Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 22

January 6, 20097 counties in Alabama; 7 counties in Florida; 16 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jan 6, 2009, 9:04 PM CST for 7 counties in Alabama; 7 counties in Florida; 16 counties in Georgia. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Jan 6, 2009, 9:04 PM CST (03:04 UTC)
Expired: Jan 6, 2009, 11:00 PM CST
In force: 116 min
Issued by: the Storm Prediction Center

All 30 counties

Barbour County, AL, Coffee County, AL, Covington County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Escambia County, FL, Holmes County, FL, Jackson County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Calhoun County, GA, Chattahoochee County, GA, Clay County, GA, Early County, GA, Lee County, GA, Marion County, GA, Miller County, GA, Quitman County, GA, Randolph County, GA, Schley County, GA, Seminole County, GA, Stewart County, GA, Sumter County, GA, Terrell County, GA, Webster County, GA

The watches that followed

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

Tornado Watch 5Jan 6, 10:50 PM CST

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 3.1 hours before the alert went out and 156 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: 201 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 470 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 242 m²/s²
0-3 km storm-relative helicity: 275 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.1

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
Jan 6, 7:02 PM CST	Mesoscale Discussion	SPC	Baldwin, Bullock, Butler, Chambers, Conecuh, Crenshaw and 4 more	118 min
Jan 6, 10:51 PM CST	Tornado Watch	SPC	Barbour, Bullock, Coffee, Covington, Crenshaw, Dale and 8 more	6 hr
Jan 7, 3:29 AM CST	Mesoscale Discussion	SPC	Baker, Bradford, Clay, Columbia, Dixie, Duval and 10 more	91 min
Jan 7, 1:32 AM CST	Mesoscale Discussion	SPC	Baker, Baldwin, Bibb, Bleckley, Calhoun, Clay and 42 more	118 min

Nearby

Mesoscale Discussions in Georgia, 2009 Mesoscale Discussions in Alabama, 2009 Mesoscale Discussions in Florida, 2009 Every mesoscale discussion in 2009

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.