A stalled frontal boundary along the I-70 corridor was the focus of training convection September 1st and into the early hours of September 2nd.  There were several reports of severe weather as well as flash flooding.

Flash Flood in BOONE, MISSOURI
From 01-SEP-14 20:14:00 to 02-SEP-14 07:00:00 (CST-6)
Location: HUNTSDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Up to six inches of rain fell in a short amount of time causing flash flooding.  Numerous roads were flooded including Sinclair Road south of Nifong Blvd. West, Highway WW at Old Hawthorne Road, and Highway ZZ.

Hail in ST. LOUIS, MISSOURI
From 01-SEP-14 21:50:00 to 01-SEP-14 21:54:00 (CST-6)
Location: BALLWIN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. LOUIS, MISSOURI
From 01-SEP-14 21:55:00 to 01-SEP-14 22:00:00 (CST-6)
Location: VLY PARK
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 01-SEP-14 21:55:00 to 01-SEP-14 21:55:00 (CST-6)
Location: VLY PARK
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm winds were estimated around 70 mph in Valley Park.

Flash Flood in CALLAWAY, MISSOURI
From 01-SEP-14 22:15:00 to 02-SEP-14 07:00:00 (CST-6)
Location: YOUNGERS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to six inches of rain fell in a short amount of time causing flash flooding.  Numerous roads had water over them including U.S. Highway 54 just south of Kingdom City.

Tornado in JEFFERSON, MISSOURI
From 01-SEP-14 21:43:00 to 01-SEP-14 21:55:00 (CST-6)
Location: HOENE SPG
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down on John McKeever Road just north of intersection with Autumn Leaf Drive. It caused tree damage in this area. The tornado traveled to the southeast, crossing Byrnesville Road then crossed the Big River about two miles west of Highway W. It caused considerable damage to a business on the north side of the intersection of State Highway 30 and Highway W.  A quarter of the roof was torn off and the deck was uplifted.  The air conditioning units were moved as well.  From here the tornado turned to the northeast, south and east of State Highway 30.  Sporadic tree damage was observed before the tornado lifted and dissipated on Elizabeth Drive just north of intersection with Victoria Drive.

Flash Flood in MONTGOMERY, MISSOURI
From 02-SEP-14 00:30:00 to 02-SEP-14 07:00:00 (CST-6)
Location: WELLSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to five inches of rain fell in a short amount of time causing flash flooding.  Numerous roads were flooded including part of Highway 19 in New Florence.

Flash Flood in LINCOLN, MISSOURI
From 02-SEP-14 05:00:00 to 02-SEP-14 06:30:00 (CST-6)
Location: SOUTH TROY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

Up to six inches of rain fell in a short amount of time causing flash flooding.  Highway J southwest of Troy was closed due to running water from Big Creek.