There were two rounds of severe thunderstorms on April 4th. The first round in Illinois occurred during the morning hours.  These storms developed in eastern Iowa and moved into northwest Illinois by mid morning.  Despite the elevated nature of the storms and a very stable low level, a very strong downdraft surge occurred south of the hail core over the Illinois side of the Quad Cities metro, with the Quad City Airport ASOS measuring a wind gust near 90 MPH. Extensive damage occurred from Rock Island to Colona IL to buildings, trees and power poles, with some structures seeing ripped-off roofs. A survey team determined a brief tornadoes touched down in Moline, Colona, and near Geneseo Illinois.

Hail in BUREAU, ILLINOIS
From 04-APR-23 10:30:00 to 04-APR-23 10:30:00 (CST-6)
Location: ARLINGTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CARROLL, ILLINOIS
From 04-APR-23 10:35:00 to 04-APR-23 10:35:00 (CST-6)
Location: MILLEDGEVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

The Milledgeville Fire Department hail ranging in size from pea to quarter.

Tornado in ROCK ISLAND, ILLINOIS
From 04-APR-23 08:36:00 to 04-APR-23 08:37:00 (CST-6)
Location: ANDALUSIA
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief tornado caused sporadic damage to power poles, some trees, and some houses on its 1 mile path. Estimated max wind speeds of 105 mph.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 04-APR-23 08:37:00 to 04-APR-23 08:37:00 (CST-6)
Location: MILAN
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public report of roof damage, down trees with the roots exposed and a semi trailer blown over.

Hail in HENRY, ILLINOIS
From 04-APR-23 09:25:00 to 04-APR-23 09:25:00 (CST-6)
Location: HOOPPOLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BUREAU, ILLINOIS
From 04-APR-23 10:34:00 to 04-APR-23 10:34:00 (CST-6)
Location: CHERRY
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in HENRY, ILLINOIS
From 04-APR-23 09:20:00 to 04-APR-23 09:20:00 (CST-6)
Location: ATKINSON
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public report of a semi trailer blown over 3 miles west of Atkinson on Interstate 80.

Tornado in HENRY, ILLINOIS
From 04-APR-23 08:57:00 to 04-APR-23 08:58:00 (CST-6)
Location: GREEN ROCK
Tornado F-scale: EF2
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief tornado developed Tuesday morning in Colona, Illinois, and was embedded in a broader swath of damaging straight line winds. The tornado was on the ground for 0.4 miles and west 50 yards wide.  the peak estimated winds were 115 MPH. The tornado moved through the northern portion of Colona, and was on the ground for about a half mile. The tornado was captured on video, ripping the entire roof off a gas station and tossing it into a brick building just to the south. The front wall of the building also collapsed. The tornado also uprooted trees, and caused minor house damage.The tornado was rated a low-end EF-2, with maximum winds around 115 mph.

Hail in BUREAU, ILLINOIS
From 04-APR-23 09:58:00 to 04-APR-23 09:58:00 (CST-6)
Location: NEW BEDFORD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CARROLL, ILLINOIS
From 04-APR-23 10:35:00 to 04-APR-23 10:35:00 (CST-6)
Location: MILLEDGEVILLE
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BUREAU, ILLINOIS
From 04-APR-23 10:38:00 to 04-APR-23 10:38:00 (CST-6)
Location: CHERRY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Tornado in ROCK ISLAND, ILLINOIS
From 04-APR-23 08:41:00 to 04-APR-23 08:43:00 (CST-6)
Location: BLACKHAWK STATE PARK
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief tornado occurred in the City of Rock Island, Illinois. The tornado was on the ground for 1.59 miles with a maximum width of 150 yards and a peak estimated winds of 95 MPH. The tornado knocked over and snapped large trees and produced minor damage to several roofs. Widespread damaging straight-line winds up to 90 mph also caused significant damage across the city.

Hail in WHITESIDE, ILLINOIS
From 04-APR-23 09:40:00 to 04-APR-23 09:40:00 (CST-6)
Location: MORRISON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BUREAU, ILLINOIS
From 04-APR-23 10:15:00 to 04-APR-23 10:15:00 (CST-6)
Location: KASBEER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A public report of hail ranging in size from pea to quarter.

Hail in BUREAU, ILLINOIS
From 04-APR-23 10:23:00 to 04-APR-23 10:23:00 (CST-6)
Location: MALDEN
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in BUREAU, ILLINOIS
From 04-APR-23 10:24:00 to 04-APR-23 10:24:00 (CST-6)
Location: MALDEN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in HENRY, ILLINOIS
From 04-APR-23 09:15:00 to 04-APR-23 09:19:00 (CST-6)
Location: GENESEO
Tornado F-scale: EF2
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A localized rear flank downdraft (RFD) surge on the south side of a broader high precipitation(HP)  supercell RFD caused a tornado to form. The EF2 tornado with 115 MPH winds began just east of Geneseo. The path had sporadic damage and based on eye-witness reports it was a multiple vortex tornado. Different suction vortices caused damage to farm buildings, trees, silos and houses along its 2.8 mile long path. Many trees were uprooted or snapped in different directions. Most houses had uplift of shingles. Towards the end of the path, the tornado strengthened just before it occluded. EF2 damage was found here as a power pole was snapped, 4 farm outbuildings were destroyed and the roof on the house was lifted then put back down on the house. Many thanks to Henry County OEM for helping with the survey.

Tornado in ROCK ISLAND, ILLINOIS
From 04-APR-23 08:47:00 to 04-APR-23 08:49:00 (CST-6)
Location: FRUITLAND
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief EF1 tornado caused damage to trees and roofs across its 1.6 mile long path. Eyewitness reports of the tornado and debris aided in the identification of this tornado.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 04-APR-23 08:53:00 to 04-APR-23 08:53:00 (CST-6)
Location: MOLINE
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported power poles down and sign damage at Applebees in Moline. Winds were estimated as over 80 MPH.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 04-APR-23 08:46:00 to 04-APR-23 08:46:00 (CST-6)
Location: (MLI) QUAD CITY ARPT
Magnitude: 78.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

ASOS at the Moline Quad Cities International Airport (KMLI) measured a peak wind gust of 78 knots.

Thunderstorm Wind in HENRY, ILLINOIS
From 04-APR-23 09:35:00 to 04-APR-23 09:35:00 (CST-6)
Location: HOOPPOLE
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A member of the general public reported a snapped tree.