Alert archive / Alabama / Mesoscale Discussions in 2005

Mesoscale Discussion 284

March 13, 200521 counties in Alabama; 9 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 13, 2005, 2:13 PM CST for 21 counties in Alabama; 9 counties in Mississippi. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Mar 13, 2005, 2:13 PM CST (20:13 UTC)
Expired: Mar 13, 2005, 4:15 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 30 counties

Autauga County, AL, Bibb County, AL, Calhoun County, AL, Chilton County, AL, Clay County, AL, Coosa County, AL, Elmore County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Choctaw County, MS, Clay County, MS, Kemper County, MS, Leake County, MS, Lowndes County, MS, Neshoba County, MS, Noxubee County, MS, Oktibbeha County, MS, Winston County, MS

The radar

The Columbus AFB radar (KGWX), 97 km from the middle of the area, began a volume at 20:13 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.

Severe Thunderstorm Watch 49Mar 13, 2:30 PM CST

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 8.2 hours before the alert went out and 105 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: 1476 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 293 m²/s²
0-3 km storm-relative helicity: 309 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
Mar 13, 2:30 PM CST	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Chilton, Greene, Hale, Jefferson and 5 more	8 hr
Mar 13, 4:28 PM CST	Mesoscale Discussion	SPC	Cleburne, Randolph	92 min
Mar 13, 1:50 PM CST	Mesoscale Discussion	SPC	Claiborne, Copiah, Hinds, Issaquena, Jefferson, Madison and 4 more	2 hr

Nearby

Mesoscale Discussions in Alabama, 2005 Mesoscale Discussions in Mississippi, 2005 Every mesoscale discussion in 2005

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.