Alert archive / Texas / Tornado Watches in 1999
Tornado Watch 89
The Storm Prediction Center issued this tornado watch at Mar 13, 1999, 2:00 AM CST for 14 counties in Texas. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 13, 1999, 2:00 AM CST (08:00 UTC)
- Expired
- Mar 13, 1999, 5:00 AM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
Counties Brazoria County, TX, Chambers County, TX, Fort Bend County, TX, Galveston County, TX, Hardin County, TX, Harris County, TX, Jefferson County, TX, Liberty County, TX, Montgomery County, TX, Orange County, TX, Polk County, TX, San Jacinto County, TX, Tyler County, TX, Waller County, TX
The radar
The Houston radar (KHGX), 42 km from the middle of the area, began a volume at 07:59 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
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 13, 2:03 AM CST | Severe Thunderstorm Warning | HGX | Liberty | 42 min |
| Mar 13, 2:05 AM CST | Tornado Warning | HGX | Polk | 50 min |
| Mar 13, 2:14 AM CST | Severe Thunderstorm Warning | HGX | Montgomery | 26 min |
| Mar 13, 2:15 AM CST | Flash Flood Warning | LCH | Tyler | 3 hr |
| Mar 13, 2:26 AM CST | Tornado Warning | LCH | Tyler | 64 min |
| Mar 13, 2:30 AM CST | Severe Thunderstorm Warning | HGX | Harris | 45 min |
| Mar 13, 2:37 AM CST | Flash Flood Warning | HGX | Polk | 3 hr |
| Mar 13, 2:37 AM CST | Tornado Warning | HGX | Liberty | 23 min |
| Mar 13, 2:56 AM CST | Severe Thunderstorm Warning | HGX | Chambers, Liberty | 49 min |
| Mar 13, 3:08 AM CST | Tornado Warning | HGX | Liberty | 37 min |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 8.0 hours before the alert went out and 195 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, 8:00 PM CST | Tornado Watch | SPC | Aransas, Austin, Bee, Brazoria, Brazos, Calhoun and 35 more | 6 hr |
| 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, 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; radar from the NEXRAD Level II archive.