Heavy rain led to a localized flood.
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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.
Heavy rain led to a localized flood.
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 Sep 3, 5:16 AM CST, 3 hours 40 minutes earlier.
Area Forecast Discussion National Weather Service Omaha/Valley NE 616 AM CDT Fri Sep 3 2021 ...Updated Aviation Forecast Discussion... .DISCUSSION... Issued at 345 AM CDT Fri Sep 3 2021 .Today through Saturday: Showers and storms continue to waft east across eastern Nebraska and southwestern Iowa, and had earlier brought heavy rainfall and localized flooding to areas of easter Nebraska just after midnight this morning around the Saline and Lancaster County areas. These showers and storms have reoriented themselves to be more north to south rather than training over the same areas, bringing down the flooding risk through the rest of the morning. Behind the precipitation, a cold front extends southeast from a surface low located over the SD/NE/IA border region as of 07z. This cold front is helping cool temperatures behind it to below 65 degrees in central Nebraska and is also bringing in some low stratus that'll likely keep today's high temperatures limited to the 70's. Looking at the mid-levels, GOES water vapor imagery shows quasi-zonal flow aloft with the main upstream feature being a shortwave trough currently located over the Idaho/Montana. Short-term models have been keeping Friday mostly dry, with chances for showers and storms skirting around the western and southern edges of the CWA after 06z Saturday through 18z; mainly associated with the advancement of the aforementioned of the mid-level shortwave over ID/MT. The combination of the overnight/morning timing of the precipitation chances along with northerly winds will keep chances for any rumbles of thunder rather low, making a steady stratiform rain the most likely scenario for anywhere that gets rainfall. By Saturday afternoon, rain chances should have moved out of the area, leaving a cool and comfortable day in their wake. .Sunday: Early Sunday, global models begin hinting at some low-end rain chances as an embedded shortwave passes through the northwesterly flow, primarily from 12-21z. If that timing ends up working out, instability will once again be in short supply and will limit chances for thunder, let alone severe weather. If this feature slows down a bit and shifts the rain chances to the afternoon/evening, storm chances increase as ML CAPE values could reach over 1000 J/kg. By late Sunday, shower and storm chances should be east of the forecast area and will mark the beginning of the dry remainder of the forecast. .Monday through Thursday: To start the next work week, a mid-level high pressure center begins to move eastward from the California coast into the Intermountain west, then eventually to the Front Range by late Thursday. The main points of this period of the forecast are expected to be the following: temperatures should make their return to the 80's and could reach the 90's that next weekend, and the building ridge should steer the better forcing for showers and storms north and east of eastern Nebraska and western Iowa, leaving the area with below normal moisture. Could some late summertime airmass thunderstorms occur during this period of the forecast? Absolutely. With that being said, these chances aren't very high and won't be able to be pinned down until we reach next week. What exactly this period will look like is still rather murky, but that portion of the period should close out the forecast on a quiet note. && .AVIATION...(For the 12Z TAFS through 12Z Saturday morning) Issued at 614 AM CDT Fri Sep 3 2021 MVFR to IFR conditions for several hours at KOFK/KOMA. KLNK should be VFR at TAF issuance, but becomes MVFR within an hour or two. Otherwise, Back to VFR at KLNK by 21z and 01z at KOMA. && .OAX WATCHES/WARNINGS/ADVISORIES... NE...None. IA...None. && DISCUSSION...Petersen AVIATION...DeWald
Hazardous Weather Outlook National Weather Service Omaha/Valley NE 435 AM CDT Fri Sep 3 2021 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-032345- 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- 435 AM CDT Fri Sep 3 2021 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 No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
846 AM CDT FRI SEP 3 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 AM HEAVY RAIN LINCOLN 8.1 SSE 40.71N 96.61W
09/03/2021 M3.29 INCH LANCASTER NE COCORAHS
&&
PEARSONPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
847 AM CDT FRI SEP 3 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 AM HEAVY RAIN LINCOLN 5.8 SSE 40.72N 96.62W
09/03/2021 M2.62 INCH LANCASTER NE COCORAHS
&&
PEARSONPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
908 AM CDT FRI SEP 3 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 AM HEAVY RAIN CRETE 40.62N 96.96W
09/03/2021 M3.75 INCH SALINE NE PUBLIC
&&
PEARSONPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
935 AM CDT FRI SEP 3 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 AM HEAVY RAIN BENNET 40.68N 96.51W
09/03/2021 M2.75 INCH LANCASTER NE PUBLIC
&&
PEARSONPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
939 AM CDT FRI SEP 3 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 AM HEAVY RAIN DAVID CITY 41.25N 97.13W
09/03/2021 M2.20 INCH BUTLER NE PUBLIC
&&
PEARSONPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
950 AM CDT FRI SEP 3 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 AM HEAVY RAIN 2 E DORCHESTER 40.65N 97.09W
09/03/2021 M4.80 INCH SALINE NE PUBLIC
&&
PEARSONThe national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Water across the road south of town on Turkey Creek. Waterways are full. Small creek along highway 33 is out of its banks.
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: 985281.