In the early afternoon hours on the 21st, a boundary began firing severe thunderstorms over Southwest Nebraska and Northwest Kansas. These storms generally moved to the north-northeast as the boundary moved east. In Nebraska, these storms produced wind gusts in excess of 80 mph, 2.5 inch diameter hail, and flash flooding.

Hail in RED WILLOW, NEBRASKA
From 21-SEP-23 18:46:00 to 21-SEP-23 18:46:00 (CST-6)
Location: LEBANON
Magnitude: 1.75 
Reported by: Law Enforcement

Sherriff reported 1.75 inch diameter hail.

Hail in RED WILLOW, NEBRASKA
From 21-SEP-23 19:25:00 to 21-SEP-23 19:25:00 (CST-6)
Location: DANBURY
Magnitude: 1.75 
Reported by: Law Enforcement

Red Willow County law enforcement relayed a report of windows broken by wind-driven hail in Danbury.

Hail in RED WILLOW, NEBRASKA
From 21-SEP-23 19:25:00 to 21-SEP-23 19:25:00 (CST-6)
Location: DANBURY
Magnitude: 1.75 
Reported by: Public

Report via social media with photo of estimated golf ball size hail in Danbury with second round of storms.

Thunderstorm Wind in RED WILLOW, NEBRASKA
From 21-SEP-23 16:00:00 to 21-SEP-23 16:00:00 (CST-6)
Location: MC COOK CULBERTSON A
Magnitude: 70.00 MG
Reported by: Mesonet

Mesonet station 9.5 miles SW of McCook, E9525.

Thunderstorm Wind in RED WILLOW, NEBRASKA
From 21-SEP-23 18:00:00 to 21-SEP-23 18:00:00 (CST-6)
Location: DANBURY
Magnitude: 55.00 MG
Reported by: Mesonet

Gust recorded 8ssw of Indianola, NE on a Nebraska state mesonet site.

Flash Flood in RED WILLOW, NEBRASKA
From 21-SEP-23 16:45:00 to 21-SEP-23 19:00:00 (CST-6)
Location: MC COOK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

McCook Dispatch reported several streets flooded along with Barnet Park and basements in several homes in the McCook area.

Hail in HITCHCOCK, NEBRASKA
From 21-SEP-23 14:55:00 to 21-SEP-23 14:55:00 (CST-6)
Location: BEVERLY
Magnitude: 2.50 
Reported by: Trained Spotter

Spotter driving a semi on Highway 6 ran into storm and had hail ranging from ping pong to tennis ball.

Hail in HITCHCOCK, NEBRASKA
From 21-SEP-23 15:40:00 to 21-SEP-23 15:40:00 (CST-6)
Location: CULBERTSON
Magnitude: 1.75 
Reported by: Trained Spotter

Trained spotter reported 1.75 inch diameter hail in Culbertson.

Hail in HITCHCOCK, NEBRASKA
From 21-SEP-23 15:43:00 to 21-SEP-23 15:43:00 (CST-6)
Location: CULBERTSON
Magnitude: 1.50 
Reported by: Public

Public report of 1.5 inch diameter hail becoming heavy rain.

Hail in HITCHCOCK, NEBRASKA
From 21-SEP-23 15:50:00 to 21-SEP-23 15:50:00 (CST-6)
Location: CULBERTSON
Magnitude: 1.50 
Reported by: Trained Spotter

Trained spotter reported 1.5 inch diameter hail east of Culbertson.

Hail in RED WILLOW, NEBRASKA
From 21-SEP-23 16:35:00 to 21-SEP-23 16:35:00 (CST-6)
Location: MC COOK
Magnitude: 1.25 
Reported by: Trained Spotter

Hail on the ground following the storm ranged from nickel to half dollar sized.

Hail in RED WILLOW, NEBRASKA
From 21-SEP-23 16:30:00 to 21-SEP-23 16:30:00 (CST-6)
Location: MC COOK
Magnitude: 2.00 
Reported by: Public

Report received of hail up to 2 inches in diameter.

Hail in RED WILLOW, NEBRASKA
From 21-SEP-23 17:00:00 to 21-SEP-23 17:00:00 (CST-6)
Location: MC COOK
Magnitude: 0.88 
Reported by: Public

Pea to nickel sized hail east of McCook.

Hail in RED WILLOW, NEBRASKA
From 21-SEP-23 17:15:00 to 21-SEP-23 17:15:00 (CST-6)
Location: MARION
Magnitude: 1.00 
Reported by: Trained Spotter

Trained spotter reported 1 inch diameter hail.

Hail in RED WILLOW, NEBRASKA
From 21-SEP-23 18:00:00 to 21-SEP-23 18:35:00 (CST-6)
Location: DANBURY
Magnitude: 1.00 
Reported by: Public

Report via social media of constant hail pea to quarter size between 7 to 735 pm CDT with first round of storms through Danbury.

Hail in RED WILLOW, NEBRASKA
From 21-SEP-23 18:11:00 to 21-SEP-23 18:11:00 (CST-6)
Location: DANBURY
Magnitude: 1.75 
Reported by: Trained Spotter

Trained spotter reported golf ball sized hail in Danbury.