Very hot and humid air in place across eastern Iowa, northwest Illinois, and far northeast Missouri interacted with a southward moving frontal boundary and disturbance aloft, setting the stage for development and organization of severe thunderstorms across the region. Storms initially formed from north central Iowa and southern Wisconsin along the frontal boundary, which slowly worked south into the hot, humid air in place across the region. As storms arrived across east central Iowa, they began producing winds around 70 MPH across the Hwy 20 corridor. Another storm to the south further intensified, and began producing winds of 80+ MPH as it tracked along the Hwy 30 corridor. This impacted the northern suburbs of Cedar Rapids into Clinton. These storms continued to produce wind gusts around 60-70 MPH as they progressed into northwest Illinois. One brief EF-0 tornado began in Clinton, Iowa, then moved across the Mississippi River before dissipating near Fulton, Illinois. Damage near Andrew, Iowa in Jackson County was determined to be straight-line winds. Storms additionally produced large hail around the Dubuque metro, with quarter size hail reported.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 28-JUL-23 19:38:00 to 28-JUL-23 19:50:00 (CST-6)
Location: MC CONNELL
Magnitude: 70.00 EG
Reported by: Trained Spotter

Large tree blown down on a boat, with an 80 mph estimated gust 10 minutes prior at the AWOS.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 28-JUL-23 19:45:00 to 28-JUL-23 20:00:00 (CST-6)
Location: BUENA VISTA
Magnitude: 61.00 EG
Reported by: Public

Report from mping of trees being uprooted or snapped.

Thunderstorm Wind in HENRY, ILLINOIS
From 28-JUL-23 20:40:00 to 28-JUL-23 20:50:00 (CST-6)
Location: ATKINSON
Magnitude: 52.00 EG
Reported by: Emergency Manager

Multiple power lines and tree branches blown down between Geneseo and Annawan.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 28-JUL-23 19:50:00 to 28-JUL-23 20:00:00 (CST-6)
Location: FREEPORT
Magnitude: 52.00 EG
Reported by: Trained Spotter

Several 5 inch or larger tree branches downed by thunderstorm winds.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 28-JUL-23 20:15:00 to 28-JUL-23 20:25:00 (CST-6)
Location: OAK GROVE
Magnitude: 52.00 EG
Reported by: Trained Spotter

Tree blown down by thunderstorm winds.

Thunderstorm Wind in JO DAVIESS, ILLINOIS
From 28-JUL-23 19:30:00 to 28-JUL-23 20:00:00 (CST-6)
Location: GALENA
Magnitude: 61.00 EG
Reported by: Public

Rounds of severe storms resulted in several trees down within the county, with trees down over wires in Galena.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 28-JUL-23 20:15:00 to 28-JUL-23 20:30:00 (CST-6)
Location: FULTON
Magnitude: 61.00 EG
Reported by: Law Enforcement

Scattered trees blown down by thunderstorm winds.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 28-JUL-23 20:25:00 to 28-JUL-23 20:35:00 (CST-6)
Location: GARDEN PLAIN
Magnitude: 56.00 EG
Reported by: Trained Spotter

Thunderstorm winds blown a 8 to 12 inch diameter tree limb down on neighbor���s property.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 28-JUL-23 19:25:00 to 28-JUL-23 19:40:00 (CST-6)
Location: MC CONNELL
Magnitude: 70.00 EG
Reported by: Trained Spotter

Trained spotter estimated an 80 mph wind gust from the thunderstorms.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 28-JUL-23 19:50:00 to 28-JUL-23 20:00:00 (CST-6)
Location: FREEPORT
Magnitude: 52.00 EG
Reported by: Trained Spotter

Trained spotter estimated 60 mph wind gusts with the thunderstorm.

Thunderstorm Wind in HENRY, ILLINOIS
From 28-JUL-23 20:20:00 to 28-JUL-23 20:40:00 (CST-6)
Location: COLONA
Magnitude: 52.00 EG
Reported by: Trained Spotter

Trained spotter estimated a 60 mph wind gust from the thunderstorm.

Thunderstorm Wind in BUREAU, ILLINOIS
From 28-JUL-23 21:00:00 to 28-JUL-23 21:10:00 (CST-6)
Location: WALNUT
Magnitude: 52.00 EG
Reported by: Law Enforcement

Large tree limbs blown down by thunderstorm winds.

Thunderstorm Wind in BUREAU, ILLINOIS
From 28-JUL-23 21:15:00 to 28-JUL-23 21:30:00 (CST-6)
Location: CHERRY
Magnitude: 52.00 EG
Reported by: Public

Trees and large branches blown down by thunderstorm winds.

Thunderstorm Wind in BUREAU, ILLINOIS
From 28-JUL-23 21:14:00 to 28-JUL-23 21:30:00 (CST-6)
Location: LA MOILLE
Magnitude: 52.00 EG
Reported by: NWS Employee

An 18 inch diameter tree was blown down along US Highway 34.

Thunderstorm Wind in PUTNAM, ILLINOIS
From 28-JUL-23 21:20:00 to 28-JUL-23 21:40:00 (CST-6)
Location: HENNEPIN
Magnitude: 52.00 EG
Reported by: Public

Eight inch diameter tree snapped near the sheriff's office, with branches downed around town.

Thunderstorm Wind in BUREAU, ILLINOIS
From 28-JUL-23 21:18:00 to 28-JUL-23 21:30:00 (CST-6)
Location: DEPUE
Magnitude: 52.00 EG
Reported by: Public

Trees and several large branches downed by thunderstorm winds.

Thunderstorm Wind in BUREAU, ILLINOIS
From 28-JUL-23 21:22:00 to 28-JUL-23 21:35:00 (CST-6)
Location: SPRING VLY
Magnitude: 52.00 EG
Reported by: Public

Trees and powerlines blown down by thunderstorm winds.

Tornado in WHITESIDE, ILLINOIS
From 28-JUL-23 20:18:00 to 28-JUL-23 20:19:00 (CST-6)
Location: EAST CLINTON
Tornado F-scale: EF0
Reported by: NWS Storm Survey

A brief tornado developed in Clinton, IA Friday evening, and moved into Whiteside County Illinois over the Mississippi River, before dissipating near Fulton, IL. The tornado caused sporadic tree damage, including several large trees on the Clinton County courthouse lawn. The tornado was captured on webcam video at the riverfront, where it moved a boat docked near the Candlelight Inn in Clinton. Maximum winds were estimated around 75 mph. The tornado was rated EF0.