Alert archive / Texas / Flash Flood Warnings in 2019

Flash Flood Warning 4, NWS Fort Worth, TX

April 30, 2019Denton County, Tarrant County, Texas

NWS Fort Worth, TX issued this flash flood warning at Apr 30, 2019, 6:26 PM CDT for Denton County, Tarrant 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: Apr 30, 2019, 6:26 PM CDT (23:26 UTC)
Expired: Apr 30, 2019, 9:30 PM CDT
In force: 3 hr
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Flood severity: None

Counties Denton County, TX, Tarrant County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 51 km from the middle of the area, began a volume at 23:28 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
Apr 30, 7:26 PM CDT	FLASH FLOOD	Argyle, TX	REPORTS OF SWIFTWATER RESCUES IN ARGYLE, SKYLINE DRIVE AT VALLEY VIEW COURT. SEVERAL HOMES FLOODED

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 11.4 hours before the alert went out and 23 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: 1278 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 701 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 237 m²/s²
0-3 km storm-relative helicity: 356 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 8.5

Open this sounding in Storm Lab

The text

As transmitted.

850 
WGUS54 KFWD 302326
FFWFWD
TXC121-439-010230-
/O.NEW.KFWD.FF.W.0004.190430T2326Z-190501T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Fort Worth TX
626 PM CDT Tue Apr 30 2019

The National Weather Service in Fort Worth has issued a

* Flash Flood Warning for...
  Southwestern Denton County in north central Texas...
  Northwestern Tarrant County in north central Texas...

* Until 930 PM CDT..

* At 626 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. This rainfall will lead to excessive water runoff
  and cause flash flooding. Low-lying areas are most vulnerable to
  rapidly rising water. Some low-water crossings may flood and become
  impassable.

* Some locations that will experience flooding include...
  Fort Worth, Denton, Flower Mound, Keller, Corinth, Saginaw, Trophy
  Club, Eagle Mountain, Roanoke, Pecan Acres, Argyle, Justin, Blue
  Mound, Northlake, Haslet, Bartonville, Corral City, Ponder, Newark
  and Westlake.

Additional rainfall amounts of one to two 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.

&&

LAT...LON 3320 9706 3283 9732 3283 9751 3299 9745
      3299 9740 3320 9739

$$

30

1 follow-up statement

073 
WGUS74 KFWD 010039
FFSFWD

Flash Flood Statement
National Weather Service Fort Worth TX
739 PM CDT Tue Apr 30 2019

TXC121-439-010230-
/O.CON.KFWD.FF.W.0004.000000T0000Z-190501T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Denton TX-Tarrant TX-
739 PM CDT Tue Apr 30 2019

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR
SOUTHWESTERN DENTON AND NORTHWESTERN TARRANT COUNTIES...

At 738 PM CDT, emergency management reported flash flooding in 
Argyle, where up to 4 feet of water was affecting parts of Skyline 
Drive. Flash flooding is continuing across southwest Denton County 
and northern Tarrant County.

Some locations that will experience flooding include...
Fort Worth, Denton, Flower Mound, Keller, Corinth, Saginaw, Trophy
Club, Eagle Mountain, Roanoke, Pecan Acres, Argyle, Justin, Blue
Mound, Northlake, Haslet, Bartonville, Corral City, Ponder, Newark
and Westlake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3320 9706 3283 9732 3283 9751 3299 9745
      3299 9740 3320 9739

$$

30

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 2:33 PM CDT	Flash Flood Watch	FWD	Collin, Cooke, Dallas, Delta, Denton, Ellis and 20 more	4 days
Apr 30, 2:56 PM CDT	Special Weather Statement	FWD	Stephens	34 min
Apr 30, 3:19 PM CDT	Special Weather Statement	FWD	Palo Pinto	26 min
Apr 30, 4:00 PM CDT	Special Weather Statement	FWD	Hood, Somervell	30 min
Apr 30, 4:05 PM CDT	Special Weather Statement	FWD	Jack	25 min
Apr 30, 4:11 PM CDT	Severe Thunderstorm Warning	FWD	Jack, Palo Pinto, Wise	37 min
Apr 30, 4:27 PM CDT	Special Weather Statement	FWD	Tarrant	33 min
Apr 30, 4:40 PM CDT	Special Weather Statement	FWD	Denton	35 min
Apr 30, 5:17 PM CDT	Special Weather Statement	FWD	Cooke	28 min
Apr 30, 5:17 PM CDT	Tornado Warning	FWD	Parker, Tarrant	43 min
Apr 30, 5:27 PM CDT	Severe Thunderstorm Warning	FWD	Cooke, Denton	63 min
Apr 30, 5:55 PM CDT	Tornado Warning	FWD	Denton, Tarrant, Wise	50 min
Apr 30, 6:36 PM CDT	Tornado Warning	FWD	Denton, Tarrant	24 min
Apr 30, 6:59 PM CDT	Tornado Warning	FWD	Denton	31 min

Nearby

Flash Flood Warnings in Texas, 2019 Every flash flood warning in 2019

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.