Alert archive / Mississippi / Tornado Watches in 2019

Tornado Watch 157

May 9, 2019Choctaw County, Mobile County, Washington County, Alabama; 10 parishes in Louisiana; 16 counties in Mississippi

The Storm Prediction Center issued this tornado watch at May 9, 2019, 11:46 AM CDT for Choctaw County, Mobile County, Washington County, Alabama; 10 parishes in Louisiana; 16 counties in Mississippi. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 9, 2019, 11:46 AM CDT (16:46 UTC)
Expired
May 9, 2019, 5:30 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 29 counties

Choctaw County, AL, Mobile County, AL, Washington County, AL, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Saint Helena Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Amite County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS, Wilkinson County, MS

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
30%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
10%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

16 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 9, 11:53 AM CDTSevere Thunderstorm WarningLIXTangipahoa, Washington67 min
May 9, 11:58 AM CDTSevere Thunderstorm WarningLIXLivingston, Tangipahoa62 min
May 9, 12:01 PM CDTTornado WarningLIXTangipahoa, Washington23 min
May 9, 12:05 PM CDTSevere Thunderstorm WarningLIXWalthall40 min
May 9, 12:09 PM CDTSevere Thunderstorm WarningLIXEast Feliciana, Saint Helena36 min
May 9, 12:32 PM CDTSevere Thunderstorm WarningJANCovington, Forrest, Jefferson Davis, Jones, Lamar, Marion58 min
May 9, 12:34 PM CDTSevere Thunderstorm WarningMOBChoctaw56 min
May 9, 12:36 PM CDTSevere Thunderstorm WarningLIXSaint Helena, Tangipahoa54 min
May 9, 12:40 PM CDTTornado WarningLIXTangipahoa33 min
May 9, 12:54 PM CDTSevere Thunderstorm WarningLIXWashington36 min
May 9, 1:26 PM CDTSevere Thunderstorm WarningJANForrest, Jones, Lamar64 min
May 9, 1:51 PM CDTSevere Thunderstorm WarningLIXTangipahoa39 min
May 9, 2:06 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Washington54 min
May 9, 2:52 PM CDTFlash Flood WarningLIXEast Baton Rouge, East Feliciana, Livingston, Saint Helena3 hr
May 9, 3:30 PM CDTFlash Flood WarningLIXLivingston, Saint Tammany, Tangipahoa, Washington6 hr
May 9, 3:59 PM CDTFlash Flood WarningLIXAscension, East Baton Rouge, Iberville, Livingston, West Baton Rouge8 hr

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 12:00Z, 4.8 hours before the alert went out and 74 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.

Skew-T log-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 2019-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1983 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2019-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 138 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1983 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
541 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
138 m²/s²
0-3 km storm-relative helicity
273 m²/s²
Significant tornado parameter
1.6
Supercell composite
8.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 11:22 AM CDTMesoscale DiscussionSPCChoctaw, Clarke, Greene, Hale, Marengo, Sumter and 2 more113 min
May 9, 12:03 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 20 more57 min
May 9, 1:34 PM CDTMesoscale DiscussionSPCBaldwin, Choctaw, Clarke, Conecuh, Escambia, Mobile and 3 more116 min
May 9, 1:47 PM CDTMesoscale DiscussionSPCCalhoun, Cherokee, Cleburne, DeKalb, Etowah, Jackson88 min
May 9, 3:35 PM CDTMesoscale DiscussionSPCBaldwin, Barbour, Bullock, Butler, Coffee, Conecuh and 10 more115 min
May 8, 7:02 PM CDTMesoscale DiscussionSPCCatahoula, East Carroll, Franklin, Madison, Morehouse, Richland and 2 more58 min
May 8, 10:31 PM CDTMesoscale DiscussionSPCBeauregard, Bienville, Bossier, Caddo, Caldwell, Claiborne and 13 more89 min
May 9, 6:58 AM CDTMesoscale DiscussionSPCCatahoula, Franklin, Grant, LaSalle, Madison, Rapides and 1 more62 min
May 8, 9:28 PM CDTMesoscale DiscussionSPCAttala, Carroll, Copiah, Grenada, Hinds, Holmes and 12 more62 min
May 9, 8:09 AM CDTSevere Thunderstorm WatchSPCAdams, Attala, Claiborne, Clarke, Copiah, Covington and 20 more6 hr

Nearby

Tornado Watches in Mississippi, 2019Tornado Watches in Louisiana, 2019Tornado Watches in Alabama, 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.