Alert archive / Texas / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 76
The Storm Prediction Center issued this severe thunderstorm watch at Apr 7, 2002, 11:00 PM CDT for 20 counties in Texas. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 7, 2002, 11:00 PM CDT (04:00 UTC)
- Expired
- Apr 8, 2002, 3:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
Counties Angelina County, TX, Austin County, TX, Brazoria County, TX, Brazos County, TX, Colorado County, TX, Fort Bend County, TX, Grimes County, TX, Harris County, TX, Houston County, TX, Jackson County, TX, Leon County, TX, Madison County, TX, Montgomery County, TX, Polk County, TX, San Jacinto County, TX, Trinity County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 96 km from the middle of the area, began a volume at 04:00 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.
Warnings issued inside it
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 7, 11:16 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Washington | 59 min |
| Apr 7, 11:33 PM CDT | Severe Thunderstorm Warning | HGX | Harris, Waller | 57 min |
| Apr 8, 12:06 AM CDT | Severe Thunderstorm Warning | HGX | Montgomery | 54 min |
| Apr 8, 12:25 AM CDT | Severe Thunderstorm Warning | HGX | San Jacinto | 35 min |
| Apr 8, 12:31 AM CDT | Severe Thunderstorm Warning | HGX | Fort Bend, Harris | 59 min |
| Apr 8, 1:35 AM CDT | Severe Thunderstorm Warning | HGX | Brazoria | 55 min |
| Apr 8, 1:42 AM CDT | Tornado Warning | HGX | Brazoria, Galveston | 48 min |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 4.0 hours before the alert went out and 266 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
- 645 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 735 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 115 m²/s²
- 0-3 km storm-relative helicity
- 193 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS20 KWNS 080352 SEL6 SPC WW 080349 TXZ000-CWZ000-080800- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 76 STORM PREDICTION CENTER NORMAN OK 1049 PM CDT SUN APR 7 2002 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF SOUTHEAST TEXAS AND ADJACENT COASTAL WATERS EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 1100 PM UNTIL 300 AM CDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 50 STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES SOUTHWEST OF HOUSTON TEXAS TO 30 MILES WEST NORTHWEST OF LUFKIN TEXAS. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. OTHER WATCH INFORMATION... CONTINUE...WW 75... DISCUSSION...LINE OF STRONG/SEVERE STORMS WILL TRACK EASTWARD INTO THE UPPER TX GULF COAST REGION DURING THE NEXT FEW HOURS. AIRMASS IS MOIST AND MODERATELY UNSTABLE ACROSS THIS AREA...SUGGESTING A CONTINUED THREAT OF DAMAGING WINDS AND HAIL IN STRONGER CELLS. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 27040. ...HART 285,0965 312,0960 312,0942 285,0951
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 7, 8:00 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bastrop, Bell, Burleson, Caldwell, Collin and 36 more | 5 hr |
| Apr 8, 1:00 AM CDT | Severe Thunderstorm Watch | SPC | Aransas, Atascosa, Bee, Bexar, DeWitt, Frio and 12 more | 4 hr |
| Apr 8, 1:15 AM CDT | Severe Thunderstorm Watch | SPC | Chambers, Hardin, Jasper, Jefferson, Liberty, Newton and 4 more | 5 hr |
| Apr 8, 3:00 AM CDT | Severe Thunderstorm Watch | SPC | Austin, Brazoria, Calhoun, Colorado, Fort Bend, Galveston and 7 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Texas, 2002Every severe thunderstorm watch 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.