Alert archive / Texas / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 230, NWS Fort Worth, TX

August 17, 2014Collin County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at Aug 17, 2014, 6:25 AM CDT for Collin County, Texas. It was in force for 36 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
Aug 17, 2014, 6:25 AM CDT (11:25 UTC)
Expired
Aug 17, 2014, 7:01 AM CDT
In force
36 min
Issued by
NWS Fort Worth, TX
Area
Storm-based polygon

County Collin County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 97 km from the middle of the area, began a volume at 11:29 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, 11.4 hours before the alert went out and 78 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 2014-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 349 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 2014-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 114 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
349 J/kg
Mixed-layer CIN
-177 J/kg
Mixed-layer LCL
1921 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
114 m²/s²
0-3 km storm-relative helicity
151 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Aug 17, 3:46 AM CDT, 2 hours 39 minutes earlier.

Area forecast discussion, Aug 17, 3:46 AM CDT, 2 hours 39 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, Aug 17, 3:39 AM CDT, 2 hours 46 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FORT WORTH TX
339 AM CDT SUN AUG 17 2014

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-181200-
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-
339 AM CDT SUN AUG 17 2014

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH TEXAS.

.DAY ONE...TODAY AND TONIGHT.

THERE IS A CHANCE OF THUNDERSTORMS ACROSS THE REGION TODAY THROUGH
TONIGHT. THE BEST RAIN CHANCES WILL BE SOUTHEAST OF A LINE FROM
EASTLAND TO FORT WORTH TO BONHAM. LIGHTNING...PERIODS OF HEAVY
RAINFALL AND STRONG WINDS WILL BE THE MAIN HAZARDS BUT SOME
THUNDERSTORMS IN THE AFTERNOON AND EARLY EVENING HOURS WILL BE
CAPABLE OF PRODUCING DAMAGING DOWNBURST WINDS. IN
ADDITION...STRONG OUTFLOW WINDS WILL POSE A THREAT TO THOSE
INVOLVED IN OUTDOOR RECREATION ACTIVITIES...ESPECIALLY ON AREA
LAKES. AREAS THAT RECEIVE HEAVY RAINFALL COULD EXPERIENCE
LOCALIZED FLOODING PROBLEMS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

LOW THUNDERSTORM CHANCES WILL CONTINUE ALONG AND SOUTH OF
INTERSTATE 20 ON MONDAY. ISOLATED THUNDERSTORMS ARE POSSIBLE
TUESDAY AFTERNOON. ISOLATED SEVERE DOWNBURST WINDS...PERIODS OF
HEAVY RAINFALL AND FREQUENT LIGHTNING WILL REMAIN THE PRIMARY
HAZARDS...ESPECIALLY DURING THE AFTERNOON AND EVENING PERIODS.

.SPOTTER INFORMATION STATEMENT...

LIMITED SPOTTER ACTIVATION MAY BE REQUESTED THIS AFTERNOON THROUGH
THE EARLY EVENING HOURS.

82/JLD

In the hours before

Special weather statement, Aug 17, 5:53 AM CDT, 32 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
553 AM CDT SUN AUG 17 2014

TXZ104-171130-
COLLIN TX-
553 AM CDT SUN AUG 17 2014

...SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTH CENTRAL COLLIN COUNTY

AT 553 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 4 MILES WEST OF WYLIE...MOVING NORTHEAST AT 5
MPH.

CITIES IN THE PATH OF THIS STORM INCLUDE LUCAS...MURPHY...PARKER AND
WYLIE.

VERY HEAVY RAIN AND WIND GUSTS TO 40 MPH ARE LIKELY WITH THIS STORM.
THE HEAVY RAIN MAY RESULT IN THE FLOODING OF LOW LYING
AREAS...CREEKS...AND DITCHES.

LAT...LON 3318 9657 3302 9638 3298 9658 3305 9667
TIME...MOT...LOC 1053Z 232DEG 4KT 3305 9658

82/JLD
Special weather statement, Aug 17, 6:09 AM CDT, 16 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
609 AM CDT SUN AUG 17 2014

TXZ104-171145-
COLLIN TX-
609 AM CDT SUN AUG 17 2014

...SIGNIFICANT WEATHER ADVISORY FOR...
  NORTHWESTERN COLLIN COUNTY

AT 609 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM 6 MILES NORTHWEST OF MCKINNEY...MOVING NORTHEAST
AT 15 MPH.

CITIES IN THE PATH OF THIS STORM INCLUDE ALLEN...ANNA...CELINA...
FAIRVIEW...LOWRY CROSSING...MCKINNEY AND PROSPER.

VERY HEAVY RAIN AND WIND GUSTS TO 40 MPH ARE LIKELY WITH THIS STORM.

HEAVY RAINFALL MAY RESULT IN FLOODING OF LOW LYING AREAS SUCH AS
DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED
ROADS AS THEY MAY BE WASHED OUT.

LAT...LON 3340 9653 3339 9652 3320 9648 3308 9672
      3323 9681 3341 9683 3340 9656
TIME...MOT...LOC 1109Z 238DEG 15KT 3326 9672

82/JLD

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 16, 7:15 PM CDTAreal Flood AdvisoryFWDDelta, Hopkins, Lamar2 hr
Aug 17, 5:08 AM CDTAreal Flood AdvisoryFWDDenton, Wise97 min
Aug 17, 5:53 AM CDTSpecial Weather StatementFWDCollin37 min
Aug 17, 6:09 AM CDTSpecial Weather StatementFWDCollin36 min
Aug 17, 6:50 AM CDTAreal Flood AdvisoryFWDCollin55 min
Aug 17, 6:57 AM CDTFlash Flood WarningFWDCollin2 hr
Aug 17, 7:16 AM CDTSpecial Weather StatementFWDDallas59 min
Aug 17, 8:54 AM CDTAreal Flood AdvisoryFWDDenton2 hr
Aug 17, 9:01 AM CDTAreal Flood AdvisoryFWDDallas3 hr
Aug 17, 9:13 AM CDTFlash Flood WarningFWDDallas, Denton2 hr
Aug 17, 9:30 AM CDTFlash Flood WarningFWDEllis2 hr
Aug 17, 10:23 AM CDTAreal Flood AdvisoryFWDJohnson, Tarrant82 min
Aug 17, 2:18 PM CDTSevere Thunderstorm WarningFWDMcLennan57 min
Aug 17, 2:52 PM CDTAreal Flood AdvisoryFWDMcLennan83 min
Aug 17, 4:51 PM CDTAreal Flood AdvisoryFWDBell, Coryell, Lampasas114 min

Nearby

Severe Thunderstorm Warnings in Texas, 2014Every severe thunderstorm warning in 2014

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.