Alert archive / Alabama / Mesoscale Discussions in 2017

Mesoscale Discussion 273

March 7, 201718 counties in Alabama; 18 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 7, 2017, 1:40 PM CST for 18 counties in Alabama; 18 counties in Mississippi. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Mar 7, 2017, 1:40 PM CST (19:40 UTC)
Expired: Mar 7, 2017, 2:45 PM CST
In force: 65 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

All 36 counties

Bibb County, AL, Blount County, AL, Chilton County, AL, Choctaw County, AL, Cullman County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Clarke County, MS, Copiah County, MS, Covington County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lauderdale County, MS, Lawrence County, MS, Lincoln County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Wayne County, MS

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 7.7 hours before the alert went out and 147 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1069 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 316 m²/s²
0-3 km storm-relative helicity: 327 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 7, 2:58 AM CST	Mesoscale Discussion	SPC	Benton, Bolivar, Calhoun, Carroll, Coahoma, DeSoto and 16 more	92 min
Mar 7, 3:37 AM CST	Severe Thunderstorm Watch	SPC	Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 33 more	8 hr
Mar 7, 8:03 AM CST	Mesoscale Discussion	SPC	Alcorn, Attala, Benton, Bolivar, Calhoun, Carroll and 33 more	117 min
Mar 7, 11:02 AM CST	Mesoscale Discussion	SPC	Adams, Attala, Calhoun, Carroll, Chickasaw, Choctaw and 27 more	58 min

Nearby

Mesoscale Discussions in Alabama, 2017 Mesoscale Discussions in Mississippi, 2017 Every mesoscale discussion 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.