Rainfall averaging from 4 to 7 inches around the Sioux Falls metro area resulted in ponding of water in small creek basins and some poor drainage urban areas.
Every event with a place to put it. 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.
Rainfall averaging from 4 to 7 inches around the Sioux Falls metro area resulted in ponding of water in small creek basins and some poor drainage urban areas.
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 Sep 20, 5:52 AM CST, 4 hours 38 minutes earlier.
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</html>Hazardous Weather Outlook National Weather Service Sioux Falls SD 514 AM CDT Thu Sep 20 2018 IAZ002-003-012>014-020>022-031-032-MNZ081-089-090-211015- Osceola-Dickinson-Sioux-O'Brien-Clay IA-Plymouth-Cherokee- Buena Vista-Woodbury-Ida-Cottonwood-Nobles-Jackson- 514 AM CDT Thu Sep 20 2018 This Hazardous Weather Outlook is for portions of northwest Iowa, west central Iowa, and southwest Minnesota. .DAY ONE...Today and Tonight As a cold front moves through, severe weather is a threat in the mid to late afternoon hours. The primary threats are hail up to the size of ping pong balls, 70 mph winds, and isolated tornadoes. .DAYS TWO THROUGH SEVEN...Friday through Wednesday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is likely between 3 pm and 6 pm. IAZ001-MNZ071-072-080-097-098-NEZ013-014-SDZ040-056-062-067-070- 071-211015- Lyon IA-Lincoln MN-Lyon MN-Murray-Pipestone-Rock-Dixon-Dakota- Brookings-Moody-Minnehaha-Lincoln SD-Clay SD-Union- 514 AM CDT Thu Sep 20 2018 This Hazardous Weather Outlook is for portions of northwest Iowa, southwest Minnesota, northeast Nebraska, east central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight Rainfall with embedded thunderstorms will occur today. In the early to mid afternoon hours, an isolated storm may be marginally severe, but most activity will be below severe limits. What is more of a danger is locally heavy rainfall, especially this morning. Be aware that some county and township roads have flooded especially south of Interstate 90. .DAYS TWO THROUGH SEVEN...Friday through Wednesday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed but flooding or rainfall reports are welcome. SDZ038-039-050-052>055-057>061-063>066-068-069-211015- Beadle-Kingsbury-Gregory-Jerauld-Sanborn-Miner-Lake-Brule-Aurora- Davison-Hanson-McCook-Charles Mix-Douglas-Hutchinson-Turner- Bon Homme-Yankton- 514 AM CDT Thu Sep 20 2018 This Hazardous Weather Outlook is for portions of central South Dakota, east central South Dakota, south central South Dakota, and southeast South Dakota. .DAY ONE...Today and Tonight Rainfall with embedded thunderstorms will occur today. Severe weather is not expected, but locally heavy rainfall can occur with an additional one to one and a half inches of rain possible in some locations through the day. Be aware that flash flooding may occur over county and township roads this morning, especially south of Interstate 90. .DAYS TWO THROUGH SEVEN...Friday through Wednesday No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed however rainfall or flooding reports are welcome.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
803 AM CDT THU SEP 20 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0755 AM FLASH FLOOD 4 SSE OLIVET 43.19N 97.66W
09/20/2018 HUTCHINSON SD EMERGENCY MNGR
WATER ACROSS NUMEROUS ROADS.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1039 AM CDT THU SEP 20 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1123 AM HEAVY RAIN 1 S ALCESTER 43.02N 96.63W
09/19/2018 M3.50 INCH UNION SD PUBLIC
24 HOUR RAINFALL, INCLUDING THE HEAVY
RAINFALL EARLY THIS MORNING.
1130 AM HEAVY RAIN 6 SSW HUDSON 43.05N 96.49W
09/19/2018 M2.47 INCH UNION SD MESONET
MESONET STATION HWDI4, 3 N HAWARDEN.
0145 AM HEAVY RAIN 6 NW ANOKA 43.02N 98.90W
09/20/2018 M2.81 INCH GREGORY SD MESONET
MESONET STATION E7290, BUTTE 8NNW.
1130 AM HEAVY RAIN 4 SSE OLIVET 43.19N 97.64W
09/19/2018 M3.16 INCH HUTCHINSON SD MESONET
MESONET STATION SCOS2, 4 SE OLIVET.
1137 AM HEAVY RAIN PLATTE 43.38N 98.84W
09/19/2018 M1.72 INCH CHARLES MIX SD MESONET
MESONET STATION E6057, PLATTE.
0538 AM HEAVY RAIN HULL 43.19N 96.14W
09/20/2018 M4.00 INCH SIOUX IA PUBLIC
RAINFALL SINCE 9 PM WEDNESDAY NIGHT.
0745 AM HEAVY RAIN DOON 43.28N 96.24W
09/20/2018 M6.00 INCH LYON IA PUBLIC
24 HOUR RAINFALL FROM 7 AM WEDNESDAY TO 7 AM
THURSDAY.
1151 AM HEAVY RAIN 3 NNW LE MARS 42.82N 96.19W
09/19/2018 M2.06 INCH PLYMOUTH IA MESONET
MESONET STATION D1631, 2 NNW LE MARS.
1130 AM HEAVY RAIN 1 WSW ORANGE CITY 43.00N 96.08W
09/19/2018 M8.46 INCH SIOUX IA MESONET
MESONET STATION RTNI4, 1 WSW ORANGE CITY.
0145 AM HEAVY RAIN 6 NW ANOKA 43.02N 98.90W
09/20/2018 M2.81 INCH GREGORY SD MESONET
MESONET STATION E7290, BUTTE 8NNW.
1131 AM HEAVY RAIN 3 W DICKENS 43.13N 95.09W
09/19/2018 M2.83 INCH CLAY IA MESONET
MESONET STATION RSPI4, 3 W DICKENS.
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</html>PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1104 AM CDT THU SEP 20 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 AM HEAVY RAIN MINNEOTA 44.56N 95.98W
09/20/2018 M1.92 INCH LYON MN PUBLIC
REPORT VIA SOCIAL MEDIA. RAINFALL SUNRISE
WEDNESDAY TO 8 AM THURSDAY.
&&
TRMPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1119 AM CDT THU SEP 20 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0838 AM HEAVY RAIN 1 NW HULL 43.20N 96.15W
09/20/2018 E6.00 INCH SIOUX IA PUBLIC
REPORT VIA SOCIAL MEDIA. RAINFALL GREATER
THAN 6 INCHES.
0811 AM HEAVY RAIN HOSPERS 43.07N 95.90W
09/20/2018 E5.50 INCH SIOUX IA PUBLIC
REPORT VIA SOCIAL MEDIA. GREATER THAN 5.50
INCHES OF RAINFALL.
0902 AM HEAVY RAIN 10 WSW HURLEY 43.24N 97.28W
09/20/2018 M5.50 INCH TURNER SD PUBLIC
REPORT VIA SOCIAL MEDIA. RAINFALL FOR PAST 2
DAYS AT TURKEY RIDGE SD.
0700 AM HEAVY RAIN 3 SSE LAKE PARK 43.41N 95.30W
09/20/2018 M4.70 INCH DICKINSON IA PUBLIC
REPORT VIA SOCIAL MEDIA. RAINFALL IN 24
HOURS PRECEDING 7 AM 4.07 INCHES. STILL
RAINING LIGHTLY.
0930 AM HEAVY RAIN SPRINGFIELD 42.85N 97.89W
09/20/2018 M4.60 INCH BON HOMME SD PUBLIC
REPORT VIA SOCIAL MEDIA. RAINFALL PAST TWO
DAYS.
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</html>The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Much of Ellis has standing water, and water flowing over gravel roads west of Ellis.
Water was flowing over Madison Street at a depth of 8 to 10 inches east of La Mesa Drive.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2018Every state in 2018This day in weather historyWarnings in South Dakota, September 2018
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 2026-10-01. Each event’s entry at NCEI: 786121, 786120.