An upper level low pressure system slowly ejected northeast across the piney woods of East Texas during the evening through the morning hours of May 10th-11th. A southerly low level jet present ahead of the low spilled copious amounts of low level moisture north into East Texas and Western Louisiana, with strong large scale forcing ahead of the low enhancing numerous shower and thunderstorm development which moved repeatedly over these areas throughout much of the overnight into the early morning hours. Widespread rainfall amounts of 3-6+ inches fell across much of Deep and extreme Eastern Texas through mid-morning on the 11th, resulting in instances of flash flooding across these areas. Catastrophic flash flooding was observed within the city of Nacogdoches, as these higher amounts fell over the city and atop the Bayou La Nana watershed, with the bayou quickly rising sharply 14.3 feet before cresting at 19.65 feet at 10 am on the 11th. This left much of Central Nacogdoches, including a portion of Stephen F. Austin State University, inundated, before the flood waters receded during the afternoon.

Flash Flood in NACOGDOCHES, TEXAS
From 11-MAY-23 01:45:00 to 11-MAY-23 10:45:00 (CST-6)
Location: CLIMAX
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple streets were flooded and closed across the south side of Nacogdoches. Flooding of roads were widespread across Nacogdoches County.

Flash Flood in NACOGDOCHES, TEXAS
From 11-MAY-23 01:55:00 to 11-MAY-23 10:45:00 (CST-6)
Location: NACOGDOCHES REGL ARP
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The 3500 block of South Street in Nacogdoches was flooded and closed. A water rescue was needed for a stalled vehicle in the flood waters.

Flash Flood in SHELBY, TEXAS
From 11-MAY-23 04:45:00 to 11-MAY-23 05:30:00 (CST-6)
Location: TIMPSON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Highway 96 south of Tenaha was closed due to flooding. Numerous roads were also flooded and closed in Timpson.

Flash Flood in RUSK, TEXAS
From 11-MAY-23 05:06:00 to 11-MAY-23 11:00:00 (CST-6)
Location: MT HOPE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiples roads were flooded throughout Central Rusk County with a few roads closed.

Flash Flood in NACOGDOCHES, TEXAS
From 11-MAY-23 05:57:00 to 11-MAY-23 10:45:00 (CST-6)
Location: SACUL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple roads remain flooded and closed across the south side of Nacogdoches due to significant flooding along Bayou La Nana. Multiple other roads were also flooded and closed throughout much of Nacogdoches County.

Flash Flood in PANOLA, TEXAS
From 11-MAY-23 06:00:00 to 11-MAY-23 11:00:00 (CST-6)
Location: RIDERVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Multiple roads were flooded and closed through Central and Southern Panola County.

Flash Flood in NACOGDOCHES, TEXAS
From 11-MAY-23 09:00:00 to 11-MAY-23 10:45:00 (CST-6)
Location: REDFIELD
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Other Federal Agency

The USGS Gauge on Bayou La Nana in Nacogdoches recorded a 14.3 foot rise and crested at 19.65 feet at 10 am, May 11th. This resulted in catastrophic flooding across the city of Central and Southern Nacogdoches, including the Stephen F. Austin State University campus.