Alert archive / Texas / Tornado Watches in 2018
Tornado Watch 22
The Storm Prediction Center issued this tornado watch at Mar 28, 2018, 12:03 PM CDT for 18 parishes in Louisiana; 30 counties in Texas. It was in force for 9 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 28, 2018, 12:03 PM CDT (17:03 UTC)
- Expired
- Mar 28, 2018, 9:00 PM CDT
- In force
- 9 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 48 counties
Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, De Soto Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Rapides Parish, LA, Red River Parish, LA, Sabine Parish, LA, Vernon Parish, LA, Winn Parish, LA, Angelina County, TX, Austin County, TX, Brazoria County, TX, Chambers County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Matagorda County, TX, Montgomery County, TX, Nacogdoches County, TX, Newton County, TX, Orange County, TX, Polk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Trinity County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX
The radar
The Houston radar (KHGX), 134 km from the middle of the area, began a volume at 17:04 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 SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 40%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 28, 2:00 PM CDT | Flash Flood Warning | HGX | Brazos, Burleson, Grimes, Washington | 2 hr |
| Mar 28, 3:01 PM CDT | Severe Thunderstorm Warning | SHV | Bienville, Jackson, Natchitoches, Winn | 59 min |
| Mar 28, 3:25 PM CDT | Tornado Warning | SHV | Jackson, Natchitoches, Winn | 35 min |
| Mar 28, 3:55 PM CDT | Severe Thunderstorm Warning | SHV | Caldwell, Grant, Jackson, LaSalle, Ouachita, Winn | 50 min |
| Mar 28, 3:59 PM CDT | Tornado Warning | SHV | Caldwell, LaSalle, Winn | 31 min |
| Mar 28, 4:16 PM CDT | Tornado Warning | SHV | Jackson, Ouachita | 29 min |
| Mar 28, 4:26 PM CDT | Tornado Warning | SHV | Caldwell | 34 min |
| Mar 28, 4:37 PM CDT | Severe Thunderstorm Warning | HGX | Fort Bend, Harris, Waller | 23 min |
| Mar 28, 4:42 PM CDT | Severe Thunderstorm Warning | SHV | Caldwell, LaSalle, Ouachita | 33 min |
| Mar 28, 4:56 PM CDT | Severe Thunderstorm Warning | SHV | Grant, LaSalle, Natchitoches, Winn | 53 min |
| Mar 28, 5:00 PM CDT | Tornado Warning | SHV | Grant, LaSalle, Winn | 30 min |
| Mar 28, 5:30 PM CDT | Tornado Warning | HGX | Harris | 15 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 5.1 hours before the alert went out and 169 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
- 295 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 650 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 159 m²/s²
- 0-3 km storm-relative helicity
- 215 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.6
The text
As transmitted.
322
WWUS20 KWNS 281700
SEL2
SPC WW 281700
LAZ000-TXZ000-CWZ000-290200-
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 22
NWS Storm Prediction Center Norman OK
1200 PM CDT Wed Mar 28 2018
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Western and central Louisiana
Southeast and east Texas
Coastal Waters
* Effective this Wednesday afternoon and evening from NOON until
900 PM CDT.
* Primary threats include...
A couple tornadoes possible
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...Severe thunderstorms are expected to become more common
across the watch area through the remainder of the afternoon,
offering damaging gusts, isolated large hail, and the potential for
a couple tornadoes.
The tornado watch area is approximately along and 75 statute miles
north and south of a line from 65 miles north northwest of Palacios
TX to 25 miles north northeast of Alexandria LA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU2).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and 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.
&&
AVIATION...TORNADOES and 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 25030.
...EdwardsSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 28, 11:38 AM CDT | Mesoscale Discussion | SPC | Beauregard, Caldwell, Franklin, Grant, Jackson, LaSalle and 7 more | 67 min |
| Mar 28, 2:43 PM CDT | Mesoscale Discussion | SPC | East Carroll, Franklin, Madison, Morehouse, Richland, Tensas and 1 more | 92 min |
| Mar 28, 3:07 PM CDT | Mesoscale Discussion | SPC | Allen, Beauregard, Caldwell, Grant, Jackson, LaSalle and 4 more | 113 min |
| Mar 28, 3:27 PM CDT | Tornado Watch | SPC | Catahoula, Concordia, East Carroll, Franklin, Madison, Morehouse and 3 more | 8 hr |
| Mar 28, 5:32 PM CDT | Mesoscale Discussion | SPC | Madison, Tensas | 118 min |
| Mar 28, 5:48 PM CDT | Mesoscale Discussion | SPC | Allen, Beauregard, Calcasieu, Evangeline, Grant, LaSalle and 2 more | 87 min |
| Mar 27, 9:23 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bexar, Blanco, Caldwell, Comal and 20 more | 97 min |
| Mar 27, 9:51 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bastrop, Bexar, Caldwell, DeWitt, Dimmit and 15 more | 5 hr |
| Mar 27, 11:58 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bastrop, Bexar, Caldwell, Comal, DeWitt and 17 more | 2 hr |
| Mar 28, 5:05 AM CDT | Mesoscale Discussion | SPC | Bastrop, Brazos, Burleson, Fayette, Grimes, Lee and 1 more | 85 min |
| Mar 28, 9:09 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bexar, Frio, Medina, Wilson | 2 hr |
| Mar 28, 6:53 PM CDT | Mesoscale Discussion | SPC | Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 6 more | 97 min |
Nearby
Tornado Watches in Texas, 2018Tornado Watches in Louisiana, 2018Every tornado watch in 2018
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.