Heavy rain producing thunderstorms moved across Banner and Scotts Bluff Counties producing over an inch of rainfall contributing to street flooding in the city of Scottsbluff and out in the country of Banner County.
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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.
Heavy rain producing thunderstorms moved across Banner and Scotts Bluff Counties producing over an inch of rainfall contributing to street flooding in the city of Scottsbluff and out in the country of Banner 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 13, 10:23 PM MST, 7 minutes earlier.
Area Forecast Discussion National Weather Service Cheyenne WY 1123 PM MDT Tue Jul 13 2021 .UPDATE... Issued at 1018 PM MDT Tue Jul 13 2021 The line of thunderstorms will continue to march east during the next couple of hours in a more unstable environment. The leading edge of these thunderstorms contains some gusts between 40 and 50 mph and perhaps pea size hail. The line has shown some signs of intensifying during the last 30 mins or so. As a result, we may end up keeping the Severe Thunderstorm Watch in effect for another hour longer. && .SHORT TERM...(This evening through Thursday) Issued at 245 PM MDT Tue Jul 13 2021 Primary concern over the next 12 hours is the potential for severe thunderstorms across portions of southeast Wyoming and western Nebraska late this afternoon through late this evening. There is enhanced to slight risk for severe thunderstorms mainly north of the North Platte River Valley, with Converse, Niobrara, Sioux, and Dawes counties the primary risk area for strong damaging winds and some large hail. This event should be later in the day, and don't expect thunderstorms to really get going in this area until the upper level trough/disturbance progresses eastward into the eastern portion of Wyoming by this evening. KCYS radar loop this afternoon shows widely scattered thunderstorms across the I-80 corridor. This activity has been sub-severe, but a few cells have been occasionally strong at times with wind gusts around 50 mph and dime sized hail. Expect this trend to continue into the evening hours since a strong CAP inversion and 0-3km CIN exists further east across the plains. Can't rule out a severe thunderstorm or two along/near the I-80 corridor, but confidence is low with relatively short durations expected. Current Watervapor loop shows the upper level trough/disturbance moving into western Wyoming at this hour. This feature will be the primary forcing responsible for the line of severe thunderstorms forecast to push east across east central Wyoming and the northern Nebraska panhandle this evening or late this evening respectively. Glancing at the current convective environment up north shows that there is still quite a bit of CIN east of the Laramie Range and into western Nebraska as well. However, the forcing alone should be enough to break the CAP inversion this evening. MLCAPE has grown to 500 to 700 j/kg, and expect these numbers to continue increasing with additional surface heating and midlevel cooling associated with the upper level disturbance. High res guidance in very good agreement with the timing and evolution of this line. So kept high POP and worded the forecast for severe thunderstorms along and north of a line from Douglas Wyoming to Alliance Nebraska. Thunderstorms should push east of the Chadron/Alliance area by midnight. For Wednesday, cooler and more stable day with any thunderstorm activity confined to areas near and in the mountains. The best chance for thunderstorms look to be near the Black Hills, including the northern Nebraska panhandle, and along and west of the I-25 corridor. High temperatures in the upper 70s to mid 80s are expected across the area, warmest over Carbon County. Similar conditions expected on Thursday, but slight warmer with any thunderstorm chances mainly confined to southeast Wyoming. .LONG TERM...(Friday through Monday) Issued at 220 AM MDT Tue Jul 13 2021 Friday...Ridging aloft becomes a little more pronounced with temperatures a bit warmer than Thursday. Still though, there should be enough low and mid level moisture for isolated to scattered late day thunderstorms mainly near the Colorado state line. Saturday...Maximum temperatures continue a slow warming trend. Should see a slight decrease in late day shower and thunderstorm coverage. Sunday-Monday...Ridging aloft should limit shower and thunderstorm coverage with isolated coverage at best. With low level upslope winds east of Interstate 25, temperatures should remain about the same as the previous days. && .AVIATION...(For the 06Z TAFS through 06Z Wednesday night) Issued at 1118 PM MDT Tue Jul 13 2021 Some strong thunderstorms are moving through the Nebraska panhandle impacting KBFF and KAIA with gusty winds, IFR visibilities, and heavy thunderstorms and rain. MVFR to IFR ceilings possible between 12Z and 21Z today for the Nebraska panhandle TAF terminals. VFR conditions expected elsewhere with some possible afternoon thunderstorms at KCYS and KLAR. && .FIRE WEATHER... Issued at 155 PM MDT Tue Jul 13 2021 Red Flag Warning remains in effect for some dry lightning across southwest Carbon County this afternoon. Cancelled the Red Flag for zones 307 and 308 (mainly Albany County) since thunderstorms have produced wetting rainfall already, early this afternoon, with Laramie Airport and areas around Laramie receiving 0.10 to 0.30 rainfall at this time. Otherwise, fire weather concerns are expected to be low for the rest of the week due to lighter winds and higher humidities Wednesday and Thursday. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...None. NE...None. && UPDATE...REC SHORT TERM...TJT LONG TERM...RUBIN AVIATION...LK FIRE WEATHER...TJT
Hazardous Weather Outlook National Weather Service Cheyenne WY 506 AM MDT Tue Jul 13 2021 NEZ002-003-019>021-054-055-095-096-WYZ102-106>108-116>119-141115- Dawes County-Box Butte County-Scotts Bluff County-Banner County- Morrill County-Kimball County-Cheyenne County- Northern Sioux County-Southern Sioux County-Niobrara County- Central Laramie Range and Southwest Platte County- East Platte County-Goshen County-South Laramie Range- South Laramie Range Foothills-Central Laramie County- East Laramie County- 506 AM MDT Tue Jul 13 2021 This hazardous weather outlook is for portions of panhandle Nebraska...east central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Severe thunderstorms are expected this afternoon that will develop along the Laramie Range and spread east into the Nebraska Panhandle this evening. Golfball sized hail...damaging downburst winds in excess of 70 mph and localized heavy rainfall are the primary hazards. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Severe thunderstorms are again possible Friday that could produce large hail and damaging downburst winds. .Spotter information statement... Spotter activation may be needed along and east of the I-25 Corridor after 2PM today. Spotters may be needed after 5 PM in the Nebraska Panhandle through midnight tonight. WYZ101-103>105-109-110-113-141115- Converse County Lower Elevations-North Laramie Range- Ferris/Seminoe/Shirley Mountains-Shirley Basin- Central Carbon County-North Snowy Range Foothills- Upper North Platte River Basin- 506 AM MDT Tue Jul 13 2021 This hazardous weather outlook is for portions of east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Severe thunderstorms are expected this afternoon that will develop across Carbon County after 11 AM and spread east through the afternoon. High based thunderstorms will create little in the way of rain and the main hazard will be dry lightning and damaging downburst winds. Damaging downburst winds in excess of 60 mph will be the primary hazards with thee storms. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation will not be needed. WYZ111-112-114-115-141115- Southwest Carbon County-Sierra Madre Range-Snowy Range- Laramie Valley- 506 AM MDT Tue Jul 13 2021 This hazardous weather outlook is for portions of south central Wyoming and southeast Wyoming. .DAY ONE...TODAY AND TONIGHT Severe thunderstorms are expected this afternoon that will develop across Carbon County after 11 AM and spread east through the afternoon. High based thunderstorms will create little in the way of rain and the main hazard will be dry lightning and damaging downburst winds. A Red Flag Warning for Dry Lightning is in effect for parts of Carbon and Albany Counties from 11 AM through 6 PM today. Damaging downburst winds in excess of 60 mph and multiple fire starts from the dry lightning are the primary hazards with thee storms. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY The probability for widespread hazardous weather is low. .Spotter information statement... Spotter activation will not be needed.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
530 PM MDT TUE JUL 13 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0529 PM HAIL 1 S GERING 41.81N 103.66W
07/13/2021 M0.25 INCH SCOTTS BLUFF NE PUBLIC
&&Special Weather Statement
National Weather Service Cheyenne WY
642 PM MDT Tue Jul 13 2021
WYZ101-103-140115-
Converse County Lower Elevations WY-North Laramie Range WY-
642 PM MDT Tue Jul 13 2021
...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL CONVERSE COUNTY
UNTIL 715 PM MDT...
At 642 PM MDT, Doppler radar was tracking a strong thunderstorm 10
miles west of Boxelder, or 18 miles southeast of Casper, moving
southeast at 30 mph.
Penny size hail and winds in excess of 30 mph will be possible with
this storm.
Locations impacted include...
Boxelder.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for
east central Wyoming.
LAT...LON 4272 10566 4249 10589 4262 10608 4275 10607
4275 10600
TIME...MOT...LOC 0042Z 299DEG 27KT 4266 10605
Kubelka/HammerSpecial Weather Statement National Weather Service Cheyenne WY 713 PM MDT Tue Jul 13 2021 WYZ103-140145- North Laramie Range WY- 713 PM MDT Tue Jul 13 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CONVERSE COUNTY UNTIL 745 PM MDT... At 713 PM MDT, Doppler radar was tracking a strong thunderstorm over Boxelder, or 23 miles west of Douglas, moving east at 25 mph. Nickel size hail and winds in excess of 30 mph will be possible with this storm. Locations impacted include... Laprele Reservoir and Boxelder. PRECAUTIONARY/PREPAREDNESS ACTIONS... Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for east central Wyoming. LAT...LON 4258 10594 4271 10584 4271 10556 4247 10571 TIME...MOT...LOC 0113Z 280DEG 20KT 4263 10582 Kubelka/Hammer
Special Weather Statement National Weather Service Cheyenne WY 1030 PM MDT Tue Jul 13 2021 NEZ003-019>021-095-096-WYZ108-140515- Scotts Bluff NE-Box Butte NE-North Sioux NE-Morrill NE- South Sioux NE-Banner NE-Goshen County WY- 1030 PM MDT Tue Jul 13 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN BOX BUTTE...SCOTTS BLUFF...NORTHWESTERN MORRILL...NORTHEASTERN BANNER...SOUTHEASTERN SIOUX AND SOUTHEASTERN GOSHEN COUNTIES UNTIL 1115 PM MDT... At 1029 PM MDT, Doppler radar was tracking a strong thunderstorm near Lake Alice, or near Scottsbluff, moving southeast at 25 mph. Pea size hail and wind gusts of 50 to 55 mph will be possible with this storm. Locations impacted include... Scottsbluff, Gering, Mitchell, Terrytown, Morrill, Minatare, Lyman, Wildcat Hills State Recreation Area, Lake Minatare Campground, Stegall, Wildcat Hills Campground, Scotts Bluff National Monument, Kilpatrick Lake, Hubbard Hill, Berea, Flahertys Corner, Moomaws Corner, Scottsbluff Airport, Lake Minatare and Lake Alice. PRECAUTIONARY/PREPAREDNESS ACTIONS... Frequent cloud to ground lightning is occurring with this storm. Lightning can strike 10 miles away from a thunderstorm. Seek a safe shelter inside a building or vehicle. This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. && A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for the Panhandle of Nebraska...and southeastern Wyoming. LAT...LON 4196 10409 4244 10357 4218 10284 4151 10363 TIME...MOT...LOC 0429Z 306DEG 21KT 4194 10358 Kubelka/Cox
Special Weather Statement National Weather Service Cheyenne WY 1108 PM MDT Tue Jul 13 2021 NEZ019>021-140545- Scotts Bluff NE-Morrill NE-Banner NE- 1108 PM MDT Tue Jul 13 2021 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SCOTTS BLUFF... SOUTHWESTERN MORRILL AND NORTHEASTERN BANNER COUNTIES UNTIL 1145 PM MDT... At 1107 PM MDT, Doppler radar was tracking a strong thunderstorm near Wildcat Hills Campground, or 15 miles south of Scottsbluff, moving east at 30 mph. Penny size hail and wind gusts of 50 to 55 mph will be possible with this storm. Torrential rainfall is also expected with this storm. Locations impacted include... Bayard, Wildcat Hills State Recreation Area, Chimney Rock State Park, Harrisburg, Wildcat Hills Campground, Redington, South Bayard Junction and McGrew. A Severe Thunderstorm Watch remains in effect until midnight MDT for the Panhandle of Nebraska. LAT...LON 4156 10382 4178 10379 4174 10314 4147 10317 TIME...MOT...LOC 0507Z 275DEG 26KT 4165 10372 Cox
The Cheyenne radar (KCYS), 124 km away, was scanning. The volume nearest the first event began at 05:28 UTC.
2 flash flood. Local standard time, as filed.
Several streets in town flooded.
Roads near Pumpkin Creek east of Highway 71 were reported flooded.
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: 965854, 965859.