Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 23, NWS San Angelo, TX

March 11, 2001Schleicher County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Mar 11, 2001, 6:45 PM CST for Schleicher County, Texas. It was in force for 30 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: Mar 11, 2001, 6:45 PM CST (00:45 UTC)
Expired: Mar 11, 2001, 7:15 PM CST
In force: 30 min
Issued by: NWS San Angelo, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Schleicher County, TX

The radar

The San Angelo radar (KSJT), 53 km from the middle of the area, began a volume at 00:45 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, 0.8 hours before the alert went out and 172 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: 1542 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1115 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 146 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.6

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 San Angelo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Mar 11, 2:29 PM CST, 4 hours 16 minutes earlier.

Area forecast discussion, Mar 11, 2:29 PM CST, 4 hours 16 minutes before

WEST CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
229 PM CST SUN MAR 11 2001

MAY NEED TO MENTION THUNDER IN THE FAR EASTERN ZONES THIS EVENING...AS
THE UPPER LEVEL TROUGH OVERRUNS THE DRYLINE. PER GOES SOUNDING...CAPES
1500-2000 J/KG WITH NO INHIBITION OVER WEST CENTRAL TEXAS AT THE MOMENT.
HOWEVER...MOISTURE RATHER SHALLOW AS 850 MB DEWPOINTS ONLY IN THE SINGLE
DIGITS CELCIUS. DEEPER MOISTURE CONFINED TO EASTERN TEXAS.

PROXIMITY TO UPPER CONFLUENT ZONE AND ASSOCIATED LARGE SCALE SINKING
MOTION TO RESULT IN BENIGN WEATHER CONDITIONS MONDAY AND TUESDAY. HIGH
PRESSURE ALSO DOMINATE IN LOW LEVELS...BLOCKING ANY MOISTURE INTRUSIONS
FROM THE GULF. MAIN CONCERN TEMPERATURES ON MONDAY...AS COOLER AIR FILTERS
INTO THE AREA. ETA BULLISH WITH COLD AIR ADVECTION...ESPECIALLY ACROSS
THE BIG COUNTRY. AVN/NGM NOT AS AGRESSIVE...WITH 70S ACROSS THE BOARD.
BASED ON CURRENT READINGS IN THE TEXAS PANHANDLE...HAVE DECIDED TO SPLIT
THE DIFFERENCE. INCREASING CLOUDS TUESDAY NIGHT AS GULF OPENS AHEAD OF
THE NEXT SYSTEM.

SPEAKING OF THAT NEXT SYSTEM...AVN TRACK FAVORABLE...TAKING UPPER LOW FROM
OZONA TO ABILENE ON WEDNESDAY. DEPTH OF MOISTURE IN QUESTION...HOWEVER.
NOT SURE IF GULF WILL BE OPEN FOR BUSINESS LONG ENOUGH TO ALLOW FOR
MEANINGFUL RAINFALL. TIME WILL TELL. ANOTHER SHORTWAVE TROUGH PROGD RIGHT
ON THE HEELS OF THE UPPER LOW FOR THURSDAY. MUCH COOLER FRIDAY AN8D SATURDAY
WITH LOWS IN THE 30S AND HIGHS IN THE 50S.

PRELIMS...

ABI 040/067/040/070 -000
SJT 043/070/039/073 -000
JCT 046/069/038/072 2000

.SJT...NONE.

17

In the hours before

Special weather statement, Mar 11, 2:06 PM CST, 4 hours 39 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 11, 7:52 PM CST	Severe Thunderstorm Warning	SJT	Menard	53 min
Mar 11, 8:16 PM CST	Severe Thunderstorm Warning	SJT	Brown	59 min
Mar 11, 8:35 PM CST	Severe Thunderstorm Warning	SJT	McCulloch	55 min
Mar 11, 10:28 PM CST	Severe Thunderstorm Warning	SJT	McCulloch	32 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.