Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 232, NWS San Angelo, TX

September 21, 2009McCulloch County, San Saba County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Sep 21, 2009, 10:41 PM CDT for McCulloch County, San Saba County, Texas. It was in force for 49 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 21, 2009, 10:41 PM CDT (03:41 UTC)
Expired
Sep 21, 2009, 11:30 PM CDT
In force
49 min
Issued by
NWS San Angelo, TX
Area
Storm-based polygon

Counties McCulloch County, TX, San Saba County, TX

The radar

The San Angelo radar (KSJT), 136 km from the middle of the area, began a volume at 03:44 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

Fort Worth, TX (KFWD), launched 00:00Z, 3.7 hours before the alert went out and 250 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, Fort Worth, TX at 00:00Z on 2009-09-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2664 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, Fort Worth, TX at 00:00Z on 2009-09-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 102 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
2664 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1499 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
102 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS San Angelo, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 21, 7:25 PM CDTSevere Thunderstorm WarningSJTBrown50 min
Sep 21, 7:30 PM CDTAreal Flood AdvisorySJTColeman90 min
Sep 21, 7:41 PM CDTSevere Thunderstorm WarningSJTBrown64 min
Sep 22, 12:30 AM CDTAreal Flood AdvisorySJTConcho, McCulloch, San Saba3 hr
Sep 22, 12:47 AM CDTAreal Flood AdvisorySJTConcho, McCulloch, San Saba3 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2009Every severe thunderstorm warning in 2009

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.