Alert archive / Alabama / Mesoscale Discussions in 2007

Mesoscale Discussion 157

February 13, 200727 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Feb 13, 2007, 5:09 PM CST for 27 counties in Alabama. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Feb 13, 2007, 5:09 PM CST (23:09 UTC)
Expired: Feb 13, 2007, 6:45 PM CST
In force: 96 min
Issued by: the Storm Prediction Center

All 27 counties

Autauga County, AL, Bibb County, AL, Blount County, AL, Bullock County, AL, Butler County, AL, Chilton County, AL, Clay County, AL, Coosa County, AL, Cullman County, AL, Dallas County, AL, Elmore County, AL, Hale County, AL, Jefferson County, AL, Lawrence County, AL, Lowndes County, AL, Macon County, AL, Montgomery County, AL, Morgan County, AL, Perry County, AL, Pike County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL

The radar

The Birmingham radar (KBMX), 4 km from the middle of the area, began a volume at 23:10 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 nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 11.2 hours before the alert went out and 5 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: 837 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 263 m²/s²
0-3 km storm-relative helicity: 315 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
Feb 13, 2:05 AM CST	Mesoscale Discussion	SPC	Mobile, Washington	55 min
Feb 13, 2:43 AM CST	Tornado Watch	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more	10 hr
Feb 13, 4:50 AM CST	Mesoscale Discussion	SPC	Dallas, Greene, Hale, Marengo, Perry, Sumter	85 min
Feb 13, 5:26 AM CST	Mesoscale Discussion	SPC	Mobile, Washington	94 min
Feb 13, 7:24 AM CST	Mesoscale Discussion	SPC	Baldwin, Conecuh, Escambia, Mobile, Monroe	96 min
Feb 13, 9:07 AM CST	Tornado Watch	SPC	Coffee, Dale, Geneva, Henry, Houston	7 hr
Feb 13, 11:03 AM CST	Mesoscale Discussion	SPC	Colbert, Franklin, Lamar, Marion	87 min
Feb 13, 12:08 PM CST	Mesoscale Discussion	SPC	Coffee, Dale, Geneva, Henry, Houston	67 min
Feb 13, 12:49 PM CST	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Blount, Chilton, Colbert, Cullman and 21 more	6 hr
Feb 13, 5:18 PM CST	Tornado Watch	SPC	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 29 more	4 hr

Nearby

Mesoscale Discussions in Alabama, 2007 Every mesoscale discussion in 2007

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.