Alert archive / Louisiana / Tornado Watches in 2020
Tornado Watch 138
The Storm Prediction Center issued this tornado watch at Apr 23, 2020, 12:02 AM CDT for 11 parishes in Louisiana. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 23, 2020, 12:02 AM CDT (05:02 UTC)
- Expired
- Apr 23, 2020, 4:00 AM CDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA
The radar
The Ft Polk radar (KPOE), 78 km from the middle of the area, began a volume at 05:00 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
- 30%
- Ten or more severe wind reports
- 40%
- 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
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 12:33 AM CDT | Severe Thunderstorm Warning | LCH | Allen, Calcasieu, Jefferson Davis | 57 min |
| Apr 23, 1:02 AM CDT | Tornado Warning | LCH | Avoyelles, Evangeline, Rapides | 43 min |
| Apr 23, 1:24 AM CDT | Severe Thunderstorm Warning | LCH | Acadia, Allen, Evangeline, Jefferson Davis, Saint Landry | 50 min |
| Apr 23, 1:52 AM CDT | Tornado Warning | LCH | Acadia, Saint Landry | 42 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, 5.0 hours before the alert went out and 121 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
- 2355 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 548 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 220 m²/s²
- 0-3 km storm-relative helicity
- 302 m²/s²
- Significant tornado parameter
- 4.7
- Supercell composite
- 15.7
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 7:01 PM CDT | Mesoscale Discussion | SPC | Beauregard, Vernon | 89 min |
| Apr 22, 7:41 PM CDT | Mesoscale Discussion | SPC | Vernon | 34 min |
| Apr 22, 8:26 PM CDT | Mesoscale Discussion | SPC | De Soto, Natchitoches, Sabine | 94 min |
| Apr 22, 9:31 PM CDT | Mesoscale Discussion | SPC | Avoyelles, Concordia, East Feliciana, Pointe Coupee, Saint Helena, Washington and 1 more | 89 min |
| Apr 22, 9:47 PM CDT | Tornado Watch | SPC | Ascension, Catahoula, Concordia, East Baton Rouge, East Feliciana, Franklin and 12 more | 9 hr |
| Apr 22, 10:17 PM CDT | Mesoscale Discussion | SPC | Caldwell, Grant, LaSalle, Natchitoches, Sabine, Winn | 88 min |
| Apr 22, 11:16 PM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Caldwell and 15 more | 89 min |
| Apr 23, 2:28 AM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Avoyelles, Concordia, East Baton Rouge, East Feliciana and 17 more | 92 min |
| Apr 23, 1:37 PM CDT | Mesoscale Discussion | SPC | Ascension, East Baton Rouge, East Feliciana, Iberville, Livingston, Saint Helena and 3 more | 113 min |
Nearby
Tornado Watches in Louisiana, 2020Every tornado watch in 2020
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.