A strong and quick moving cold front made its way through the Midwest. The environment ahead of the cold front was unseasonably warm, with temperatures in the upper 60s and readings in the 40s not far behind the front. This led to strong baroclinicity along the front, and subsequent convection with just the right amount of instability. This is considered a high shear low CAPE (HSLC) event, where organized severe thunderstorms are favored in this environment. Potential hazards are damaging winds, large hail, and tornadoes. Six tornadoes were confirmed and several wind reports were received (ranging between 50-60 mph, with a few gusts over 60 mph). Damage reports ranged from structural damage to tree damage. Many residents were left without power in parts of northwestern IL, leading to some schools canceling classes on the 11th. Besides the strong winds, a few severe hail reports were received.
In addition, heavy rain occurred with some of the stronger storms, with rainfall totals over an inch. For how dry it has been, flash flooding was not much of a concern. While the environment was very moist and favorable for heavy rainfall, the fast storm motions led to little accumulation through much of our forecast area.

Tornado in WHITESIDE, ILLINOIS
From 10-NOV-20 15:00:00 to 10-NOV-20 15:07:00 (CST-6)
Location: MORRISON-ROCKWOOD SP
Tornado F-scale: EF1
Reported by: NWS Storm Survey

Brief EF1 tornado, with peak winds 100 mph, a path length of 4.3 miles, and a max path width of 100 yards. This tornado touched down northeast of Morrison, damaging the roof of a barn and downing tree limbs. Further along the path, an outbuilding was destroyed and a few soft pine trees were snapped.

Tornado in WHITESIDE, ILLINOIS
From 10-NOV-20 14:38:00 to 10-NOV-20 14:39:00 (CST-6)
Location: ALBANY
Tornado F-scale: EF1
Reported by: NWS Storm Survey

This was rated an EF1 tornado, with max winds at 90 mph, a path length of 0.3 miles, and a path width of 100 yards. A roof was blown off of a barn and into an adjacent field.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 10-NOV-20 13:15:00 to 10-NOV-20 13:15:00 (CST-6)
Location: WARSAW
Magnitude: 52.00 EG
Reported by: Law Enforcement

Reports of tree limbs and power lines down throughout the county. Time estimated using radar.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 10-NOV-20 13:30:00 to 10-NOV-20 13:30:00 (CST-6)
Location: DENVER
Magnitude: 70.00 EG
Reported by: Public

Sheets of metal peeled off an outbuilding.

Tornado in MERCER, ILLINOIS
From 10-NOV-20 14:02:00 to 10-NOV-20 14:03:00 (CST-6)
Location: BURGESS
Tornado F-scale: EF1
Reported by: NWS Storm Survey

Brief tornado touchdown with 100 mph peak winds and a 30 yard path width. This tornado destroyed a large grain bin about 1.4 miles west of Burgess, IL.

Tornado in MERCER, ILLINOIS
From 10-NOV-20 13:45:00 to 10-NOV-20 14:03:00 (CST-6)
Location: JOY
Tornado F-scale: EF1
Reported by: NWS Storm Survey

A tornado touched down southwest of Joy, destroying an outbuilding. This tornado followed an intermittent path about 14 miles through Mercer County, exiting the county about 3 miles west of Reynolds. The tornado was rated EF-1 in Mercer County, with maximum winds around 100 mph. Occasional tree damage was observed between Joy and Hamlet.

Tornado in ROCK ISLAND, ILLINOIS
From 10-NOV-20 14:03:00 to 10-NOV-20 14:07:00 (CST-6)
Location: REYNOLDS
Tornado F-scale: EF1
Reported by: NWS Storm Survey

This tornado developed southwest of Joy in Mercer County, and entered Rock Island County about 3 miles west of Reynolds. The path in Rock Island County was a little over 6 miles and the tornado lifted near Taylor Ridge. The tornado was rated EF-1 in both Mercer and Rock Island Counties, with maximum winds around 100 mph. The tornado caused tree damage just south of Taylor Ridge.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 10-NOV-20 14:14:00 to 10-NOV-20 14:14:00 (CST-6)
Location: (MLI) QUAD CITY ARPT
Magnitude: 56.00 MG
Reported by: ASOS

Direct ASOS measurement of thunderstorm wind gust.

Thunderstorm Wind in HENRY, ILLINOIS
From 10-NOV-20 14:35:00 to 10-NOV-20 14:35:00 (CST-6)
Location: GENESEO
Magnitude: 52.00 EG
Reported by: Broadcast Media

Thunderstorm wind gust estimated at around 60 mph.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 10-NOV-20 15:00:00 to 10-NOV-20 15:00:00 (CST-6)
Location: YEOWARD ADDITION
Magnitude: 51.00 MG
Reported by: AWOS

Direct thunderstorm wind gust measurnment from the Sterling AWOS.

Thunderstorm Wind in HENDERSON, ILLINOIS
From 10-NOV-20 13:50:00 to 10-NOV-20 14:00:00 (CST-6)
Location: GLADSTONE
Magnitude: 52.00 EG
Reported by: Trained Spotter

Estimated 60 mph winds with extremely heavy rain, leading to loss of power.

Thunderstorm Wind in MERCER, ILLINOIS
From 10-NOV-20 13:50:00 to 10-NOV-20 13:50:00 (CST-6)
Location: JOY
Magnitude: 78.00 EG
Reported by: Law Enforcement

Power poles snapped off along highway 17, east of Joy. Large trees with limbs torn off, along with fences blown down in the town of Joy.  Also, reports of buildings destroyed south of Joy. Time of the event was estimated by radar.

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 10-NOV-20 14:17:00 to 10-NOV-20 14:17:00 (CST-6)
Location: BUSHNELL
Magnitude: 70.00 EG
Reported by: Public

Metal outbuilding blown across field.

Thunderstorm Wind in HENRY, ILLINOIS
From 10-NOV-20 14:21:00 to 10-NOV-20 14:21:00 (CST-6)
Location: OPHEIM
Magnitude: 61.00 EG
Reported by: Public

Tree branches down, lost shingles, and a grain bin was destroyed.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 10-NOV-20 14:43:00 to 10-NOV-20 14:43:00 (CST-6)
Location: MORRISON
Magnitude: 56.00 EG
Reported by: Trained Spotter

Tree branch blown down on a roof, with possible funnel cloud spotted.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 10-NOV-20 14:47:00 to 10-NOV-20 14:47:00 (CST-6)
Location: MORRISON
Magnitude: 70.00 EG
Reported by: Trained Spotter

Multiple power poles down on the east side of town.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 10-NOV-20 14:49:00 to 10-NOV-20 14:49:00 (CST-6)
Location: MORRISON
Magnitude: 78.00 EG
Reported by: Trained Spotter

Ten to twelve power poles snapped on Hazel Road, west of Lyndon Road. This is a general location and the time is estimated from radar.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 10-NOV-20 14:50:00 to 10-NOV-20 14:50:00 (CST-6)
Location: MORRISON
Magnitude: 80.00 EG
Reported by: Trained Spotter

Barn destroyed and blown into a field. The damage occurred on Lyndon Road, north of Hazel Road. This is the general location, with time estimated by radar.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 10-NOV-20 14:54:00 to 10-NOV-20 14:54:00 (CST-6)
Location: AGNEW
Magnitude: 70.00 EG
Reported by: Public

Heavy damage to a hog outbuilding.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 10-NOV-20 14:58:00 to 10-NOV-20 14:58:00 (CST-6)
Location: COLETA
Magnitude: 70.00 EG
Reported by: Trained Spotter

Report along Capp Road. Cattle shed with a roof blown off, shingles were blown off of a house, along with a healthy tree snapped. Time of the event was estimated using radar.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 10-NOV-20 15:27:00 to 10-NOV-20 15:27:00 (CST-6)
Location: GERMAN VLY
Magnitude: 56.00 EG
Reported by: Emergency Manager

Tree limbs and power lines down.

Tornado in HENRY, ILLINOIS
From 10-NOV-20 14:42:00 to 10-NOV-20 14:43:00 (CST-6)
Location: ATKINSON
Tornado F-scale: EF1
Reported by: NWS Storm Survey

Brief tornado touchdown southwest of Atkinson, IL. Rated EF1 with peak winds at 100 mph, a path length of 0.3 miles, and a path width 30 yards. The roof of a large outbuilding was significantly damaged and the debris was scattered over a quarter mile to the northeast.

Tornado in WHITESIDE, ILLINOIS
From 10-NOV-20 14:50:00 to 10-NOV-20 14:53:00 (CST-6)
Location: ROUND GROVE
Tornado F-scale: EF1
Reported by: NWS Storm Survey

Brief EF1 tornado touchdown with max winds at 100 mph, a path length of 3.5 miles, and a max path width 100 yards. This tornado touched down northeast of Lyndon, leading to sporadic tree damage, including a few snapped trees, and severe damage to the roof of a large hog building.