Isolated convection across northeast Nebraska brought an instance of flash flooding in Cedar County where a trained spotter reported water flowing over multiple county roads. There was also a funnel cloud the following day that received a lot of social media attention that developed over Norfolk.
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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.
Isolated convection across northeast Nebraska brought an instance of flash flooding in Cedar County where a trained spotter reported water flowing over multiple county roads. There was also a funnel cloud the following day that received a lot of social media attention that developed over Norfolk. Additional funnels clouds were noted in Monona County the evening of the 21st.
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 Jul 19, 5:19 AM CST, 4 hours 41 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Omaha/Valley NE 619 AM CDT Fri Jul 19 2024 .KEY MESSAGES... - An extended stretch of cooler-than-average temperatures will persist into next week. - Widespread rain chances will be Friday evening into Sunday. There are additional spotty rain chances into next week. && .DISCUSSION... Issued at 444 AM CDT Fri Jul 19 2024 Temperatures have slipped into the 50s and 60s across the area this morning with light southerly winds. Upper air analysis shows a ridge over the Four Corners area separating two distinct trofs. This omega blocking pattern will remain through the 7 day forecast leaving northwesterly flow the dominating factor in a cool forecast for Nebraska and Iowa. KOAX / KFSD reveals some pulse looking storms just west of Niobrara, NE. These are likely in response to the WAA at the nose of the nocturnal jet. With 50dBz returns up to 20,000 feet, I'd expect at least a chance of some pea sized hail. The HRRR is notably dry this morning, but other HiRes models suggest convection could make it close to Lincoln, before lunch. Storms should remain sub-severe. Storms may become more powerful this afternoon with a "marginal" severe weather category draped over areas west of a line from Yankton to Norfolk to Columbus to York. Better chances of severe weather are painted across central Nebraska. CAPE peaks at under 2,000 J/kg along with plentiful shear of 30-50 knots difference between 0km and 6km. Weak southerly surface flow will find itself under a jet streak producing 40-50 knot north- northwesterly winds. Damaging winds should be the greatest threat as storms grow into bowing lines. The HRRR currently keeps the best chance for flipped center pivots west of the forecast area. Forecast highs of lower to mid-80s may actually leave the day as the warmest of the following few. Elevated smoke from the West Coast and western Canada should produce some milky skies peeking from behind partial cloud cover. It'll nerf the power of what little July sun we receive. .SATURDAY... Saturday morning represents the forecast's best chance of rain. It's worth noting that WPC has forecast a marginal chance of flash flooding. Most locations will see less than an inch, but localized probability matched mean (HREF LPMM) suggests 2-4" is possible in localized areas. High temps will be only in the lower to mid-70s. In July. I can only find one late-July day in the past ten years that didn't manage at least 75 in Omaha (7/15/16). .SUNDAY AND NEXT WEEK... More showers (30-50%) are possible on Sunday with the passage of a mid-level shortwave. Under the overcast skies, temps again will fall shy of 80 degrees. The blocking pattern is expected to change little over the next week, leaving temps shy of seasonal norms. Both the 00Z GFS and 00Z Euro suggest the blocking pattern breaking down as we approach next weekend. This may bring increasing temps and a dry period over the week's second half. && .AVIATION /12Z TAFS THROUGH 12Z SATURDAY/... Issued at 617 AM CDT Fri Jul 19 2024 Thunderstorms in northeast NE have been near KOFK, but will likely be southeast of that TAF location by TAF issuance. Otherwise, additional thunderstorms will be possible at KOFK 20-24z, and at KLNK/KOMA 23-02z. Southerly winds 7-9 knots increasing to 12-21 knots by 16-17z, then below 12 knots beyond then. And finally, MVFR ceilings could move into the KOFK area later in the TAF by 20/07z. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...None. IA...None. && DISCUSSION...Nicolaisen AVIATION...
Hazardous Weather Outlook National Weather Service Omaha/Valley NE 515 AM CDT Fri Jul 19 2024 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-200015- 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- 515 AM CDT Fri Jul 19 2024 This Hazardous Weather Outlook is for portions of southwest Iowa...west central Iowa...east central Nebraska...northeast Nebraska and southeast Nebraska. .DAY ONE...Today and Tonight Isolated strong to severe storms are possible late this afternoon into evening across portions of northeast Nebraska, mainly north of U.S. 30. Wind gusts up to 60 mph and/or hail up to quarter size are possible, as is locally heavy rainfall. .DAYS TWO THROUGH SEVEN...Saturday through Thursday The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected through Friday.
Special Weather Statement National Weather Service Omaha/Valley Nebraska 529 AM CDT Fri Jul 19 2024 NEZ011-012-191045- Cedar NE-Knox NE- 529 AM CDT Fri Jul 19 2024 ...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL KNOX AND SOUTHWESTERN CEDAR COUNTIES THROUGH 545 AM CDT... At 529 AM CDT, Doppler radar was tracking a strong thunderstorm 5 miles northeast of Wausa, or 11 miles southwest of Hartington, moving east at 25 mph. HAZARD...Nickel size hail. SOURCE...Radar indicated. IMPACT...Minor hail damage to vegetation is possible. * This storm will remain over mainly rural areas of southwestern Cedar and east central Knox Counties. PRECAUTIONARY/PREPAREDNESS ACTIONS... If outdoors, consider seeking shelter inside a building. && LAT...LON 4251 9754 4261 9753 4260 9730 4246 9733 TIME...MOT...LOC 1029Z 285DEG 23KT 4255 9746 MAX HAIL SIZE...0.88 IN MAX WIND GUST...<30 MPH DeWald
The Sioux Falls radar (KFSD), 109 km away, was scanning. The volume nearest the first event began at 15:59 UTC.
1 flash flood, 1 funnel cloud. Local standard time, as filed.
The office received a report from a trained spotter of water flowing over several roads including 888th road near Fordyce.
Several pictures and videos were sent on social media of a funnel cloud.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2024Every state in 2024This day in weather historyWarnings in Nebraska, July 2024
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: 1206718, 1206719.