms. Locations impacted include... Pine Bluffs, Burns, Albin, Oliver Campground, Hillsdale, Panorama Point, Oliver Reservoir, Meriden Rest Area, Gun Barrel, Carpenter, Ranchettes and Bushnell. This includes the following highways... Interstate 80 in Wyoming between mile markers 367 and 402. Interstate 80 in Nebraska between mile markers 1 and 15. PRECAUTIONARY/PREPAREDNESS ACTIONS... Torrential rainfall is also occurring with these storms, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4155 10465 4169 10375 4100 10377 4100 10475 TIME...MOT...LOC 0229Z 274DEG 12KT 4150 10422 4099 10456 Hammer
Special Weather Statement National Weather Service Cheyenne WY 836 PM MDT Tue Jun 8 2021 WYZ117-118-090315- Central Laramie County WY-South Laramie Range Foothills WY- 836 PM MDT Tue Jun 8 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL LARAMIE COUNTY UNTIL 915 PM MDT... At 836 PM MDT, Doppler radar was tracking a strong thunderstorm over Cheyenne, moving northeast at 15 mph. Penny size hail will be possible with this storm. Locations impacted include... Cheyenne, South Greeley, Ranchettes, Warren AFB, Frontier Park, North Cheyenne, Warren Af Base, Fox Farm-College and South Greeley High. This includes the following highways... Interstate 25 in Wyoming between mile markers 7 and 18. Interstate 80 in Wyoming between mile markers 359 and 378. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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 4104 10482 4120 10493 4137 10463 4112 10447 TIME...MOT...LOC 0236Z 243DEG 12KT 4116 10479 Hammer
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
837 PM MDT TUE JUN 8 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0833 PM HAIL 2 NW SOUTH GREELEY HIGH 41.12N 104.83W
06/08/2021 M0.70 INCH LARAMIE WY PUBLIC
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
842 PM MDT TUE JUN 8 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0835 PM HAIL 1 NE LANCE CREEK 43.03N 104.62W
06/08/2021 M1.00 INCH NIOBRARA WY EMERGENCY MNGR
&&
AWPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
930 PM MDT TUE JUN 8 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0930 PM HAIL 1 N FOX FARM-COLLEGE 41.12N 104.79W
06/08/2021 M0.70 INCH LARAMIE WY TRAINED SPOTTER
&&
AWThe Cheyenne radar (KCYS), 86 km away, was scanning. The volume nearest the first event began at 03:32 UTC.
1 thunderstorm wind. Local standard time, as filed.
Power poles were knocked down causing wide spread power outages.
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, June 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: 955608.