Alert archive / Texas / Severe Thunderstorm Warnings in 2000

Severe Thunderstorm Warning 55, NWS Houston/Galveston, TX

April 7, 2000Polk County, Trinity County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 7, 2000, 10:44 PM CDT for Polk County, Trinity County, Texas. It was in force for 46 min. 1 report came from 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, with what was reported inside it.

The facts

Issued: Apr 7, 2000, 10:44 PM CDT (03:44 UTC)
Expired: Apr 7, 2000, 11:30 PM CDT
In force: 46 min
Issued by: NWS Houston/Galveston, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Polk County, TX, Trinity County, TX

The radar

The Houston radar (KHGX), 162 km from the middle of the area, began a volume at 03:37 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.

What was reported inside it

Time	Report	Where	Remark
Apr 7, 11:05 PM CDT	Hail 0.75	Moscow, TX	Dime sized hail also reported in Leggett.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 7, 8:30 PM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 3.7 hours before the alert went out and 189 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: 803 J/kg
Mixed-layer CIN: -309 J/kg
Mixed-layer LCL: 903 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 121 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.

224 
WUUS54 KHGX 080348
SVRHOU
TXC373-455-080430-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1044 PM CDT FRI APR 7 2000

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

* SEVERE THUNDERSTORM WARNING FOR...
  POLK COUNTY IN SOUTHEAST TEXAS
  TRINITY COUNTY IN SOUTHEAST TEXAS

* UNTIL 1130 PM CDT

* AT 1042 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 10
  MILES NORTHWEST OF CORRIGAN...MOVING SOUTHEAST AT 25 MPH.

* LOCATIONS IN THE PATH OF THE SEVERE THUNDERSTORM INCLUDE...
  MOSCOW
  SEVEN OAKS
  LEGGETT
  LIVINGSTON

THIS STORM WILL LIKELY PRODUCE LARGE HAIL AND POSSIBLY WINDS IN 
EXCESS OF 60 MPH.

MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR
BUSINESS.

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 3112 9497 3103 9516 3061 9493 3073 9468

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 7, 8:30 PM CDT, 2 hours 14 minutes earlier.

Area forecast discussion, Apr 7, 8:30 PM CDT, 2 hours 14 minutes before

SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
830 PM CDT FRI APR 7 2000

FRONT AT 8 PM WAS ROUGHLY ALONG A KTXK-KTYR-KGRK-KJCT LINE. TSTMS IN
NE TX ALONG THE FRONT CURRENTLY APPROACHING NE ZONES. THESE SHOULD
STAY ALIVE FOR THE NEXT FEW HOURS...BUT WILL GRADUALLY WEAKEN WITH
THE LOSS OF HEATING & WILL BE APPROACHING A CAPPED ATMOS VIA LCH
SOUNDING. TSTMS IN THE HILL COUNRTY ASSOCIATED WITH INTERSECTION OF
DRY LINE & THE FRONT & SHOULD CONTINUE ON A SWD TRACK. DONT HAVE
MUCH NEW DATA TO LOOK AT OTHER THAT 00Z SOUNDINGS AND 18Z MESO-ETA
WHICH ALSO SHOWS A LOT OF LIFT ALONG THE FRONT. LOOKING AT THE LCH
SOUNDING ITS GONNA HAVE A HARD TIME BUSTING THE CAP WHERE ITS NOT
ALREADY GOING...BUT STRANGER THINGS HAVE HAPPENED. WILL ONLY BUMP
POPS UP A CAT NE ZONES OTHERWISE LET THE CURRENT ZONES RIDE FOR THE
TIME BEING...BUT WILL PROBABLY NEED TO BE UPDATED LATER TONIGHT
(REMOVING POPS).

47/38/TOM

.KHGX...SVR WATCH 162 NE COS TIL MIDNIGHT
        SCA BAYS AND COASTAL WATERS 0-60NM LATE TONIGHT AND SAT
        WIND ADVZY ALL COAST ZNS (INCL HARRIS) TONIGHT AND SAT

PRELIMS...
NE  UU 044/067 042/072 049 600
CLL UU 044/068 042/073 049 300
IAH UU 049/070 044/072 051 300
GLS UU 056/068 052/071 056 300
SW  UU 056/070 052/072 056 300

In the hours before

Special weather statement, Apr 7, 8:55 PM CDT, 1 hour 49 minutes before

TXZ163-164-176>179-198-199-080500-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
855 PM CDT FRI APR 7 2000

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL MIDNIGHT FOR
PARTS OF EAST AND SOUTHEAST TEXAS...

THE STORM PREDICTION CENTER IN NORMAN OKLAHOMA HAS ISSUED A SEVERE
THUNDERSTORM WATCH UNTIL MIDNIGHT FOR PARTS OF EAST AND SOUTHEAST
TEXAS.  THE FOLLOWING COUNTIES ARE IN THE WATCH AREA... SAN
JACINTO... WALKER... HOUSTON... POLK   MONTGOMERY... MADISON...
GRIMES... GRIMES... AND TRINITY.  THE CITIES OF CROCKETT...
LIVINGSTON... GROVETON... COLDSPRING... HUNTSVILLE... ANDERSON... AND
MADISONVILLE ARE IN THE WATCH AREA.

A LINE OF THUNDERSTORMS ALONG A COLD FRONT WAS APPROACHING THE
ANDERSON/HOUSTON COUNTY LINE AT 845 PM.  SOME OF THESE STORMS HAVE A
HISTORY OF PRODUCING LARGE HAIL... AND LARGE HAIL AND HIGH WINDS WILL
CONTINUE TO BE THE PRIMARY THREAT AS THESE STORMS MOVE
THROUGH HOUSTON COUNTY BETWEEN 9 AND 1030 PM AND POSSIBLY INTO TRINITY
COUNTY.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS THAT SEVERE
THUNDERSTORMS ARE POSSIBLE IF NOT IMMINENT IN AND NEAR THE WATCH AREA.
STAY TUNED TO NOAA WEATHER RADIO AND LOCAL MEDIA FOR ADDITIONAL
STATEMENTS AND POSSIBLE WARNINGS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 9:06 PM CDT	Severe Thunderstorm Warning	HGX	Houston	54 min
Apr 7, 9:52 PM CDT	Severe Thunderstorm Warning	HGX	Houston, Madison	68 min
Apr 7, 10:15 PM CDT	Severe Thunderstorm Warning	HGX	Brazos	60 min
Apr 7, 10:22 PM CDT	Severe Thunderstorm Warning	HGX	Trinity	68 min
Apr 7, 10:32 PM CDT	Severe Thunderstorm Warning	HGX	Walker	43 min
Apr 7, 10:51 PM CDT	Severe Thunderstorm Warning	HGX	San Jacinto	54 min
Apr 8, 12:05 AM CDT	Severe Thunderstorm Warning	HGX	Montgomery	55 min
Apr 8, 12:13 AM CDT	Severe Thunderstorm Warning	HGX	Harris	62 min

Nearby

Severe Thunderstorm Warnings in Texas, 2000 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.