Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS Fort Worth, TX

April 29, 2021Ellis County, Johnson County, Texas

NWS Fort Worth, TX issued this flash flood warning at Apr 29, 2021, 1:32 AM CDT for Ellis County, Johnson County, 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 29, 2021, 1:32 AM CDT (06:32 UTC)
Expired: Apr 29, 2021, 5:00 AM CDT
In force: 3 hr
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Flood severity: None

Counties Ellis County, TX, Johnson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 30 km from the middle of the area, began a volume at 06:33 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 00:00Z, 6.5 hours before the alert went out and 53 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: 1526 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 1058 m above ground
0-6 km bulk shear: 73 kt
0-1 km storm-relative helicity: 191 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 9.4

Open this sounding in Storm Lab

The text

As transmitted.

830 
WGUS54 KFWD 290632
FFWFWD
TXC139-251-290800-
/O.NEW.KFWD.FF.W.0001.210429T0632Z-210429T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Fort Worth TX
132 AM CDT Thu Apr 29 2021

The National Weather Service in Fort Worth has issued a

* Flash Flood Warning for...
  Northwestern Ellis County in north central Texas...
  Southeastern Johnson County in north central Texas...

* Until 300 AM CDT.

* At 132 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain in along FM 157 just south of Venus. Between 3 and 4 
  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
           poor drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Cedar Hill, Waxahachie, Midlothian, Alvarado, Ovilla, Venus, 
  Grandview and Maypearl.

Additional rainfall amounts of 2 to 3 inches are possible in the 
warned area.

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 3222 9729 3236 9725 3249 9704 3254 9699
      3254 9692 3251 9689 3239 9691 3229 9699

FLASH FLOOD...RADAR INDICATED

$$

Dunn

3 follow-up statements

739 
WGUS74 KFWD 290718
FFSFWD

Flash Flood Statement
National Weather Service Fort Worth TX
218 AM CDT Thu Apr 29 2021

TXC139-251-290800-
/O.CON.KFWD.FF.W.0001.000000T0000Z-210429T0800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ellis TX-Johnson TX-
218 AM CDT Thu Apr 29 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 3 AM CDT EARLY THIS 
MORNING FOR NORTHWESTERN ELLIS AND SOUTHEASTERN JOHNSON COUNTIES...

At 218 AM CDT, Doppler radar indicated thunderstorms producing heavy 
rain in between Venus and Maypearl. Between 4 and 5 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 poor
         drainage and low lying areas.

Some locations that will experience flash flooding include...
  Cedar Hill, Waxahachie, Midlothian, Alvarado, Ovilla, Venus, 
  Grandview and Maypearl.

Additional rainfall amounts of 1 to 2 inches are possible in the 
warned area.

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 3222 9729 3236 9725 3249 9704 3254 9699
      3254 9692 3251 9689 3239 9691 3229 9699

FLASH FLOOD...RADAR INDICATED

$$

Dunn

350 
WGUS54 KFWD 290744
FFWFWD
TXC139-251-291000-
/O.EXT.KFWD.FF.W.0001.000000T0000Z-210429T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Fort Worth TX
244 AM CDT Thu Apr 29 2021

The National Weather Service in Fort Worth has extended the

* Flash Flood Warning for...
  Northwestern Ellis County in north central Texas...
  Southeastern Johnson County in north central Texas...

* Until 500 AM CDT.

* At 244 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain between Venus and Maypearl. Between 4 and 6 inches of 
  rain have fallen with additional heavy rain expected to continue 
  for about the next hour. 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
           poor drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Cedar Hill, Waxahachie, Midlothian, Alvarado, Ovilla, Venus, 
  Grandview and Maypearl.

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 3222 9729 3236 9725 3249 9704 3254 9699
      3254 9692 3251 9689 3239 9691 3229 9699

FLASH FLOOD...RADAR INDICATED

$$

Bonnette

793 
WGUS74 KFWD 290959
FFSFWD

Flash Flood Statement
National Weather Service Fort Worth TX
459 AM CDT Thu Apr 29 2021

TXC139-251-291009-
/O.EXP.KFWD.FF.W.0001.000000T0000Z-210429T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Ellis TX-Johnson TX-
459 AM CDT Thu Apr 29 2021

...FLASH FLOOD WARNING HAS BEEN REPLACED WITH A FLOOD WARNING FOR 
JOHNSON, HOOD, AND ELLIS COUNTIES THROUGH 8 AM...

LAT...LON 3222 9729 3236 9725 3249 9704 3254 9699
      3254 9692 3251 9689 3239 9691 3229 9699

$$

Bonnette

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 7:08 PM CDT	Severe Thunderstorm Warning	FWD	Parker	52 min
Apr 28, 7:30 PM CDT	Severe Thunderstorm Warning	FWD	Comanche, Erath	31 min
Apr 28, 7:47 PM CDT	Severe Thunderstorm Warning	FWD	Tarrant	73 min
Apr 28, 8:10 PM CDT	Tornado Warning	FWD	Tarrant	33 min
Apr 28, 8:42 PM CDT	Severe Thunderstorm Warning	FWD	Denton	63 min
Apr 28, 9:06 PM CDT	Severe Thunderstorm Warning	FWD	Young	54 min
Apr 28, 9:16 PM CDT	Severe Thunderstorm Warning	FWD	Delta, Hopkins, Lamar	39 min
Apr 28, 9:20 PM CDT	Severe Thunderstorm Warning	FWD	Collin	55 min
Apr 28, 10:01 PM CDT	Severe Thunderstorm Warning	FWD	Comanche	59 min
Apr 28, 10:07 PM CDT	Severe Thunderstorm Warning	FWD	Mills	53 min
Apr 28, 10:50 PM CDT	Severe Thunderstorm Warning	FWD	Erath	55 min
Apr 29, 1:35 AM CDT	River Flood Warning	FWD	Ellis, Navarro	3 days
Apr 29, 3:09 AM CDT	Areal Flood Advisory	FWD	Dallas	111 min
Apr 29, 3:22 AM CDT	Areal Flood Advisory	FWD	Ellis	98 min
Apr 29, 4:59 AM CDT	Areal Flood Warning	FWD	Ellis, Hill, Johnson	3 hr
Apr 29, 5:41 AM CDT	River Flood Warning	FWD	Dallas	4 hr
Apr 29, 8:12 AM CDT	River Flood Warning	FWD	Collin	25 hr
Apr 29, 8:18 AM CDT	River Flood Warning	FWD	Collin	25 hr
Apr 29, 9:33 AM CDT	River Flood Warning	FWD	Delta, Hopkins	28 hr
Apr 29, 1:43 PM CDT	River Flood Warning	FWD	Denton	22 hr
Apr 29, 5:57 PM CDT	Special Weather Statement	FWD	Rains	33 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.