Alert archive / Texas / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 1, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Feb 21, 2002, 4:34 PM CST for Harris County, Waller County, Texas. It was in force for 41 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Feb 21, 2002, 4:34 PM CST (22:34 UTC)
- Expired
- Feb 21, 2002, 5:15 PM CST
- In force
- 41 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Whole counties
Counties Harris County, TX, Waller County, TX
The radar
The Houston radar (KHGX), 78 km from the middle of the area, began a volume at 22:38 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, 5:15 PM CST | Hail 0.75 | Jersey Village, TX | Emergency Manager reported 3/4 inch hail at Highway 290 and Beltway 8. |
| Feb 21, 5:23 PM CST | Hail 1 | Jersey Village, TX | Storm spotter reported 1.00 inch hail at FM 249 and Beltway 8. |
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 nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.6 hours before the alert went out and 241 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 212234 SVRHOU TXC201-473-212315- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 432 PM CST THU FEB 21 2002 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WALLER COUNTY IN SOUTHEAST TEXAS HARRIS COUNTY IN SOUTHEAST TEXAS * UNTIL 515 PM CST * AT 428 PM CST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES NORTHWEST OF KATY...MOVING EAST AT 20 MPH. * LOCATIONS IN THE PATH OF THE SEVERE THUNDERSTORM INCLUDE... WADSWORTH...PATTISON...MONAVILLE...BROOKSHIRE KATY AND JERSEY VILLAGE HAIL WILL BE THE PRIMARY THREAT FROM 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.
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, 1 hour 54 minutes earlier.
Area forecast discussion, Feb 21, 2:40 PM CST, 1 hour 54 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, 5:23 PM CST | Severe Thunderstorm Warning | HGX | Harris | 37 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.