Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 21, NWS Fort Worth, TX

August 18, 2021Wise County, Texas

NWS Fort Worth, TX issued this flash flood warning at Aug 18, 2021, 9:40 AM CDT for Wise County, Texas. It was in force for 2 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: Aug 18, 2021, 9:40 AM CDT (14:40 UTC)
Expired: Aug 18, 2021, 11:45 AM CDT
In force: 2 hr
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Flood severity: None

County Wise County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 97 km from the middle of the area, began a volume at 14:44 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

Fort Worth, TX (KFWD), launched 12:00Z, 2.7 hours before the alert went out and 74 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: 500 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 580 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

689 
WGUS54 KFWD 181440
FFWFWD
TXC497-181645-
/O.NEW.KFWD.FF.W.0021.210818T1440Z-210818T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Fort Worth TX
940 AM CDT Wed Aug 18 2021

The National Weather Service in Fort Worth has issued a

* Flash Flood Warning for...
  Northwestern Wise County in north central Texas...

* Until 1145 AM CDT.

* At 940 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Additional rainfall amounts of 
  1 to 2 inches are possible. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...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...
  Bridgeport, Alvord, Chico, Runaway Bay and Lake Bridgeport.

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 3333 9789 3335 9787 3337 9785 3339 9782
      3342 9770 3323 9770 3315 9792

FLASH FLOOD...RADAR INDICATED

$$

79

1 follow-up statement

181 
WGUS74 KFWD 181643
FFSFWD

Flash Flood Statement
National Weather Service Fort Worth TX
1143 AM CDT Wed Aug 18 2021

TXC497-181653-
/O.EXP.KFWD.FF.W.0021.000000T0000Z-210818T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Wise TX-
1143 AM CDT Wed Aug 18 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1145 AM CDT THIS MORNING FOR 
NORTHWESTERN WISE COUNTY...

New flooding is no longer expected to pose a threat. However, 
earlier rainfall may continue to run off and cause flooding of 
streams and creeks as well as other low lying and poor drainage 
areas. Please continue to heed remaining road closures.

A Flash Flood Watch remains in effect until 1000 PM CDT Wednesday 
for portions of north central Texas and northeast Texas.

LAT...LON 3333 9789 3335 9787 3337 9785 3339 9782
      3342 9770 3323 9770 3315 9792

$$

79

The office that day

Everything else NWS Fort Worth, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 17, 7:48 PM CDT	Flash Flood Watch	FWD	Collin, Comanche, Cooke, Dallas, Delta, Denton and 23 more	26 hr
Aug 18, 3:16 AM CDT	Areal Flood Advisory	FWD	Kaufman	104 min
Aug 18, 4:08 AM CDT	Areal Flood Advisory	FWD	Henderson, Van Zandt	112 min
Aug 18, 6:40 AM CDT	Areal Flood Advisory	FWD	Jack, Montague, Wise	2 hr
Aug 18, 7:55 AM CDT	Areal Flood Advisory	FWD	Eastland, Stephens	3 hr
Aug 18, 8:18 AM CDT	Areal Flood Advisory	FWD	Jack, Palo Pinto	3 hr
Aug 18, 9:14 AM CDT	Areal Flood Advisory	FWD	Jack, Montague, Wise	3 hr
Aug 18, 9:55 AM CDT	Flash Flood Warning	FWD	Eastland, Palo Pinto	3 hr
Aug 18, 10:42 AM CDT	Areal Flood Advisory	FWD	Palo Pinto, Parker, Wise	2 hr
Aug 18, 10:49 AM CDT	Areal Flood Advisory	FWD	Wise	116 min
Aug 18, 10:56 AM CDT	Areal Flood Advisory	FWD	Dallas, Denton, Tarrant	2 hr
Aug 18, 11:50 AM CDT	Areal Flood Advisory	FWD	Collin, Dallas, Denton	3 hr
Aug 18, 1:05 PM CDT	Areal Flood Advisory	FWD	Dallas, Denton, Parker, Tarrant, Wise	115 min
Aug 18, 1:56 PM CDT	River Flood Warning	FWD	Hunt	8 hr
Aug 18, 2:57 PM CDT	Special Weather Statement	FWD	Anderson	33 min
Aug 18, 3:51 PM CDT	Special Weather Statement	FWD	Freestone	39 min
Aug 18, 4:26 PM CDT	Flash Flood Warning	FWD	Somervell	3 hr
Aug 18, 5:11 PM CDT	Areal Flood Advisory	FWD	McLennan	2 hr
Aug 18, 6:39 PM CDT	Areal Flood Advisory	FWD	Bosque, Somervell	3 hr

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.