Alert archive / Louisiana / Tornado Watches in 2019
Tornado Watch 14
The Storm Prediction Center issued this tornado watch at Mar 9, 2019, 11:05 AM CST for Columbia County, Lafayette County, Union County, Arkansas; 5 parishes in Louisiana. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 9, 2019, 11:05 AM CST (17:05 UTC)
- Expired
- Mar 9, 2019, 3:00 PM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Columbia County, AR, Lafayette County, AR, Union County, AR, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, Union Parish, LA, Webster Parish, LA
The radar
The Shreveport radar (KSHV), 88 km from the middle of the area, began a volume at 17:05 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
- 60%
- One or more EF2 to EF5 tornadoes
- 30%
- Ten or more severe wind reports
- 60%
- 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
- 20%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 9, 11:17 AM CST | Severe Thunderstorm Warning | SHV | Bossier, Caddo, De Soto | 43 min |
| Mar 9, 11:20 AM CST | Severe Thunderstorm Warning | SHV | Columbia, Nevada, Union | 40 min |
| Mar 9, 11:24 AM CST | Tornado Warning | SHV | Columbia | 36 min |
| Mar 9, 11:59 AM CST | Severe Thunderstorm Warning | SHV | Columbia, Union | 37 min |
| Mar 9, 1:28 PM CST | Severe Thunderstorm Warning | SHV | Lincoln, Union | 32 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
Shreveport, LA (KBAD), launched 12:00Z, 5.1 hours before the alert went out and 80 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
- 968 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 576 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 226 m²/s²
- 0-3 km storm-relative helicity
- 271 m²/s²
- Significant tornado parameter
- 2.0
- Supercell composite
- 7.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 9, 1:58 AM CST | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 12 more | 92 min |
| Mar 9, 2:31 AM CST | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 11 more | 7 hr |
| Mar 9, 3:03 AM CST | Mesoscale Discussion | SPC | Clark, Columbia, Hempstead, Hot Spring, Howard, Lafayette and 8 more | 117 min |
| Mar 9, 3:49 AM CST | Severe Thunderstorm Watch | SPC | Sebastian | 7 hr |
| Mar 9, 4:45 AM CST | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 12 more | 60 min |
| Mar 9, 6:58 AM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Clark, Clay and 60 more | 2 hr |
| Mar 9, 7:18 AM CST | Severe Thunderstorm Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 36 more | 8 hr |
| Mar 9, 9:45 AM CST | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Jackson and 11 more | 3 hr |
| Mar 9, 10:32 AM CST | Tornado Watch | SPC | Arkansas, Ashley, Chicot, Clay, Craighead, Crittenden and 15 more | 8 hr |
| Mar 9, 10:59 AM CST | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Cleveland, Columbia, Dallas and 6 more | 2 hr |
| Mar 9, 1:27 PM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Chicot, Crittenden, Desha, Drew and 3 more | 2 hr |
| Mar 9, 1:58 PM CST | Tornado Watch | SPC | Ashley, Chicot | 5 hr |
| Mar 9, 2:26 PM CST | Mesoscale Discussion | SPC | Bienville, Caldwell, De Soto, Grant, Jackson, LaSalle and 4 more | 2 hr |
Nearby
Tornado Watches in Louisiana, 2019Tornado Watches in Arkansas, 2019Every tornado watch in 2019
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.