Event summary of 08/22/01Scattered strong thunderstorms developed during the evening hours of August 22 along an east-west boundary located from Northeast Missouri through West-central Illinois.  The combination of the front, moderately high CAPEs, vertical wind shear, and a vort-max moving through Eastern Iowa allowed severe thunderstorms to develop along the boundary.  Several small bow echo features moved along the front during the evening hours and produced wind damage and severe hail in Hancock and McDonough counties in Illinois.  Convergence along the boundary, along with persistent upward motion provided by the vort-max, allowed thunderstorms to train along the stationary boundary into the early morning hours of August 23.  Excessive rainfall fell during this period, and produced widespread urban and street flooding in West-central Illinois.  NWS Cooperative Observer rainfall observations recorded 6.30 to 8.00 inches in Hancock county from this event.

Thunderstorm Wind in HANCOCK, ILLINOIS
From 22-AUG-01 17:39:00 to 22-AUG-01 17:39:00 (CST)
Location: WARSAW
Magnitude: 52 E
Reported by: FIRE DEPT/RESCUE SQUAD

Fire dept reported 60 mph thunderstorm wind gust

Hail in HANCOCK, ILLINOIS
From 22-AUG-01 18:34:00 to 22-AUG-01 18:34:00 (CST)
Location: ELVASTON
Magnitude: 1.00 
Reported by: GENERAL PUBLIC

General public reported 1 inch hail

Hail in HANCOCK, ILLINOIS
From 22-AUG-01 17:15:00 to 22-AUG-01 17:15:00 (CST)
Location: CARTHAGE
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

A trained spotter reported 0.75 inch hail.

Hail in HANCOCK, ILLINOIS
From 22-AUG-01 17:37:00 to 22-AUG-01 17:37:00 (CST)
Location: PLYMOUTH
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

A trained spotter reported 0.75 inch hail.

Flood in HANCOCK, ILLINOIS
From 22-AUG-01 19:24:00 to 22-AUG-01 19:24:00 (CST)
Location: CARTHAGE
Reported by: LAW ENFORCEMENT

Law enforcement reported street flooding in Carthage and over Route 96, south of Hamilton and Route 94, north of Carthage

Thunderstorm Wind in HANCOCK, ILLINOIS
From 22-AUG-01 18:24:00 to 22-AUG-01 18:24:00 (CST)
Location: WARSAW
Magnitude: 60 E
Reported by: LAW ENFORCEMENT

Law enforcement reported power lines down

Heavy Rain in HANCOCK, ILLINOIS
From 23-AUG-01 06:00:00 to 23-AUG-01 06:00:00 (CST)
Location: AUGUSTA
Magnitude: 8 
Reported by: OFFICIAL NWS OBS.

NWS Cooperative observer reported 24 hr rainfall total of 8.00 inches

Flood in HANCOCK, ILLINOIS
From 22-AUG-01 22:15:00 to 22-AUG-01 22:15:00 (CST)
Location: AUGUSTA
Reported by: OFFICIAL NWS OBS.

NWS Cooperative observer reported 6.23 inches of rain since 18:00 CST. Street in Augusta covered by nearly a foot of water.

Heavy Rain in HANCOCK, ILLINOIS
From 23-AUG-01 06:00:00 to 23-AUG-01 06:00:00 (CST)
Location: CARTHAGE
Magnitude: 6.3 
Reported by: OFFICIAL NWS OBS.

NWS Cooperative observer reported 24hr rainfall total of 6.30 inches

Thunderstorm Wind in HANCOCK, ILLINOIS
From 22-AUG-01 17:43:00 to 22-AUG-01 17:43:00 (CST)
Location: NAUVOO
Magnitude: 60 E
Reported by: LAW ENFORCEMENT

Law enforcement reported power lines down

Thunderstorm Wind in MCDONOUGH, ILLINOIS
From 22-AUG-01 17:45:00 to 22-AUG-01 17:45:00 (CST)
Location: FANDON
Magnitude: 60 E
Reported by: TRAINED SPOTTER

A trained spotter reported numerous large trees down near Fandon

Flood in MCDONOUGH, ILLINOIS
From 23-AUG-01 00:30:00 to 23-AUG-01 00:30:00 (CST)
Location: MACOMB
Reported by: LAW ENFORCEMENT

Law enforcement reports water over roads in southern portion of McDonough county

Thunderstorm Wind in HANCOCK, ILLINOIS
From 22-AUG-01 19:00:00 to 22-AUG-01 19:00:00 (CST)
Location: WARSAW
Magnitude: 60 E
Reported by: LAW ENFORCEMENT

Law enforcement reported additional power lines down

Hail in HANCOCK, ILLINOIS
From 22-AUG-01 18:50:00 to 22-AUG-01 18:50:00 (CST)
Location: BENTLEY
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

A trained spotter reported 0.75 inch hail