Alert archive / Texas / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 9, NWS Houston/Galveston, TX

March 25, 2002Liberty County, Montgomery County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Mar 25, 2002, 10:39 PM CST for Liberty County, Montgomery County, Texas. It was in force for 51 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: Mar 25, 2002, 10:39 PM CST (04:39 UTC)
Expired: Mar 25, 2002, 11:30 PM CST
In force: 51 min
Issued by: NWS Houston/Galveston, TX
Area: Counties, with a storm outline in the text

Counties Liberty County, TX, Montgomery County, TX

The radar

The Houston radar (KHGX), 85 km from the middle of the area, began a volume at 04:41 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 severe thunderstorm 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.

Issued	Product	Office	Lasted
Mar 25, 7:30 PM CST	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 4.7 hours before the alert went out and 184 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: 819 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 932 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KHGX 260439
SVRHOU
TXC291-339-260530-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1038 PM CST MON MAR 25 2002

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN MONTGOMERY COUNTY IN SOUTHEAST TEXAS
  NORTHERN LIBERTY COUNTY IN SOUTHEAST TEXAS

* UNTIL 1130 PM CST

* AT 1031 PM CST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER
  ROMAN FOREST...MOVING NORTHEAST AT 20 MPH.

* LOCATIONS IN THE PATH OF THE SEVERE THUNDERSTORM INCLUDE...
  PLUM GROVE...PATTON VILLAGE...ROMAN FOREST...SPLENDORA
  CLEVELAND

HAIL UP TO QUARTER SIZE IS POSSIBLE WITH THIS STORM.

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 3023 9531 3011 9521 3017 9509 3025 9481
          3045 9491

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 Mar 25, 10:05 PM CST, 34 minutes earlier.

Area forecast discussion, Mar 25, 10:05 PM CST, 34 minutes before

SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1005 PM CST MON MAR 25 2002

WILL SEND OUT A QUICK ZONE UPDATE. BASED ON CURRENT SATELLITE TRENDS
AND LATEST MODEL DATA...EXPECT SOME CLEARING NORTHERN ZONES BY LATE
TONIGHT AND HAVE DECIDED TO LOWER TEMPS THESE AREAS.

WW REMAINS IN EFFECT UNTIL 07Z FOR ERN ZONES. FRONT HAS REACHED
COASTAL SECTIONS OF GALVESTON/CHAMBERS COUNTIES. NEW ELEVATED
CONVECTION DEVELOPING ACROSS HARRIS COUNTY BEHIND FRONT. WILL KEEP
THE WATCH GOING FOR AT LEAST ANOTHER HOUR OR TWO UNTIL CONVECTION
DIMINISHES OR MOVES OUT OF THE AREA.

35/30

.HGX...SCA BAYS AND COASTAL WATERS 0-60 NM TONIGHT AND TOMORROW.

PRELIMS...
CLL EB 040/066 042/070 048 000
IAH EB 047/067 044/072 049 700
GLS EB 055/065 051/068 056 700

In the hours before

Special weather statement, Mar 25, 8:05 PM CST, 2 hours 34 minutes before

TXZ164-178-179-199-200-213-214-237-238-260700-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
805 PM CST MON MAR 25 2002

...SEVERE THUNDERSTORM WATCH FOR PARTS OF SOUTHEAST TEXAS UNTIL 1
AM...

THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH
FOR THE EASTERN PARTS OF SOUTHEAST TEXAS UNTIL 1 AM. THE WATCH IS
IN EFFECT EAST OF A LINE FROM TRINITY TO HOUSTON TO LAKE JACKSON.

THE FOLLOWING COUNTIES ARE IN THE WATCH...TRINITY...POLK...SAN
JACINTO...MONTGOMERY...HARRIS...BRAZORIA...GALVESTON...LIBERTY...AND
CHAMBERS.

SOME COMMUNITIES INCLUDED IN THE WATCH ARE GROVETON...CORRIGAN...
LIVINGSTON...COLDSPRING...CONROE...HOUSTON...LIBERTY...ANAHUAC...
GALVESTON...AND LAKE JACKSON.

A COLD FRONT IS PUSHING EAST ACROSS SOUTHEAST TEXAS. SCATTERED
THUNDERSTORMS ARE DEVELOPING ALONG AND BEHIND THE FRONT. SOME OF
THESE STORMS MAY BECOME SEVERE AS THE EVENING PROGRESSES. THE THREAT
FOR SEVERE WEATHER WILL END LATER THIS EVENING.

A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR
THUNDERSTORMS TO PRODUCE DAMAGING WIND GUSTS AND LARGE HAIL. A
SEVERE THUNDERSTORM WARNING IS ISSUED WHEN SEVERE WEATHER IS IMMINENT
OR OCCURRING.

STAY TUNED TO NOAA WEATHER RADIO AND LOCAL MEDIA FOR ADDITIONAL
UPDATES AND POSSIBLE WARNINGS. IF YOU ARE IN THE PATH OF A SEVERE
THUNDERSTORM...MOVE INSIDE TO A REINFORCED STRUCTURE AND STAY AWAY
FROM WINDOWS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 25, 7:27 PM CST	Severe Thunderstorm Warning	HGX	Trinity	48 min
Mar 25, 8:16 PM CST	Severe Thunderstorm Warning	HGX	Polk	44 min
Mar 26, 12:13 AM CST	Severe Thunderstorm Warning	HGX	Harris, Liberty	62 min

Nearby

Severe Thunderstorm Warnings in Texas, 2002 Every severe thunderstorm warning in 2002

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.