Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 6, NWS Corpus Christi, TX

April 17, 2009La Salle County, Texas

NWS Corpus Christi, TX issued this severe thunderstorm warning at Apr 17, 2009, 12:34 PM CDT for La Salle County, Texas. It was in force for 41 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: Apr 17, 2009, 12:34 PM CDT (17:34 UTC)
Expired: Apr 17, 2009, 1:15 PM CDT
In force: 41 min
Issued by: NWS Corpus Christi, TX
Area: Storm-based polygon

County La Salle County, TX

The radar

The Laughlin AFB radar (KDFX), 154 km from the middle of the area, began a volume at 17:34 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 12:00Z, 5.6 hours before the alert went out and 186 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: 2605 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 468 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 79 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.0

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 Corpus Christi, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 17, 10:09 AM CDT, 2 hours 25 minutes earlier.

Area forecast discussion, Apr 17, 10:09 AM CDT, 2 hours 25 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, Apr 17, 5:31 AM CDT, 7 hours 3 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
531 AM CDT FRI APR 17 2009

GMZ230-235-250-255-270-275-TXZ229>234-239>247-181045-
BAYS AND WATERWAYS FROM BAFFIN BAY TO PORT ARANSAS-
BAYS AND WATERWAYS FROM PORT ARANSAS TO PORT OCONNOR-
COASTAL WATERS BAFFIN BAY TO PORT ARANSAS OUT 20 NM-
COASTAL WATERS PORT ARANSAS TO MATAGORDA SHIP CHANNEL OUT 20 NM-
WATERS BAFFIN BAY TO PORT ARANSAS 20 TO 60 NM-
WATERS PORT ARANSAS TO MATAGORDA SHIP CHANNEL 20 TO 60 NM-
LA SALLE-MCMULLEN-LIVE OAK-BEE-GOLIAD-VICTORIA-WEBB-DUVAL-
JIM WELLS-KLEBERG-NUECES-SAN PATRICIO-ARANSAS-REFUGIO-CALHOUN-
531 AM CDT FRI APR 17 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH TEXAS AND THE MIDDLE
TEXAS COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP ACROSS
SOUTH TEXAS TODAY. SOME OF THESE STORMS MAY PRODUCE SMALL HAIL AND
GUSTY WINDS.

SMALL CRAFT ADVISORY CONDITIONS WILL ALSO CONTINUE OVER THE GULF
THROUGH THE LATE AFTERNOON HOURS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE ACROSS SOUTH TEXAS
SATURDAY. SOME OF THESE STORMS MAY PRODUCE SMALL HAIL AND GUSTY
WINDS...MAINLY NORTHEAST OF INTERSTATE 37.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY OR SATURDAY.

TM/MJG

In the hours before

Special weather statement, Apr 17, 10:36 AM CDT, 1 hour 58 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
1036 AM CDT FRI APR 17 2009

TXZ229-171630-
LA SALLE-
1036 AM CDT FRI APR 17 2009

...A STRONG THUNDERSTORM WAS AFFECTING LA SALLE COUNTY...

AT 1033 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 11 MILES EAST OF CATARINA...OR 13 MILES WEST OF
COTULLA...MOVING EAST AT 15 MPH.

SMALL HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS STORM.

TE

Special weather statement, Apr 17, 11:23 AM CDT, 1 hour 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
1123 AM CDT FRI APR 17 2009

TXZ229-171730-
LA SALLE-
1123 AM CDT FRI APR 17 2009

...A STRONG THUNDERSTORM WAS AFFECTING LA SALLE COUNTY...

AT 1123 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM NEAR COTULLA...MOVING EAST AT 10 MPH.

SMALL HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS STORM.

TE

Special weather statement, Apr 17, 12:26 PM CDT, 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
1226 PM CDT FRI APR 17 2009

TXZ229-230-171830-
LA SALLE-MCMULLEN-
1226 PM CDT FRI APR 17 2009

...A STRONG THUNDERSTORM WAS AFFECTING LA SALLE AND MCMULLEN
COUNTIES...

AT 1223 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 7 MILES NORTHWEST OF LOS ANGELES...OR 10 MILES
NORTHEAST OF COTULLA...MOVING EAST AT 30 MPH. THIS STORM IS EXPECTED
TO MOVE ACROSS THE NORTHERN PORTIONS OF MCMULLEN COUNTY AROUND 1 PM.
RAINFALL RATES OF 1 TO 2 INCHES CAN BE EXPECTED WITH THIS STORM.

SMALL HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS STORM.

TE

The office that day

Everything else NWS Corpus Christi, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 17, 1:18 PM CDT	Flash Flood Warning	CRP	La Salle	117 min
Apr 17, 2:20 PM CDT	Severe Thunderstorm Warning	CRP	Live Oak, McMullen	55 min
Apr 17, 3:12 PM CDT	Severe Thunderstorm Warning	CRP	Live Oak, McMullen	63 min
Apr 17, 3:39 PM CDT	Severe Thunderstorm Warning	CRP	Duval, Jim Wells, Live Oak, McMullen	66 min
Apr 17, 4:20 PM CDT	Severe Thunderstorm Warning	CRP	Duval, Jim Wells, Live Oak, McMullen	55 min
Apr 17, 5:08 PM CDT	Severe Thunderstorm Warning	CRP	Duval, Jim Wells, Kleberg, Nueces	52 min
Apr 17, 5:58 PM CDT	Severe Thunderstorm Warning	CRP	Jim Wells, Kleberg, Nueces	62 min
Apr 17, 6:33 PM CDT	Severe Thunderstorm Warning	CRP	Duval	57 min

Nearby

Severe Thunderstorm Warnings in Texas, 2009 Every 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.