A significant heavy rain and flash flooding event occurred on October 16 and into the first part of October 17. The event was set up by an anomalous pool of tropical type moisture (300% of normal) over the western Gulf of Mexico which was then pulled northward by strong low level winds in advance of a westward moving upper level disturbance. There were several other factors in play which contributed to the large amounts of rain, such as a northward moving warm front and a building upper ridge over the eastern Gulf of Mexico. The warm front helped lift the air while the building upper ridge served to weaken the westward moving upper disturbance. This then caused the progression of the heavy convective rains to slow and dump tremendous amounts of rain from southeast Texas to north and central Louisiana and then into west-central Mississippi. By late evening, dry mid level air began pushing east from Texas and allowed the heavy rain shield to move and exit the region by early Tuesday morning. Heavy rains were not the only weather type during this event, a couple of tornadoes occurred along with scattered reports of wind damage.
What makes this event rare is that such a large area received 6 to 10 inches of rain and an even larger area received 4 to 6 inches. Embedded in that swath, a few locations in northern and central Louisiana received a whopping 12 to 17 inches! During this time of year, these kinds of rains usually occur from slow moving tropical cyclones, not from a warm front and westward moving upper disturbance. The result of all this rain was numerous reports of flash flooding, some even significant, across northeast Louisiana and west-central Mississippi. This event will go down in the record books for the amount of real estate covered by heavy rainfall and the several locations that measured extreme amounts.

Thunderstorm Wind in MADISON, LOUISIANA
From 16-OCT-06 19:21:00 to 16-OCT-06 19:21:00 (CST-6)
Location: QUIMBY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A few trees were blown down.

Flash Flood in MOREHOUSE, LOUISIANA
From 16-OCT-06 16:00:00 to 17-OCT-06 00:00:00 (CST-6)
Location: OAK RIDGE
Flood cause: Heavy Rain
Property damage: 2.00M
Crop damage: 400.00K
Reported by: Newspaper

Very heavy rain fell across Morehouse Parish, especially the southern half near Oak Ridge, during the afternoon and evening of October 16th. Four to eight inches of rain fell during this time causing flash flooding across the parish. Several homes were flooded along with many roads across the parish.

Thunderstorm Wind in MOREHOUSE, LOUISIANA
From 16-OCT-06 12:55:00 to 16-OCT-06 12:55:00 (CST-6)
Location: STAMPLEY
Magnitude: 60.00 EG
Property damage: 130.00K
Crop damage: 0.00K
Reported by: Emergency Manager

One mobile home was overturned and heavily damaged along with a semi truck blown over. Additionally, several power lines were blown down around the area.

Tornado in RICHLAND, LOUISIANA
From 16-OCT-06 14:03:00 to 16-OCT-06 14:04:00 (CST-6)
Location: NEW LIGHT
Tornado F-scale: F0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A brief tornado touched down in Caldwell Parish, near the Hebert Community, and crossed the Boeuf River into extreme southern Richland Parish. The weak tornado was only on the ground for a half mile and snapped several branches out of a few trees before dissipating.

Thunderstorm Wind in CONCORDIA, LOUISIANA
From 16-OCT-06 19:45:00 to 16-OCT-06 19:45:00 (CST-6)
Location: FERRIDAY
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A few trees were blown down.

Thunderstorm Wind in EAST CARROLL, LOUISIANA
From 16-OCT-06 14:46:00 to 16-OCT-06 14:46:00 (CST-6)
Location: LAKE PROVIDENCE
Magnitude: 55.00 EG
Property damage: 13.00K
Crop damage: 0.00K
Reported by: COOP Observer

Several trees and power lines were blown down.

Flash Flood in FRANKLIN, LOUISIANA
From 16-OCT-06 14:30:00 to 17-OCT-06 00:00:00 (CST-6)
Location: LIDDIEVILLE
Flood cause: Heavy Rain
Property damage: 10.00M
Crop damage: 400.00K
Reported by: Emergency Manager

Tremendous amounts of rain fell across Franklin Parish during the afternoon and evening of October 16th. Eight to fifteen inches of rain fell during this time causing significant flooding across the parish. Two to three hundred homes were flooded along with a large majority of the roads across the parish. Many roads had sections washed out and were impassable. Locals who have lived in the area all their life mentioned they have never seen water like that before.

Thunderstorm Wind in EAST CARROLL, LOUISIANA
From 16-OCT-06 16:55:00 to 16-OCT-06 17:00:00 (CST-6)
Location: LAKE PROVIDENCE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A few trees were blown down north of town.

Thunderstorm Wind in RICHLAND, LOUISIANA
From 16-OCT-06 14:48:00 to 16-OCT-06 14:48:00 (CST-6)
Location: ARCHIBALD
Magnitude: 55.00 EG
Property damage: 11.00K
Crop damage: 0.00K
Reported by: County Official

Several trees and power lines were blown down.

Flash Flood in RICHLAND, LOUISIANA
From 16-OCT-06 14:30:00 to 17-OCT-06 00:00:00 (CST-6)
Location: ARCHIBALD
Flood cause: Heavy Rain
Property damage: 10.00M
Crop damage: 200.00K
Reported by: Emergency Manager

Tremendous amounts of rain fell across Richland Parish during the afternoon and evening of October 16th. Eight to fifteen inches of rain fell during this time causing significant flooding across the parish. Dozens of homes were flooded along with a large majority of the roads across the parish. Many roads had sections washed out and were impassable. Locals who have lived in the area all their life mentioned they have never seen water like that before.

Flash Flood in WEST CARROLL, LOUISIANA
From 16-OCT-06 16:00:00 to 17-OCT-06 00:00:00 (CST-6)
Location: BEAR SKIN
Flood cause: Heavy Rain
Property damage: 4.00M
Crop damage: 400.00K
Reported by: Newspaper

Very heavy rain fell across West Carroll Parish, especially the southern half near Epps, during the afternoon and evening of October 16th. Five to ten inches of rain fell during this time causing flash flooding across the parish. Several homes were flooded along with many roads across the parish.

Flash Flood in MADISON, LOUISIANA
From 16-OCT-06 18:00:00 to 17-OCT-06 00:00:00 (CST-6)
Location: WAVERLY
Flood cause: Heavy Rain
Property damage: 1.00M
Crop damage: 700.00K
Reported by: Law Enforcement

Very heavy rain fell across Madison Parish, especially the southern half, during the afternoon and evening of October 16th. Six to ten inches of rain fell during this time causing flash flooding across the parish. Several homes were flooded along with many roads across the parish.