Alert archive / Texas / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 69, NWS Houston/Galveston, TX

April 6, 2005Brazoria County, Matagorda County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 6, 2005, 2:34 AM CDT for Brazoria County, Matagorda County, Texas. It was in force for 43 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 6, 2005, 2:34 AM CDT (07:34 UTC)
Expired: Apr 6, 2005, 3:17 AM CDT
In force: 43 min
Issued by: NWS Houston/Galveston, TX
Area: Counties, with a storm outline in the text

Counties Brazoria County, TX, Matagorda County, TX

The radar

The Houston radar (KHGX), 83 km from the middle of the area, began a volume at 07:33 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, 7.6 hours before the alert went out and 211 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: 1351 J/kg
Mixed-layer CIN: -206 J/kg
Mixed-layer LCL: 956 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 115 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 Houston/Galveston, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 5, 8:25 PM CDT, 6 hours 9 minutes earlier.

Area forecast discussion, Apr 5, 8:25 PM CDT, 6 hours 9 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
825 PM CDT TUE APR 5 2005

.DISCUSSION...
CONVECTION HAS BUILT EVEN FURTHER SOUTH ACROSS CEN TX. SVR TSTM
WATCH HAS BEEN ISSUED FOR W PORTIONS OF SE TX UNTIL 4 AM. WILL RAISE
POPS FURTHER WITH THE NEXT UPDATE THAT WILL HAVE THE WATCH IN THE
ZONES. STILL SOME UNCERTAINTY IF THERE WILL BE A SVR WEATHER THREAT
ACROSS THE EXT SW ZONES...BUT AM GOING TO INCLUDE ALL SE TX COUNTIES
IN THE THREAT TONIGHT. WILL UPDATE GRIDS...ZONES AND HWO ASAP.
33
&&

.PREV DISCUSSION...
AFTER WATCHING RADAR TRENDS NW OF THE AREA AND EXAMINING SOME OF THE
SHORT-TERM MODEL GUIDANCE...I HAVE DECIDED TO RAISE THE POPS TO
LIKELY ACROSS THE NORTHERN ZONES AND TO MENTION A SVR TSTM
POSSIBILITY ALONG AND NORTHEAST OF A CALDWELL TO CONROE TO LIBERTY
LINE. DIFFICULT PART OF THIS FORECAST CONCERNS THE STRENGTH OF THE
CAP ACROSS THE CENTRAL AND SOUTHERN ZONES. IT IS POSSIBLE THAT THE
SEVERE THREAT AREA WILL HAVE TO BE NUDGED A LITTLE FURTHER
SOUTH...BUT AM NOT VERY CONFIDENT ON THAT YET. DUE TO VERY STEEP
LAPSE RATES AND THE LINEAR MCS THAT IS DEVELOPING...THE MAIN THREATS
WILL BE HAIL AND STRONG WINDS. 33

&&
.PRELIMINARY POINT TEMPS/POPS...
COLLEGE STATION (CLL)      58  76  53  73  54 /  80  10  10   0  10
HOUSTON (IAH)              63  78  55  75  54 /  60  10  10   0  10
GALVESTON (GLS)            68  75  62  76  61 /  50  20  10   0  10

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
.TX...SEVERE THUNDERSTORM WATCH UNTIL 4 AM ALONG AND NW OF A
COLUMBUS TO ANDERSON TO HUNTSVILLE TO TRINITY LINE.
.GM...SCA BAYS AND 0-60NM GULF.

&&

Hazardous weather outlook, Apr 5, 8:44 PM CDT, 5 hours 50 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
844 PM CDT TUE APR 5 2005

TXZ163-164-176>179-195>200-210>214-226-227-235>238-061200-
AUSTIN-BRAZORIA-BRAZOS-BURLESON-CHAMBERS-COLORADO-FORT BEND-GALVESTON-
GRIMES-HARRIS-HOUSTON-JACKSON-LIBERTY-MADISON-MATAGORDA-MONTGOMERY-
POLK-SAN JACINTO-TRINITY-WALKER-WALLER-WASHINGTON-WHARTON-
844 PM CDT TUE APR 5 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST TEXAS.

...SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS ALL OF SOUTHEAST
TEXAS TONIGHT...

.DAY ONE...TONIGHT.
AN APPROACHING DRY LINE WILL MOVE INTO SOUTHEAST TEXAS TONIGHT.
ALONG AND AHEAD OF THIS FEATURE...A BROKEN LINE OF STRONG TO SEVERE
THUNDERSTORMS HAS FORMED WEST OF SOUTHEAST TEXAS THIS EVENING.
THIS LINE WILL LIKELY MOVE ACROSS NORTHERN AND CENTRAL PORTIONS
OF SOUTHEAST TEXAS AND MAY BUILD FAR ENOUGH SOUTH TO AFFECT
THE EXTREME SOUTHERN PORTIONS. THE PRIMARY SEVERE WEATHER
THREATS ARE LARGE HAIL AND DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.
NO HAZARDOUS WEATHER IS ANTICIPATED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT....
SPOTTER ACTIVATION IS EXPECTED TONIGHT.

In the hours before

Local storm report, Apr 5, 9:57 PM CDT, 4 hours 37 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>

Local storm report, Apr 5, 10:59 PM CDT, 3 hours 35 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>

Local storm report, Apr 5, 11:21 PM CDT, 3 hours 13 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>

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 5, 9:19 PM CDT	Severe Thunderstorm Warning	HGX	Brazos, Burleson	57 min
Apr 5, 10:02 PM CDT	Severe Thunderstorm Warning	HGX	Houston	58 min
Apr 5, 10:03 PM CDT	Severe Thunderstorm Warning	HGX	Grimes	53 min
Apr 5, 11:37 PM CDT	Severe Thunderstorm Warning	HGX	San Jacinto, Walker	38 min
Apr 5, 11:49 PM CDT	Severe Thunderstorm Warning	HGX	Polk	41 min
Apr 6, 12:37 AM CDT	Severe Thunderstorm Warning	HGX	Jackson	39 min
Apr 6, 1:23 AM CDT	Special Marine Warning	HGX		97 min

Nearby

Severe Thunderstorm Warnings in Texas, 2005 Every severe thunderstorm warning in 2005

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.