Alert archive / Texas / Flash Flood Warnings in 2023
Flash Flood Warning 21, NWS Shreveport, LA
NWS Shreveport, LA issued this flash flood warning at May 11, 2023, 1:37 AM CDT for 5 counties in Texas. It was in force for 5 hr. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 11, 2023, 1:37 AM CDT (06:37 UTC)
- Expired
- May 11, 2023, 6:30 AM CDT
- In force
- 5 hr
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
- Flood severity
- None
Counties Cherokee County, TX, Nacogdoches County, TX, Rusk County, TX, San Augustine County, TX, Shelby County, TX
The radar
The Shreveport radar (KSHV), 135 km from the middle of the area, began a volume at 06:38 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 11, 2:45 AM CDT | FLASH FLOOD | 1 Ssw Nacogdoches, TX | CORRECTS PREVIOUS FLASH FLOOD REPORT FROM 1 SSW NACOGDOCHES. SOUTH SIDE OF NACOGDOCHES STREETS ARE CLOSED DUE TO FLOODING. FLOODING OF ROADS WIDESPREAD ACROSS THE COUNTY. |
| May 11, 2:55 AM CDT | FLASH FLOOD | 3 Ssw Nacogdoches, TX | SHERIFF DEPARTMENTS REPORTS ROAD COMPLETELY UNDER WATER AROUND THE 3500 BLOCK OF SOUTH STREET IN NACOGDOCHES, TX. ALSO, A WATER RESCUE WAS UNDERWAY ON A STALLED VEHICLE. |
| May 11, 5:45 AM CDT | FLASH FLOOD | Timpson, TX | HWY 96 NORTH OF TIMPSON IS CLOSED DUE TO FLOODING. NUMEROUS ROADS CLOSED IN TIMPSON. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Shreveport, LA (KSHV), launched 00:00Z, 6.6 hours before the alert went out and 144 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 50 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 856 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 122 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
634
WGUS54 KSHV 110637
FFWSHV
TXC073-347-401-405-419-110930-
/O.NEW.KSHV.FF.W.0021.230511T0637Z-230511T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
137 AM CDT Thu May 11 2023
The National Weather Service in Shreveport has issued a
* Flash Flood Warning for...
Nacogdoches County in eastern Texas...
Northwestern San Augustine County in eastern Texas...
Western Shelby County in eastern Texas...
Southeastern Cherokee County in northeastern Texas...
Southern Rusk County in northeastern Texas...
* Until 430 AM CDT.
* At 137 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. The expected rainfall rate is 1
to 2 inches in 1 hour. Additional rainfall amounts of 2 to 4
inches are possible in the warned area. Flash flooding is ongoing
or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Nacogdoches, Jacksonville, Rusk, Center, San Augustine, Alto,
Tenaha, Timpson, Garrison, Wells, Trawick, Melrose, Martinsville,
Woden, Douglass, Sacul, New Salem, Forest, Morrill and Ponta.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3195 9523 3195 9407 3144 9414 3154 9484
3145 9505 3147 9507 3147 9510 3152 9510
3154 9514
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
132 follow-up statements
421
WGUS74 KSHV 110728
FFSSHV
Flash Flood Statement
National Weather Service Shreveport LA
228 AM CDT Thu May 11 2023
TXC073-347-401-405-419-110930-
/O.CON.KSHV.FF.W.0021.000000T0000Z-230511T0930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cherokee TX-Nacogdoches TX-Rusk TX-San Augustine TX-Shelby TX-
228 AM CDT Thu May 11 2023
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 AM CDT EARLY THIS
MORNING FOR NACOGDOCHES, NORTHWESTERN SAN AUGUSTINE, WESTERN SHELBY,
SOUTHEASTERN CHEROKEE AND SOUTHERN RUSK COUNTIES...
At 228 AM CDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. The expected rainfall rate is 1 to 2
inches in 1 hour. Additional rainfall amounts of 1 to 3 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Nacogdoches, Timpson, Garrison, Trawick, Melrose, Martinsville,
Douglass, Sacul, New Salem, Appleby, and Cushing.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3195 9523 3195 9407 3144 9414 3154 9484
3145 9505 3147 9507 3147 9510 3152 9510
3154 9514
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
20863
WGUS54 KSHV 110919
FFWSHV
TXC073-347-401-405-419-111130-
/O.EXT.KSHV.FF.W.0021.000000T0000Z-230511T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
419 AM CDT Thu May 11 2023
The National Weather Service in Shreveport has extended the
* Flash Flood Warning for...
Nacogdoches County in eastern Texas...
Northwestern San Augustine County in eastern Texas...
Western Shelby County in eastern Texas...
Southeastern Cherokee County in northeastern Texas...
Southern Rusk County in northeastern Texas...
* Until 630 AM CDT.
* At 419 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 2 and 5 inches of rain
have fallen. The expected rainfall rate is 1 to 2 inches in 1
hour. Additional rainfall amounts of 1 to 2 inches are possible in
the warned area. Flash flooding is ongoing or expected to begin
shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Nacogdoches, Jacksonville, Rusk, Center, San Augustine, Alto,
Tenaha, Timpson, Garrison, Wells, Trawick, Melrose, Martinsville,
Woden, Douglass, Sacul, New Salem, Forest, Morrill and Ponta.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3195 9523 3195 9407 3144 9414 3154 9484
3145 9505 3147 9507 3147 9510 3152 9510
3154 9514
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL RATE...1-2 INCHES IN 1 HOUR
$$
19The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 8:35 PM CDT | Special Weather Statement | SHV | Shelby | 25 min |
| May 10, 10:53 PM CDT | Special Weather Statement | SHV | Angelina | 37 min |
| May 11, 2:50 AM CDT | Special Weather Statement | SHV | Nacogdoches | 40 min |
| May 11, 3:15 AM CDT | Severe Thunderstorm Warning | SHV | Nacogdoches, San Augustine, Shelby | 60 min |
| May 11, 5:10 AM CDT | Severe Thunderstorm Warning | SHV | Nacogdoches, Panola, Rusk, Shelby | 50 min |
| May 11, 5:49 AM CDT | Flash Flood Warning | SHV | Panola, Rusk, Shelby | 6 hr |
| May 11, 6:47 AM CDT | Special Weather Statement | SHV | Panola | 28 min |
| May 11, 6:49 AM CDT | Special Weather Statement | SHV | Panola | 41 min |
| May 11, 7:44 AM CDT | Flash Flood Warning | SHV | Panola, Shelby | 6 hr |
| May 11, 8:17 AM CDT | Areal Flood Warning | SHV | Nacogdoches, Rusk, Shelby | 11 hr |
| May 11, 8:25 AM CDT | Severe Thunderstorm Warning | SHV | Shelby | 65 min |
| May 11, 8:32 AM CDT | River Flood Warning | SHV | Nacogdoches, Rusk, San Augustine, Shelby | 8 days |
| May 11, 8:32 AM CDT | River Flood Warning | SHV | Sabine, San Augustine | 12 hr |
| May 11, 8:33 AM CDT | River Flood Warning | SHV | Nacogdoches, Rusk | 51 hr |
| May 11, 8:46 AM CDT | Flash Flood Warning | SHV | Nacogdoches | 3 hr |
| May 11, 11:46 AM CDT | Areal Flood Warning | SHV | Panola, Rusk, Shelby | 6 hr |
| May 11, 1:39 PM CDT | Areal Flood Warning | SHV | Panola, Shelby | 4 hr |
Nearby
Flash Flood Warnings in Texas, 2023Every flash flood warning in 2023
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.