Alert archive / Texas / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 77, NWS Houston/Galveston, TX

May 25, 2001Brazoria County, Fort Bend County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 25, 2001, 5:55 PM CDT for Brazoria County, Fort Bend County, Texas. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
May 25, 2001, 5:55 PM CDT (22:55 UTC)
Expired
May 25, 2001, 6:45 PM CDT
In force
50 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Brazoria County, TX, Fort Bend County, TX

The radar

The Houston radar (KHGX), 34 km from the middle of the area, began a volume at 22:57 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.9 hours before the alert went out and 227 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 2001-05-25Temperature 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, Lake Charles Mun, LA at 12:00Z on 2001-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1450 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
238 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KHGX 252257
SVRHOU
TXC039-157-252345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
555 PM CDT FRI MAY 25 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEAST BRAZORIA COUNTY IN SOUTHEAST TEXAS
  SOUTHEAST FORT BEND COUNTY IN SOUTHEAST TEXAS

* UNTIL 645 PM CDT

* AT 552 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 2   
MILES SOUTHWEST OF ARCOLA...MOVING SLOWLY TO THE SOUTHEAST.

* LOCATIONS IN THE PATH OF THE SEVERE THUNDERSTORM INCLUDE...
  ARCOLA...JULIFF...IOWA COLONY
  FRESNO
  MANVEL
  ALVIN

MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR
BUSINESS. STAY AWAY FROM WINDOWS

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 2958 9545 2947 9560 2925 9541 2943 9523

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 May 25, 3:00 PM CDT, 2 hours 55 minutes earlier.

Area forecast discussion, May 25, 3:00 PM CDT, 2 hours 55 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
300 PM CDT FRI MAY 25 2001

PARTLY CLOUDY OVER SERN TX EARLY THIS AFTERNOON. THE MAIN FORECAST
ISSUES ARE POPS TONIGHT THROUGH SUN...TEMPS MON-TUE...POPS/TEMPS
WED-FRI. THE 12Z NCEP MODELS ARE IN FAIR TO GOOD AGREEMENT...PREFER
AN AVN/ETA BLEND...BUT MAV/FWC GUIDANCE ARE SIMILAR EXCEPT FOR POPS
IN THE 2ND/3RD PERIODS. THE MEDIUM RANGE MODELS ARE IN LESS
AGREEMENT...SO WILL TREND TOWARD CLIMATOLOGY.

THE FRONT HAS STALLED AND WASHED OUT TO A FAIR DEGREE. MSAS PRESSURE
TRENDS SHOW LOW PRESSURE DEVELOPING OVER THE TX PANHANDLE AS
ADVERTISED IN THE MODELS. AGREE IN GENERAL WITH MODELS THAT FRONT
WILL REINVIGORATE AND MOVE NORTH AS A WARM FRONT. AGREE WITH SPC/HPC
THAT MAIN THREATS FOR HEAVY CONVECTION WILL BE NORTH OF OUR CWA.
WILL MAINTAIN LOWISH POPS THROUGH SUN...SLIGHTLY HIGHER FOR ZONE
GROUPS NEAR THE FRONT AS IT MOVES NORTH AND IN RELATION TO IMPULSES
TRAVELLING IN THE FAST NW FLOW. ATTM DO NOT ANTICIPATE THE NEED FOR
MENTION OF SEVERE IN THE FORECAST. WILL INTRODUCE SLIGHT CHANCE POPS
FOR THU-FRI AS ANOTHER FRONT/TROUGH COMBO PUSH THROUGH THE PLAINS.
TEMPS WILL BE A MAV/FWC BLEND IN THE SHORT TERM...MEX LOOK FINE FOR
THE EXTENDED. NO FLAGS FOR THE MARINE FORECAST.

.HGX...NONE.

31/40/WT

PRELIMS...
CLL BB 066/087 069/090 072 332
IAH BB 067/086 070/089 072 322
GLS BB 074/085 076/085 076 232

In the hours before

Local storm report, May 25, 2:57 PM CDT, 2 hours 58 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
257 PM CDT FRI MAY 25 2001

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

1100 AM    3 S MATAGORDA             TX   TORNADO
05/25/01   MATAGORDA                      REPORTED BY THE ARMY CORPS
                                          ENGINEERS AND THE PUBLIC.
                                          LARGE WATER SPOUT MOVED
                                          EAST-SOUTHEAST FROM THE                                           BAY TO A RESIDENTIAL AREA
                                          NEAR FM-2031 ON THE THE                                           MATAGORDA PENINSULA.

The office that day

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

IssuedProductOfficeCountiesLasted
May 25, 2:53 AM CDTSevere Thunderstorm WarningHGXWaller52 min
May 25, 11:02 AM CDTTornado WarningHGXMatagorda28 min
May 25, 4:25 PM CDTSevere Thunderstorm WarningHGXMatagorda, Wharton50 min

Nearby

Severe Thunderstorm Warnings in Texas, 2001Every 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.