Additional heavy rain during the early morning hours of September 5th and 7th brought flash-flooding across portions of the area.
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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 TOP wrote it up.
Additional heavy rain during the early morning hours of September 5th and 7th brought flash-flooding across portions of the area.
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 Topeka, KS wrote its last area forecast discussion before the first event at Sep 5, 2:22 AM CST, 2 hours 38 minutes earlier.
Area Forecast Discussion National Weather Service Topeka KS 322 AM CDT Wed Sep 5 2018 .SHORT TERM...(Today and tonight) Issued at 322 AM CDT Wed Sep 5 2018 As of 08Z Wednesday morning broad southwesterly midlevel flow continues across the central Plains. A slow moving surface trough axis extended from west TX northeastward through northern WI. Deep Gulf of Mexico moisture continues to reside south of this surface boundary, characterized by dew points in the lower 70s with PWAT values between 1.9 and 2.2 inches. Scattered rain showers have once again began developing across the CWA in response to impressive moisture transport vectors between 925 mb and 850 mb. Further enhancement and coverage of shower and thunderstorm activity is expected after 08/09Z as a weak perturbation across the TX and OK Panhandle region traverses eastern KS. With the tropical-like environment across the region coupled with upwards of 600 J/kg of MUCAPE, rainfall rates could exceed 1 inch per hour at times, especially through midday. 00Z guidance is in decent agreement with two regions of heaviest QPF through the morning hours. The first looks to focus from the Ottawa/Dickinson counties, northeastward through Riley and Pottawatomie counties. 00Z CAM and recent trends of the HRRR and RAP suggest 1-2 inches will be likely in this corridor with locally higher amounts possible. This matches up well with radar trends over the past 30 minutes, with an axis of moderate to heavy rainfall setting up from Ottawa County to eastern Pottawatomie County. Given the recent rainfall in this region, additional FLASH-FLOODING and river flooding is possible. At time point will allow the ongoing Flash-Flood Watch to expire at 18Z as the bulk of heaviest rainfall is expected to be south and east of this area by afternoon. The second axis of heavier QPF is progged along and east of Highway 75. 1-2 of rainfall is likely through Wednesday evening across this region. Given the lack of significant rainfall over the past few days, the threat for Flash-Flooding is tempered as soil and river conditions are largely dry. The best potential for shower and thunderstorm activity will shift eastward through the afternoon as the surface trough sinks southward into the CWA, shunting the best moisture transport southeastward. Isolated to scattered thunderstorms will remain possible throughout the afternoon and early evening as forecast soundings suggest an uncapped mixed-layer parcels. Given the lack of large scale ascent, activity should remain isolated to scattered at best. Shower and isolated thunderstorm chances will continue tonight as the surface trough axis stalls across southwest MO. Little if any CAA will be noted behind the boundary, at least initially. Therefore, plentiful moisture will remain across the CWA with weak perturbations continuing to translate through the flow, contributing to rain chances. Any rainfall contribution from the remnants of TS Gordon look to hold off until the daytime hours Thursday. As far as temperatures go, cloudy skies with scattered showers and storms will yield highs in the mid to upper 70s this afternoon. Lows tonight are progged to range from the low 60s in north-central KS to the upper 60s in east-central KS. .LONG TERM...(Thursday through Tuesday) Issued at 322 AM CDT Wed Sep 5 2018 Precipitation chances will continue across the forecast area through the day on Saturday. Remnants of Gordon are forecast to move northward into northwest Arkansas on Friday before being absorbed by the mid level trough and moving east across Missouri on Saturday. Tropical moisture will remain over central and eastern Kansas initially on Thursday, then focus mainly over northeast and east central Kansas late Thursday through Saturday. The approach of the remnants of Gordon will focus lift in the northern and eastern quadrants of the system and transport deep tropical moisture northward into eastern Kansas and Missouri. 850 mb moisture convergence and transport of high theta air support ongoing concerns for high precipitation efficiency Thursday night through early Saturday morning. Have trended higher than model consensus for precipitation amounts over eastern Kansas, although much higher QPF amounts will be focused east of the forecast area over Missouri. Isentropic lift over the frontal boundary Friday into Saturday support increasing qpf amounts across eastern Kansas. Saturday night into Sunday dryer air will move into eastern Kansas with the passage of the mid level trough axis and associated subsidence overspreading central and eastern Kansas. A dry northwest to westerly flow is expected aloft while a surface ridge axis extended into eastern Kansas on Sunday gradually moving off to the east Monday and Tuesday. Return flow on the backside of the high focuses off to the western plains. Highs in the 70s are expected Thursday through Monday with temperatures warming back into the 80s by next Tuesday. && .AVIATION...(For the 06Z TAFS through 06Z Wednesday night) Issued at 1155 PM CDT Tue Sep 4 2018 Main concerns are timing of precipitation and onset of lower ceilings. Strong guidance signal continues for increasing shower trends around 12Z with backing winds resulting in generally lowering ceilings with IFR appearing likely by 01Z Thursday. && .TOP WATCHES/WARNINGS/ADVISORIES... Flash Flood Watch until 1 PM CDT this afternoon for KSZ008>011- 020>023-034>036. && SHORT TERM...Baerg LONG TERM...53 AVIATION...65
Hazardous Weather Outlook National Weather Service Topeka KS 432 AM CDT Wed Sep 5 2018 KSZ008>011-020>023-034>036-060945- Republic-Washington-Marshall-Nemaha-Cloud-Clay-Riley-Pottawatomie- Ottawa-Dickinson-Geary- 432 AM CDT Wed Sep 5 2018 This hazardous weather outlook is for east central...north central and northeast Kansas. .DAY ONE...Today and Tonight. A flash flood watch remains in effect for the area 1 PM this afternoon. Please see the National Weather Service website at weather.gov/top for more information. Minor to moderate flooding will develop or continue on several rivers and creeks in north central and northeast Kansas today. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Additional shower and thunderstorm chances will allow the threat for flash flooding and river flooding to continue through Friday night. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed through tonight. && More detailed information can be accessed at... http://www.weather.gov/top/sitrep KSZ012-024-026-037>040-054>056-058-059-060945- Brown-Jackson-Jefferson-Morris-Wabaunsee-Shawnee-Douglas-Lyon- Osage-Franklin-Coffey-Anderson- 432 AM CDT Wed Sep 5 2018 This hazardous weather outlook is for east central...north central and northeast Kansas. .DAY ONE...Today and Tonight. Scattered showers and thunderstorms are expected across the area. Heavy rainfall could result in localized flash flooding. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Additional shower and thunderstorm chances will allow the threat for flash flooding and river flooding to continue through Friday night. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed through tonight. && More detailed information can be accessed at... http://www.weather.gov/top/sitrep
The Topeka radar (KTWX), 100 km away, was scanning. The volume nearest the first event began at 11:01 UTC.
13 flash flood. Local standard time, as filed.
Water was running over the road just west of the K-15 and K-9 intersection.
Water was running over 30th road between Prairie and Quail roads.
Water was flowing over the road at 26th and Jayhawk.
Water was flowing over the road near 23rd and Hackberry road.
Water was reported over Highway 77 near the 7th road intersection.
Report of 5 to 6 roads closed in Le Roy due to high water. 2.93 inches of rain was reported in the last 2 hours.
Water over 1750 road about 1.5 miles east of the Garnett airport.
Water flowing over Highway 59 at 1st Street in Garnett.
Flash-flooding was reported at the park in the southeast portion of Westphalia.
Approximately 4 inches of water was covering the roadway.
The roadway was closed due to water across the road.
Observer reported that 8 to 10 inches of water had backed into their front yard, which is very abnormal.
High water closed 1600 road between Iowa and Indiana roads.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Kansas in 2018Every state in 2018This day in weather historyWarnings in Kansas, 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 2026-09-24. Each event’s entry at NCEI: 787298, 787301, 787303, 787304, 787306, 787332, 787333, 787335, 787337, 787339, 787341, 787344, 787348.