Alert archive / Mississippi / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 75

March 9, 201716 counties in Alabama; 13 counties in Georgia; 17 counties in Mississippi

The Storm Prediction Center issued this severe thunderstorm watch at Mar 9, 2017, 11:18 PM CST for 16 counties in Alabama; 13 counties in Georgia; 17 counties in Mississippi. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Mar 9, 2017, 11:18 PM CST (05:18 UTC)
Expired
Mar 10, 2017, 3:05 AM CST
In force
4 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 46 counties

Blount County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Franklin County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Winston County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Cherokee County, GA, Dade County, GA, Fannin County, GA, Floyd County, GA, Gilmer County, GA, Gordon County, GA, Murray County, GA, Pickens County, GA, Walker County, GA, Whitfield County, GA, Alcorn County, MS, Benton County, MS, Coahoma County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS

What SPC expected

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

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

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Mar 9, 11:18 PM CSTSevere Thunderstorm WarningMEGItawamba, Lee25 min
Mar 9, 11:46 PM CSTSevere Thunderstorm WarningMEGBenton, DeSoto, Marshall44 min
Mar 9, 11:49 PM CSTSevere Thunderstorm WarningBMXMarion41 min
Mar 9, 11:50 PM CSTSevere Thunderstorm WarningHUNColbert, Lauderdale, Lawrence, Limestone, Madison55 min
Mar 9, 11:55 PM CSTSevere Thunderstorm WarningHUNJackson, Madison65 min
Mar 9, 11:58 PM CSTSevere Thunderstorm WarningMEGDeSoto, Marshall, Tate32 min
Mar 10, 12:05 AM CSTSevere Thunderstorm WarningMEGItawamba11 min
Mar 10, 12:07 AM CSTSevere Thunderstorm WarningBMXMarion31 min
Mar 10, 12:13 AM CSTTornado WarningMEGMarshall, Tate15 min
Mar 10, 12:18 AM CSTSevere Thunderstorm WarningBMXWinston57 min
Mar 10, 12:21 AM CSTSevere Thunderstorm WarningMEGBenton, Lafayette, Marshall, Panola, Tate, Tippah and 1 more39 min
Mar 10, 12:27 AM CSTSevere Thunderstorm WarningHUNDeKalb, Jackson49 min
Mar 10, 12:36 AM CSTSevere Thunderstorm WarningFFCCatoosa, Chattooga, Dade, Walker39 min
Mar 10, 12:44 AM CSTSevere Thunderstorm WarningMEGCalhoun, Chickasaw, Lafayette, Lee, Pontotoc, Prentiss and 3 more46 min
Mar 10, 12:45 AM CSTSevere Thunderstorm WarningHUNMadison, Marshall, Morgan30 min
Mar 10, 12:47 AM CSTSevere Thunderstorm WarningHUNCullman, Morgan58 min
Mar 10, 1:14 AM CSTSevere Thunderstorm WarningHUNCullman, DeKalb, Jackson, Marshall, Morgan36 min
Mar 10, 2:28 AM CSTSevere Thunderstorm WarningFFCCherokee, Forsyth, Gwinnett, Hall32 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

Birmingham, AL (KBMX), launched 00:00Z, 5.3 hours before the alert went out and 171 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, Birmingham, AL at 00:00Z on 2017-03-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Birmingham, AL at 00:00Z on 2017-03-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2156 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
57 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 9, 6:39 PM CSTMesoscale DiscussionSPCFayette, Greene, Lamar, Marion, Pickens, Sumter96 min
Mar 9, 10:42 PM CSTMesoscale DiscussionSPCBlount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 10 more63 min
Mar 10, 12:50 AM CSTMesoscale DiscussionSPCBlount, Cherokee, Colbert, Cullman, DeKalb, Etowah and 12 more85 min
Mar 10, 3:09 AM CSTMesoscale DiscussionSPCChambers, Clay, Cleburne, Coosa, Randolph, Shelby and 3 more96 min

Nearby

Severe Thunderstorm Watches in Mississippi, 2017Severe Thunderstorm Watches in Alabama, 2017Severe Thunderstorm Watches in Georgia, 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.