Given that several official NWS cooperative observer stations within this six-county North Central Kansas area realized their wettest month of August on record (including Plainville 4WNW, Natoma and Beloit), it should come as no surprise that there were at least a few rounds of flooding rains. For some areas mainly south of the Highway 36 corridor, the roughly 48-hour period from the morning of Friday the 23rd through the pre-dawn hours of Sunday the 25th was one of the wettest stretches of the month, with widespread rain totals commonly 2-5+. Over the course of these few days, the main event focused during a 12-hour block between 5 p.m. CDT on the 24th and 5 a.m. CDT on the 25th, as numerous, slow-moving thunderstorms traversed the area. Although radar signatures suggested there might have been a few instances of large hail/damaging winds late in the evening (as storms organized into a linear MCS before departing southward into central Kansas), there was no ground-truth verification. Certainly though, the main story of the night was heavy rain and flooding, especially within Rooks, northern Osborne and far southern Smith counties, where a few mesonets confirmed totals of 4-5 in the Downs, Portis and Harlan areas. Limited ground-truth flash flooding reports included a gravel road washed out north of Webster State Park and several inches of water flowing over a gravel road southeast of Alton. Undoubtedly, several rural roads and small creeks experienced short-term flooding from this heavy rain event. In addition, several area river gauges breached at least minor flood stage for anywhere from a few hours to a few days, including: Solomon River near Glen Elder, North Fork Solomon near Portis and South Fork Solomon near Woodston. More notably, the South Fork Solomon near Osborne went into moderate flood, with a crest of 21.37 on the evening of the 25th preliminarily ranking as the 5th-highest on record (and  highest since 1993).
In the mid-upper levels, the Central Plains was mired in a multi-day stretch of somewhat active and wet weather during this time frame. Specifically from the 24th into the 25th, a low-amplitude disturbance tracked southeastward from the Central High Plains toward central Kansas, downstream from a larger-scale trough centered over southwestern Canada. As typical, the maintenance/intensification of convection after dark was augmented by warm air/moisture advection within a modest, 25-35 knot low level jet axis. Heavy rain rates were supported by a moist profile featuring precipitable water values of 1.50-2.00.

Flash Flood in ROOKS, KANSAS
From 24-AUG-19 23:00:00 to 25-AUG-19 05:00:00 (CST-6)
Location: WEBSTER RES
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: County Official

Flash flooding washed out County Road 6, just south of County Road H.

Heavy Rain in SMITH, KANSAS
From 24-AUG-19 18:00:00 to 25-AUG-19 06:00:00 (CST-6)
Location: HARLAN
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Mesonet

A 12-hour rainfall total of 4.82 inches was measured 2 miles north-northwest of Portis. A 12-hour rainfall total of 4.20 inches of rain was measured 2 miles south-southwest of Harlan.

Heavy Rain in OSBORNE, KANSAS
From 24-AUG-19 18:00:00 to 25-AUG-19 06:00:00 (CST-6)
Location: DOWNS
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Mesonet

A 12-hour total rainfall of 4.69 inches was measured in Downs.

Flash Flood in OSBORNE, KANSAS
From 24-AUG-19 23:00:00 to 25-AUG-19 05:00:00 (CST-6)
Location: ALTON
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Social Media

Radar estimation and a few gauge reports indicated that 3 to 5 inches of rain fell across northern Osborne County during the evening-overnight. A social media post and photo showed several inches of water flowing rapidly over a county road a few miles southeast of Alton. Other county roads were likely impacted by the heavy rainfall as well.