Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS Shreveport, LA

April 9, 20215 counties in Texas

NWS Shreveport, LA issued this flash flood warning at Apr 9, 2021, 6:33 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: Apr 9, 2021, 6:33 PM CDT (23:33 UTC)
Expired: Apr 9, 2021, 9:45 PM CDT
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

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

The radar

The Shreveport radar (KSHV), 107 km from the middle of the area, began a volume at 23:34 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 12:00Z, 11.6 hours before the alert went out and 116 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: 928 J/kg
Mixed-layer CIN: -310 J/kg
Mixed-layer LCL: 1043 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 61 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

372 
WGUS54 KSHV 092333
FFWSHV
TXC073-347-365-401-423-100245-
/O.NEW.KSHV.FF.W.0001.210409T2333Z-210410T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
633 PM CDT Fri Apr 9 2021

The National Weather Service in Shreveport has issued a

* Flash Flood Warning for...
  Northwestern Nacogdoches County in eastern Texas...
  Northern Cherokee County in northeastern Texas...
  Southwestern Panola County in northeastern Texas...
  Southern Rusk County in northeastern Texas...
  Southeastern Smith County in northeastern Texas...

* Until 945 PM CDT.

* At 633 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Jacksonville, Henderson, Rusk, New Salem, Ponta, Minden, Pinehill, 
  Maydelle, New Summerfield, Gallatin, Reklaw, Brachfield, 
  Laneville, Glenfawn, Concord, Church Hill, Chapman and Fairplay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3222 9483 3224 9470 3227 9467 3221 9453
      3211 9445 3204 9446 3201 9450 3195 9472
      3181 9499 3168 9516 3169 9526 3173 9532
      3191 9535 3211 9509

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 2 HOURS 

$$

05

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 11:41 AM CDT	Special Weather Statement	SHV	Franklin, Red River, Titus	49 min
Apr 9, 12:04 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass, Morris, Red River, Titus	41 min
Apr 9, 12:29 PM CDT	Special Weather Statement	SHV	Upshur	46 min
Apr 9, 12:41 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Cass, Morris, Titus	31 min
Apr 9, 12:45 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Morris, Red River, Titus	33 min
Apr 9, 1:34 PM CDT	Severe Thunderstorm Warning	SHV	Smith, Wood	21 min
Apr 9, 3:22 PM CDT	Special Weather Statement	SHV	Morris	53 min
Apr 9, 4:31 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Nacogdoches, Panola, Rusk, Shelby	59 min
Apr 9, 5:42 PM CDT	Special Weather Statement	SHV	Nacogdoches	63 min
Apr 9, 5:49 PM CDT	Severe Thunderstorm Warning	SHV	Panola, Shelby	56 min
Apr 9, 6:01 PM CDT	Severe Thunderstorm Warning	SHV	Panola, Rusk, Shelby	59 min
Apr 9, 6:39 PM CDT	Special Weather Statement	SHV	Cherokee	51 min
Apr 9, 6:53 PM CDT	Severe Thunderstorm Warning	SHV	Panola, Rusk	45 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.