During the evening the group of thunderstorms from East Central Colorado moved into Northwest Kansas behind a cold front.  As the thunderstorms moved into Kansas they become an organized thunderstorm complex, turning into more of a wind threat than a hail threat.  Peak wind gusts from this event were estimated at 100 MPH from damage in Hoxie and in far southern Cheyenne County.  As this complex moved east, another area of prolonged thunderstorm activity behind the cold front was occurring over Graham County where several hours of heavy rainfall had occurred.  The many hours of prolonged rainfall added up to between four and six inches of rain for the northern half of Graham County, which lead to flash flooding in Hill City.  The largest hail size reported was golf ball at two different locations.

Thunderstorm Wind in SHERMAN, KANSAS
From 30-JUN-18 18:21:00 to 30-JUN-18 18:49:00 (MST-7)
Location: GOODLAND ARPT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in SHERMAN, KANSAS
From 30-JUN-18 18:21:00 to 30-JUN-18 18:21:00 (MST-7)
Location: CARUSO
Magnitude: 74.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

An estimated wind gust of 85 MPH was reported.

Thunderstorm Wind in SHERMAN, KANSAS
From 30-JUN-18 18:30:00 to 30-JUN-18 18:30:00 (MST-7)
Location: GOODLAND ARPT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Estimated the wind gusts to range from 60-70 MPH.

Thunderstorm Wind in SHERMAN, KANSAS
From 30-JUN-18 18:30:00 to 30-JUN-18 18:33:00 (MST-7)
Location: GOODLAND ARPT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Estimated the wind gusts to be 65 MPH.

Thunderstorm Wind in RAWLINS, KANSAS
From 30-JUN-18 19:38:00 to 30-JUN-18 19:38:00 (CST-6)
Location: BLAKEMAN
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Unknown number of tree limbs up to five inches in diameter were snapped off.

Thunderstorm Wind in SHERMAN, KANSAS
From 30-JUN-18 18:40:00 to 30-JUN-18 18:40:00 (MST-7)
Location: EDSON
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in SHERMAN, KANSAS
From 30-JUN-18 18:40:00 to 30-JUN-18 18:40:00 (MST-7)
Location: GOODLAND ARPT
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Wind speeds were estimated to be 60-70 MPH.

Thunderstorm Wind in SHERMAN, KANSAS
From 30-JUN-18 18:43:00 to 30-JUN-18 18:43:00 (MST-7)
Location: GOODLAND ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in RAWLINS, KANSAS
From 30-JUN-18 19:46:00 to 30-JUN-18 19:46:00 (CST-6)
Location: ATWOOD MUNI ARPT
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in SHERMAN, KANSAS
From 30-JUN-18 18:47:00 to 30-JUN-18 18:47:00 (MST-7)
Location: GOODLAND ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Estimated wind speeds of 60 MPH were reported.

Thunderstorm Wind in SHERMAN, KANSAS
From 30-JUN-18 18:04:00 to 30-JUN-18 18:04:00 (MST-7)
Location: KANORADO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Estimated wind gusts of 60 MPH were reported.

Thunderstorm Wind in THOMAS, KANSAS
From 30-JUN-18 20:03:00 to 30-JUN-18 20:03:00 (CST-6)
Location: COLBY
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Picture of a handheld anemometer with the wind speed measurement.

Thunderstorm Wind in THOMAS, KANSAS
From 30-JUN-18 20:03:00 to 30-JUN-18 20:03:00 (CST-6)
Location: COLBY MUNI ARPT
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in LOGAN, KANSAS
From 30-JUN-18 20:11:00 to 30-JUN-18 20:27:00 (CST-6)
Location: OAKLEY MUNI ARPT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in GOVE, KANSAS
From 30-JUN-18 20:27:00 to 30-JUN-18 20:27:00 (CST-6)
Location: GRINNELL
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in SHERIDAN, KANSAS
From 30-JUN-18 20:36:00 to 30-JUN-18 20:36:00 (CST-6)
Location: HOXIE
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in SHERIDAN, KANSAS
From 30-JUN-18 20:40:00 to 30-JUN-18 20:40:00 (CST-6)
Location: ANGELUS
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

An estimated wind gust of 75 MPH was reported.

Thunderstorm Wind in GOVE, KANSAS
From 30-JUN-18 21:05:00 to 30-JUN-18 21:05:00 (CST-6)
Location: GOVE
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in GOVE, KANSAS
From 30-JUN-18 21:00:00 to 30-JUN-18 21:00:00 (CST-6)
Location: QUINTER
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Wind gusts of 60-70 MPH were measured as the storms began to move through.

Flash Flood in GRAHAM, KANSAS
From 30-JUN-18 19:30:00 to 30-JUN-18 23:59:00 (CST-6)
Location: HILL CITY
Flood cause: Heavy Rain
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The flood waters moved into Hill City from the north, overwhelming the drainage tunnels under the town.  Water was deep enough in town to move into businesses.
Residents in the trailer park on the south side of town had to evacuate.  Two different families had to be water rescued due to their resistance to leave despite flood waters surrounding their home in both instances.  One trailer house was carried away by the flood waters.  A house in town, located near where the drainage tunnels empty, was engulfed with flood waters.  The city park and playground equipment, where the drainage for town empties, was almost completely submerged in water.  Over six inches of rainfall was measured in town.

Flash Flood in GRAHAM, KANSAS
From 30-JUN-18 19:30:00 to 30-JUN-18 23:59:00 (CST-6)
Location: NICODEMUS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The bridge west of Nicodemus was flooded.  No damage was reported.

Thunderstorm Wind in CHEYENNE, KANSAS
From 30-JUN-18 19:23:00 to 30-JUN-18 19:23:00 (CST-6)
Location: ST FRANCIS ARPT
Magnitude: 75.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

An unknown number of tree were blown down and a shed blew over the house.

Hail in SHERMAN, KANSAS
From 30-JUN-18 18:23:00 to 30-JUN-18 18:23:00 (MST-7)
Location: GOODLAND ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

The hail ranged from dime to golf ball in size.

Hail in GRAHAM, KANSAS
From 30-JUN-18 19:28:00 to 30-JUN-18 19:28:00 (CST-6)
Location: (HLC)HILL CITY MUNI
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail started out as pea size then grew to quarter size.

Hail in SHERMAN, KANSAS
From 30-JUN-18 18:30:00 to 30-JUN-18 18:50:00 (MST-7)
Location: GOODLAND ARPT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail ranged from pea to half dollar in size.

Hail in SHERMAN, KANSAS
From 30-JUN-18 18:40:00 to 30-JUN-18 18:40:00 (MST-7)
Location: GOODLAND ARPT
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in THOMAS, KANSAS
From 30-JUN-18 20:02:00 to 30-JUN-18 20:11:00 (CST-6)
Location: COLBY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The hail started out golf ball size then decreased to nickel size.

Thunderstorm Wind in CHEYENNE, KANSAS
From 30-JUN-18 19:03:00 to 30-JUN-18 19:03:00 (CST-6)
Location: ST FRANCIS ARPT
Magnitude: 61.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Public

An irrigation pivot was blown over.

Thunderstorm Wind in GRAHAM, KANSAS
From 30-JUN-18 19:15:00 to 30-JUN-18 19:15:00 (CST-6)
Location: HILL CITY
Magnitude: 70.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A very large tree limb was blown down in town.  On the northeast side of town a 25' tall tree was blown over and is blocking the road.

Thunderstorm Wind in SHERMAN, KANSAS
From 30-JUN-18 18:23:00 to 30-JUN-18 18:23:00 (MST-7)
Location: GOODLAND
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: NWS Employee

A large fire works tent was blown over near Walmart, road barricades were blown a quarter of a block in town, several four to five inch diameter tree limbs were blown down.

Thunderstorm Wind in GRAHAM, KANSAS
From 30-JUN-18 19:28:00 to 30-JUN-18 19:28:00 (CST-6)
Location: (HLC)HILL CITY MUNI
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Public

Unknown number of large tree limbs, estimated at five inches in diameter, were blown down.

Thunderstorm Wind in THOMAS, KANSAS
From 30-JUN-18 20:00:00 to 30-JUN-18 20:00:00 (CST-6)
Location: COLBY
Magnitude: 78.00 EG
Crop damage: 0.00K
Reported by: Public

Several power poles were damaged from the thunderstorm winds, causing all of Colby to not have power.  Power lines were blown down at the K-State research extension grounds causing a small fire.  However the rain put the fire out before any damage was done.  A window was broken at Orschlens.

Thunderstorm Wind in SHERIDAN, KANSAS
From 30-JUN-18 20:40:00 to 30-JUN-18 20:40:00 (CST-6)
Location: HOXIE
Magnitude: 87.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple large tree limbs blown down in town, and a four inch flag pole by the sheriff's office was bent in half.

Thunderstorm Wind in CHEYENNE, KANSAS
From 30-JUN-18 19:08:00 to 30-JUN-18 19:08:00 (CST-6)
Location: ST FRANCIS
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS