A cold front pushing into a very moist and unstable airmass triggered numerous severe thunderstorms on May 30, 2013. Deep layer shear was moderate to strong and freezing levels were in the 11-12k foot level, which was ideal for large hail. The storms produced damaging winds, large hail and several weak tornadoes. An EF1 tornado touched down in Andalusia, IL around 445 pm CDT and traveled due north. This weak tornado crossed the Mississippi River and moved through eastern sections of Buffalo, IA. Wind speeds were estimated to be 95 mph. Some large trees were snapped and uprooted along the path. Some of the fallen trees fell onto houses. In extreme northeast Missouri, wind gusts estimated to be 70 mph produced heavy tree damage throughout Scotland County. Several outbuildings were damaged and about 30 power poles were snapped. The tree damage was mainly located between Bible Grove and Memphis.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 30-MAY-13 17:17:00 to 30-MAY-13 17:17:00 (CST-6)
Location: FREEPORT
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported some 6 to 8 inch tree limbs down in town.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 30-MAY-13 17:25:00 to 30-MAY-13 17:25:00 (CST-6)
Location: STERLING
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported trees and power lines blown down.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 30-MAY-13 17:30:00 to 30-MAY-13 17:30:00 (CST-6)
Location: WINNESHIEK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported a 1 foot diameter limb of a maple tree down near town.  An adjacent field had a section of oats flattened.

Thunderstorm Wind in ROCK ISLAND, ILLINOIS
From 30-MAY-13 15:55:00 to 30-MAY-13 15:55:00 (CST-6)
Location: CARBON CLIFF
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter measured 62 mph winds.

Thunderstorm Wind in STEPHENSON, ILLINOIS
From 30-MAY-13 17:17:00 to 30-MAY-13 17:17:00 (CST-6)
Location: FREEPORT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manager reported sustained winds of 50 to 60 mph for 10 minutes.

Hail in ROCK ISLAND, ILLINOIS
From 30-MAY-13 14:15:00 to 30-MAY-13 14:15:00 (CST-6)
Location: TAYLOR RIDGE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in WHITESIDE, ILLINOIS
From 30-MAY-13 16:35:00 to 30-MAY-13 16:36:00 (CST-6)
Location: PORTLAND CORNERS
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An EF0 tornado briefly touched down about 2 miles southwest of Prophetstown, IL around 535 pm CDT.  Wind speeds were estimated to be about 70 mph.  No damage was reported.

Thunderstorm Wind in HENDERSON, ILLINOIS
From 30-MAY-13 15:20:00 to 30-MAY-13 15:20:00 (CST-6)
Location: OQUAWKA
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

The emergency manage reported trees and power lines down around Henderson county. The city of Oquawka particularly sustained significant damage.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 30-MAY-13 15:34:00 to 30-MAY-13 15:34:00 (CST-6)
Location: AUGUSTA
Magnitude: 53.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a roof blown off of a metal building in town and poles down in Augusta.

Thunderstorm Wind in MERCER, ILLINOIS
From 30-MAY-13 15:45:00 to 30-MAY-13 15:45:00 (CST-6)
Location: SUNBEAM
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported large trees down with winds estimated at 70 mph.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 30-MAY-13 16:40:00 to 30-MAY-13 16:40:00 (CST-6)
Location: UNIONVILLE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter measured a large 8 inch tree limb down.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 30-MAY-13 16:50:00 to 30-MAY-13 16:50:00 (CST-6)
Location: DEER GROVE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a large tree blown partially over.

Thunderstorm Wind in JO DAVIESS, ILLINOIS
From 30-MAY-13 16:55:00 to 30-MAY-13 16:55:00 (CST-6)
Location: GALENA
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A large 22 inch diameter tree was snapped a foot off the ground.

Thunderstorm Wind in WHITESIDE, ILLINOIS
From 30-MAY-13 17:14:00 to 30-MAY-13 17:14:00 (CST-6)
Location: STERLING
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A large tree was down on power lines near town.

Tornado in ROCK ISLAND, ILLINOIS
From 30-MAY-13 15:44:00 to 30-MAY-13 15:45:00 (CST-6)
Location: ANDALUSIA
Tornado F-scale: EF0
Property damage: 40.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An EF1 tornado touched down in Andalusia, IL around 445 pm CDT and traveled north-northeast.  This weak tornado crossed the Mississippi River into Scott County and moved through eastern sections of Buffalo, IA.  Wind speeds were estimated to be 95 mph.  Some large trees were snapped and uprooted along the path.  Some of the fallen trees fell onto houses.