A line of severe storms moved through the region.  There were numerous reports of large hail and damaging winds, as well as a couple of tornadoes and flash flooding.

Hail in OSAGE, MISSOURI
From 20-MAY-13 16:52:00 to 20-MAY-13 16:52:00 (CST-6)
Location: BYRON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONROE, MISSOURI
From 20-MAY-13 17:08:00 to 20-MAY-13 17:18:00 (CST-6)
Location: MADISON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in BOONE, MISSOURI
From 20-MAY-13 17:22:00 to 20-MAY-13 17:34:00 (CST-6)
Location: COLUMBIA
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail fell in a swath from the northeast side of Columbia to Murry.  Some of the large hail caused minor damage to a few vehicles.

Hail in BOONE, MISSOURI
From 20-MAY-13 17:39:00 to 20-MAY-13 17:39:00 (CST-6)
Location: CENTRALIA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in AUDRAIN, MISSOURI
From 20-MAY-13 17:40:00 to 20-MAY-13 17:40:00 (CST-6)
Location: THOMPSON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm Wind in MONROE, MISSOURI
From 20-MAY-13 17:53:00 to 20-MAY-13 17:53:00 (CST-6)
Location: FLORIDA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Several large tree limbs were blown down.

Hail in FRANKLIN, MISSOURI
From 20-MAY-13 18:24:00 to 20-MAY-13 18:24:00 (CST-6)
Location: UNION
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in MARION, MISSOURI
From 20-MAY-13 18:24:00 to 20-MAY-13 18:26:00 (CST-6)
Location: WHITE BEAR
Tornado F-scale: EF1
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado touched down west southwest of Hannibal, damaging several trees and a structure about a mile south of the Hannibal Regional Medical Center, just northeast of the intersection of Centerville Road and County Road 420. The tornado then moved northeast and caused its most intense damage, low end EF-1, at the intersection of Centerville Road and Shinn Lane.  In this area several large trees were either uprooted or snapped off halfway up the trunk.  The tornado moved northeast to Highway MM where it tore about a quarter of the tin roof off of a farm building and damaged some trees.  The tornado dissipated as it crossed Highway MM.

Thunderstorm Wind in MARION, MISSOURI
From 20-MAY-13 18:26:00 to 20-MAY-13 18:30:00 (CST-6)
Location: HANNIBAL MUNI ARPT
Magnitude: 87.00 EG
Crop damage: 0.00K
Reported by: NWS Storm Survey

A line of severe thunderstorms moved through Hannibal.  The storms caused considerable wind damage in and around Hannibal.  The damage area was roughly from Highway MM north to Hannibal-LaGrange University.  One building at the university had a small portion of its roof torn off.  Numerous trees were either uprooted or snapped along Palmyra Road/Mark Twain Avenue.  A three story brick building in downtown Hannibal on Main Street had a wall collapse and about half its roof torn off.  Wind gusts in this area were likely around 100 mph.  Tree damage was common west of the downtown area to U.S. Highway 61 and then west of U.S. Highway 61 along West Ely Road.  The subdivisions around Pioneer Lake and Apollo Lake had numerous large tree branches blown down.  One home near Apollo Lake had windows broken by flying debris.  A small building lost part of its roof on the south side of Hannibal on Market Street.

Thunderstorm Wind in RALLS, MISSOURI
From 20-MAY-13 18:08:00 to 20-MAY-13 18:10:00 (CST-6)
Location: HASSARD
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Thunderstorm winds blew down numerous large tree limbs along Highway J and Highway A.

Thunderstorm Wind in ST. CHARLES, MISSOURI
From 20-MAY-13 18:35:00 to 20-MAY-13 18:35:00 (CST-6)
Location: LAKE ST LOUIS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down several power lines at the intersection of Bryan Road and Mexico Road.

Thunderstorm Wind in ST. CHARLES, MISSOURI
From 20-MAY-13 20:42:00 to 20-MAY-13 20:42:00 (CST-6)
Location: ORCHARD FARM
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 20-MAY-13 20:55:00 to 20-MAY-13 20:55:00 (CST-6)
Location: KEYES SUMMIT
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds snapped a couple of large trees in Winchester.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 20-MAY-13 21:12:00 to 20-MAY-13 21:12:00 (CST-6)
Location: OLIVETTE
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Flash Flood in LINCOLN, MISSOURI
From 20-MAY-13 20:35:00 to 21-MAY-13 02:00:00 (CST-6)
Location: CHAIN OF ROCKS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Up to three inches of rain fell in a short amount of time causing flash flooding.  At the intersection of Highway C and Green Acres Drive, over a foot of water covered the road, so the road was closed for awhile.

Thunderstorm Wind in MONITEAU, MISSOURI
From 20-MAY-13 19:05:00 to 20-MAY-13 19:05:00 (CST-6)
Location: CALIFORNIA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down a few large trees.

Hail in ST. CHARLES, MISSOURI
From 20-MAY-13 19:17:00 to 20-MAY-13 19:20:00 (CST-6)
Location: HARVESTER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

There were several reports of one inch hail in St. Peters, Harvester and St. Charles.

Thunderstorm Wind in IRON, MISSOURI
From 20-MAY-13 21:39:00 to 20-MAY-13 21:39:00 (CST-6)
Location: VIBURNUM
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds blew down a 10 inch diameter tree across Highway 49, just northwest of Viburnum.

Thunderstorm Wind in ST. FRANCOIS, MISSOURI
From 20-MAY-13 21:50:00 to 20-MAY-13 22:00:00 (CST-6)
Location: BONNE TERRE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down numerous large tree limbs as well as several power lines in Bonne Terre and Park Hills.

Thunderstorm Wind in ST. FRANCOIS, MISSOURI
From 20-MAY-13 22:10:00 to 20-MAY-13 22:10:00 (CST-6)
Location: FARMINGTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down several power lines around town.

Thunderstorm Wind in IRON, MISSOURI
From 20-MAY-13 22:26:00 to 20-MAY-13 22:26:00 (CST-6)
Location: IRONTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down a two foot diameter tree.  The tree then knocked down a nearby power line.

Flash Flood in ST. CHARLES, MISSOURI
From 20-MAY-13 21:00:00 to 21-MAY-13 02:00:00 (CST-6)
Location: ALL SAINTS VLG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Up to 5 inches of rain fell in a short amount of time causing flash flooding.  Several roads were flooded including Highway N about a mile east of intersection with Highway K.  Highway 94 had over 10 inches of water over it near intersection with First Capitol Drive.  Several cars became stuck in the water at the intersection.

Thunderstorm Wind in WASHINGTON, MISSOURI
From 20-MAY-13 21:40:00 to 20-MAY-13 21:40:00 (CST-6)
Location: SPRINGTOWN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Thunderstorm winds blew down several large tree limbs just south of Potosi.

Thunderstorm Wind in ST. CHARLES, MISSOURI
From 20-MAY-13 19:12:00 to 20-MAY-13 19:12:00 (CST-6)
Location: COTTLEVILLE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down a large tree.