Alert archive / Texas / Flash Flood Warnings in 2021

Flash Flood Warning 5, NWS Fort Worth, TX

May 24, 2021Johnson County, Texas

NWS Fort Worth, TX issued this flash flood warning at May 24, 2021, 7:08 PM CDT for Johnson County, Texas. It was in force for 3 hr. 1 report 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: May 24, 2021, 7:08 PM CDT (00:08 UTC)
Expired: May 24, 2021, 10:15 PM CDT
In force: 3 hr
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Flood severity: None

County Johnson County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 25 km from the middle of the area, began a volume at 00:12 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.

What was reported inside it

Time	Report	Where	Remark
May 24, 8:30 PM CDT	FLASH FLOOD	6 Sse Rendon, TX	DELAYED REPORT FROM YESTERDAY COUNTY EM REPORTS NUMEROUS ROADS UNDERWATER IN THE NORTHEASTERN PORTIONS OF THE COUNTY. AT LEAST 3 WATER RESCUES HAD BEEN CONDUCTED ALREADY.

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 00:00Z, 0.1 hours before the alert went out and 328 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: 96 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 867 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

750 
WGUS54 KFWD 250008
FFWFWD
TXC251-250315-
/O.NEW.KFWD.FF.W.0005.210525T0008Z-210525T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Fort Worth TX
708 PM CDT Mon May 24 2021

The National Weather Service in Fort Worth has issued a

* Flash Flood Warning for...
  Eastern Johnson County in north central Texas...

* Until 1015 PM CDT.

* At 708 PM CDT, emergency management reported flooding across the 
  northeastern parts of the county. Several roads have become 
  impassable due to flood water. Between 2 and 3 inches of rain have 
  fallen with up to 1 to 2 inches of additioanl rain possible.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Emergency management.

  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...
  Mansfield, Burleson, Cleburne, Keene, Joshua, Alvarado, Venus, 
  Grandview, Cross Timber and Briaroaks.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3221 9733 3254 9738 3254 9709 3227 9709

FLASH FLOOD...OBSERVED

$$

Bonnette

1 follow-up statement

288 
WGUS74 KFWD 250149
FFSFWD

Flash Flood Statement
National Weather Service Fort Worth TX
849 PM CDT Mon May 24 2021

TXC251-250315-
/O.CON.KFWD.FF.W.0005.000000T0000Z-210525T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Johnson TX-
849 PM CDT Mon May 24 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT THIS 
EVENING FOR EASTERN JOHNSON COUNTY...

At 849 PM CDT, emergency management reported flooding due to earlier 
thunderstorms producing heavy rain across the warned area. Between 3 
and 4 inches of rain fell earlier this evening. Flash flooding is 
likely ongoing.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Emergency management.

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...
  Mansfield, Burleson, Cleburne, Keene, Joshua, Alvarado, Venus, 
  Grandview, Cross Timber and Briaroaks.

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 3221 9733 3254 9738 3254 9709 3227 9709

FLASH FLOOD...OBSERVED

$$

JLDunn

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 1:34 AM CDT	Areal Flood Advisory	FWD	Grayson	3 hr
May 25, 4:23 AM CDT	River Flood Warning	FWD	Johnson, Tarrant	11 hr
May 25, 8:40 AM CDT	Areal Flood Advisory	FWD	Parker	2 hr
May 25, 9:24 AM CDT	River Flood Warning	FWD	Collin	34 hr
May 25, 9:26 AM CDT	Areal Flood Advisory	FWD	Tarrant	2 hr
May 25, 10:03 AM CDT	River Flood Warning	FWD	Hunt	22 hr
May 25, 10:26 AM CDT	River Flood Warning	FWD	Parker	16 hr
May 25, 11:27 AM CDT	Special Weather Statement	FWD	Kaufman	18 min
May 25, 11:41 AM CDT	Special Weather Statement	FWD	Navarro	34 min
May 25, 11:45 AM CDT	Special Weather Statement	FWD	Rockwall	30 min
May 25, 11:46 AM CDT	River Flood Warning	FWD	Dallas	47 hr
May 25, 11:56 AM CDT	Areal Flood Advisory	FWD	Grayson	2 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.