Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 74, NWS Houston/Galveston, TX

May 21, 2001Chambers County, Harris County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 21, 2001, 3:58 PM CDT for Chambers County, Harris County, Texas. It was in force for 47 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 21, 2001, 3:58 PM CDT (20:58 UTC)
Expired: May 21, 2001, 4:45 PM CDT
In force: 47 min
Issued by: NWS Houston/Galveston, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Chambers County, TX, Harris County, TX

The radar

The Houston radar (KHGX), 35 km from the middle of the area, began a volume at 21:00 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.

Issued	Product	Office	Lasted
May 21, 3:45 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 9.0 hours before the alert went out and 180 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1654 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 653 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 May 21, 3:44 PM CDT, 14 minutes earlier.

Area forecast discussion, May 21, 3:44 PM CDT, 14 minutes before

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In the hours before

Special weather statement, May 21, 3:05 PM CDT, 53 minutes before

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Special weather statement, May 21, 3:25 PM CDT, 33 minutes before

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  <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 Houston/Galveston, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 20, 10:31 PM CDT	Severe Thunderstorm Warning	HGX	Burleson	29 min
May 20, 11:04 PM CDT	Severe Thunderstorm Warning	HGX	Brazos, Burleson, Grimes	56 min
May 21, 2:46 PM CDT	Severe Thunderstorm Warning	HGX	Harris	59 min

Nearby

Severe Thunderstorm Warnings in Texas, 2001 Every severe thunderstorm warning in 2001

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.