Alert archive / Texas / Freeze Warnings in 2009

Freeze Warning 1, NWS Austin/San Antonio, TX

March 28, 200927 counties in Texas

NWS Austin/San Antonio, TX issued this freeze warning at Mar 28, 2009, 5:20 AM CDT for 27 counties in Texas. It took effect at Mar 29, 2009, 2:00 AM CDT. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Mar 28, 2009, 5:20 AM CDT (10:20 UTC)
In effect from
Mar 29, 2009, 2:00 AM CDT
Expired
Mar 29, 2009, 9:00 AM CDT
In force
7 hr
Issued by
NWS Austin/San Antonio, TX
All 27 counties

Atascosa County, TX, Bandera County, TX, Bastrop County, TX, Bexar County, TX, Blanco County, TX, Burnet County, TX, Caldwell County, TX, Comal County, TX, Edwards County, TX, Fayette County, TX, Frio County, TX, Gillespie County, TX, Gonzales County, TX, Guadalupe County, TX, Hays County, TX, Kendall County, TX, Kerr County, TX, Kinney County, TX, Lee County, TX, Llano County, TX, Medina County, TX, Real County, TX, Travis County, TX, Uvalde County, TX, Val Verde County, TX, Williamson County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 58 km from the middle of the area, began a volume at 10:20 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

Corpus Christi, TX (KCRP), launched 00:00Z, 10.3 hours before the alert went out and 266 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, Corpus Christi, TX at 00:00Z on 2009-03-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Corpus Christi, TX at 00:00Z on 2009-03-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -20 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
5953 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
-20 m²/s²
0-3 km storm-relative helicity
183 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze 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 freeze warning went out at Mar 28, 5:01 AM CDT, 19 minutes earlier.

Area forecast discussion, Mar 28, 5:01 AM CDT, 19 minutes before
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Hazardous weather outlook, Mar 27, 10:08 PM CDT, 7 hours 12 minutes before
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In the hours before

Special weather statement, Mar 28, 12:49 AM CDT, 4 hours 31 minutes before
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Special weather statement, Mar 28, 4:41 AM CDT, 39 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Mar 28, 4:28 AM CDTWind AdvisoryEWXBastrop, Blanco, Burnet, Caldwell, Comal, Fayette and 10 more11 hr
Mar 28, 3:41 PM CDTRed Flag WarningEWXAtascosa, Bandera, Bexar, Blanco, Burnet, Comal and 18 more29 hr

Nearby

Freeze Warnings in Texas, 2009Every freeze 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.