An unseasonably hot and humid airmass was in place across central Illinois on May 24th with afternoon high temperatures reaching the lower 90s.  A weak upper-level disturbance interacted with the unstable environment to produce scattered thunderstorms during the evening.  A few of the storms produced hail and gusty winds. The storms were very slow moving, so copious amounts of rainfall produced flash flooding in a few spots.

Flash Flood in MENARD, ILLINOIS
From 24-MAY-10 20:00:00 to 25-MAY-10 02:00:00 (CST-6)
Location: HUBLEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Slow moving, training thunderstorm cells produced an area of flash flooding in eastern Menard County. Rainfall rates of nearly 1.50 inches per hour for more than 3 hours were reported. Rainfall totals of nearly 5.00 inches were reported near the Logan County line. Many rural roads were inundated by the flooding.

Flash Flood in LOGAN, ILLINOIS
From 24-MAY-10 20:00:00 to 25-MAY-10 02:00:00 (CST-6)
Location: MIDDLETOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Slow moving, training thunderstorm cells produced an area of flash flooding in western Logan County. Rainfall rates of 1.50 inches per hour were reported for about three hours. Many rural roads were inundated by the flooding, particularly near Middletown.

Hail in LOGAN, ILLINOIS
From 24-MAY-10 17:50:00 to 24-MAY-10 17:51:00 (CST-6)
Location: BEASON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in SANGAMON, ILLINOIS
From 24-MAY-10 18:35:00 to 24-MAY-10 18:42:00 (CST-6)
Location: SPRINGFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in PIATT, ILLINOIS
From 24-MAY-10 19:00:00 to 24-MAY-10 19:01:00 (CST-6)
Location: MONTICELLO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in TAZEWELL, ILLINOIS
From 24-MAY-10 19:30:00 to 24-MAY-10 19:31:00 (CST-6)
Location: PEKIN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in TAZEWELL, ILLINOIS
From 24-MAY-10 19:41:00 to 24-MAY-10 19:42:00 (CST-6)
Location: PEKIN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in DE WITT, ILLINOIS
From 24-MAY-10 20:00:00 to 24-MAY-10 20:05:00 (CST-6)
Location: LANE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Hail in TAZEWELL, ILLINOIS
From 24-MAY-10 21:20:00 to 24-MAY-10 21:21:00 (CST-6)
Location: MORTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MCLEAN, ILLINOIS
From 24-MAY-10 22:49:00 to 24-MAY-10 22:50:00 (CST-6)
Location: BLOOMINGTON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Thunderstorm Wind in SANGAMON, ILLINOIS
From 24-MAY-10 18:30:00 to 24-MAY-10 18:30:00 (CST-6)
Location: CHATHAM
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Newspaper

A large cottonwood tree was blown down onto power lines, resulting in a four hour power outage.

Thunderstorm Wind in SANGAMON, ILLINOIS
From 24-MAY-10 18:40:00 to 24-MAY-10 18:40:00 (CST-6)
Location: DIVERNON
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

Several trees were knocked down onto powerlines, resulting in a brief power outage in parts of Divernon.

Thunderstorm Wind in MARSHALL, ILLINOIS
From 24-MAY-10 23:00:00 to 24-MAY-10 23:01:00 (CST-6)
Location: VARNA
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees and power lines were blown down near Route 17 and Route 89.