Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 525, NWS Fort Worth, TX

September 29, 2011Hamilton County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Sep 29, 2011, 11:44 PM CDT for Hamilton County, Texas. It was in force for 37 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Sep 29, 2011, 11:44 PM CDT (04:44 UTC)
Expired
Sep 30, 2011, 12:21 AM CDT
In force
37 min
Issued by
NWS Fort Worth, TX
Area
Storm-based polygon

County Hamilton County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 123 km from the middle of the area, began a volume at 04:44 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, 4.7 hours before the alert went out and 147 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 2011-09-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1124 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 2011-09-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 19 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
1124 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
2883 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
19 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Sep 29, 11:11 PM CDT, 33 minutes earlier.

Area forecast discussion, Sep 29, 11:11 PM CDT, 33 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<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.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Hazardous weather outlook, Sep 29, 3:37 PM CDT, 8 hours 7 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FORT WORTH TX
337 PM CDT THU SEP 29 2011

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-301115-
MONTAGUE-COOKE-GRAYSON-FANNIN-LAMAR-YOUNG-JACK-WISE-DENTON-COLLIN-
HUNT-DELTA-HOPKINS-STEPHENS-PALO PINTO-PARKER-TARRANT-DALLAS-
ROCKWALL-KAUFMAN-VAN ZANDT-RAINS-EASTLAND-ERATH-HOOD-SOMERVELL-
JOHNSON-ELLIS-HENDERSON-COMANCHE-MILLS-HAMILTON-BOSQUE-HILL-NAVARRO-
FREESTONE-ANDERSON-LAMPASAS-CORYELL-BELL-MCLENNAN-FALLS-LIMESTONE-
LEON-MILAM-ROBERTSON-
337 PM CDT THU SEP 29 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...THROUGH TONIGHT.
THERE IS A SLIGHT CHANCE OF THUNDERSTORMS ACROSS ALL OF NORTH
TEXAS THROUGH TONIGHT. CLOUD TO GROUND LIGHTNING AND GUSTY WINDS
WILL BE THE PRIMARY HAZARDS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
GUSTY NORTHEASTERLY WINDS...LOW RELATIVE HUMIDITIES AND DRY GRASSES
AND BRUSH WILL COMBINE TO CREATE FIRE WEATHER PROBLEMS FRIDAY.

CRITICAL FIRE WEATHER CONDITIONS ARE EXPECTED FROM MID FRIDAY MORNING
TO MID FRIDAY AFTERNOON ALONG AND SOUTH OF A COMANCHE TO ATHENS LINE.
ELEVATED FIRE WEATHER CONDITIONS ARE EXPECTED FRIDAY ACROSS THE
REST OF NORTH TEXAS.

.SPOTTER INFORMATION STATEMENT...
LIMITED SPOTTER ACTIVATION MAY BE REQUESTED THROUGH THE EARLY
EVENING HOURS.

In the hours before

Local storm report, Sep 29, 10:28 PM CDT, 1 hour 16 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<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.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Special weather statement, Sep 29, 10:31 PM CDT, 1 hour 13 minutes before
<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<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.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Special weather statement, Sep 29, 10:34 PM CDT, 1 hour 10 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
1034 PM CDT THU SEP 29 2011

TXZ131-132-300400-
HOOD TX-SOMERVELL TX-
1034 PM CDT THU SEP 29 2011

...SIGNIFICANT WEATHER ADVISORY FOR...
  HOOD COUNTY
  SOMERVELL COUNTY

AT 1034 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 12 MILES SOUTHWEST OF GRANBURY...MOVING SOUTH AT
25 MPH.

CITIES IN THE PATH OF THIS STORM INCLUDE GLEN ROSE...GRANBURY AND
DINOSAUR VALLEY STATE PARK.

FREQUENT CLOUD TO GROUND LIGHTNING...VERY HEAVY RAINFALL...PEA-SIZED
HAIL...AND WIND GUSTS TO 50 MPH CAN BE EXPECTED FROM THIS STORM.

IF THIS STORM INTENSIFIES...A SEVERE WEATHER WARNING MAY BE NEEDED.

LAT...LON 3251 9806 3247 9762 3220 9761 3220 9765
      3209 9786 3223 9795 3248 9806
TIME...MOT...LOC 0334Z 351DEG 23KT 3229 9793

CAVANAUGH
Local storm report, Sep 29, 10:40 PM CDT, 1 hour 4 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
1040 PM CDT THU SEP 29 2011

..TIME..    ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE..    ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0912 PM     TSTM WND DMG     RIVER OAKS              32.78N  97.40W
09/29/2011                   TARRANT            TX   PUBLIC

            MULTIPLE TREES DOWN ON HOMES ON ROBERTS CUT OFF RD
Special weather statement, Sep 29, 10:41 PM CDT, 1 hour 3 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
1041 PM CDT THU SEP 29 2011

TXZ141-142-300415-
MILLS TX-COMANCHE TX-
1041 PM CDT THU SEP 29 2011

...SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTH CENTRAL COMANCHE COUNTY
  MILLS COUNTY

AT 1041 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 17 MILES SOUTH OF COMANCHE...MOVING SOUTH AT 25
MPH.

CITIES IN THE PATH OF THIS STORM INCLUDE GOLDTHWAITE AND MULLIN.

FREQUENT CLOUD TO GROUND LIGHTNING...VERY HEAVY RAINFALL...PEA-SIZED
HAIL...AND WIND GUSTS TO 50 MPH CAN BE EXPECTED FROM THIS STORM.

IF THIS STORM INTENSIFIES...A SEVERE WEATHER WARNING MAY BE NEEDED.

LAT...LON 3161 9879 3169 9875 3171 9868 3180 9873
      3185 9846 3175 9834 3168 9847 3141 9828
      3124 9856 3128 9862 3131 9861 3132 9866
      3136 9866 3136 9871 3140 9870 3141 9873
      3138 9875 3149 9895
TIME...MOT...LOC 0341Z 353DEG 22KT 3165 9860

CAVANAUGH
Special weather statement, Sep 29, 11:27 PM CDT, 17 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
1127 PM CDT THU SEP 29 2011

TXZ143-144-157-159-300530-
HAMILTON TX-MCLENNAN TX-BOSQUE TX-CORYELL TX-
1127 PM CDT THU SEP 29 2011

...SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTHERN BOSQUE COUNTY
  CORYELL COUNTY
  EASTERN HAMILTON COUNTY
  MCLENNAN COUNTY

AT 1127 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 19 MILES NORTH OF
HAMILTON TO 6 MILES SOUTHEAST OF CLIFTON TO 13 MILES NORTH OF
LACY-LAKEVIEW...MOVING SOUTH AT 25 MPH.  THESE STORMS ARE CAPABLE OF
PRODUCING 40 TO 50 MPH WIND GUSTS AND FREQUENT CLOUD TO GROUND
LIGHTNING.

CITIES IN THE PATH OF THESE STORMS INCLUDE BELLMEAD...BEVERLY
HILLS...BRUCEVILLE-EDDY...CLIFTON...CRANFILLS GAP...CRAWFORD...FORT
GATES...GATESVILLE...HAMILTON...HEWITT...HICO...IREDELL...
LACY-LAKEVIEW...LORENA...MCGREGOR...MOODY...NORTHCREST...ROBINSON...
VALLEY MILLS...WACO...WEST...WOODWAY...MERIDIAN STATE PARK AND MOTHER
NEFF STATE PARK.

LAT...LON 3196 9813 3203 9798 3182 9747 3184 9728
      3178 9732 3175 9728 3186 9704 3176 9697
      3140 9704 3128 9726 3127 9737 3132 9742
      3123 9760 3150 9822
TIME...MOT...LOC 0427Z 009DEG 23KT 3196 9803 3173 9749
          3180 9706

CAVANAUGH

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 29, 8:22 PM CDTSpecial Weather StatementFWDCollin, Denton38 min
Sep 29, 8:34 PM CDTSevere Thunderstorm WarningFWDDenton41 min
Sep 29, 8:52 PM CDTSevere Thunderstorm WarningFWDTarrant53 min
Sep 29, 9:12 PM CDTSevere Thunderstorm WarningFWDDallas63 min
Sep 29, 9:22 PM CDTSpecial Weather StatementFWDParker38 min
Sep 29, 9:39 PM CDTSevere Thunderstorm WarningFWDDallas, Ellis, Johnson, Tarrant66 min
Sep 29, 10:14 PM CDTSpecial Weather StatementFWDComanche, Mills31 min
Sep 29, 10:31 PM CDTSpecial Weather StatementFWDEllis, Hill, Navarro59 min
Sep 29, 10:34 PM CDTSpecial Weather StatementFWDHood, Somervell26 min
Sep 29, 10:41 PM CDTSpecial Weather StatementFWDMills34 min
Sep 29, 11:27 PM CDTSpecial Weather StatementFWDCoryell, Hamilton, McLennan63 min
Sep 30, 12:25 AM CDTSpecial Weather StatementFWDCoryell35 min
Sep 30, 12:42 AM CDTSpecial Weather StatementFWDBell63 min
Sep 30, 2:56 AM CDTRed Flag WarningFWDAnderson, Bell, Coryell, Falls, Freestone, Henderson and 7 more16 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2011Every severe thunderstorm warning in 2011

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.