Alert archive / Texas / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 2, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Feb 21, 2002, 5:23 PM CST for Harris County, Texas. It was in force for 37 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Feb 21, 2002, 5:23 PM CST (23:23 UTC)
- Expired
- Feb 21, 2002, 6:00 PM CST
- In force
- 37 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Counties, with a storm outline in the text
County Harris County, TX
The radar
The Houston radar (KHGX), 59 km from the middle of the area, began a volume at 23:24 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 |
|---|---|---|---|
| Feb 21, 5:23 PM CST | Hail 1 | Jersey Village, TX | Storm spotter reported 1.00 inch hail at FM 249 and Beltway 8. |
| Feb 21, 5:26 PM CST | Hail 0.75 | Jersey Village, TX | Police department reported 3/4 inch hail at Jones Road and FM 1960. |
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.
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 12:00Z, 11.4 hours before the alert went out and 210 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2723 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 41 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS54 KHGX 212323 SVRHOU TXC201-220000- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 521 PM CST THU FEB 21 2002 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... HARRIS COUNTY IN SOUTHEAST TEXAS * UNTIL 600 PM CST * AT 514 PM CST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR THE INTERSECTION OF HIGHWAY 290 AND BELTWAY 8...MOVING EAST AT 20 MPH. * LOCATIONS IN THE PATH OF THE SEVERE THUNDERSTORM INCLUDE... JERSEY VILLAGE ALDINE BUSH-INTERCONTINENTAL AIRPORT HUMBLE LAKE HOUSTON DAM...SHELDON HAIL UP TO THE SIZE OF DIMES IS LIKELY WITH THIS STORM. PUBLIC REPORTED DIME SIZED HAIL NEAR HIGHWAY 290 AND THE VICINITY OF BELTWAY 8 AT 517 PM. 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 3001 9559 2983 9558 2980 9504 3005 9504
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 Feb 21, 2:40 PM CST, 2 hours 43 minutes earlier.
Area forecast discussion, Feb 21, 2:40 PM CST, 2 hours 43 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 240 PM CST THU FEB 21 2002 WE ARE BACK IN BUSINESS AFTER AN AWIPS SOFTWARE UPGRADE. THANKS TO SURROUNDING OFFICES FOR KEEPING AN EYE ON THINGS. WILL BE DOING SOME SIG REVISIONS TO THE TNGT PERIOD OF THE FCST. ALL MODELS CONT TO SHOW INCRG MOISTURE ASSOCIATED WITH FROPA TNGT. UPR TROF IS ALSO FAIRLY HEALTHY...AND RADAR TRENDS SHOW SLOW INCR IN ACTIVITY JUST N OF CWA. WITH THE ABV IN MIND...WILL USE HI CHC AND LKLY POPS TNGT. DRYING TAKES PLACE FROM N TO S TMRW MORNING. WILL MAINTAIN SLGT CHC POPS COAST EARLY. NEXT CDFNT THROUGH ON MON. LOOKS LIKE IT MIGHT HAVE SLIGHTLY MORE MOISTURE TO WORK WITH THAN PREV RUNS. WILL INCLUDE A SLGT CHC FOR MON. WILL HOIST AN SCA THIS UPDATE. TIGHT GRADIENT AND CAA BEHIND FNT SHD LEAD TO 20 KT OR HIGHER SPEEDS OVR THE MARINE AREA TNGT. 46/45/39/BT .HGX...SMALL CRAFT ADVISORY ALL WATERS. PRELIMS... CLL UU 045/062 033/071 048 500 IAH BU 045/062 034/071 049 610 GLS BU 048/062 046/064 055 720 (510 SW)
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 4:34 PM CST | Severe Thunderstorm Warning | HGX | Harris, Waller | 41 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2002Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.