An isolated supercell thunderstorm moved out of South Dakota and into Knox county during the late evening hours.
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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 OAX wrote it up.
An isolated supercell thunderstorm moved out of South Dakota and into Knox county during the late evening hours.
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 Omaha, NE wrote its last area forecast discussion before the first event at Aug 7, 5:27 PM CST, 4 hours 33 minutes earlier.
Area Forecast Discussion National Weather Service Omaha/Valley NE 627 PM CDT Wed Aug 7 2019 .SHORT TERM...(Tonight through Friday Night) Issued at 324 PM CDT Wed Aug 7 2019 Cloud cover remained across far southeast Nebraska this afternoon, behind lingering showers and storms pushing into northeast Kansas. Conditions were muggy across the rest of the forecast area as high temperatures climbed into the low to mid 80s and dewpoints approached the upper 60s and lower 70s. Redevelopment of convection is expected late this evening and overnight along residual outflow boundaries. Current model trends indicate the best chance for storms to initiate would be near the central KS/NE shortly after midnight tonight. Short term convection allowing models continue to depict thunderstorm activity spreading into northeast KS along the nose of a 20-30 kt low level jet. Showers and storms will likely spread northeast into southeast Nebraska overnight, with additional precipitation developing across eastern Nebraska and western Iowa as a weak upper level disturbance pushes through the region by early Thursday morning. Around 1000 J/kg of instability and bulk shear of 40-50 kts will provide at least a marginal risk of severe storms overnight. The main threats will likely be large hail and damaging winds. Spotty showers and storms will linger through Thursday morning, before diminishing early Thursday afternoon as high pressure builds in at the surface. A line of scattered showers and storms may develop with peak heating, late Thursday afternoon and evening, along a surface boundary draped across the southern half of the forecast area. However, this convection should be fairly short- lived. The surface high will remain across the area Thursday night and Friday which, combined with the lack of additional moisture, will keep any new precipitation development isolated at best. Temperatures will remain relatively mild Thursday and Friday, only rising into the upper 70s and low 80s. .LONG TERM...(Saturday through Wednesday) Issued at 324 PM CDT Wed Aug 7 2019 A weak shortwave and cold front will move through the region this weekend, bringing another round of storms to the forecast area. The front will move into the region Saturday morning, bringing at least a chance for precipitation to the area through Sunday. Models are also converging on another shortwave moving along the central US/Canadian border early next week, and pulling another cold front across the central plains Monday through early Tuesday. Temperatures are forecast to climb slightly, into the mid 80s Saturday, before dipping back into the lower 80s through the first half of next week. && .AVIATION...(For the 00Z TAFS through 00Z Thursday evening) Issued at 615 PM CDT Wed Aug 7 2019 Weather will be mainly quiet overnight. There may be a few thunderstorms in far northeast Nebraska around midnight, but these storms may remain north of OFK and therefore was not included in the TAF. Similarly, there may be a few thunderstorms in far southeast Nebraska, but these should stay south of LNK and OMA. Expect MVFR ceilings to impact OFK and LNK early Thursday morning, returning to VFR by the afternoon. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...None. IA...None. && SHORT TERM...KG LONG TERM...KG AVIATION...HB
Hazardous Weather Outlook National Weather Service Omaha/Valley NE 336 PM CDT Wed Aug 7 2019 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-081045- Monona-Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont- Page-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison- Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler- Saunders-Douglas-Sarpy-Seward-Lancaster-Cass-Otoe-Saline- Jefferson-Gage-Johnson-Nemaha-Pawnee-Richardson- 336 PM CDT Wed Aug 7 2019 This Hazardous Weather Outlook is for portions of southwest Iowa...west central Iowa...east central Nebraska...northeast Nebraska and southeast Nebraska. .DAY ONE...Tonight and Thursday There is a chance for redevelopment of thunderstorms tonight in parts of northern Kansas and southern Nebraska. If storms do fire in southeast Nebraska, there will be a risk of large hail and damaging winds, mainly south of a Seward to Lincoln and Nebraska City line. Otherwise thunderstorms are forecast to spread northward overnight, with most of eastern Nebraska and southwest Iowa seeing a chance for small hail and gusty winds. Thunderstorms will linger through the morning on Thursday, but severe storms are not expected. Flooding will continue on the Missouri River above Lewis and Clark Lake, and from around Nebraska City downstream into Missouri. .DAYS TWO THROUGH SEVEN...Thursday night through Wednesday There is a chance for thunderstorms off and on this weekend and into early next week. Flooding will continue on the Missouri River above Lewis and Clark Lake, and from Nebraska City downstream into Missouri. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed tonight or tomorrow.
The Sioux Falls radar (KFSD), 123 km away, was scanning. The volume nearest the first event began at 04:01 UTC.
2 thunderstorm wind, 2 hail. Local standard time, as filed.
Power lines and trees were blown down. Hail of unknown size was also reported.
The public reported golf ball size hail.
Trees blown down. Windows blown out from wind driven hail.
The public reported hail up to tennis ball size. This created substantial crop damage in the area.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2019Every state in 2019This day in weather historyWarnings in Nebraska, August 2019
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: 851321, 851322, 851324, 851323.