Alert archive / Alabama / Mesoscale Discussions in 2007

Mesoscale Discussion 2270

December 28, 200728 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida

The Storm Prediction Center issued this mesoscale discussion at Dec 28, 2007, 3:07 PM CST for 28 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: Dec 28, 2007, 3:07 PM CST (21:07 UTC)
Expired: Dec 28, 2007, 4:30 PM CST
In force: 83 min
Issued by: the Storm Prediction Center

All 31 counties

Autauga County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coffee County, AL, Conecuh County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, Elmore County, AL, Escambia County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Monroe County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 9.1 hours before the alert went out and 133 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: 463 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 361 m²/s²
0-3 km storm-relative helicity: 429 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

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
Dec 28, 2:13 AM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Butler, Chilton, Choctaw, Clarke and 14 more	92 min
Dec 28, 10:44 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Barbour, Bibb, Blount, Bullock and 36 more	7 hr
Dec 28, 12:17 PM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Bullock, Butler, Calhoun and 30 more	118 min

Nearby

Mesoscale Discussions in Alabama, 2007 Mesoscale Discussions in Florida, 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.