Alert archive / Texas / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 52, NWS Houston/Galveston, TX

June 21, 2002Grimes County, Montgomery County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Jun 21, 2002, 9:43 PM CDT for Grimes County, Montgomery County, Texas. It was in force for 47 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: Jun 21, 2002, 9:43 PM CDT (02:43 UTC)
Expired: Jun 21, 2002, 10:30 PM CDT
In force: 47 min
Issued by: NWS Houston/Galveston, TX
Area: Counties, with a storm outline in the text

Counties Grimes County, TX, Montgomery County, TX

The radar

The Houston radar (KHGX), 120 km from the middle of the area, began a volume at 02:44 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 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 nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 2.7 hours before the alert went out and 245 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: 309 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1947 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 48 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 220243
SVRHOU
TXC185-339-220330-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
943 PM CDT FRI JUN 21 2002

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GRIMES COUNTY IN SOUTHEAST TEXAS
  MONTGOMERY COUNTY IN SOUTHEAST TEXAS

* UNTIL 1030 PM CDT

* AT 939 PM CDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM OVER
  LAKE CONROE DAM...MOVING NORTHWEST AT 25 MPH.

* LOCATIONS IN THE PATH OF THE SEVERE THUNDERSTORM INCLUDE...
  LAKE CONROE DAM...PANORAMA VILLAGE
  MONTGOMERY
  DOBBIN
  DACUS
  RICHARDS

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 3036 9591 3026 9551 3041 9549 3058 9584

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 Jun 21, 8:32 PM CDT, 1 hour 11 minutes earlier.

Area forecast discussion, Jun 21, 8:32 PM CDT, 1 hour 11 minutes before

SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
830 PM CDT FRI JUN 21 2002

HAVE UPDATED ZFPHGX TO REFLECT LINGERING ISOLATED TO WIDELY SCATTERED
CONVECTION OVER WESTERN ZONES. EXPECT THIS TO DECREASE IN AREAL
COVERAGE AND INTENSITY NEXT 1-2 HOURS. OTHERWISE...THE REST OF
PREVIOUS FORECAST PACKAGE (INCLUDING MARINE) ON TRACK.

.HGX...NONE.

CLL BB 069/094 067/094 069 100
IAH BB 072/093 069/093 071 200
GLS BB 075/088 075/088 078 200

37/36/TF

PREVIOUS DISCUSSION...
SH/TSRA DEVELOPMENT STARTING TO PICK UP THIS AFTERNOON BUT COVERAGE
SO FAR HAS NOT BEEN EVEN CLOSE TO THAT OF YESTERDAY. THUS..IT WOULD
SEEM THAT THE DRIER/SUBSIDENT AIRMASS IS WINNING OUT ACROSS THE FA.
OVERALL SYNOPTIC PATTERN/SCHEMA NOT PROGGED TO CHANGE TOO MUCH FROM
THE PREVIOUS RUNS..SAVE FOR SOME MINOR DIFFERENCES WITH TIMING. THE
UPPER LOW IS STILL FORECAST TO MOVE WWD ALONG THE N/NC COAST TOWARD
OUR REGION THROUGH THE PERIOD..BUT NOW COULD BE CLOSE ENOUGH ON SUN
TO WARRANT THE RE-INTRODUCTION OF SOME LOWISH POPS STARTING AT THAT
TIMEFRAME. THE ENSUING WEAKNESS IN THE UPPER RIDGE WHICH IS PROGGED
TO EVOLVE INTO AN AMPLIFIED RIDGE OVER THE WEST AND DEEP TROFFINESS
TO THE EAST SHOULD HELP KEEP A SLIGHT CHC/CHC POPS IN OUR FCST THRU
MOST OF NEXT WEEK. WILL TAKE A BLEND OF MOS FOR THE FINAL TALLY FOR
TEMPS. 41/47

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 9:15 PM CDT	Severe Thunderstorm Warning	HGX	Montgomery	30 min
Jun 22, 1:03 PM CDT	Special Marine Warning	HGX		57 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.