Alert archive / Texas / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 105, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Sep 29, 2011, 5:13 AM CDT for Chambers County, Galveston 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
- Sep 29, 2011, 5:13 AM CDT (10:13 UTC)
- Expired
- Sep 29, 2011, 6:00 AM CDT
- In force
- 47 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
Counties Chambers County, TX, Galveston County, TX
The radar
The Houston radar (KHGX), 33 km from the middle of the area, began a volume at 10:15 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
Lake Charles Mun, LA (KLCH), launched 00:00Z, 10.2 hours before the alert went out and 164 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.
- Mixed-layer CAPE
- 4118 J/kg
- Mixed-layer CIN
- -24 J/kg
- Mixed-layer LCL
- 1002 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 95 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.6
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 Sep 29, 4:34 AM CDT, 39 minutes earlier.
Area forecast discussion, Sep 29, 4:34 AM CDT, 39 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>
<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.
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</html>The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 29, 5:15 AM CDT | Special Marine Warning | HGX | 60 min | |
| Sep 29, 5:28 AM CDT | Special Marine Warning | HGX | 2 hr | |
| Sep 29, 6:08 AM CDT | Special Marine Warning | HGX | 97 min | |
| Sep 29, 7:34 AM CDT | Special Marine Warning | HGX | 116 min | |
| Sep 29, 2:35 PM CDT | Special Weather Statement | HGX | Austin | 40 min |
| Sep 29, 2:53 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Colorado | 37 min |
| Sep 29, 2:57 PM CDT | Special Weather Statement | HGX | San Jacinto | 63 min |
| Sep 29, 3:25 PM CDT | Severe Thunderstorm Warning | HGX | Montgomery, San Jacinto | 65 min |
| Sep 29, 3:31 PM CDT | Special Weather Statement | HGX | Harris | 59 min |
| Sep 29, 3:34 PM CDT | Special Weather Statement | HGX | Colorado | 56 min |
| Sep 29, 3:47 PM CDT | Special Weather Statement | HGX | Montgomery | 58 min |
| Sep 29, 3:53 PM CDT | Severe Thunderstorm Warning | HGX | Liberty | 52 min |
| Sep 29, 3:56 PM CDT | Severe Thunderstorm Warning | HGX | Fort Bend, Harris | 49 min |
| Sep 29, 4:11 PM CDT | Severe Thunderstorm Warning | HGX | Harris, Montgomery | 49 min |
| Sep 29, 4:23 PM CDT | Severe Thunderstorm Warning | HGX | Harris, Montgomery, Waller | 37 min |
| Sep 29, 4:32 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Fort Bend, Harris | 28 min |
| Sep 29, 4:38 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Grimes, Harris, Waller, Washington | 52 min |
| Sep 29, 4:41 PM CDT | Severe Thunderstorm Warning | HGX | Chambers, Harris, Liberty | 49 min |
| Sep 29, 4:42 PM CDT | Special Marine Warning | HGX | 93 min | |
| Sep 29, 5:00 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Fort Bend, Harris | 45 min |
| Sep 29, 5:03 PM CDT | Severe Thunderstorm Warning | HGX | Fort Bend, Harris, Montgomery, Waller | 42 min |
| Sep 29, 5:28 PM CDT | Severe Thunderstorm Warning | HGX | Chambers, Galveston, Harris, Liberty | 27 min |
| Sep 29, 5:34 PM CDT | Special Weather Statement | HGX | Austin | 41 min |
| Sep 29, 5:41 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Colorado, Fort Bend, Harris, Waller, Wharton | 40 min |
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.