Alert archive / Texas / Tornado Warnings in 2001
Tornado Warning 21, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this tornado warning at Sep 20, 2001, 7:20 PM CDT for Harris County, Texas. It was in force for 40 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
- Sep 20, 2001, 7:20 PM CDT (00:20 UTC)
- Expired
- Sep 20, 2001, 8:00 PM CDT
- In force
- 40 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Harris County, TX
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 20, 7:45 PM CDT | Hail 0.75 | Jersey Village, TX |
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 00:00Z, 0.3 hours before the alert went out and 225 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
- 3819 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 1197 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -7 m²/s²
- 0-3 km storm-relative helicity
- 42 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
547
WFUS54 KHGX 210022
TORHOU
TXC201-210100-
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
720 PM CDT THU SEP 20 2001
THE NATIONAL WEATHER SERVICE HAS ISSUED A
* TORNADO WARNING FOR...
HARRIS COUNTY IN SOUTHEAST TEXAS
* UNTIL 800 PM CDT
* AT 713 PM CDT...DOPPLER RADAR INDICATED A THUNDERSTORM CAPABLE OF
PRODUCING A TORNADO NEAR THE GALLERIA...MOVING NORTHEAST AT 15 MPH.
THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING
PREVIOUSLY IN EFFECT.
* LOCATIONS IN THE PATH OF THE TORNADO INCLUDE...MUCH OF DOWNTOWN
HOUSTON...ALDINE...HUNTERS CREEK VILLAGE.
MOVE TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR. ABANDON YOUR CAR
OR MOBILE HOME FOR A STRONG SHELTER NOW
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 2974 9571 2967 9558 2975 9540 2992 9520
3005 9548The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 21, 2:26 PM CDT | Severe Thunderstorm Warning | HGX | Chambers, Harris, Liberty | 34 min |
| Sep 21, 3:02 PM CDT | Severe Thunderstorm Warning | HGX | Liberty | 28 min |
| Sep 21, 3:51 PM CDT | Severe Thunderstorm Warning | HGX | Houston | 24 min |
| Sep 21, 4:26 PM CDT | Severe Thunderstorm Warning | HGX | Austin | 49 min |
| Sep 21, 4:29 PM CDT | Severe Thunderstorm Warning | HGX | Montgomery | 46 min |
| Sep 21, 4:45 PM CDT | Severe Thunderstorm Warning | HGX | Harris | 30 min |
| Sep 21, 5:46 PM CDT | Severe Thunderstorm Warning | HGX | Galveston, Harris | 29 min |
| Sep 21, 5:50 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Fort Bend | 25 min |
| Sep 21, 6:15 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Galveston, Harris | 45 min |
| Sep 21, 6:19 PM CDT | Severe Thunderstorm Warning | HGX | Chambers, Liberty | 41 min |
Nearby
Tornado Warnings in Texas, 2001Every tornado warning in 2001Tornadoes in 2001
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.