Alert archive / Texas / Flash Flood Watches in 2020

Flash Flood Watch 4, NWS Fort Worth, TX

August 31, 202043 counties in Texas

NWS Fort Worth, TX issued this flash flood watch at Aug 31, 2020, 7:06 PM CDT for 43 counties in Texas. It was in force for 60 hr.

The area

The counties it named.

The facts

Issued
Aug 31, 2020, 7:06 PM CDT (00:06 UTC)
Expired
Sep 3, 2020, 7:00 AM CDT
In force
60 hr
Issued by
NWS Fort Worth, TX
Flood severity
None
All 43 counties

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, 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, 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), 16 km from the middle of the area, began a volume at 00:08 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, 0.1 hours before the alert went out and 41 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-pSkew-T log-p diagram, Fort Worth, TX at 00:00Z on 2020-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1092 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 00:00Z on 2020-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 91 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1092 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
2152 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
91 m²/s²
0-3 km storm-relative helicity
146 m²/s²
Significant tornado parameter
0.0
Supercell composite
7.1

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 31, 7:01 PM CDT, 5 minutes earlier.

Area forecast discussion, Aug 31, 7:01 PM CDT, 5 minutes before
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Hazardous weather outlook, Aug 31, 2:37 PM CDT, 4 hours 29 minutes before
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In the hours before

Special weather statement, Aug 31, 6:59 PM CDT, 7 minutes before
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  <link rel="stylesheet" href="index.css">
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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

IssuedProductOfficeCountiesLasted
Sep 1, 9:02 AM CDTAreal Flood AdvisoryFWDCooke, Fannin, Grayson, Montague3 hr
Sep 1, 11:23 AM CDTAreal Flood AdvisoryFWDCollin, Denton, Wise6 hr
Sep 1, 12:04 PM CDTAreal Flood AdvisoryFWDCooke, Grayson3 hr
Sep 1, 1:14 PM CDTFlash Flood WarningFWDCollin, Cooke, Denton, Grayson6 hr
Sep 1, 2:22 PM CDTSpecial Weather StatementFWDParker38 min
Sep 1, 2:36 PM CDTSpecial Weather StatementFWDEastland39 min
Sep 1, 2:50 PM CDTSpecial Weather StatementFWDYoung40 min
Sep 1, 2:58 PM CDTSevere Thunderstorm WarningFWDJack62 min
Sep 1, 3:03 PM CDTTornado WarningFWDJack25 min
Sep 1, 3:15 PM CDTSevere Thunderstorm WarningFWDJack, Palo Pinto, Young60 min
Sep 1, 3:33 PM CDTSevere Thunderstorm WarningFWDStephens, Young57 min
Sep 1, 3:54 PM CDTSevere Thunderstorm WarningFWDStephens36 min
Sep 1, 4:32 PM CDTAreal Flood AdvisoryFWDJack, Palo Pinto, Parker3 hr
Sep 1, 4:49 PM CDTFlash Flood WarningFWDDenton2 hr
Sep 1, 4:54 PM CDTRiver Flood WarningFWDDenton43 hr
Sep 1, 5:23 PM CDTAreal Flood AdvisoryFWDWise3 hr
Sep 1, 5:40 PM CDTSpecial Weather StatementFWDSomervell50 min
Sep 1, 6:05 PM CDTAreal Flood AdvisoryFWDTarrant3 hr
Sep 1, 6:19 PM CDTSpecial Weather StatementFWDJohnson56 min
Sep 1, 6:25 PM CDTSpecial Weather StatementFWDDallas65 min

Nearby

Flash Flood Watches in Texas, 2020Every flash flood watch in 2020

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.