Alert archive / Texas / Flash Flood Watches in 2017

Flash Flood Watch 4, NWS Fort Worth, TX

August 6, 201746 counties in Texas

NWS Fort Worth, TX issued this flash flood watch at Aug 6, 2017, 3:20 PM CDT for 46 counties in Texas. It took effect at Aug 6, 2017, 7:00 PM CDT. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued: Aug 6, 2017, 3:20 PM CDT (20:20 UTC)
In effect from: Aug 6, 2017, 7:00 PM CDT
Expired: Aug 7, 2017, 10:45 AM CDT
In force: 16 hr
Issued by: NWS Fort Worth, TX
Flood severity: None

All 46 counties

Anderson County, TX, Bell County, TX, Bosque County, TX, Collin County, TX, Comanche County, TX, Cooke County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Eastland County, TX, Ellis County, TX, Erath County, TX, Falls County, TX, Fannin County, TX, Freestone County, TX, Grayson County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hood County, TX, Hopkins County, TX, Hunt County, TX, Jack County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, McLennan County, TX, Milam County, TX, Mills County, TX, Montague County, TX, Navarro County, TX, Palo Pinto County, TX, Parker County, TX, Rains County, TX, Robertson County, TX, Rockwall County, TX, Somervell County, TX, Stephens County, TX, Tarrant County, TX, Van Zandt County, TX, Wise County, TX, Young County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 27 km from the middle of the area, began a volume at 20:24 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, 8.3 hours before the alert went out and 51 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: -176 J/kg
Mixed-layer LCL: 1191 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 255 m²/s²
0-3 km storm-relative helicity: 247 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Fort Worth, TX wrote its last area forecast discussion before this flash flood watch went out at Aug 6, 1:30 PM CDT, 1 hour 50 minutes earlier.

Area forecast discussion, Aug 6, 1:30 PM CDT, 1 hour 50 minutes before

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Hazardous weather outlook, Aug 6, 12:02 PM CDT, 3 hours 18 minutes before

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In the hours before

Special weather statement, Aug 6, 10:16 AM CDT, 5 hours 4 minutes before

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Special weather statement, Aug 6, 10:47 AM CDT, 4 hours 33 minutes before

Special Weather Statement
National Weather Service Fort Worth TX
1047 AM CDT SUN AUG 6 2017

TXZ094-061630-
Fannin TX-
1047 AM CDT SUN AUG 6 2017

...SIGNIFICANT WEATHER ADVISORY FOR FANNIN COUNTY UNTIL 1130 AM
CDT...

At 1047 AM CDT, Doppler radar was tracking a strong thunderstorm near
Dodd City, or near Bonham, moving east at 15 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Bonham, Honey Grove, Savoy, Ector, Dodd City, Ravenna, Bonham State
Park and Windom.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3379 9585 3346 9586 3353 9638 3372 9638
      3369 9636 3369 9634 3370 9632 3377 9629
      3377 9627 3375 9623 3375 9619 3377 9617
      3380 9616
TIME...MOT...LOC 1547Z 274DEG 13KT 3362 9611

Hernandez

Special weather statement, Aug 6, 11:53 AM CDT, 3 hours 27 minutes before

Special Weather Statement
National Weather Service Fort Worth TX
1153 AM CDT SUN AUG 6 2017

TXZ095-106-061745-
Lamar TX-Delta TX-
1153 AM CDT SUN AUG 6 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN LAMAR AND DELTA COUNTIES
UNTIL 1245 PM CDT...

At 1153 AM CDT, Doppler radar was tracking a strong thunderstorm 11
miles southwest of Paris, moving east at 20 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Paris, Cooper, Deport, Roxton, Pecan Gap and Toco.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3336 9533 3337 9537 3337 9545 3335 9548
      3335 9553 3336 9554 3335 9556 3336 9557
      3335 9560 3338 9586 3367 9585 3362 9531
      3338 9531
TIME...MOT...LOC 1653Z 279DEG 19KT 3355 9569

Hernandez

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 7:19 PM CDT	Special Weather Statement	FWD	Young	41 min
Aug 6, 7:35 AM CDT	Special Weather Statement	FWD	Lamar	40 min
Aug 6, 8:34 AM CDT	Special Weather Statement	FWD	Lamar	41 min
Aug 6, 9:15 AM CDT	Special Weather Statement	FWD	Lamar	45 min
Aug 6, 9:40 AM CDT	Areal Flood Advisory	FWD	Lamar	2 hr
Aug 6, 10:16 AM CDT	Special Weather Statement	FWD	Delta, Lamar	44 min
Aug 6, 10:22 AM CDT	Areal Flood Advisory	FWD	Fannin	3 hr
Aug 6, 10:47 AM CDT	Special Weather Statement	FWD	Fannin	43 min
Aug 6, 11:53 AM CDT	Special Weather Statement	FWD	Delta	52 min
Aug 6, 1:27 PM CDT	Areal Flood Advisory	FWD	Lamar	63 min
Aug 6, 2:59 PM CDT	Severe Thunderstorm Warning	FWD	Montague	46 min
Aug 6, 3:27 PM CDT	Special Weather Statement	FWD	Wise	33 min
Aug 6, 3:43 PM CDT	Severe Thunderstorm Warning	FWD	Jack, Wise	62 min
Aug 6, 3:45 PM CDT	Severe Thunderstorm Warning	FWD	Montague	60 min
Aug 6, 4:34 PM CDT	Areal Flood Advisory	FWD	Jack, Montague, Wise	3 hr
Aug 6, 4:43 PM CDT	Severe Thunderstorm Warning	FWD	Jack, Wise	62 min
Aug 6, 5:23 PM CDT	Special Weather Statement	FWD	Young	52 min
Aug 6, 5:44 PM CDT	Special Weather Statement	FWD	Wise	46 min
Aug 6, 6:07 PM CDT	Severe Thunderstorm Warning	FWD	Parker, Tarrant, Wise	68 min
Aug 6, 6:13 PM CDT	Special Weather Statement	FWD	Stephens	47 min
Aug 6, 6:38 PM CDT	Severe Thunderstorm Warning	FWD	Parker	52 min
Aug 6, 6:42 PM CDT	Special Weather Statement	FWD	Palo Pinto	48 min
Aug 6, 6:48 PM CDT	Areal Flood Advisory	FWD	Parker	3 hr
Aug 6, 6:55 PM CDT	Special Weather Statement	FWD	Stephens	35 min

Nearby

Flash Flood Watches in Texas, 2017 Every flash flood watch in 2017

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.