A warm front had begun to lift north across Deep East Texas and Southwest Louisiana during the early morning hours of May 3rd, in response to a developing area of surface low pressure over Westcentral Texas along a cold front that extended northeast into Central Oklahoma. This cold front was out ahead of a positively tilted upper trough, as it progressed southeast into Oklahoma during the afternoon. Meanwhile, a shortwave trough ejecting northeast over Southeast Texas and Central Louisiana ahead of the main upper trough during the morning contributed to scattered to numerous shower and thunderstorm development over Southeast Texas and Southwest Louisiana prior to daybreak on the 3rd, which advanced northeast into Deep East Texas and Central/Southern Louisiana shortly there-afterwards. Additional showers and thunderstorms quickly developed over Southeast Oklahoma and Southwest Arkansas along and just ahead of the front and associated upper trough around/shortly after daybreak. Given the adequate shear and steep lapse rates aloft ahead of the main upper trough, some of the storms over Southeast Oklahoma became severe, producing large hail during the morning. Isolated severe thunderstorms also developed farther south across East Texas and Western Louisiana, with large hail initially the main threat. However, as the air mass destabilized with additional diurnal heating ahead of the front, more numerous strong to severe thunderstorms developed by afternoon as large scale forcing increased ahead of the approaching upper trough, interacting with the warm front over East Texas/Western Louisiana, as well as a mesoscale boundary left behind over portions of the Sam Rayburn Country across Central Louisiana from the morning storms. Large hail and damaging winds were common with these storms during the afternoon and early evening, before the storms exited the region by mid-evening. Isolated areas of flash flooding was also observed across portions of Southwest Arkansas and East Texas, where storms produced very heavy rainfall and briefly moved repeatedly over the same areas.

Hail in CADDO, LOUISIANA
From 03-MAY-17 15:30:00 to 03-MAY-17 15:30:00 (CST-6)
Location: METCALF
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Dime size hail was reported on Freedom's Way in the Eagle's Nest Subdivision in Keithville, Louisiana.

Thunderstorm Wind in DE SOTO, LOUISIANA
From 03-MAY-17 16:00:00 to 03-MAY-17 16:00:00 (CST-6)
Location: GRAND CANE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were downed in the Grand Cane community.

Thunderstorm Wind in CADDO, LOUISIANA
From 03-MAY-17 16:00:00 to 03-MAY-17 16:00:00 (CST-6)
Location: LA ROSEN
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Trees were downed at the Southern Hills Park in South Shreveport.

Flash Flood in SABINE, LOUISIANA
From 03-MAY-17 17:48:00 to 03-MAY-17 20:30:00 (CST-6)
Location: TORO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Excessive heavy rainfall resulted in the closure of Hwy. 473 south southwest of Florien, Louisiana.

Thunderstorm Wind in SABINE, LOUISIANA
From 03-MAY-17 17:00:00 to 03-MAY-17 17:00:00 (CST-6)
Location: NEGREET
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were downed along Hwy. 191 west of Florien, Louisiana.