Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 26, NWS Shreveport, LA

July 11, 20215 counties in Texas

NWS Shreveport, LA issued this flash flood warning at Jul 11, 2021, 9:10 PM CDT for 5 counties in Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 11, 2021, 9:10 PM CDT (02:10 UTC)
Expired: Jul 12, 2021, 12:15 AM CDT
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

Counties Cherokee County, TX, Panola County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX

The radar

The Shreveport radar (KSHV), 148 km from the middle of the area, began a volume at 02:12 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.

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 2.2 hours before the alert went out and 157 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 868 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 1186 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 163 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.5

Open this sounding in Storm Lab

The text

As transmitted.

347 
WGUS54 KSHV 120210
FFWSHV
TXC073-365-401-419-423-120515-
/O.NEW.KSHV.FF.W.0026.210712T0210Z-210712T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
910 PM CDT Sun Jul 11 2021

The National Weather Service in Shreveport has issued a

* Flash Flood Warning for...
  Shelby County in eastern Texas...
  Northern Cherokee County in northeastern Texas...
  Southwestern Panola County in northeastern Texas...
  Central Rusk County in northeastern Texas...
  Southeastern Smith County in northeastern Texas...

* Until 1215 AM CDT.

* At 910 PM CDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  2 and 4 inches of rain have fallen along the Smith/Cherokee County 
  line as well as much of Central Rusk County. The expected rainfall 
  rate is 1.5 to 2.5 inches in 1 hour. Additional rainfall amounts 
  of 2 to 4 inches are possible in the warned area through 1215 AM, 
  as additional thunderstorms containing heavy rainfall continues to 
  develop and move over the warned area. Flash flooding is ongoing 
  or expected to begin shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar and automated gauges.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Jacksonville, Henderson, Bullard, Troup, Turnertown, Joinerville, 
  Mixon, Minden, Mount Selman, Pinehill, Reese, New Summerfield, 
  Mount Enterprise, Cuney, Concord, Brachfield, Laneville, Church 
  Hill, Chapman and Teaselville.

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.

Please report observed flooding to local emergency services or law 
enforcement and request they pass this information to the National 
Weather Service when you can do so safely.

&&

LAT...LON 3220 9546 3220 9454 3192 9451 3196 9545
      3198 9545 3199 9545 3202 9543 3204 9544
      3204 9542 3206 9543 3207 9544 3208 9542
      3211 9546 3213 9546 3215 9548 3218 9547
      3218 9546 3219 9547

FLASH FLOOD...RADAR AND GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...1.5-2.5 INCHES IN 1 HOUR

$$

15

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 11, 7:23 PM CDT	Special Weather Statement	SHV	Rusk	52 min
Jul 11, 8:25 PM CDT	Areal Flood Advisory	SHV	Rusk	110 min
Jul 11, 8:31 PM CDT	Special Weather Statement	SHV	Rusk	44 min
Jul 11, 8:40 PM CDT	Special Weather Statement	SHV	Cherokee	50 min
Jul 11, 9:49 PM CDT	Special Weather Statement	SHV	Cherokee	41 min
Jul 11, 10:27 PM CDT	Special Weather Statement	SHV	Nacogdoches	48 min
Jul 11, 10:50 PM CDT	Special Weather Statement	SHV	Smith	40 min
Jul 11, 11:12 PM CDT	Special Weather Statement	SHV	Smith	48 min
Jul 11, 11:15 PM CDT	Special Weather Statement	SHV	Gregg	45 min
Jul 12, 12:13 AM CDT	Flash Flood Warning	SHV	Cherokee, Rusk, Smith	4 hr
Jul 12, 2:10 AM CDT	Areal Flood Advisory	SHV	Cherokee, Nacogdoches	3 hr
Jul 12, 6:28 AM CDT	River Flood Warning	SHV	Anderson, Cherokee, Houston, Trinity	21 days
Jul 12, 6:28 AM CDT	River Flood Warning	SHV	Nacogdoches, Rusk	25 hr
Jul 12, 8:20 AM CDT	River Flood Warning	SHV	Angelina, Houston, Polk, Trinity, Tyler	11 days
Jul 12, 1:56 PM CDT	Special Weather Statement	SHV	Wood	49 min
Jul 12, 2:37 PM CDT	Severe Thunderstorm Warning	SHV	Wood	43 min

Nearby

Flash Flood Warnings in Texas, 2021 Every flash flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.