A shallow arctic cold front was draped across east Texas and north Louisiana just south of the Interstate 20 corridor during the late afternoon and evening of the 21st.  This resulted in temperatures in the 40s north of the front across southwest Arkansas and extreme northeast Texas, while temperatures rose to the upper 60s to middle 70s south of the front across deep east Texas and north central Louisiana. Meanwhile, a strong shortwave trough traversed east across the Southern Plains, spreading strong shear and instability aloft along and behind the front.  This resulted in the development of scattered to numerous severe thunderstorms across deep east Texas, northwest and north central Louisiana.  Various reports of large hail up to the size of golfballs were received across northwest and north central Louisiana, with bands of thunderstorms training along the front across Grant and LaSalle Parishes. This resulted in extensive flash flooding from Dry Prong to Jena, with many roads flooded, and even several roads barricaded, as an estimated three to five inches of rainfall, with isolated higher amounts across southern Grant Parish, had fallen over these areas.

Hail in GRANT, LOUISIANA
From 21-FEB-08 18:18:00 to 21-FEB-08 18:18:00 (CST-6)
Location: ZION
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Quarter sized hail covered the ground to several inches west of Georgetown.  Report came from the family of a NWS employee.

Hail in WINN, LOUISIANA
From 21-FEB-08 18:30:00 to 21-FEB-08 18:30:00 (CST-6)
Location: JORDON HILL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Quarter sized hail covering the ground to several inches west of Tullos. The report came from the family of a NWS employee.

Flash Flood in LA SALLE, LOUISIANA
From 21-FEB-08 23:30:00 to 22-FEB-08 02:30:00 (CST-6)
Location: TROUT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Highway 84 between Jena and Tullos was barricaded due to flooding.

Flash Flood in LA SALLE, LOUISIANA
From 21-FEB-08 23:30:00 to 22-FEB-08 02:30:00 (CST-6)
Location: MIDWAY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Highway 8 was barricaded due to flooding just west of Jena.

Hail in DE SOTO, LOUISIANA
From 21-FEB-08 21:55:00 to 21-FEB-08 21:55:00 (CST-6)
Location: FRIERSON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail fell in the Frierson Community.

Hail in BOSSIER, LOUISIANA
From 21-FEB-08 22:20:00 to 21-FEB-08 22:20:00 (CST-6)
Location: HAUGHTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Hail in BOSSIER, LOUISIANA
From 21-FEB-08 22:30:00 to 21-FEB-08 22:30:00 (CST-6)
Location: KORAN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Nickel sized hail reported in the Koran community along the Bossier parish/Webster Parish line.

Flash Flood in GRANT, LOUISIANA
From 21-FEB-08 23:25:00 to 22-FEB-08 02:30:00 (CST-6)
Location: DRY PRONG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Roads were flooded in Dry Prong.