Alert archive / Louisiana / Severe Thunderstorm Watches in 2016
Severe Thunderstorm Watch 47
The Storm Prediction Center issued this severe thunderstorm watch at Mar 18, 2016, 1:35 PM CDT for 4 states. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 18, 2016, 1:35 PM CDT (18:35 UTC)
- Expired
- Mar 18, 2016, 8:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 55 kt
All 57 counties
Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Columbia County, AR, Drew County, AR, Hempstead County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Ouachita County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Madison County, MS, Rankin County, MS, Sharkey County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Red River County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 82 km from the middle of the area, began a volume at 18:37 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
- 5%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 70%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 80%
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 18, 1:52 PM CDT | Severe Thunderstorm Warning | JAN | Richland, West Carroll | 23 min |
| Mar 18, 1:56 PM CDT | Severe Thunderstorm Warning | SHV | Red River | 64 min |
| Mar 18, 2:00 PM CDT | Severe Thunderstorm Warning | JAN | Morehouse | 20 min |
| Mar 18, 2:07 PM CDT | Severe Thunderstorm Warning | SHV | Jackson, Lincoln, Ouachita, Union | 53 min |
| Mar 18, 2:12 PM CDT | Severe Thunderstorm Warning | JAN | East Carroll | 48 min |
| Mar 18, 2:13 PM CDT | Severe Thunderstorm Warning | JAN | Humphreys, Issaquena, Sharkey | 33 min |
| Mar 18, 3:07 PM CDT | Severe Thunderstorm Warning | SHV | Columbia, Union | 68 min |
| Mar 18, 3:10 PM CDT | Severe Thunderstorm Warning | JAN | Morehouse, Richland, West Carroll | 37 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, 6.6 hours before the alert went out and 73 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
- 11 J/kg
- Mixed-layer CIN
- -466 J/kg
- Mixed-layer LCL
- 489 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 191 m²/s²
- 0-3 km storm-relative helicity
- 245 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 18, 9:51 AM CDT | Mesoscale Discussion | SPC | Clark, Columbia, Garland, Hempstead, Hot Spring, Howard and 8 more | 84 min |
| Mar 18, 1:16 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Columbia, Drew and 7 more | 59 min |
| Mar 18, 3:47 PM CDT | Mesoscale Discussion | SPC | Ashley, Bradley, Calhoun, Chicot, Columbia, Drew and 7 more | 118 min |
| Mar 18, 10:40 AM CDT | Mesoscale Discussion | SPC | Ascension, Assumption, Jefferson, Lafourche, Orleans, Plaquemines and 7 more | 95 min |
| Mar 18, 6:04 AM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Collin, Cooke, Cottle and 10 more | 2 hr |
| Mar 18, 1:57 PM CDT | Mesoscale Discussion | SPC | Bandera, Crockett, Edwards, Gillespie, Kendall, Kerr and 8 more | 2 hr |
| Mar 18, 4:09 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 31 more | 7 hr |
| Mar 18, 6:05 PM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Bastrop, Bell, Bexar, Blanco and 23 more | 55 min |
Nearby
Severe Thunderstorm Watches in Louisiana, 2016Severe Thunderstorm Watches in Texas, 2016Severe Thunderstorm Watches in Arkansas, 2016Every severe thunderstorm watch in 2016
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.