An area of low pressure moved east along Interstate 70 corridor with a warm front extending eastward across southern Illinois and a cold front trailing southwestward along I-44.  Storms developed over central Missouri and tracked east into southern Illinois mainly along I-70 with numerous reports of large hail between 2 and 3 inches in diameter, as well as a few reports of wind damage.  Some storms continued to produce hail into the early morning hours of April 29th before diminishing.  Overall there were over 150,000 hail damage claims made in Missouri for a total of $995 million in damages.

Hail in BOONE, MISSOURI
From 29-APR-12 01:25:00 to 29-APR-12 01:25:00 (CST-6)
Location: HALLSVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in BOONE, MISSOURI
From 29-APR-12 01:35:00 to 29-APR-12 01:35:00 (CST-6)
Location: CENTRALIA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in ST. CHARLES, MISSOURI
From 28-APR-12 16:57:00 to 28-APR-12 16:57:00 (CST-6)
Location: HARVESTER
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CALLAWAY, MISSOURI
From 28-APR-12 12:18:00 to 28-APR-12 12:18:00 (CST-6)
Location: FULTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MONTGOMERY, MISSOURI
From 28-APR-12 12:40:00 to 28-APR-12 12:40:00 (CST-6)
Location: MIDDLETOWN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in LINCOLN, MISSOURI
From 28-APR-12 13:30:00 to 28-APR-12 13:30:00 (CST-6)
Location: SOUTH TROY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. LOUIS, MISSOURI
From 28-APR-12 16:58:00 to 28-APR-12 17:05:00 (CST-6)
Location: TEMPO
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wide swath of large hail fell in an area from the Missouri River near Highway 364 eastward through the WestPort Plaza area to near Lindbergh Boulevard.  Numerous cars had their windows broken out at WestPort Plaza.  Also, numerous homes sustained roof and siding damage.

Hail in ST. LOUIS, MISSOURI
From 28-APR-12 17:00:00 to 28-APR-12 17:06:00 (CST-6)
Location: BRIDGETON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were numerous reports of one inch to one and a quarter inch hail in Bridgeton.

Hail in ST. LOUIS, MISSOURI
From 28-APR-12 17:04:00 to 28-APR-12 17:10:00 (CST-6)
Location: OVERLAND
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

There were numerous reports of golfball sized hail in Overland, with a couple reports of hail to tennis ball size.

Hail in ST. LOUIS, MISSOURI
From 28-APR-12 17:07:00 to 28-APR-12 17:08:00 (CST-6)
Location: BRECKENRIDGE HILLS
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were numerous reports of golfball sized hail across St. Ann.

Hail in ST. LOUIS, MISSOURI
From 28-APR-12 17:08:00 to 28-APR-12 17:09:00 (CST-6)
Location: OLIVETTE
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

There were numerous reports of large hail in Olivette, with some of the stones as large as baseballs.

Hail in JEFFERSON, MISSOURI
From 28-APR-12 17:05:00 to 28-APR-12 17:11:00 (CST-6)
Location: DE SOTO
Magnitude: 2.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large hail fell across De Soto with the biggest stones being tennis ball size.

Hail in ST. LOUIS, MISSOURI
From 28-APR-12 17:08:00 to 28-APR-12 17:14:00 (CST-6)
Location: CHARLACK
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

There were numerous reports of large hail across St. John.  The largest hail stones were baseball size near the intersection of St. Charles Rock Road and I-170.

Hail in ST. CHARLES, MISSOURI
From 28-APR-12 13:38:00 to 28-APR-12 13:38:00 (CST-6)
Location: FLINT HILL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. CHARLES, MISSOURI
From 28-APR-12 13:40:00 to 28-APR-12 13:40:00 (CST-6)
Location: WENTZVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in ST. CHARLES, MISSOURI
From 28-APR-12 14:10:00 to 28-APR-12 14:15:00 (CST-6)
Location: ST CHARLES
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous reports of large hail with the biggest hail stones being ping pong ball size.

Hail in ST. LOUIS, MISSOURI
From 28-APR-12 14:22:00 to 28-APR-12 14:32:00 (CST-6)
Location: ROBERTSON
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous reports of large hail was reported across northern portions of St. Louis County.  There were reports of large hail in Hazelwood, Florissant, Ferguson, Black Jack and Riverview.

Thunderstorm Wind in ST. LOUIS, MISSOURI
From 28-APR-12 17:11:00 to 28-APR-12 17:15:00 (CST-6)
Location: BRENTWOOD
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew down a two and a half foot diameter tree as well as numerous large tree limbs in Brentwood.

Hail in ST. LOUIS, MISSOURI
From 28-APR-12 17:15:00 to 28-APR-12 17:15:00 (CST-6)
Location: CONCLAY
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Baseball sized hail was reported in on the north side of Brentwood.

Hail in ST. LOUIS, MISSOURI
From 28-APR-12 17:12:00 to 28-APR-12 17:15:00 (CST-6)
Location: UNIVERSITY CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Golfball sized hail was reported in University City and on the Washington University campus.

Hail in ST. LOUIS, MISSOURI
From 28-APR-12 17:15:00 to 28-APR-12 17:15:00 (CST-6)
Location: RICHMOND HGTS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. LOUIS, MISSOURI
From 28-APR-12 14:24:00 to 28-APR-12 14:24:00 (CST-6)
Location: (STL)LAMBERT FLD ST
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. LOUIS, MISSOURI
From 28-APR-12 14:26:00 to 28-APR-12 14:26:00 (CST-6)
Location: (STL)LAMBERT FLD ST
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. LOUIS (C), MISSOURI
From 28-APR-12 17:19:00 to 28-APR-12 17:30:00 (CST-6)
Location: TOWER GROVE
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A swath of large hail fell over central portions of the city of St. Louis.  Three inch hail was reported at the Edward Jones Dome with golfball sized hail reported at the intersection of Tucker Boulevard and Market Street as well as at the intersection of Hampton Avenue and Interstate 44.

Hail in CALLAWAY, MISSOURI
From 28-APR-12 15:30:00 to 28-APR-12 15:30:00 (CST-6)
Location: MILLERSBURG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WARREN, MISSOURI
From 28-APR-12 16:08:00 to 28-APR-12 16:08:00 (CST-6)
Location: WARRENTON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ST. LOUIS (C), MISSOURI
From 28-APR-12 17:20:00 to 28-APR-12 17:25:00 (CST-6)
Location: CARONDELET
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorm winds blew down several large trees.  One tree fell onto a house on Pernod Avenue causing moderate damage.  Another tree was blown over onto an unoccupied car on Marquette Avenue near Tilles Park.  On Potomac Avenue a large tree was uprooted and landed near a house causing minor roof damage.  A fifteen inch diameter tree was snapped off near the intersection of Mackland Avenue and Southwest Avenue.

Hail in JEFFERSON, MISSOURI
From 28-APR-12 17:25:00 to 28-APR-12 17:25:00 (CST-6)
Location: HEMATITE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in WARREN, MISSOURI
From 28-APR-12 16:15:00 to 28-APR-12 16:15:00 (CST-6)
Location: WRIGHT CITY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. CHARLES, MISSOURI
From 28-APR-12 16:29:00 to 28-APR-12 16:33:00 (CST-6)
Location: WENTZVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JEFFERSON, MISSOURI
From 28-APR-12 19:20:00 to 28-APR-12 19:20:00 (CST-6)
Location: OTTO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in JEFFERSON, MISSOURI
From 28-APR-12 19:36:00 to 28-APR-12 19:36:00 (CST-6)
Location: BARNHART
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. CHARLES, MISSOURI
From 28-APR-12 16:33:00 to 28-APR-12 16:34:00 (CST-6)
Location: WENTZVILLE
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in ST. CHARLES, MISSOURI
From 28-APR-12 16:33:00 to 28-APR-12 16:33:00 (CST-6)
Location: GILMORE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm winds blew plywood and other small pieces of debris onto the westbound lanes of Interstate 70 between mile markers 212 and 213.  Source of the debris unknown at this time.

Hail in ST. CHARLES, MISSOURI
From 28-APR-12 16:38:00 to 28-APR-12 16:38:00 (CST-6)
Location: ALL SAINTS VLG
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. CHARLES, MISSOURI
From 28-APR-12 16:43:00 to 28-APR-12 16:45:00 (CST-6)
Location: LAKE ST LOUIS
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in ST. CHARLES, MISSOURI
From 28-APR-12 16:40:00 to 28-APR-12 16:40:00 (CST-6)
Location: ST PAUL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. CHARLES, MISSOURI
From 28-APR-12 16:55:00 to 28-APR-12 16:55:00 (CST-6)
Location: ST CHARLES
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in ST. LOUIS (C), MISSOURI
From 28-APR-12 14:45:00 to 28-APR-12 14:45:00 (CST-6)
Location: ST LOUIS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

About 100 people were injured and one person was killed when a tent collapsed on a crowd that was gathered after a Cardinals game at Kilroy's Sports Bar (720 South Seventh Street). Seventeen people were taken to area hospitals and treated for their injuries. According to radar data and eye witness reports, outflow winds of 50 to 60 mph from the rear flank downdraft of the supercell thunderstorm arrived between 3:40 p.m. and 3:50 p.m. causing the localized damage near Busch Stadium.

Hail in ST. CHARLES, MISSOURI
From 28-APR-12 23:37:00 to 28-APR-12 23:37:00 (CST-6)
Location: ALL SAINTS VLG
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. CHARLES, MISSOURI
From 29-APR-12 00:03:00 to 29-APR-12 00:03:00 (CST-6)
Location: ST PETERS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in ST. LOUIS (C), MISSOURI
From 28-APR-12 17:19:00 to 28-APR-12 17:25:00 (CST-6)
Location: TOWER GROVE
Magnitude: 3.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Another swath of large hail was reported over the northern portions of the city of St. Louis.  The biggest stones were three inches in diameter.

Hail in LINCOLN, MISSOURI
From 28-APR-12 16:15:00 to 28-APR-12 16:15:00 (CST-6)
Location: SOUTH TROY
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in ST. CHARLES, MISSOURI
From 28-APR-12 16:55:00 to 28-APR-12 16:55:00 (CST-6)
Location: ST CHARLES
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio