Alert archive / Louisiana / Tornado Watches in 2020
Tornado Watch 124
The Storm Prediction Center issued this tornado watch at Apr 19, 2020, 9:39 PM CDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 19, 2020, 9:39 PM CDT (02:39 UTC)
- Expired
- Apr 20, 2020, 2:55 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
All 37 counties
Baldwin County, AL, Butler County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Ascension Parish, LA, Assumption Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS
The radar
The Mobile radar (KMOB), 24 km from the middle of the area, began a volume at 02:42 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
- 50%
- One or more EF2 to EF5 tornadoes
- 40%
- Ten or more severe wind reports
- 70%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 90%
Warnings issued inside it
28 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 9:41 PM CDT | Severe Thunderstorm Warning | LIX | Livingston, Saint Tammany, Tangipahoa | 34 min |
| Apr 19, 9:42 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin, Clarke, Escambia, Mobile | 19 min |
| Apr 19, 9:50 PM CDT | Tornado Warning | LIX | Hancock, Pearl River | 25 min |
| Apr 19, 10:12 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 33 min |
| Apr 19, 10:35 PM CDT | Severe Thunderstorm Warning | MOB | Conecuh, Covington, Escambia | 25 min |
| Apr 19, 10:38 PM CDT | Severe Thunderstorm Warning | MOB | Mobile | 52 min |
| Apr 19, 10:38 PM CDT | Severe Thunderstorm Warning | LIX | Jackson | 54 min |
| Apr 19, 10:40 PM CDT | Severe Thunderstorm Warning | MOB | Covington, Crenshaw | 35 min |
| Apr 19, 10:41 PM CDT | Severe Thunderstorm Warning | LIX | Hancock, Harrison | 34 min |
| Apr 19, 10:47 PM CDT | Tornado Warning | MOB | Covington | 28 min |
| Apr 19, 10:54 PM CDT | Severe Thunderstorm Warning | MOB | Mobile | 51 min |
| Apr 19, 10:54 PM CDT | Severe Thunderstorm Warning | MOB | Covington | 36 min |
| Apr 19, 10:56 PM CDT | Severe Thunderstorm Warning | LIX | Saint Tammany | 34 min |
| Apr 19, 11:03 PM CDT | Tornado Warning | MOB | Mobile | 27 min |
| Apr 19, 11:07 PM CDT | Tornado Warning | MOB | Mobile | 38 min |
| Apr 19, 11:14 PM CDT | Severe Thunderstorm Warning | MOB | Baldwin | 61 min |
| Apr 19, 11:26 PM CDT | Tornado Warning | MOB | Baldwin | 29 min |
| Apr 19, 11:29 PM CDT | Tornado Warning | MOB | Baldwin | 31 min |
| Apr 19, 11:41 PM CDT | Severe Thunderstorm Warning | MOB | Escambia | 34 min |
| Apr 19, 11:43 PM CDT | Severe Thunderstorm Warning | MOB | Mobile | 47 min |
| Apr 19, 11:45 PM CDT | Tornado Warning | MOB | Baldwin | 30 min |
| Apr 19, 11:55 PM CDT | Severe Thunderstorm Warning | MOB | Okaloosa | 15 min |
| Apr 19, 11:58 PM CDT | Severe Thunderstorm Warning | MOB | Okaloosa | 62 min |
| Apr 20, 12:01 AM CDT | Tornado Warning | MOB | Escambia, Santa Rosa | 29 min |
| Apr 20, 12:05 AM CDT | Severe Thunderstorm Warning | MOB | Conecuh, Covington, Escambia | 40 min |
| Apr 20, 12:10 AM CDT | Severe Thunderstorm Warning | MOB | Baldwin | 50 min |
| Apr 20, 12:28 AM CDT | Severe Thunderstorm Warning | MOB | Mobile | 28 min |
| Apr 20, 12:54 AM CDT | Severe Thunderstorm Warning | MOB | Baldwin | 66 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
Slidell Radar S, LA (KSIL), launched 00:00Z, 2.7 hours before the alert went out and 140 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
- 2097 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 819 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 202 m²/s²
- 0-3 km storm-relative helicity
- 227 m²/s²
- Significant tornado parameter
- 2.5
- Supercell composite
- 9.5
The text
As transmitted.
051 WWUS20 KWNS 200233 SEL4 SPC WW 200233 ALZ000-FLZ000-LAZ000-MSZ000-CWZ000-200900- URGENT - IMMEDIATE BROADCAST REQUESTED Tornado Watch Number 124 NWS Storm Prediction Center Norman OK 935 PM CDT Sun Apr 19 2020 The NWS Storm Prediction Center has issued a * Tornado Watch for portions of Southern Alabama Florida Panhandle Southeast Louisiana Southeast Mississippi Coastal Waters * Effective this Sunday night and Monday morning from 935 PM until 400 AM CDT. * Primary threats include... A few tornadoes and a couple intense tornadoes possible Scattered damaging wind gusts to 70 mph likely Isolated large hail events to 1.5 inches in diameter possible SUMMARY...Clusters of storms including bowing segments and a few semi-discrete supercells will cross the region late this evening into the overnight. Damaging winds will be the most common severe risk, but a few tornadoes could occur, potentially including a strong/intense tornado risk given the increasing low-level shear/SRH. The tornado watch area is approximately along and 65 statute miles north and south of a line from 35 miles north northeast of Crestview FL to 35 miles west northwest of Houma LA. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU4). 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. && OTHER WATCH INFORMATION...CONTINUE...WW 122...WW 123... AVIATION...Tornadoes and a few severe thunderstorms with hail surface and aloft to 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 600. Mean storm motion vector 26040. ...Guyer
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 8:25 PM CDT | Mesoscale Discussion | SPC | Barbour, Bullock, Crenshaw, Dale, Henry, Macon and 3 more | 65 min |
| Apr 19, 9:07 PM CDT | Mesoscale Discussion | SPC | Mobile | 83 min |
| Apr 19, 9:53 PM CDT | Mesoscale Discussion | SPC | Dale, Geneva, Henry, Houston | 67 min |
| Apr 19, 10:13 PM CDT | Tornado Watch | SPC | Barbour, Coffee, Dale, Geneva, Henry, Houston and 1 more | 10 hr |
| Apr 20, 12:52 AM CDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 6 more | 83 min |
| Apr 20, 1:19 AM CDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 9 more | 9 hr |
| Apr 20, 5:19 AM CDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 16 more | 86 min |
| Apr 20, 6:02 AM CDT | Severe Thunderstorm Watch | SPC | Brevard, Citrus, Hardee, Hernando, Hillsborough, Lake and 11 more | 8 hr |
| Apr 20, 7:18 AM CDT | Mesoscale Discussion | SPC | Alachua, Citrus, Flagler, Levy, Marion, Putnam and 2 more | 87 min |
| Apr 20, 10:06 AM CDT | Mesoscale Discussion | SPC | Brevard, Hardee, Hernando, Hillsborough, Indian River, Lake and 10 more | 114 min |
| Apr 20, 1:00 PM CDT | Mesoscale Discussion | SPC | DeSoto, Hardee, Highlands, Indian River, Manatee, Okeechobee and 4 more | 90 min |
| Apr 19, 7:42 PM CDT | Mesoscale Discussion | SPC | Forrest, Greene, Lamar, Perry | 33 min |
Nearby
Tornado Watches in Louisiana, 2020Tornado Watches in Alabama, 2020Tornado Watches in Mississippi, 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.