Strong to severe slow moving thunderstorms moved northerly across Northwest Kansas.   Large hail up to golf ball size was reported across Northwest Kansas, with the largest stone reported north of Winona. The slow moving storms produced wide spread heavy across Northwest Kansas.  The prolonged rainfall caused the Smokey River in far western Logan County to flood several county roads.  Flooding also occurred south of Edson in Sherman county where small streams at the headwaters of the South Fork of the Sappa or the North Fork of the Smokey flooded county roads.  The most pronounced flooding occurred in Gove County where over four inches of heavy rainfall flooded Grinnell.  The water in Grinnell was higher than car tires and was carrying logs through town.  A motorist in Grinnell drove into a flooded roadway and had to be rescued.  The flood waters then traveled down Big Creek, causing Big Creek to go out of its banks.  Due to the heavy rainfall of three to seven inches occurring over the west half of Gove County along Big Creek from Grinnell to south of Grainfield, flood waters in Big Creek continue across the rest of the county, flooding county roads that crossed it.  The flood waters were within five feet of the bottom of the bridge on the Gove/Trego County line the evening of the 11th.

Flash Flood in LOGAN, KANSAS
From 10-MAY-17 22:00:00 to 11-MAY-17 01:00:00 (CST-6)
Location: OAKLEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Three to seven inches of rain fell just northwest of the Highway 40/CR 400 intersection, with the higher amounts uphill just across the county line.  The flood waters from the heavy rainfall were over Highway 40 a half mile west of this intersection.

Flood in LOGAN, KANSAS
From 11-MAY-17 01:00:00 to 11-MAY-17 03:00:00 (CST-6)
Location: OAKLEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flood waters continued running over Highway 40 after the rainfall ended.

Flash Flood in LOGAN, KANSAS
From 11-MAY-17 00:00:00 to 11-MAY-17 03:00:00 (CST-6)
Location: MONUMENT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Three to four inches of heavy rain fell causing flood waters to run over CR 380 a half mile south of Highway 40.

Hail in SHERMAN, KANSAS
From 10-MAY-17 15:17:00 to 10-MAY-17 15:17:00 (MST-7)
Location: GOODLAND
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The hail was reported near CR 62 on Highway 27.

Hail in THOMAS, KANSAS
From 10-MAY-17 17:33:00 to 10-MAY-17 17:33:00 (CST-6)
Location: COLBY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in THOMAS, KANSAS
From 10-MAY-17 17:45:00 to 10-MAY-17 17:45:00 (CST-6)
Location: BROWNVILLE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WALLACE, KANSAS
From 10-MAY-17 17:00:00 to 10-MAY-17 17:00:00 (MST-7)
Location: SHARON SPGS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in WALLACE, KANSAS
From 10-MAY-17 17:09:00 to 10-MAY-17 17:09:00 (MST-7)
Location: SHARON SPGS ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in LOGAN, KANSAS
From 10-MAY-17 18:20:00 to 10-MAY-17 18:37:00 (CST-6)
Location: WINONA
Magnitude: 1.75 
Property damage: 0.30K
Crop damage: 0.00K
Reported by: Trained Spotter

The hail lasted 15-20 minutes, covering the yard and damaged an awning.

Hail in GOVE, KANSAS
From 10-MAY-17 20:53:00 to 10-MAY-17 20:53:00 (CST-6)
Location: GRINNELL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A car and a semi have both slid off I-70 between mile markers 83 and 85 due to nickel and pea size hail covering the road.  No injuries were reported.

Hail in GOVE, KANSAS
From 10-MAY-17 21:27:00 to 10-MAY-17 22:32:00 (CST-6)
Location: GOVE
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Trained Spotter

The hail size started out at quarter size then increased to ping-pong ball size toward the end.

Hail in SHERIDAN, KANSAS
From 10-MAY-17 21:52:00 to 10-MAY-17 21:52:00 (CST-6)
Location: ANGELUS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A mix of rain and hail continued through 3 AM CDT.  No hail size was given past the time of this report.

Flash Flood in GOVE, KANSAS
From 10-MAY-17 21:10:00 to 10-MAY-17 23:59:00 (CST-6)
Location: GRINNELL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water rose above the wheels of cars and floated logs down the streets.  A motorist drove into a flooded roadway and ended up in a street drainage.  The person was safely removed from their car.  No reports of property damage were given.  Total rainfall in Grinnell was 4.11 inches.

Flood in THOMAS, KANSAS
From 11-MAY-17 07:00:00 to 11-MAY-17 10:00:00 (CST-6)
Location: SPICA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water was running over the bridge on CR 30 a mile north of Oakley.

Flood in LOGAN, KANSAS
From 11-MAY-17 07:00:00 to 11-MAY-17 12:00:00 (CST-6)
Location: MC ALLASTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Driveway from CR 100 running across the Smokey was flooded preventing residents from going to town.

Flood in LOGAN, KANSAS
From 11-MAY-17 07:00:00 to 11-MAY-17 12:00:00 (CST-6)
Location: MC ALLASTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The Smokey River was out of its banks and had water over CR 110 that ran across the river.

Flood in LOGAN, KANSAS
From 11-MAY-17 07:00:00 to 11-MAY-17 12:00:00 (CST-6)
Location: MC ALLASTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The Smokey River was out of its banks and had water over CR 130 which ran across the river.

Flash Flood in SHERMAN, KANSAS
From 11-MAY-17 00:00:00 to 11-MAY-17 03:00:00 (MST-7)
Location: EDSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Between three and five inches of rain fell causing one of the streams at the headwaters of the South Fork of the Sappa to flood CR 30 about a third of a mile south of the CR 59/30 intersection.

Flood in SHERMAN, KANSAS
From 11-MAY-17 03:00:00 to 11-MAY-17 11:00:00 (MST-7)
Location: EDSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Between three and five inches of rain fell causing one of the streams at the headwaters of the South Fork of the Sappa to flood CR 30 about a third of a mile south of the CR 59/30 intersection.

Flash Flood in SHERMAN, KANSAS
From 11-MAY-17 00:00:00 to 11-MAY-17 03:00:00 (MST-7)
Location: EDSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Three to four inches of rain fell causing a stream at the headwaters of the North Fork of the Smokey River to flood CR 27 1.5 S of the CR 57/27 intersection.

Flash Flood in SHERMAN, KANSAS
From 11-MAY-17 00:00:00 to 11-MAY-17 03:00:00 (MST-7)
Location: EDSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Three to five inches of rain fell causing a stream to flood CR 26 1.5 S of the CR 61/26 intersection.  This stream is at the headwaters of the South Fork of the Sappa.

Flood in SHERMAN, KANSAS
From 11-MAY-17 03:00:00 to 11-MAY-17 11:00:00 (MST-7)
Location: EDSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Three to five inches of rain fell causing a stream to flood CR 26 1.5 S of the CR 61/26 intersection. This stream is at the headwaters of the South Fork of the Sappa.

Flash Flood in GOVE, KANSAS
From 10-MAY-17 23:00:00 to 11-MAY-17 04:00:00 (CST-6)
Location: GRINNELL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

After Big Creek flooded Grinnell the flood waters continued down the creek channel through the rest of the county, flooding county roads that crossed the creek.  Total rainfall along Big Creek from Grinnell to Highway 23 south of Grainfield was 5-10 inches.  The runoff from this heavy rainfall further added to the water running down Big Creek.

Flood in GOVE, KANSAS
From 11-MAY-17 04:00:00 to 11-MAY-17 10:00:00 (CST-6)
Location: GRINNELL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Once the heavy rain ended the amount of water in Big Creek gradually dwindled from west to east.

Flood in GOVE, KANSAS
From 11-MAY-17 04:00:00 to 11-MAY-17 23:59:00 (CST-6)
Location: GRAINFIELD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The flood waters in Big Creek from west of Highway 23 continued east through the rest of the county, flooding county roads that crossed Big Creek.  At 1:40 PM CST 8-10 inches of water 200-300 ft. across was reported over Castle Rock Road a quarter mile north of the CR W/Castle Rock intersection.

Flash Flood in LOGAN, KANSAS
From 10-MAY-17 22:00:00 to 11-MAY-17 01:00:00 (CST-6)
Location: PAGE CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Three to five inches fell near the intersection of CR 260 and Highway 25, with the higher amounts upstream from this location.  Flooding from the heavy rainfall ran over CR 260 just north of this intersection.

Hail in SHERMAN, KANSAS
From 10-MAY-17 15:33:00 to 10-MAY-17 15:33:00 (MST-7)
Location: EDSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter