Alert archive / Texas / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 218, NWS Fort Worth, TX

May 18, 2015Grayson County, Texas

NWS Fort Worth, TX issued this severe thunderstorm warning at May 18, 2015, 3:45 PM CDT for Grayson County, Texas. It was in force for 45 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
May 18, 2015, 3:45 PM CDT (20:45 UTC)
Expired
May 18, 2015, 4:30 PM CDT
In force
45 min
Issued by
NWS Fort Worth, TX
Area
Storm-based polygon
Hail
0.88 in
Wind
60.0 mph

County Grayson County, TX

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 8.8 hours before the alert went out and 301 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, Shreveport, LA at 12:00Z on 2015-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 840 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, Shreveport, LA at 12:00Z on 2015-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 86 square meters per square second.193958Sfc1 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
840 J/kg
Mixed-layer CIN
-50 J/kg
Mixed-layer LCL
899 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
86 m²/s²
0-3 km storm-relative helicity
105 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.6

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 May 18, 3:34 PM CDT, 11 minutes earlier.

Area forecast discussion, May 18, 3:34 PM CDT, 11 minutes before
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Hazardous weather outlook, May 18, 3:20 PM CDT, 25 minutes before
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In the hours before

Special weather statement, May 18, 3:19 PM CDT, 26 minutes before
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<head>
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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
May 17, 7:05 PM CDTAreal Flood WarningFWDEllis12 hr
May 18, 6:51 AM CDTRiver Flood WarningFWDWise20 hr
May 18, 7:56 AM CDTAreal Flood AdvisoryFWDLeon, Robertson3 hr
May 18, 10:32 AM CDTRiver Flood WarningFWDDelta, Hopkins14 days
May 18, 3:19 PM CDTSpecial Weather StatementFWDBosque41 min
May 18, 3:59 PM CDTSpecial Weather StatementFWDBosque46 min
May 18, 4:13 PM CDTAreal Flood AdvisoryFWDRobertson2 hr
May 18, 4:15 PM CDTSpecial Weather StatementFWDRobertson45 min
May 18, 4:37 PM CDTSpecial Weather StatementFWDSomervell38 min
May 18, 4:46 PM CDTAreal Flood AdvisoryFWDFreestone, Limestone119 min
May 18, 4:50 PM CDTSevere Thunderstorm WarningFWDBosque, Erath, Somervell40 min
May 18, 4:56 PM CDTSpecial Weather StatementFWDFreestone, Limestone49 min
May 18, 5:05 PM CDTSevere Thunderstorm WarningFWDLampasas28 min
May 18, 5:16 PM CDTSpecial Weather StatementFWDCoryell44 min
May 18, 5:47 PM CDTSpecial Weather StatementFWDLimestone43 min
May 18, 6:05 PM CDTSpecial Weather StatementFWDMills40 min
May 18, 6:34 PM CDTSpecial Weather StatementFWDMcLennan41 min
May 18, 6:42 PM CDTAreal Flood AdvisoryFWDBell, Coryell, Falls, McLennan2 hr
May 18, 6:57 PM CDTSevere Thunderstorm WarningFWDBell, Coryell, Falls, McLennan48 min

Nearby

Severe Thunderstorm Warnings in Texas, 2015Every severe thunderstorm warning in 2015

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.