A stationary front that extended along the Missouri/Iowa border then into north central Illinois helped to trigger several rounds of showers and thunderstorms.  Some of the storms became severe.

Hail in LEWIS, MISSOURI
From 21-JUL-08 18:35:00 to 21-JUL-08 18:35:00 (CST-6)
Location: TOLONA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in CALLAWAY, MISSOURI
From 22-JUL-08 08:30:00 to 22-JUL-08 08:30:00 (CST-6)
Location: NEW BLOOMFIELD
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds caused minor damage to an outbuilding including a few broken windows.  Also, numerous large tree limbs were blown down.

Flash Flood in BOONE, MISSOURI
From 22-JUL-08 06:30:00 to 22-JUL-08 10:15:00 (CST-6)
Location: MIDWAY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Between 3 and 5 inches of rain fell in a short amount of time causing some roads to be flooded, including Route ZZ on the west side of Columbia, between I-70 and Route TT.

Hail in LEWIS, MISSOURI
From 21-JUL-08 19:50:00 to 21-JUL-08 19:50:00 (CST-6)
Location: MAYWOOD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in LEWIS, MISSOURI
From 21-JUL-08 19:52:00 to 22-JUL-08 01:30:00 (CST-6)
Location: EWING
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Between 2 and 4 inches of rain fell in a short amount of time on already saturated soils.  This caused flash flooding.  Several secondary roads were flooded including Highway C, west of La Grange.  Eight to twelve inches of water was flowing over Highway C.

Thunderstorm Wind in MARION, MISSOURI
From 21-JUL-08 20:17:00 to 21-JUL-08 20:20:00 (CST-6)
Location: PALMYRA
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds blew down several power lines as well as numerous tree limbs.

Thunderstorm Wind in RALLS, MISSOURI
From 21-JUL-08 20:28:00 to 21-JUL-08 20:28:00 (CST-6)
Location: FLINTHILL
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew 2 semis off of U.S. Highway 61, 3 miles south of Hannibal.

Thunderstorm Wind in PIKE, MISSOURI
From 21-JUL-08 21:05:00 to 21-JUL-08 21:05:00 (CST-6)
Location: LOUISIANA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down a couple of power lines and trees onto Highway 79 on the north side of Louisiana.

Thunderstorm Wind in ST. CHARLES, MISSOURI
From 21-JUL-08 22:50:00 to 21-JUL-08 22:50:00 (CST-6)
Location: ST PETERS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous large tree limbs were blown down.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 21-JUL-08 23:00:00 to 21-JUL-08 23:00:00 (CST-6)
Location: FLORISSANT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous large tree limbs and several power lines were blown down.

Hail in BOONE, MISSOURI
From 22-JUL-08 08:20:00 to 22-JUL-08 08:20:00 (CST-6)
Location: ASHLAND
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter