A vigorous, upper level storm system moved across eastern Kansas into southern Missouri during the afternoon and evening hours of May 20th. A portion of this trough swung southward into the middle Red River Valley of northeast Texas, southeast Oklahoma, southwest Arkansas and northern Louisiana. An outflow boundary was present across the region from earlier convection that was present during the morning of the 20th. A moderately unstable airmass, a weak outflow boundary, and plentiful moisture combined with the influence of the upper storm system were all the ingredients needed for strong to severe thunderstorms. The thunderstorms produced damaging wind gusts along with large hail across the region.

Hail in CADDO, LOUISIANA
From 20-MAY-10 14:35:00 to 20-MAY-10 14:35:00 (CST-6)
Location: SPRING RIDGE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CADDO, LOUISIANA
From 20-MAY-10 14:44:00 to 20-MAY-10 14:44:00 (CST-6)
Location: KEITHVILLE ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in CLAIBORNE, LOUISIANA
From 20-MAY-10 15:27:00 to 20-MAY-10 15:27:00 (CST-6)
Location: LISBON
Magnitude: 53.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was downed in the Lisbon community.

Thunderstorm Wind in BIENVILLE, LOUISIANA
From 20-MAY-10 15:45:00 to 20-MAY-10 15:45:00 (CST-6)
Location: BIENVILLE
Magnitude: 53.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was downed across Hwy. 9 west of Bienville, Louisiana.

Thunderstorm Wind in OUACHITA, LOUISIANA
From 20-MAY-10 16:57:00 to 20-MAY-10 16:57:00 (CST-6)
Location: LAKESHORE
Magnitude: 52.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A restaurant sign was blown down onto cars in the parking lot.

Hail in LA SALLE, LOUISIANA
From 20-MAY-10 17:06:00 to 20-MAY-10 17:06:00 (CST-6)
Location: OLLA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CADDO, LOUISIANA
From 20-MAY-10 14:49:00 to 20-MAY-10 14:49:00 (CST-6)
Location: GAYLES
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in DE SOTO, LOUISIANA
From 20-MAY-10 14:57:00 to 20-MAY-10 14:57:00 (CST-6)
Location: STONEWALL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in CADDO, LOUISIANA
From 20-MAY-10 14:14:00 to 20-MAY-10 14:14:00 (CST-6)
Location: MOORINGSPORT
Magnitude: 54.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A tree fell onto a school bus.  There were no report of injuries.

Hail in CADDO, LOUISIANA
From 20-MAY-10 14:47:00 to 20-MAY-10 14:47:00 (CST-6)
Location: KEITHVILLE ARPT
Magnitude: 1.00 
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

It was reported that vehicles were damaged by the hail.

Thunderstorm Wind in CADDO, LOUISIANA
From 20-MAY-10 14:35:00 to 20-MAY-10 14:35:00 (CST-6)
Location: SPRING RIDGE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Large tree limbs and branches were downed.

Thunderstorm Wind in CADDO, LOUISIANA
From 20-MAY-10 14:49:00 to 20-MAY-10 14:49:00 (CST-6)
Location: GAYLES
Magnitude: 63.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The wind gust was measured approximately 13 miles southeast of Shreveport, Louisiana.