Alert archive / Texas / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 61, NWS Austin/San Antonio, TX

May 15, 2010Gillespie County, Llano County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 15, 2010, 7:26 PM CDT for Gillespie County, Llano County, Texas. It was in force for 29 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 15, 2010, 7:26 PM CDT (00:26 UTC)
Expired: May 15, 2010, 7:55 PM CDT
In force: 29 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

Counties Gillespie County, TX, Llano County, TX

The radar

The Austin/San Antonio radar (KEWX), 117 km from the middle of the area, began a volume at 00:29 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

Del Rio, TX (KDRT), launched 00:00Z, 0.4 hours before the alert went out and 233 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: 2147 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1242 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: -8 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 0.7

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 Austin/San Antonio, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at May 15, 7:05 PM CDT, 21 minutes earlier.

Area forecast discussion, May 15, 7:05 PM CDT, 21 minutes before

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Hazardous weather outlook, May 15, 5:48 PM CDT, 1 hour 38 minutes before

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In the hours before

Local storm report, May 15, 1:26 PM CDT, 6 hours before

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Special weather statement, May 15, 6:02 PM CDT, 1 hour 24 minutes before

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Local storm report, May 15, 6:33 PM CDT, 53 minutes before

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Local storm report, May 15, 6:53 PM CDT, 33 minutes before

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Special weather statement, May 15, 7:03 PM CDT, 23 minutes before

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The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 15, 7:17 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie	43 min
May 16, 3:28 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	47 min
May 16, 4:14 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	46 min
May 16, 4:28 AM CDT	Flash Flood Warning	EWX	Val Verde	3 hr
May 16, 5:54 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	51 min
May 16, 6:05 AM CDT	Flash Flood Warning	EWX	Val Verde	3 hr
May 16, 7:25 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	50 min
May 16, 7:36 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	38 min
May 16, 9:17 AM CDT	Severe Thunderstorm Warning	EWX	Val Verde	43 min
May 16, 10:26 AM CDT	Flash Flood Warning	EWX	Val Verde	3 hr
May 16, 11:23 AM CDT	Areal Flood Advisory	EWX	Guadalupe	2 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2010 Every severe thunderstorm warning in 2010

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.