Alert archive / Texas / Tornado Watches in 1999
Tornado Watch 86
The Storm Prediction Center issued this tornado watch at Mar 12, 1999, 8:00 PM CST for 41 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 12, 1999, 8:00 PM CST (02:00 UTC)
- Expired
- Mar 13, 1999, 2:00 AM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 41 counties
Aransas County, TX, Austin County, TX, Bee County, TX, Brazoria County, TX, Brazos County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, DeWitt County, TX, Fayette County, TX, Fort Bend County, TX, Galveston County, TX, Goliad County, TX, Gonzales County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Houston County, TX, Jackson County, TX, Jefferson County, TX, Karnes County, TX, Lavaca County, TX, Liberty County, TX, Live Oak County, TX, Madison County, TX, Matagorda County, TX, McMullen County, TX, Montgomery County, TX, Nueces County, TX, Orange County, TX, Polk County, TX, Refugio County, TX, San Jacinto County, TX, San Patricio County, TX, Trinity County, TX, Tyler County, TX, Victoria County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX
Warnings issued inside it
16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 9:20 PM CST | Tornado Warning | HGX | Polk | 40 min |
| Mar 12, 9:28 PM CST | Severe Thunderstorm Warning | LCH | Tyler | 62 min |
| Mar 12, 9:55 PM CST | Severe Thunderstorm Warning | HGX | Brazos, Burleson, Washington | 50 min |
| Mar 12, 10:04 PM CST | Tornado Warning | LCH | Tyler | 66 min |
| Mar 12, 10:25 PM CST | Severe Thunderstorm Warning | CRP | La Salle, McMullen | 65 min |
| Mar 12, 10:40 PM CST | Severe Thunderstorm Warning | HGX | Brazos, Grimes, Washington | 50 min |
| Mar 12, 10:40 PM CST | Severe Thunderstorm Warning | HGX | Madison | 50 min |
| Mar 12, 11:15 PM CST | Severe Thunderstorm Warning | HGX | Houston, Madison, Walker | 45 min |
| Mar 12, 11:28 PM CST | Severe Thunderstorm Warning | CRP | Duval, Live Oak, McMullen | 62 min |
| Mar 12, 11:45 PM CST | Severe Thunderstorm Warning | HGX | San Jacinto, Trinity | 45 min |
| Mar 13, 12:10 AM CST | Severe Thunderstorm Warning | HGX | Polk, Trinity | 35 min |
| Mar 13, 12:24 AM CST | Severe Thunderstorm Warning | HGX | San Jacinto, Walker | 36 min |
| Mar 13, 12:25 AM CST | Flash Flood Warning | LCH | Tyler | 2 hr |
| Mar 13, 1:34 AM CST | Tornado Warning | HGX | Montgomery | 26 min |
| Mar 13, 1:45 AM CST | Severe Thunderstorm Warning | HGX | Harris | 45 min |
| Mar 13, 1:59 AM CST | Tornado Warning | HGX | Harris | 31 min |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 2.0 hours before the alert went out and 350 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
- 892 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 549 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 213 m²/s²
- 0-3 km storm-relative helicity
- 327 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 9.8
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 12, 9:00 PM CST | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 14 more | 5 hr |
| Mar 12, 10:30 PM CST | Tornado Watch | SPC | Angelina, Jasper, Nacogdoches, Newton, Sabine, San Augustine and 1 more | 7 hr |
| Mar 13, 2:00 AM CST | Tornado Watch | SPC | Brazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 8 more | 3 hr |
| Mar 13, 5:00 AM CST | Tornado Watch | SPC | Jefferson, Orange | 5 hr |
Nearby
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.