Alert archive / Alabama / Mesoscale Discussions in 2014

Mesoscale Discussion 304

April 6, 201416 counties in Alabama; 4 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2014, 11:42 PM CDT for 16 counties in Alabama; 4 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 6, 2014, 11:42 PM CDT (04:42 UTC)
Expired: Apr 7, 2014, 1:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Autauga County, AL, Bibb County, AL, Chilton County, AL, Coosa County, AL, Dallas County, AL, Elmore County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, Sumter County, AL, Talladega County, AL, Tuscaloosa County, AL, Kemper County, MS, Leake County, MS, Neshoba County, MS, Noxubee County, MS

The radar

The Birmingham radar (KBMX), 77 km from the middle of the area, began a volume at 04:43 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.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 66Apr 7, 1:15 AM CDT

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 4.7 hours before the alert went out and 77 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: 630 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 634 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 6, 8:02 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Chilton, Coosa, Dallas, Elmore and 14 more	118 min
Apr 6, 10:10 PM CDT	Mesoscale Discussion	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 8 more	2 hr
Apr 7, 12:50 AM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Bullock, Butler, Chambers and 32 more	25 min
Apr 7, 1:16 AM CDT	Tornado Watch	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 37 more	7 hr
Apr 7, 3:16 AM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 25 more	119 min
Apr 7, 5:42 AM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 40 more	2 hr
Apr 7, 7:46 AM CDT	Tornado Watch	SPC	Baldwin, Barbour, Bullock, Butler, Coffee, Conecuh and 12 more	7 hr
Apr 7, 10:04 AM CDT	Mesoscale Discussion	SPC	Dale, Geneva, Henry, Houston	116 min
Apr 6, 11:49 PM CDT	Mesoscale Discussion	SPC	Amite, Covington, Forrest, Jasper, Jefferson Davis, Jones and 8 more	86 min

Nearby

Mesoscale Discussions in Alabama, 2014 Mesoscale Discussions in Mississippi, 2014 Every mesoscale discussion in 2014

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.