Alert archive / Texas / Tornado Warnings in 2004

Tornado Warning 22, NWS Houston/Galveston, TX

May 1, 2004Galveston County, Texas

NWS Houston/Galveston, TX issued this tornado warning at May 1, 2004, 11:41 AM CDT for Galveston County, Texas. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 1, 2004, 11:41 AM CDT (16:41 UTC)
Expired
May 1, 2004, 12:15 PM CDT
In force
34 min
Issued by
NWS Houston/Galveston, TX
Area
Counties, with a storm outline in the text

County Galveston County, TX

The radar

The Houston radar (KHGX), 12 km from the middle of the area, began a volume at 16:44 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this tornado warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
May 1, 9:45 AM CDTTornado WatchSPC5 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 4.7 hours before the alert went out and 196 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, Lake Charles Mun, LA at 12:00Z on 2004-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 326 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2004-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 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
326 J/kg
Mixed-layer CIN
-239 J/kg
Mixed-layer LCL
978 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
263 m²/s²
Significant tornado parameter
0.0
Supercell composite
9.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

929 
WFUS54 KHGX 011641
TORHOU
TXC167-011715-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1139 AM CDT SAT MAY 1 2004

THE NATIONAL WEATHER SERVICE IN LEAGUE CITY HAS ISSUED A

* TORNADO WARNING FOR...
  GALVESTON COUNTY IN SOUTHEAST TEXAS

* UNTIL 1215 PM CDT

* AT 1134 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 5 MILES SOUTH OF
  SANTA FE...MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IN THE PATH OF THE TORNADO INCLUDE TEXAS CITY...LA
  MARQUE...HITCHCOCK...DICKINSON...BAYOU VISTA AND BACLIFF.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN THE INTERIOR HALLWAY OR
A ROOM SUCH AS A CLOSET ON THE LOWEST LEVEL OF A STURDY BUILDING. USE
BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM
WINDOWS.

IF YOU ARE INSIDE A MOBILE HOME OR VEHICLE...EVACUATE THEM
IMMEDIATELY AND SEEK SHELTER INSIDE A STURDY BUILDING. AS A LAST
RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW SPOT AND COVER YOUR
HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 3 PM.

PLEASE REPORT SEVERE WEATHER TO THE COUNTY SHERIFF...LOCAL POLICE...
OR DEPARTMENT OF PUBLIC SAFETY. THEY WILL RELAY YOUR REPORT TO THE
NATIONAL WEATHER SERVICE.

LAT...LON 2937 9516 2924 9506 2935 9483 2952 9500

$$

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at May 1, 10:00 AM CDT, 1 hour 41 minutes earlier.

Area forecast discussion, May 1, 10:00 AM CDT, 1 hour 41 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
10 AM CDT SAT MAY 1 2004

.DISCUSSION...
HAVE MADE A QUICK UPDATE TO ZONES TO ACCOUNT FOR THE NEW TORNADO
WATCH. TOA#143 COVERS THE COASTAL/NEAR COASTAL COUNTIES OF SE TX
UNTIL 3PM. HOWEVER...NOT ANTICIPATING THE WATCH TO HOLD OVER THE
CWFA THROUGH THE OFFICAL END TIME.  KEEPING THE FFA UP FOR THE
TIME BEING AS WELL. ADDITIONAL TWEAKING OF ZONES PROBABLY IN THE
WORKS THIS AFTN TO ACCOUNT FOR WINDS/TEMPS. 41/45/42

&&

.HGX WATCHES/WARNINGS/ADVISORIES...
TORNADO WATCH COASTAL/NEAR COASTAL ZONES OF SE TX UNTIL 3 PM.
FLOOD WATCH ALL OF SOUTHEAST TEXAS THROUGH 6 PM.
SCA ALL WATERS THIS AFTERNOON.
&&

.PRELIMINARY POINT TEMPS/POP...
COLLEGE STATION (CLL) 72 52 75 50 79 / 80 30 00 00 00
HOUSTON (IAH)         76 56 75 50 79 / 80 60 00 00 00
GALVESTON (GLS)       75 61 74 60 78 / 80 70 10 00 00
&&
Hazardous weather outlook, May 1, 10:24 AM CDT, 1 hour 17 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1024 AM CDT SAT MAY 1 2004

TXZ163-164-176>179-195>200-210>214-226-227-235>238-021200-
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-
1024 AM CDT SAT MAY 1 2004

...SEVERE THUNDERSTORMS AND LOCALLY HEAVY RAINFALL POSSIBLE ACROSS
SOUTHEAST TEXAS TODAY...

.DAY ONE...TODAY AND TONIGHT.
SHOWERS AND THUNDERSTORMS WILL CONTINUE ACROSS PORTIONS OF SOUTHEAST
TEXAS TODAY AHEAD OF A COLD FRONT. STRONG TO SEVERE THUNDERSTORMS AND
LOCALLY HEAVY RAINFALL ARE POSSIBLE WITH THESE STORMS...ESPECIALLY
ALONG AND SOUTH OF HIGHWAY 59. THE MAIN SEVERE WEATHER THREAT WILL BE
STRONG DAMAGING WINDS AND LARGE HAIL. ISOLATED TORNADOES WILL ALSO BE
POSSIBLE WITH THE STRONGER THUNDERSTORMS. ADDITIONAL RAINFALL AMOUNTS
OF 1 TO 3 INCHES ARE POSSIBLE...AND THIS MAY BRING TOTALS FOR THE
DAY TO A 5 TO 10 INCH RANGE. THIS WILL LIKELY LEAD TO SOME STREET...
CREEK AND RIVER FLOODING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.
NO HAZARDOUS WEATHER IS ANTICIPATED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS REQUESTED TODAY.

In the hours before

Special weather statement, May 1, 9:48 AM CDT, 1 hour 53 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
948 AM CDT SAT MAY 1 2004

GMZ330-335-350-355-370-375-TXZ200-213-214-226-227-235>238-012000-
BRAZORIA-CHAMBERS-FORT BEND-GALVESTON-GALVESTON BAY-HARRIS-JACKSON-
LIBERTY-MATAGORDA-MATAGORDA BAY-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL 20 NM TO 60 NM-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL OUT 20 NM-
WATERS FROM HIGH ISLAND TO FREEPORT 20 NM TO 60 NM-
WATERS FROM HIGH ISLAND TO FREEPORT OUT 20 NM-WHARTON-
948 AM CDT SAT MAY 1 2004

...TORNADO WATCH HAS BEEN ISSUED FOR THE SOUTHERN AND COASTAL
PORTIONS OF SOUTHEAST TEXAS UNTIL 300 PM CDT...

THE STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR THE
FOLLOWING SOUTHEAST TEXAS COUNTIES...BRAZORIA...CHAMBERS...FORT
BEND...GALVESTON...HARRIS...JACKSON...LIBERTY...MATAGORDA AND
WHARTON.

THIS TORNADO WATCH REPLACES THE TORNADO WATCH THAT WAS PREVIOUSLY IN
EFFECT FOR ALL OF SOUTHEAST TEXAS UNTIL 1000 AM CDT.

A WARM AND UNSTABLE AIR MASS IS IN PLACE OVER THE AREA...ALLOWING
THUNDERSTORMS TO DEVELOP OVER THE COASTAL WATERS AND ADJACENT LAND
AREAS. WIND FIELDS ARE FAVORABLE FOR ISOLATED TORNADOES WITH THE
STRONGEST STORMS. IN ADDITION TO THE SEVERE WEATHER THREAT...LOCALLY
HEAVY RAINFALL MAY LEAD TO FLOODING...AND A FLOOD WATCH IS IN EFFECT
FOR ALL OF SOUTHEAST TEXAS UNTIL 600 PM CDT.

STAY TUNED TO YOUR LOCAL RADIO OR TELEVISION STATION...NOAA WEATHER
RADIO...OR VISIT OUR WEB SITE AT WWW.SRH.NOAA.GOV/HGX FOR MORE
INFORMATION.

The office that day

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

IssuedProductOfficeCountiesLasted
May 1, 4:38 AM CDTTornado WarningHGXLiberty52 min
May 1, 5:17 AM CDTSevere Thunderstorm WarningHGXMontgomery43 min
May 1, 5:30 AM CDTTornado WarningHGXLiberty45 min
May 1, 8:43 AM CDTFlash Flood WarningHGXHarris, Montgomery, Polk, San Jacinto107 min
May 1, 8:50 AM CDTTornado WarningHGXHarris40 min
May 1, 9:10 AM CDTSpecial Marine WarningHGX95 min
May 1, 9:10 AM CDTSpecial Marine WarningHGX95 min
May 1, 10:20 AM CDTSevere Thunderstorm WarningHGXChambers, Liberty55 min
May 1, 10:49 AM CDTSpecial Marine WarningHGX86 min
May 1, 11:22 AM CDTSpecial Marine WarningHGX113 min
May 1, 11:44 AM CDTFlash Flood WarningHGXBrazoria, Galveston2 hr
May 1, 11:58 AM CDTFlash Flood WarningHGXFort Bend, Harris, Liberty2 hr
May 1, 12:03 PM CDTFlash Flood WarningHGXPolk, San Jacinto4 hr
May 1, 12:16 PM CDTSpecial Marine WarningHGX59 min
May 1, 1:20 PM CDTSpecial Marine WarningHGX40 min

Nearby

Tornado Warnings in Texas, 2004Every tornado warning in 2004Tornadoes in 2004

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.