Alert archive / Texas / Flash Flood Warnings in 2008

Flash Flood Warning 21, NWS Fort Worth, TX

April 17, 2008Dallas County, Texas

NWS Fort Worth, TX issued this flash flood warning at Apr 17, 2008, 9:04 PM CDT for Dallas County, Texas. It was in force for 116 min. 2 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: Apr 17, 2008, 9:04 PM CDT (02:04 UTC)
Expired: Apr 17, 2008, 11:00 PM CDT
In force: 116 min
Issued by: NWS Fort Worth, TX
Area: Storm-based polygon
Flood severity: None

County Dallas County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 44 km from the middle of the area, began a volume at 02:04 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 17, 9:14 PM CDT	FLASH FLOOD	Irving, TX	HIGH WATER RESCUE AT IRVING MALL
Apr 17, 9:44 PM CDT	FLASH FLOOD	Dallas, TX	OAK LAWN AND NORTH STIMMONS FWY 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 00:00Z, 2.1 hours before the alert went out and 43 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: 822 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 1439 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 234 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 6.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS54 KFWD 180205
FFWFWD
TXC113-180400-
/O.NEW.KFWD.FF.W.0021.080418T0204Z-080418T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE FORT WORTH TX
904 PM CDT THU APR 17 2008

THE NATIONAL WEATHER SERVICE IN FORT WORTH HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DALLAS COUNTY IN NORTH CENTRAL TEXAS

* UNTIL 1100 PM CDT

* AT 904 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED   
  THUNDERSTORMS WITH HEAVY RAIN ACROSS DALLAS COUNTY...MOVING        
  NORTHEAST AT 25 MPH. RAINFALL AMOUNTS IN EXCESS OF 2 INCHES WILL   
  BE POSSIBLE WITH THESE STORMS IN A VERY SHORT PERIOD OF            
  TIME...WHICH WILL LIKELY CAUSE URBAN FLASH FLOODING.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLASH FLOODS. IT IS VERY DIFFICULT AT NIGHT TO TELL HOW 
MUCH WATER IS ON THE ROADS. IT ONLY TAKES TWO FEET OF RUSHING WATER 
TO CARRY AWAY MOST SPORT UTILITY VEHICLES AND PICKUPS. MOTORISTS 
SHOULD NOT DRIVE THROUGH WATER OF UNKNOWN DEPTH. TAKE A DIFFERENT 
ROUTE TO REACH YOUR DESTINATION OR WAIT UNTIL THE WATER RECEDES.

LAT...LON 3257 9703 3299 9704 3299 9652 3255 9652
      3255 9702
TIME...MOT...LOC 0204Z 244DEG 21KT 3274 9691

$$

DUNN

2 follow-up statements

000 
WGUS74 KFWD 180237
FFSFWD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
936 PM CDT THU APR 17 2008

TXC113-180400-
/O.CON.KFWD.FF.W.0021.000000T0000Z-080418T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DALLAS TX-
936 PM CDT THU APR 17 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT FOR
DALLAS COUNTY...

* AT 936 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
  THUNDERSTORMS WITH HEAVY RAIN 2 MILES NORTHEAST OF DALLAS...MOVING
  NORTHEAST AT 24 MPH. RADAR INDICATES THAT 1 TO 2 INCHES OF RAIN HAS
  ALREADY FALLEN. ANOTHER 1 TO 2 INCHES WILL BE POSSIBLE THROUGH 1100
  PM CDT.

SOME LOCATIONS THAT WILL CONTINUE TO BE AFFECTED BY HEAVY RAIN
INCLUDE BALCH SPRINGS...SEAGOVILLE...MESQUITE...RICHARDSON...
GARLAND...SUNNYVALE...ROWLETT AND SACHSE.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLASH FLOODS. IT IS VERY DIFFICULT AT NIGHT TO TELL HOW
MUCH WATER IS ON THE ROADS. IT ONLY TAKES TWO FEET OF RUSHING WATER
TO CARRY AWAY MOST SPORT UTILITY VEHICLES AND PICKUPS. MOTORISTS
SHOULD NOT DRIVE THROUGH WATER OF UNKNOWN DEPTH. TAKE A DIFFERENT
ROUTE TO REACH YOUR DESTINATION OR WAIT UNTIL THE WATER RECEDES.

LAT...LON 3257 9703 3299 9704 3299 9652 3255 9652
      3255 9702
TIME...MOT...LOC 0236Z 244DEG 21KT 3282 9671

$$


77/TLD

000 
WGUS74 KFWD 180353
FFSFWD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
1053 PM CDT THU APR 17 2008

TXC113-180403-
/O.EXP.KFWD.FF.W.0021.000000T0000Z-080418T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DALLAS TX-
1053 PM CDT THU APR 17 2008

...THE FLASH FLOOD WARNING FOR DALLAS COUNTY EXPIRES AT 1100 PM
CDT...

THE HEAVY RAINFALL HAS ENDED ACROSS THE WARNED AREA...THEREFORE THE
FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE.

A FEW FLOOD PRONE AREAS MAY TAKE LONGER TO DRAIN...CONTINUE TO DRIVE 
WITH CAUTION.

TO REPORT PREVIOUS FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
FORT WORTH.

LAT...LON 3257 9703 3299 9704 3299 9652 3255 9652
      3255 9702
TIME...MOT...LOC 0353Z 244DEG 21KT 379 14910

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 17, 7:01 PM CDT	Special Weather Statement	FWD	Hood	29 min
Apr 17, 7:20 PM CDT	Severe Thunderstorm Warning	FWD	Tarrant	55 min
Apr 17, 7:38 PM CDT	Severe Thunderstorm Warning	FWD	Hood	37 min
Apr 17, 7:42 PM CDT	Severe Thunderstorm Warning	FWD	Parker	48 min
Apr 17, 7:45 PM CDT	Special Weather Statement	FWD	Johnson	30 min
Apr 17, 7:45 PM CDT	Severe Thunderstorm Warning	FWD	Cooke, Denton	45 min
Apr 17, 8:09 PM CDT	Severe Thunderstorm Warning	FWD	Tarrant	66 min
Apr 17, 8:11 PM CDT	Severe Thunderstorm Warning	FWD	Erath, Hood, Somervell	64 min
Apr 17, 8:12 PM CDT	Flash Flood Warning	FWD	Tarrant	2 hr
Apr 17, 8:16 PM CDT	Severe Thunderstorm Warning	FWD	Johnson	44 min
Apr 17, 8:20 PM CDT	Special Weather Statement	FWD	Dallas	25 min
Apr 17, 8:30 PM CDT	Special Weather Statement	FWD	Hamilton, Mills	30 min
Apr 17, 8:30 PM CDT	Severe Thunderstorm Warning	FWD	Dallas	60 min
Apr 17, 8:34 PM CDT	Severe Thunderstorm Warning	FWD	Hamilton, Mills	56 min
Apr 17, 8:41 PM CDT	Special Weather Statement	FWD	Ellis	34 min
Apr 17, 8:47 PM CDT	Severe Thunderstorm Warning	FWD	Johnson	43 min
Apr 17, 8:52 PM CDT	Severe Thunderstorm Warning	FWD	Ellis	53 min
Apr 17, 9:14 PM CDT	Severe Thunderstorm Warning	FWD	Lampasas	61 min
Apr 17, 9:19 PM CDT	Severe Thunderstorm Warning	FWD	Collin, Dallas, Rockwall	56 min
Apr 17, 9:26 PM CDT	Severe Thunderstorm Warning	FWD	Coryell	64 min
Apr 17, 9:42 PM CDT	Flash Flood Warning	FWD	Ellis	2 hr
Apr 17, 9:44 PM CDT	Severe Thunderstorm Warning	FWD	Ellis	61 min
Apr 17, 9:59 PM CDT	Severe Thunderstorm Warning	FWD	Kaufman	61 min
Apr 17, 10:03 PM CDT	Special Weather Statement	FWD	Fannin, Hunt	27 min
Apr 17, 10:11 PM CDT	Special Weather Statement	FWD	McLennan	34 min
Apr 17, 10:18 PM CDT	Special Weather Statement	FWD	Hill	27 min
Apr 17, 10:32 PM CDT	Flash Flood Warning	FWD	Kaufman	118 min
Apr 17, 10:32 PM CDT	Special Weather Statement	FWD	Navarro	58 min
Apr 17, 10:46 PM CDT	Special Weather Statement	FWD	McLennan	29 min
Apr 17, 10:50 PM CDT	Special Weather Statement	FWD	Henderson	85 min
Apr 17, 11:03 PM CDT	Special Weather Statement	FWD	Bell	27 min
Apr 17, 11:22 PM CDT	Special Weather Statement	FWD	Bell	53 min
Apr 17, 11:42 PM CDT	Severe Thunderstorm Warning	FWD	Bell, Milam	48 min
Apr 18, 12:13 AM CDT	Special Weather Statement	FWD	Henderson, Van Zandt	37 min
Apr 18, 12:42 AM CDT	Special Weather Statement	FWD	Anderson	33 min
Apr 18, 12:44 AM CDT	Special Weather Statement	FWD	Robertson	31 min
Apr 18, 1:05 AM CDT	Special Weather Statement	FWD	Anderson	25 min
Apr 18, 6:37 AM CDT	River Flood Warning	FWD	Collin	4 hr
Apr 18, 8:10 AM CDT	River Flood Warning	FWD	Hunt, Rockwall	6 hr
Apr 18, 9:31 AM CDT	River Flood Warning	FWD	Henderson, Navarro	12 hr
Apr 18, 2:45 PM CDT	River Flood Warning	FWD	Dallas	18 hr

Nearby

Flash Flood Warnings in Texas, 2008 Every flash flood warning in 2008

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.