Alert archive / Texas / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 59, NWS Houston/Galveston, TX

April 18, 2019Houston County, Trinity County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 18, 2019, 2:42 AM CDT for Houston County, Trinity County, Texas. It was in force for 48 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
Apr 18, 2019, 2:42 AM CDT (07:42 UTC)
Expired
Apr 18, 2019, 3:30 AM CDT
In force
48 min
Issued by
NWS Houston/Galveston, TX
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Houston County, TX, Trinity County, TX

The radar

The Houston radar (KHGX), 193 km from the middle of the area, began a volume at 07:43 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 18, 1:09 AM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 7.7 hours before the alert went out and 232 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, Lake Charles Mun, LA at 00:00Z on 2019-04-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 553 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, Lake Charles Mun, LA at 00:00Z on 2019-04-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 195 square meters per square second.19395878Sfc1 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
553 J/kg
Mixed-layer CIN
-209 J/kg
Mixed-layer LCL
597 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
195 m²/s²
0-3 km storm-relative helicity
210 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.2

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 Houston/Galveston, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 18, 1:17 AM CDT, 1 hour 25 minutes earlier.

Area forecast discussion, Apr 18, 1:17 AM CDT, 1 hour 25 minutes before
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Hazardous weather outlook, Apr 17, 8:45 PM CDT, 5 hours 57 minutes before
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In the hours before

Special weather statement, Apr 18, 1:01 AM CDT, 1 hour 41 minutes before
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Local storm report, Apr 18, 1:16 AM CDT, 1 hour 26 minutes before
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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>
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Local storm report, Apr 18, 1:36 AM CDT, 1 hour 6 minutes before
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  <main class="wrap">
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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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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 Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 18, 12:56 AM CDTSevere Thunderstorm WarningHGXBrazos, Burleson34 min
Apr 18, 1:01 AM CDTSpecial Weather StatementHGXBurleson, Washington44 min
Apr 18, 1:25 AM CDTSevere Thunderstorm WarningHGXAustin, Brazos, Burleson, Waller, Washington50 min
Apr 18, 1:32 AM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Grimes, Madison, Walker43 min
Apr 18, 2:02 AM CDTSevere Thunderstorm WarningHGXHouston, Madison43 min
Apr 18, 2:13 AM CDTSevere Thunderstorm WarningHGXBrazos, Burleson, Grimes, Waller, Washington47 min
Apr 18, 2:17 AM CDTSevere Thunderstorm WarningHGXBrazos, Grimes, Houston, Madison, Walker43 min
Apr 18, 2:31 AM CDTAreal Flood AdvisoryHGXBrazos, Burleson, Grimes, Madison119 min
Apr 18, 2:56 AM CDTSevere Thunderstorm WarningHGXMadison, Trinity, Walker49 min
Apr 18, 3:10 AM CDTSpecial Weather StatementHGXColorado35 min
Apr 18, 3:22 AM CDTSpecial Weather StatementHGXPolk, Trinity38 min
Apr 18, 3:35 AM CDTSpecial Weather StatementHGXMontgomery, San Jacinto, Waller40 min
Apr 18, 3:42 AM CDTSpecial Weather StatementHGXWharton33 min
Apr 18, 3:54 AM CDTSpecial Weather StatementHGXPolk, Trinity66 min
Apr 18, 4:13 AM CDTSpecial Weather StatementHGXBrazoria, Chambers, Fort Bend, Galveston, Harris, Liberty and 1 more62 min
Apr 18, 4:19 AM CDTSpecial Marine WarningHGX86 min
Apr 18, 5:17 AM CDTSpecial Weather StatementHGXLiberty28 min
Apr 18, 5:19 AM CDTSevere Thunderstorm WarningHGXLiberty26 min
Apr 18, 6:38 AM CDTRiver Flood WarningHGXBrazos, Grimes, Madison5 days
Apr 18, 7:17 AM CDTRip Current StatementHGXBrazoria, Galveston, Matagorda5 hr
Apr 18, 7:37 AM CDTSpecial Marine WarningHGX98 min
Apr 18, 8:56 AM CDTSpecial Marine WarningHGX94 min
Apr 18, 10:23 AM CDTSpecial Marine WarningHGX52 min
Apr 18, 10:25 AM CDTSpecial Weather StatementHGXChambers20 min
Apr 18, 11:07 AM CDTSpecial Marine WarningHGX8 min

Nearby

Severe Thunderstorm Warnings in Texas, 2019Every severe thunderstorm warning in 2019

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.