Precipitation continued well-below normal across northeast Nebraska, varying from 25 to 50 percent of normal. Temperatures were mainly near to slightly below normal.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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 FSD wrote it up.
Precipitation continued well-below normal across northeast Nebraska, varying from 25 to 50 percent of normal. Temperatures were mainly near to slightly below normal.
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 Sioux Falls, SD wrote its last area forecast discussion before the first event at Aug 31, 9:39 PM CST, 2 hours 21 minutes earlier.
AREA FORECAST DISCUSSION National Weather Service Sioux Falls SD 1039 PM CDT Mon Aug 31 2020 .SHORT TERM...(This Evening through Tuesday) Issued at 204 PM CDT Mon Aug 31 2020 We're on day one of a very quiet stretch of weather across the Northern US. A breezy northwest wind continues to pull lower dew points southeast, dropping the relative humidity values into the lower 30s at peak heat. Tonight: High level clouds gradually spread across the area overnight as mid-lvl frontogenesis increases. Ceilings gradually drop into the 8-10K ft AGL range by daybreak, and there could even be a few high based showers. For most though, sprinkles or virga will prevail given the dry sub-cloud layer. .LONG TERM...(Tuesday Night through Monday) Issued at 204 PM CDT Mon Aug 31 2020 Tuesday: Lingering cloud cover and even a few rain drops will be likely Tuesday morning, but most will stay dry. A light southerly wind develops, and temperatures will attempt to warm into the upper 70s to lower 80s by the afternoon. Tuesday Night - Friday: Rather minimal concerns through the rest of this week. Models remain consistent in bringing a frontal boundary through the area very late Wednesday night into Thursday morning. Ahead of this boundary, we should see temperatures jump into the middle and upper 80s. Dew points may mix a bit further than forecast and this could lead to at least a very low end fire weather concern. Once the boundary moves through early Thursday, winds should gust fairly quickly. Soundings suggest potential for 30+ knot gusts and thus have bumped up wind speeds throughout the morning hours. A roller coaster ride of temperatures continues on Friday with temperatures climbing back into the the lower 80s after dipping into the 70s on Thursday. Saturday-Sunday: Another upwards swing in temperatures is expected again on Saturday as another front begins to develop over the Northern Plains. Highs will again approach 90 degrees. A progressive shortwave embedded in the increasing NW flow pattern aloft will push this front through the area on Sunday, once again dropping temperatures and producing only a minimal risk of rain. Monday: Medium range model consistency allowing for higher confidence in a bigger cooldown for next week, beginning in earnest on Monday. Large scale troughing will dig into the eastern half of the CONUS for next week, with the initial surge of cold air bringing shower and isolated thunder risks early next week. Temperatures may average 10 or more degrees below normal. && .AVIATION...(For the 06Z TAFS through 06Z Tuesday night) Issued at 1040 PM CDT Mon Aug 31 2020 High clouds will continue to increase overnight, with a few sprinkles possible in the hours around sunrise. No measurable precipitation or thunderstorms are expected. South and southwesterly winds will develop during the late morning Tuesday, eventually bringing gusts in the 20 to 25 kt range by the mid afternoon. Dry conditions prevail through Tuesday night. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...NONE. MN...NONE. IA...NONE. NE...NONE. && SHORT TERM...Dux LONG TERM...Dux AVIATION...VandenBoogart
Hazardous Weather Outlook National Weather Service Sioux Falls SD 248 PM CDT Mon Aug 31 2020 IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097- 098-NEZ013-014-SDZ038>040-050-052>071-012000- Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson- Pipestone-Rock-Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory- Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-Hanson- McCook-Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme- Yankton-Union- 248 PM CDT Mon Aug 31 2020 This Hazardous Weather Outlook is for portions of northwest Iowa, west central Iowa, southwest Minnesota, northeast Nebraska, central South Dakota, east central South Dakota, south central South Dakota, and southeast South Dakota. .DAY ONE...This Afternoon and Tonight No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Northerly winds will increase for a few hours behind a cold front early Thursday morning. Occasional gusts of 35 to 45 mph will be possible, especially in areas west of Interstate 29. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1047 PM CDT MON AUG 31 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0437 AM HAIL MERRILL 42.72N 96.25W
08/31/2020 E1.00 INCH PLYMOUTH IA PUBLIC
REPORT VIA SOCIAL MEDIA.
&&The national radar mosaic for the moment the first event began.
1 drought. Local standard time, as filed.
Severe drought (D2) started the month with continued very warm and dry conditions. Drought conditions were alleviated somewhat by mid-month by rainfall which brought 1.90 inches at Emerson and 1.60 inches at Sioux City between September 8-12.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Nebraska in 2020Every state in 2020This day in weather historyWarnings in Nebraska, September 2020
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: 919961.