Alert archive / Texas / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 113, NWS Houston/Galveston, TX

July 23, 2000Chambers County, Galveston County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Jul 23, 2000, 4:25 PM CDT for Chambers County, Galveston 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
Jul 23, 2000, 4:25 PM CDT (21:25 UTC)
Expired
Jul 23, 2000, 5:15 PM CDT
In force
50 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Chambers County, TX, Galveston County, TX

The radar

The Houston radar (KHGX), 77 km from the middle of the area, began a volume at 21:25 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, 9.4 hours before the alert went out and 127 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 2000-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2253 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 2000-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.1939Sfc1 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
2253 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
813 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
38 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KHGX 232130
SVRHOU
TXC071-167-232215-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
425 PM CDT SUN JUL 23 2000

THE NATIONAL WEATHER SERVICE IN HOUSTON/GALVESTON TX HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GALVESTON COUNTY IN SOUTHEAST TEXAS
  CHAMBERS COUNTY IN SOUTHEAST TEXAS

* UNTIL 515 PM CDT

* AT 415 PM CDT...DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS 
  OVER CHAMBERS COUNTY AND NORTHERN GALVESTON BAY. MOVEMENT WAS      
  SOUTH AT 20 MPH. THE STRONGEST STORMS WERE JUST NORTHEAST OF
  HIGH ISLAND AND EAST OF ANAHUAC. 

* LOCATIONS IN THE PATH OF THE SEVERE THUNDERSTORM INCLUDE...  
  BOLIVAR PENINSULA
  SOUTHERN CHAMBERS COUNTY
  KEMAH...LEAGUE CITY...DICKINSON
  
MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR 
BUSINESS. STAY AWAY FROM WINDOWS! WIND DAMAGE WAS REPORTED WITH 
THESE STORMS OVER NORTHERN CHAMBERS COUNTY. LARGE HAIL CAN BE 
EXPECTED AS WELL. 

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 2973 9439 2963 9456 2906 9415 2921 9392

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 Jul 23, 2:15 PM CDT, 2 hours 10 minutes earlier.

Area forecast discussion, Jul 23, 2:15 PM CDT, 2 hours 10 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
215 PM CDT SUN JUL 23 2000

TSRA CONT TO FIRE OVER NORTH AND CENTRAL ZONES THIS AFTERNOON AND
THIS TREND IS LIKELY CONTINUE TONIGHT. A WEAK COOL FRONT LIES ACROSS
SE TX AND THIS BOUNDARY WILL DRIFT SLOWLY SOUTH TONIGHT. ALTHO THE
MDLS PUSH THIS FRONT SOUTH OF THE FA...FEEL IT WILL HANG UP ALONG
THE COAST AND SW ZONES...AND THE WESTERN EDGE OF THE DISSIPATING
FRONT MAY ACTUALLY PIVOT NORTH ON MONDAY IN RESPONSE TO A DEVELOPING
SOUTHERLY FLOW. MAIN ISSUE IS SEVERE THREAT TONIGHT. 25H AND 30H
FIELDS SHOW UPPER WIND FIELD TO REMAIN DIVERGENT THROUGH 48 HRS. SE
TX LIES IN A LFQ WHICH WILL FURTHER ENHANCE LIFT INTO TONIGHT.
COUPLE THAT WITH CAPE VALUES NEAR 5000 J/KG AND LI'S OF -6 TO -10
AND SEVERE THREAT TO REMAIN HIGH. WIND SHEAR IS RELATIVELY WEAK
WHICH WILL LIKELY LIMIT WIDESPREAD ORGANIZED SEVERE THREAT.
POTENTIAL FOR WIND DAMAGE AND LARGE HAIL TO PERSIST INTO TONIGHT.
FEEL THIS IS NOT JUST AN EVENING EVENT AND COULD LAST TOWARD
MIDNIGHT. WILL ISSUE AN SPS DETAILING SEVERE THREAT BY 4 PM.

MONDAY...FRONT LINGERS IN THE AREA AND WEAKENS WITH TIME. ETA (MDL
DU JOUR) KEEPS ENOUGH MSTR IN PLACE AND WITH DIVERGENT UPPER LEVEL
WIND PATTERN...ANOTHER SPEED MAX AND DAYTIME HEATING...FEEL
ADDITIONAL TSRA POSSIBLE ESPECIALLY ALONG RESIDUAL CONVERGENT SFC
BNDRY. STILL FEEL THERE IS A SLT CHANCE OF TSRA ON TUESDAY AS UPPER
LEVEL WINDS REMAIN DIVERGENT...HOWEVER MSTR LEVELS DROP OVER THE
EAST AND SFC CONVERGENCE WEAKENS MARKEDLY.

EXTENDED...UKMET/ECMWF ARE NOT AS AGGRESSIVE AS THE MRF WITH THE CUT
OFF LOW OVER THE WESTERN GULF FOR THE END OF THE LWEEK. CURRENT
FORECAST HAS SLT CHC...SO WILL KEEP THINGS AS THEY ARE.

.HGX...NONE.

43/46

PRELIMS...
CLL BB 070/096 069/096 070 322
IAH BB 071/095 070/096 071 632
GLS BB 077/090 078/090 079 532

In the hours before

Special weather statement, Jul 23, 3:00 PM CDT, 1 hour 25 minutes before
TXZ163-164-176>179-195>200-210>214-226-227-235>238-240800-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
300 PM CDT SUN JUL 23 2000

...SLIGHT RISK OF SEVERE THUNDERSTORMS OVER SOUTHEAST TEXAS THROUGH
THIS EVENING...

THUNDERSTORMS ARE EXPECTED TO AFFECT SOUTHEAST TEXAS THROUGH THIS
EVENING. SOME OF THE STORMS COULD PRODUCE HAIL 3/4 INCH DIAMETER OR
LARGER...AND BRIEF DAMAGING WIND GUSTS. THE AREA AT RISK IS SOUTH OF
A LINE FROM BRYAN/COLLEGE STATION TO ONALASKA. THIS INCLUDES THE
HOUSTON/GALVESTON METRO AREA.

A WEAK COOL FRONT IS DRIFTING SLOWLY SOUTH ACROSS SOUTHEAST TEXAS.
THE AIRMASS SOUTH OF THE FRONT IS VERY WARM AND MOIST...MAKING THE
ATMOSPHERE UNSTABLE. THE LEVEL OF INSTABILITY MAY BE SUFFICIENT TO
CAUSE SOME OF THE STORMS TO BE SEVERE.

MOVE INDOORS IF YOU ARE IN THE PATH OF A STORM. LIGHTNING IS A
POTENTIAL KILLER IN ANY THUNDERSTORM. BE ALERT THIS EVENING FOR THE
POSSIBILITY OF ISOLATED LARGE HAIL AND WIND DAMAGE...SUCH AS DOWNED
TREES AND POWERLINES. ELECTRICITY MAY BE INTERRUPTED IN SPOTS. IF
YOU ARE BOATING ON ANY OF THE AREA LAKES THIS AFTERNOON...MOVE
QUICKLY TO SHORE IF THUNDERSTORMS DEVELOP NEARBY. A QUICK INCREASE
IN WINDS AND WAVES COULD BE ENOUGH TO OVERTURN YOUR CRAFT.

STAY TUNED TO NOAA WEATHER RADIO OR LOCAL MEDIA FOR ADDITIONAL
UPDATES AND THE LATEST FORECASTS AND STATEMENTS FROM THE NATIONAL
WEATHER SERVICE.

	$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 23, 2:47 PM CDTSevere Thunderstorm WarningHGXLiberty43 min
Jul 23, 2:48 PM CDTSevere Thunderstorm WarningHGXMontgomery42 min
Jul 23, 3:23 PM CDTSevere Thunderstorm WarningHGXHarris52 min
Jul 23, 3:28 PM CDTSevere Thunderstorm WarningHGXLiberty47 min
Jul 23, 3:45 PM CDTSevere Thunderstorm WarningHGXChambers45 min
Jul 23, 4:22 PM CDTSevere Thunderstorm WarningHGXFort Bend, Harris53 min
Jul 23, 5:14 PM CDTSevere Thunderstorm WarningHGXBrazoria, Galveston46 min
Jul 23, 5:17 PM CDTSevere Thunderstorm WarningHGXAustin43 min
Jul 23, 6:02 PM CDTSevere Thunderstorm WarningHGXBrazoria43 min
Jul 23, 6:02 PM CDTSevere Thunderstorm WarningHGXAustin, Colorado43 min
Jul 23, 6:25 PM CDTSevere Thunderstorm WarningHGXWharton65 min
Jul 23, 6:50 PM CDTSevere Thunderstorm WarningHGXJackson55 min

Nearby

Severe Thunderstorm Warnings in Texas, 2000Every severe thunderstorm warning in 2000

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.