Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 28, NWS Shreveport, LA

July 19, 2021Gregg County, Harrison County, Rusk County, Texas

NWS Shreveport, LA issued this flash flood warning at Jul 19, 2021, 9:29 AM CDT for Gregg County, Harrison County, Rusk County, Texas. It was in force for 2 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: Jul 19, 2021, 9:29 AM CDT (14:29 UTC)
Expired: Jul 19, 2021, 11:30 AM CDT
In force: 2 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

Counties Gregg County, TX, Harrison County, TX, Rusk County, TX

The radar

The Shreveport radar (KSHV), 92 km from the middle of the area, began a volume at 14:28 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
Jul 19, 10:03 AM CDT	FLASH FLOOD	2 Se Longview, TX	FLOODING REPORTED AT GREEN AND COTTON INTERSECTION.
Jul 19, 10:10 AM CDT	FLASH FLOOD	2 Se Longview, TX	CORRECTS PREVIOUS FLASH FLOOD REPORT FROM 2 SE LONGVIEW. FLOODING REPORTED AT HIGH STREET AND COTTON INTERSECTION. SEVERAL WATER RESCUES REPORTED AT THIS INTERESECTION.
Jul 19, 10:10 AM CDT	FLASH FLOOD	2 Se Longview, TX	FLOODING REPORTED AT HIGH STREET AND COTTON INTERSECTION.

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 12:00Z, 2.5 hours before the alert went out and 100 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: 1705 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 807 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

741 
WGUS54 KSHV 191429
FFWSHV
TXC183-203-401-191630-
/O.NEW.KSHV.FF.W.0028.210719T1429Z-210719T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
929 AM CDT Mon Jul 19 2021

The National Weather Service in Shreveport has issued a

* Flash Flood Warning for...
  Gregg County in northeastern Texas...
  West Central Harrison County in northeastern Texas...
  Northwestern Rusk County in northeastern Texas...

* Until 1130 AM CDT.

* At 929 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 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...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...
  Longview, Kilgore, White Oak, Gladewater, Overton, New London, 
  Clarksville City, Liberty City, Lakeport, Warren City, Rolling 
  Meadows, Laird Hill, Monroe and Judson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3236 9497 3251 9497 3258 9482 3263 9478
      3261 9470 3261 9468 3245 9467 3232 9465
      3229 9497

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

$$

04

2 follow-up statements

826 
WGUS74 KSHV 191526
FFSSHV

Flash Flood Statement
National Weather Service Shreveport LA
1026 AM CDT Mon Jul 19 2021

TXC183-203-401-191630-
/O.CON.KSHV.FF.W.0028.000000T0000Z-210719T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gregg TX-Harrison TX-Rusk TX-
1026 AM CDT Mon Jul 19 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1130 AM CDT THIS 
MORNING FOR GREGG, WEST CENTRAL HARRISON AND NORTHWESTERN RUSK 
COUNTIES...

At 1026 AM CDT, the public reported flash flooding in Longview. 
Between 2 and 4 inches of rain have fallen. Additional rainfall 
amounts up to 1 inch are possible in the warned area.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Public reported.

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...
  Longview, Kilgore, White Oak, Gladewater, Overton, New London, 
  Clarksville City, Liberty City, Lakeport, Warren City, Rolling 
  Meadows, Laird Hill, Monroe and Judson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3236 9497 3251 9497 3258 9482 3263 9478
      3261 9470 3261 9468 3245 9467 3232 9465
      3229 9497

FLASH FLOOD...OBSERVED

$$

04

678 
WGUS74 KSHV 191626
FFSSHV

Flash Flood Statement
National Weather Service Shreveport LA
1126 AM CDT Mon Jul 19 2021

TXC183-203-401-191636-
/O.EXP.KSHV.FF.W.0028.000000T0000Z-210719T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Gregg TX-Harrison TX-Rusk TX-
1126 AM CDT Mon Jul 19 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1130 AM CDT THIS MORNING FOR 
GREGG, WEST CENTRAL HARRISON AND NORTHWESTERN RUSK COUNTIES...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.  Another 
round of heavy rain with thunderstorms is possible this afternoon, 
so be alert for future advisories and warnings.

LAT...LON 3236 9497 3251 9497 3258 9482 3263 9478
      3261 9470 3261 9468 3245 9467 3232 9465
      3229 9497

$$

04

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 5:57 AM CDT	Special Weather Statement	SHV	Cass, Marion	48 min
Jul 19, 7:27 AM CDT	Special Weather Statement	SHV	Marion	48 min
Jul 19, 7:32 AM CDT	Special Weather Statement	SHV	Gregg, Upshur	43 min
Jul 19, 8:17 AM CDT	Special Weather Statement	SHV	Gregg, Harrison, Upshur	43 min
Jul 19, 8:39 AM CDT	Areal Flood Advisory	SHV	Harrison, Marion	3 hr
Jul 19, 10:09 AM CDT	Areal Flood Advisory	SHV	Gregg, Harrison, Panola, Rusk	3 hr
Jul 19, 11:21 AM CDT	Areal Flood Advisory	SHV	Cherokee, Rusk, Smith	114 min
Jul 19, 12:56 PM CDT	Flash Flood Warning	SHV	Smith	3 hr
Jul 19, 4:35 PM CDT	Special Weather Statement	SHV	Red River	40 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.