During the late afternoon and through most of the night strong to severe thunderstorms developed and trained along a surface boundary.  The storms slowly moved east across parts of Northwest Kansas.  The largest hail reported was quarter size in far northern Cheyenne County.  The highest wind gust reported was 59 MPH at Goodland.  The main impact from these storms was flash flooding over Cheyenne, Decatur, Norton, and Graham counties where estimated rainfall amounts of up to ten inches fell.  Many roads in northern Cheyenne County had washouts three to four feet deep, with a few washouts eight to twelve feet deep.  Road crews had to remove silt off Highway 36 west of Bird City where water flowed over the road.  The worst of the flooding was over southern Norton and northern Graham counties where numerous roads were washed out and Lenora was flooded.  The flash flooding transitioned to flooding during the overnight hours as the moderate to heavy rainfall moved to the east.  Swift water rescues were conducted in southern Norton County.  One fatality was reported from the flooding in Norton County.  The flooding persisted into the evening of the fourth.

Hail in CHEYENNE, KANSAS
From 03-SEP-16 18:25:00 to 03-SEP-16 18:25:00 (CST-6)
Location: BIRD CITY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail in CHEYENNE, KANSAS
From 03-SEP-16 18:45:00 to 03-SEP-16 18:45:00 (CST-6)
Location: BIRD CITY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Hail was accompanied by estimated wind gusts of 50 MPH.

Thunderstorm Wind in SHERMAN, KANSAS
From 03-SEP-16 18:02:00 to 03-SEP-16 18:14:00 (MST-7)
Location: GOODLAND ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in SHERMAN, KANSAS
From 03-SEP-16 18:33:00 to 03-SEP-16 18:37:00 (MST-7)
Location: GOODLAND ARPT
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Flash Flood in NORTON, KANSAS
From 03-SEP-16 22:00:00 to 04-SEP-16 04:00:00 (CST-6)
Location: NEW ALMELO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The North Fork of the Solomon River was out of its banks causing all of Lenora to be flooded, along with a stretch of Highway 9 coming into town as well as elsewhere in the southern part of the county.   Swift water rescues occurred in the southern part of Norton county during the late evening of the third.  One of these rescues involved a couple who under estimated the depth of the water over the highway and drove through the flood waters on Highway 9.  The vehicle was washed off the road and caught in a tree.  The couple escaped from the vehicle and climbed into the tree, remaining there until rescuers arrived.  There was one direct fatality from the flooding.  The individual was driving north from Graham County on county roads toward Lenora.  He drove into flood waters, under estimating their depth.  His vehicle was washed off the road.  His body was found a quarter mile away from the vehicle.  In general, the majority of the rainfall fell south of CR W.  Rainfall amounts of five to seven inches were common across southern Norton County.  No information was given for property damage.

Flood in NORTON, KANSAS
From 04-SEP-16 04:00:00 to 04-SEP-16 20:00:00 (CST-6)
Location: NEW ALMELO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

As of 2 PM CST water is still covering many roads and bridges in the south part of the county.  Prairie Dog Creek and the North Fork of the Solomon River continue to be out of their banks.  No information was given for property damage.

Flash Flood in GRAHAM, KANSAS
From 03-SEP-16 22:20:00 to 04-SEP-16 04:00:00 (CST-6)
Location: BIRD CITY ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Bow Creek in the north part of the county is out of its banks.  There is extensive flooding of county roads in the north part of the county, with an estimated seven inches of water over the roads early in the event.  Water is covering Highway 283 in several locations in the northern part of the county, with debris floating across the highway.  No report was given for property damaged by flooding.

Flood in GRAHAM, KANSAS
From 04-SEP-16 04:00:00 to 04-SEP-16 20:00:00 (CST-6)
Location: NICODEMUS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Around sunrise campers at Antelope Lake reported flood waters up to the steps of their camper, almost covering the tires.  Estimated the water to be at least a foot deep.  Roads in southern Norton County, where similar amounts of rain fell, were reported to still covered in water by mid afternoon.  Using this report as a proxy, roads in northern Graham County were likely to still be covered by flood waters for a similar period of time.  No information was given for estimates of property damage.

Flash Flood in DECATUR, KANSAS
From 03-SEP-16 22:20:00 to 04-SEP-16 04:00:00 (CST-6)
Location: JENNINGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The bridge north of Jennings was reported to be underwater the following morning due to heavy rainfall from the nighttime.  No damage was reported.

Flood in DECATUR, KANSAS
From 04-SEP-16 04:00:00 to 04-SEP-16 18:00:00 (CST-6)
Location: JENNINGS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

During the morning the bridge north of Jennings was reported to be underwater. Estimated the flooding to have receded close to the same time the flood waters in Norton and Graham county receded.  No damage was reported.

Flash Flood in CHEYENNE, KANSAS
From 03-SEP-16 22:45:00 to 04-SEP-16 00:45:00 (CST-6)
Location: ST FRANCIS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Prolonged heavy rainfall caused runoff to erode a three to three and a half feet deep ditch  along the side of the road near the CR R/CR 3 intersection exposing a gas line.

Flash Flood in CHEYENNE, KANSAS
From 03-SEP-16 22:45:00 to 04-SEP-16 00:45:00 (CST-6)
Location: ST FRANCIS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Prolonged heavy rainfall caused the east half of a 42 culvert to be washed out just south of the CR P/CR 6 intersection.  The resulting hole around the culvert was four to five feet deep.

Flash Flood in CHEYENNE, KANSAS
From 03-SEP-16 22:45:00 to 04-SEP-16 00:45:00 (CST-6)
Location: ST FRANCIS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Runoff from prolonged heavy rainfall carved a three to three and a half feet deep ditch down the hill along the south side of CR W just east of the CR W/CR 12 intersection.  The ditch was deep enough to expose fiber tape near the gas line that crossed under the road.

Flash Flood in CHEYENNE, KANSAS
From 03-SEP-16 22:45:00 to 04-SEP-16 00:45:00 (CST-6)
Location: WHEELER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Runoff from prolonged heavy rainfall caused the roadway, which cuts several feet into the hill, to be washed out.  The washout was two and a half to three feet deep down the hill.  This is in the vicinity of CR 19 and CR CC.

Flash Flood in CHEYENNE, KANSAS
From 03-SEP-16 22:45:00 to 04-SEP-16 00:45:00 (CST-6)
Location: WHEELER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Runoff from prolonged heavy rainfall caused a draw on the east side of CR 19 to washout back across onto the road.  The washout was eight to twelve feet deep.

Flash Flood in CHEYENNE, KANSAS
From 03-SEP-16 22:45:00 to 04-SEP-16 00:45:00 (CST-6)
Location: WHEELER
Flood cause: Heavy Rain
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Drought Monitor

Eight feet of road was washed out around a culvert on CR 19 between CR BB and CR AA.  The washout also exposed a phone line running under the road.  The culvert had to be replaced.