Alert archive / Alabama / Severe Thunderstorm Watches in 2017

Severe Thunderstorm Watch 90

March 27, 20174 states

The Storm Prediction Center issued this severe thunderstorm watch at Mar 27, 2017, 1:54 PM CDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
Mar 27, 2017, 1:54 PM CDT (18:54 UTC)
Expired
Mar 27, 2017, 9:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2.5 in
Strongest gust expected
60 kt
All 66 counties

Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Cleburne County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Fayette County, AL, Franklin County, AL, Greene County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Chicot County, AR, East Carroll Parish, LA, Madison Parish, LA, West Carroll Parish, LA, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Clay County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Leflore County, MS, Lowndes County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS

The radar

The Columbus AFB radar (KGWX), 35 km from the middle of the area, began a volume at 18:57 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
10%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
40%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Mar 27, 1:57 PM CDTSevere Thunderstorm WarningJANNeshoba, Winston48 min
Mar 27, 2:03 PM CDTSevere Thunderstorm WarningHUNColbert, Franklin, Lauderdale42 min
Mar 27, 2:25 PM CDTSevere Thunderstorm WarningJANHinds, Rankin50 min
Mar 27, 2:31 PM CDTSevere Thunderstorm WarningHUNMarshall44 min
Mar 27, 2:37 PM CDTSevere Thunderstorm WarningHUNLauderdale23 min
Mar 27, 2:56 PM CDTSevere Thunderstorm WarningJANNeshoba, Winston49 min
Mar 27, 3:04 PM CDTSevere Thunderstorm WarningHUNFranklin41 min
Mar 27, 3:13 PM CDTSevere Thunderstorm WarningJANEast Carroll47 min
Mar 27, 3:17 PM CDTSevere Thunderstorm WarningHUNJackson43 min
Mar 27, 3:26 PM CDTSevere Thunderstorm WarningBMXCherokee34 min
Mar 27, 3:28 PM CDTSevere Thunderstorm WarningJANFranklin, Madison, Tensas23 min
Mar 27, 3:30 PM CDTSevere Thunderstorm WarningHUNColbert, Franklin45 min
Mar 27, 3:30 PM CDTSevere Thunderstorm WarningJANKemper, Neshoba, Noxubee60 min
Mar 27, 3:31 PM CDTTornado WarningHUNFranklin29 min
Mar 27, 3:43 PM CDTSevere Thunderstorm WarningJANScott47 min
Mar 27, 3:48 PM CDTSevere Thunderstorm WarningJANEast Carroll42 min
Mar 27, 3:51 PM CDTSevere Thunderstorm WarningJANLeake, Neshoba69 min
Mar 27, 3:52 PM CDTSevere Thunderstorm WarningHUNColbert, Franklin, Lawrence38 min
Mar 27, 4:08 PM CDTTornado WarningHUNFranklin13 min
Mar 27, 4:11 PM CDTSevere Thunderstorm WarningHUNLawrence, Limestone, Morgan49 min
Mar 27, 4:20 PM CDTSevere Thunderstorm WarningBMXMarion25 min
Mar 27, 4:24 PM CDTSevere Thunderstorm WarningJANNewton, Scott68 min
Mar 27, 4:25 PM CDTSevere Thunderstorm WarningHUNFranklin, Lawrence34 min
Mar 27, 4:26 PM CDTSevere Thunderstorm WarningHUNLimestone, Madison49 min
Mar 27, 4:29 PM CDTSevere Thunderstorm WarningBMXWalker31 min
Mar 27, 4:36 PM CDTSevere Thunderstorm WarningHUNCullman39 min
Mar 27, 4:41 PM CDTSevere Thunderstorm WarningBMXMarion49 min
Mar 27, 4:51 PM CDTSevere Thunderstorm WarningHUNLimestone, Madison24 min
Mar 27, 4:53 PM CDTSevere Thunderstorm WarningJANKemper, Noxubee67 min
Mar 27, 5:11 PM CDTSevere Thunderstorm WarningHUNCullman34 min
Mar 27, 5:15 PM CDTSevere Thunderstorm WarningJANJasper, Newton45 min
Mar 27, 5:35 PM CDTSevere Thunderstorm WarningBMXBlount55 min
Mar 27, 5:35 PM CDTSevere Thunderstorm WarningJANClaiborne, Warren40 min
Mar 27, 5:54 PM CDTSevere Thunderstorm WarningBMXSt. Clair36 min
Mar 27, 5:55 PM CDTSevere Thunderstorm WarningBMXBlount50 min
Mar 27, 6:01 PM CDTSevere Thunderstorm WarningBMXMarion, Winston44 min
Mar 27, 6:12 PM CDTSevere Thunderstorm WarningJANClaiborne, Copiah, Hinds, Warren48 min
Mar 27, 6:14 PM CDTSevere Thunderstorm WarningHUNLawrence46 min
Mar 27, 6:19 PM CDTSevere Thunderstorm WarningBMXEtowah56 min
Mar 27, 6:44 PM CDTSevere Thunderstorm WarningJANCopiah, Hinds, Madison, Rankin61 min
Mar 27, 6:47 PM CDTSevere Thunderstorm WarningHUNDeKalb43 min
Mar 27, 7:05 PM CDTSevere Thunderstorm WarningHUNMarshall10 min
Mar 27, 7:12 PM CDTSevere Thunderstorm WarningBMXCherokee, Etowah63 min
Mar 27, 7:22 PM CDTSevere Thunderstorm WarningBMXJefferson38 min
Mar 27, 7:25 PM CDTSevere Thunderstorm WarningJANLeake, Madison, Rankin, Scott, Smith65 min
Mar 27, 8:31 PM CDTSevere Thunderstorm WarningHUNColbert, Lauderdale59 min
Mar 27, 8:46 PM CDTSevere Thunderstorm WarningBMXCherokee, Etowah29 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 12:00Z, 6.9 hours before the alert went out and 132 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 12:00Z on 2017-03-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 293 joules per kilogram.LCLLFCEL10008507005003002001001 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 12:00Z on 2017-03-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 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
293 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
734 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
107 m²/s²
0-3 km storm-relative helicity
84 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 27, 1:49 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Chilton, Coosa and 19 more56 min
Mar 27, 3:33 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Chilton, Clay and 26 more87 min
Mar 27, 5:59 PM CDTMesoscale DiscussionSPCLauderdale91 min
Mar 26, 8:49 PM CDTSevere Thunderstorm WatchSPCCrawford, Franklin, Howard, Little River, Logan, Miller and 4 more6 hr
Mar 27, 12:44 AM CDTMesoscale DiscussionSPCGarland, Hempstead, Howard, Lafayette, Little River, Logan and 8 more61 min
Mar 27, 11:26 AM CDTMesoscale DiscussionSPCClay, Craighead, Greene, Mississippi, Poinsett3 hr
Mar 27, 12:08 PM CDTSevere Thunderstorm WatchSPCCraighead, Crittenden, Cross, Lee, Mississippi, Phillips and 2 more8 hr
Mar 27, 3:39 PM CDTMesoscale DiscussionSPCCraighead, Crittenden, Cross, Lee, Mississippi, Phillips and 2 more2 hr
Mar 27, 12:12 PM CDTMesoscale DiscussionSPCEast Carroll, Madison2 hr

Nearby

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