An unseasonably hot and humid airmass persisted across central Illinois on May 25th.  Numerous outflow boundaries left behind by convection from the day before served as focusing mechanisms for additional thunderstorms...mainly during the afternoon and evening.  Some of the storms produced small hail and locally heavy rainfall that led to flash flooding.  In addition...a tornado briefly touched down in northern Peoria County.

Hail in SANGAMON, ILLINOIS
From 25-MAY-10 10:57:00 to 25-MAY-10 10:58:00 (CST-6)
Location: SPRINGFIELD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in SANGAMON, ILLINOIS
From 25-MAY-10 10:30:00 to 25-MAY-10 14:30:00 (CST-6)
Location: LICK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Slow moving, single cell thunderstorms produced more than 2.00 inches of rain in one hour across part of southern Sangamon County. The heaviest rainfall was reported between the towns of Glenarm and Divernon where I-55 was closed for a period of time.

Flash Flood in WOODFORD, ILLINOIS
From 25-MAY-10 13:00:00 to 25-MAY-10 16:00:00 (CST-6)
Location: WASHBURN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Slow moving, single cell thunderstorms produced nearly 2.00 inches of rain in one hour in northeast Woodford County. Most rural roads were inundated, particularly near Minonk and north of Benson, including Illinois Route 117.

Flash Flood in MARSHALL, ILLINOIS
From 25-MAY-10 13:00:00 to 25-MAY-10 16:00:00 (CST-6)
Location: LA ROSE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Slow moving, single cell thunderstorms produced nearly 2.00 inches of rain in one hour across a small part of southeast Marshall County. Most rural roads were inundated, as was Illinois Route 117 south of Toluca to the Woodford County line.

Flash Flood in TAZEWELL, ILLINOIS
From 25-MAY-10 13:00:00 to 25-MAY-10 18:00:00 (CST-6)
Location: CREVE COEUR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Slow moving, single cell thunderstorms produced nearly 3.50 inches of rain in two hours across western Tazewell County. Many area roads were closed and vehicles stranded due to flowing water of 6 to 12 inches deep. The hardest hit area was along Springfield Road from the intersection of Muller Road to near Delavan. Most streets in the village of Tremont were also flooded.

Flash Flood in STARK, ILLINOIS
From 25-MAY-10 14:00:00 to 25-MAY-10 18:00:00 (CST-6)
Location: WEST JERSEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A slow moving single cell thunderstorm, which also spawned a brief landspout tornado northwest of Princeville, produced nearly 3.00 inches of rain in one hour across a small part of southern Stark County. Most rural roads were inundated from the heavy rain. Illinois Route 91 west of the town of Stark was closed due to the flooding.

Tornado in PEORIA, ILLINOIS
From 25-MAY-10 13:10:00 to 25-MAY-10 13:14:00 (CST-6)
Location: LAURA
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A landspout tornado developed, as a gustnado on an outflow boundary spun-up and connected with a convergence line funnel, in a field northwest of Princeville. The landspout tracked slowly to the west-northwest for 4 minutes before dissipating.  No damage was reported.

Flash Flood in PEORIA, ILLINOIS
From 25-MAY-10 14:00:00 to 25-MAY-10 18:00:00 (CST-6)
Location: ELMORE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A slow moving single cell thunderstorm, which also spawned a brief landspout tornado northwest of Princeville, produced nearly 3.00 inches of rain in one hour across a small part of northwest Peoria County. Most rural roads were inundated from the heavy rain. Illinois Route 91 north of Princeville, and Illinois Route 90 between Princeville and Laura were closed due to the flooding.