Severe thunderstorms developed across a good portion of eastern Iowa and northwest Illinois on the afternoon of Tuesday August 24th, 2021. A corridor of very strong winds was observed along the Highway 20 corridor from Fairbank IA, to Hazelton IA and to Manchester IA, where numerous reports of damage to trees, homes and power outages were received. Hail up to golf ball size was also observed in Manchester IA.
Storms continued to track south and east, with an outflow boundary producing strong winds into portions of northwest Illinois including the Quad Cities metro. Additional reports of wind damage were received across northwest Illinois, with a 66 MPH wind gust measured at the Savanna, IL AWOS.

Thunderstorm Wind in DUBUQUE, IOWA
From 24-AUG-21 14:58:00 to 24-AUG-21 14:58:00 (CST-6)
Location: DYERSVILLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Very strong winds reported.

Thunderstorm Wind in DUBUQUE, IOWA
From 24-AUG-21 15:00:00 to 24-AUG-21 15:00:00 (CST-6)
Location: DYERSVILLE
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Measured at the fire station.

Thunderstorm Wind in DUBUQUE, IOWA
From 24-AUG-21 15:00:00 to 24-AUG-21 15:00:00 (CST-6)
Location: WORTHINGTON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large pine tree was blown down across a road near town.

Hail in DELAWARE, IOWA
From 24-AUG-21 14:26:00 to 24-AUG-21 14:26:00 (CST-6)
Location: MANCHESTER ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Thunderstorm Wind in DELAWARE, IOWA
From 24-AUG-21 14:25:00 to 24-AUG-21 14:25:00 (CST-6)
Location: MANCHESTER
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A roof peeled off a downtown building, with several trees blown down in downtown.

Thunderstorm Wind in BUCHANAN, IOWA
From 24-AUG-21 13:52:00 to 24-AUG-21 13:52:00 (CST-6)
Location: HAZLETON
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Very strong winds reported.

Thunderstorm Wind in BUCHANAN, IOWA
From 24-AUG-21 13:55:00 to 24-AUG-21 13:55:00 (CST-6)
Location: INDEPENDENCE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A large 8-10 inch diameter branch blown down.

Thunderstorm Wind in BUCHANAN, IOWA
From 24-AUG-21 13:50:00 to 24-AUG-21 13:50:00 (CST-6)
Location: FAIRBANK
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several large tree limbs blown down.

Thunderstorm Wind in DELAWARE, IOWA
From 24-AUG-21 14:41:00 to 24-AUG-21 14:41:00 (CST-6)
Location: ONEIDA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Very strong winds reported.

Thunderstorm Wind in JACKSON, IOWA
From 24-AUG-21 15:55:00 to 24-AUG-21 15:55:00 (CST-6)
Location: BELLEVUE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several 2 inch diameter branches blown down.

Thunderstorm Wind in CLINTON, IOWA
From 24-AUG-21 16:14:00 to 24-AUG-21 16:14:00 (CST-6)
Location: CLINTON MUNI ARPT
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Clinton Airport wind observation.

Thunderstorm Wind in DELAWARE, IOWA
From 24-AUG-21 14:19:00 to 24-AUG-21 14:19:00 (CST-6)
Location: MANCHESTER ARPT
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

EM relayed a report of a pole barn flattened northwest of Manchester.

Thunderstorm Wind in DELAWARE, IOWA
From 24-AUG-21 14:53:00 to 24-AUG-21 14:53:00 (CST-6)
Location: HOPKINTON
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several large trees down in town.

Thunderstorm Wind in DUBUQUE, IOWA
From 24-AUG-21 15:15:00 to 24-AUG-21 15:15:00 (CST-6)
Location: BERNARD
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A grain bin and detached garage destroyed.

Hail in DUBUQUE, IOWA
From 24-AUG-21 15:33:00 to 24-AUG-21 15:33:00 (CST-6)
Location: (DBQ)DUBUQUE MUNI AR
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report received through social media.

Thunderstorm Wind in DUBUQUE, IOWA
From 24-AUG-21 15:36:00 to 24-AUG-21 15:36:00 (CST-6)
Location: (DBQ)DUBUQUE MUNI AR
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Dubuque Airport observation.

Thunderstorm Wind in BUCHANAN, IOWA
From 24-AUG-21 13:50:00 to 24-AUG-21 13:50:00 (CST-6)
Location: HAZLETON
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Two large trees blown down with power lines damaged.

Hail in DUBUQUE, IOWA
From 24-AUG-21 14:58:00 to 24-AUG-21 14:58:00 (CST-6)
Location: DYERSVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in BUCHANAN, IOWA
From 24-AUG-21 13:50:00 to 24-AUG-21 13:50:00 (CST-6)
Location: FONTANA COUNTY PARK
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Very strong winds reported.

Thunderstorm Wind in BUCHANAN, IOWA
From 24-AUG-21 13:50:00 to 24-AUG-21 13:50:00 (CST-6)
Location: FONTANA COUNTY PARK
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several trees were uprooted south of Hazelton, near the Fontana turnoff.