An organized complex of thunderstorms developed ahead of a cold front as it approached southern Illinois and southeast Missouri during the hottest and most unstable time of day. Very strong instability, coupled with moderately strong mid-level winds, resulted in a few damaging wind events with the initial complex that affected places east of a Dexter to Marble Hill line. In the wake of the initial complex, multi-cell clusters rapidly developed on the upshear side of the cold pool left by the first complex. These clusters produced several large hail events, along with isolated damaging wind.

Thunderstorm Wind in STODDARD, MISSOURI
From 04-AUG-09 16:50:00 to 04-AUG-09 16:50:00 (CST-6)
Location: ADVANCE
Magnitude: 56.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A tractor-trailer rig loaded with freight was blown over. A 16-inch diameter tree was blown down on a mobile home. An 8-inch diameter tree was blown down on a pickup truck. Numerous tree limbs were blown down, along with small trees. Shingles were blown off roofs.

Heavy Rain in CAPE GIRARDEAU, MISSOURI
From 04-AUG-09 16:40:00 to 04-AUG-09 16:58:00 (CST-6)
Location: CAPE GIRARDEAU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rainfall of 1.20 inches was measured in 15 minutes. Several street intersections had standing water.

Heavy Rain in SCOTT, MISSOURI
From 04-AUG-09 19:00:00 to 04-AUG-09 21:00:00 (CST-6)
Location: SCOTT CITY
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

A section of County Road 219 was impassable because of erosion from the rainfall.  The road reopened the following day. A section of the main street in Scott City was flooded and impassable for about an hour.

Lightning in BUTLER, MISSOURI
From 04-AUG-09 22:00:00 to 04-AUG-09 22:00:00 (CST-6)
Location: POPLAR BLUFF
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning hit an electrical substation, knocking out power to 1,100 customers in downtown Poplar Bluff.

Hail in RIPLEY, MISSOURI
From 04-AUG-09 22:28:00 to 04-AUG-09 22:28:00 (CST-6)
Location: DONIPHAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CARTER, MISSOURI
From 04-AUG-09 21:40:00 to 04-AUG-09 21:40:00 (CST-6)
Location: ELLSINORE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy Rain in MISSISSIPPI, MISSOURI
From 04-AUG-09 19:30:00 to 04-AUG-09 21:00:00 (CST-6)
Location: CHARLESTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water was over several roadways throughout the community.

Thunderstorm Wind in SCOTT, MISSOURI
From 04-AUG-09 18:50:00 to 04-AUG-09 18:50:00 (CST-6)
Location: SCOTT CITY
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Newspaper

A few trees were blown down, along with some tree limbs and power lines.

Flash Flood in CAPE GIRARDEAU, MISSOURI
From 04-AUG-09 18:50:00 to 04-AUG-09 21:30:00 (CST-6)
Location: CAPE GIRARDEAU
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The southern half of the city experienced serious flooding. County officials activated swift water rescue teams. Authorities assisted a handful of people whose vehicles were stranded in high water. Various degrees of flooding were reported throughout Cape Girardeau. Numerous main and secondary roads throughout the downtown area were covered with standing water. A section of a main street was closed in the city.

Thunderstorm Wind in CAPE GIRARDEAU, MISSOURI
From 04-AUG-09 16:50:00 to 04-AUG-09 16:50:00 (CST-6)
Location: CAPE GIRARDEAU
Magnitude: 52.00 EG
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees and power lines were blown down, blocking roads and damaging houses. A trained spotter estimated gusts around 60 mph. Power outages affected more than 5,000 customers in the county.

Hail in WAYNE, MISSOURI
From 04-AUG-09 19:52:00 to 04-AUG-09 20:05:00 (CST-6)
Location: GREENVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A multi-cell cluster of thunderstorms produced large hail over parts of central and eastern Wayne County. Golf-ball size hail was reported in Greenville. Quarter-size hail fell in Shook.

Hail in WAYNE, MISSOURI
From 04-AUG-09 20:58:00 to 04-AUG-09 20:58:00 (CST-6)
Location: LAKE WAPPAPELLO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The one-inch hail fell over Lake Wappapello State Park.

Thunderstorm Wind in BUTLER, MISSOURI
From 04-AUG-09 21:41:00 to 04-AUG-09 21:41:00 (CST-6)
Location: POPLAR BLUFF
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wind gust to 58 mph was measured by a spotter.