Alert archive / Louisiana / Severe Thunderstorm Watches in 2017
Severe Thunderstorm Watch 296
The Storm Prediction Center issued this severe thunderstorm watch at May 28, 2017, 7:08 PM CDT for 16 parishes in Louisiana; 11 counties in Mississippi; 5 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 28, 2017, 7:08 PM CDT (00:08 UTC)
- Expired
- May 29, 2017, 1:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 32 counties
Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Jefferson Davis Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, Vernon Parish, LA, West Feliciana Parish, LA, Adams County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Simpson County, MS, Wilkinson County, MS, Hardin County, TX, Jasper County, TX, Newton County, TX, Orange County, TX, Tyler County, TX
The radar
The Ft Polk radar (KPOE), 30 km from the middle of the area, began a volume at 00:12 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
- 20%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 70%
Warnings issued inside it
6 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 7:19 PM CDT | Severe Thunderstorm Warning | LCH | Beauregard, Rapides, Vernon | 56 min |
| May 28, 7:58 PM CDT | Tornado Warning | LCH | Vernon | 19 min |
| May 28, 8:15 PM CDT | Severe Thunderstorm Warning | LCH | Allen, Evangeline, Rapides, Vernon | 60 min |
| May 28, 9:10 PM CDT | Severe Thunderstorm Warning | JAN | Catahoula, Franklin | 50 min |
| May 28, 9:11 PM CDT | Severe Thunderstorm Warning | LCH | Acadia, Allen, Avoyelles, Evangeline, Rapides, Saint Landry | 64 min |
| May 28, 9:37 PM CDT | Severe Thunderstorm Warning | JAN | Tensas | 68 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 00:00Z, 0.1 hours before the alert went out and 95 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
- 2055 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 992 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 27 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 28, 7:34 PM CDT | Mesoscale Discussion | SPC | Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more | 56 min |
| May 28, 9:16 PM CDT | Mesoscale Discussion | SPC | Allen, Avoyelles, Beauregard, Calcasieu, Catahoula, Concordia and 9 more | 59 min |
| May 28, 7:19 PM CDT | Mesoscale Discussion | SPC | Duval, Jim Hogg, La Salle, Live Oak, McMullen, Webb and 1 more | 56 min |
| May 28, 7:40 PM CDT | Severe Thunderstorm Watch | SPC | Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 10 more | 8 hr |
| May 28, 9:41 PM CDT | Mesoscale Discussion | SPC | Brooks, Duval, Jim Hogg, Jim Wells, La Salle, Live Oak and 3 more | 64 min |
| May 29, 2:02 AM CDT | Mesoscale Discussion | SPC | Aransas, Brooks, Cameron, Duval, Hidalgo, Jim Wells and 6 more | 118 min |
Nearby
Severe Thunderstorm Watches in Louisiana, 2017Severe Thunderstorm Watches in Mississippi, 2017Severe Thunderstorm Watches in Texas, 2017Every severe thunderstorm watch in 2017
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.