Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 436

April 10, 200910 counties in Alabama; 19 counties in Georgia; Polk County, Tennessee

The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2009, 3:43 PM CDT for 10 counties in Alabama; 19 counties in Georgia; Polk County, Tennessee. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Apr 10, 2009, 3:43 PM CDT (20:43 UTC)
Expired: Apr 10, 2009, 5:15 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

All 30 counties

Blount County, AL, Calhoun County, AL, Cherokee County, AL, Cleburne County, AL, DeKalb County, AL, Etowah County, AL, Jefferson County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Bartow County, GA, Carroll County, GA, Chattooga County, GA, Cherokee County, GA, Cobb County, GA, Dawson County, GA, Douglas County, GA, Fannin County, GA, Floyd County, GA, Fulton County, GA, Gilmer County, GA, Gordon County, GA, Haralson County, GA, Murray County, GA, Paulding County, GA, Pickens County, GA, Polk County, GA, Walker County, GA, Whitfield County, GA, Polk County, TN

The radar

The Northeast Alabama radar (KHTX), 110 km from the middle of the area, began a volume at 20:44 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.7 hours before the alert went out and 116 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: 671 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 256 m²/s²
0-3 km storm-relative helicity: 292 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 10, 1:24 AM CDT	Mesoscale Discussion	SPC	Colbert, Fayette, Franklin, Lamar, Lauderdale, Marion and 1 more	96 min
Apr 10, 1:43 AM CDT	Tornado Watch	SPC	Blount, Colbert, Cullman, Fayette, Franklin, Greene and 12 more	5 hr
Apr 10, 4:25 AM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Cleburne, Cullman, DeKalb and 13 more	95 min
Apr 10, 8:22 AM CDT	Mesoscale Discussion	SPC	Lauderdale	83 min
Apr 10, 11:14 AM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Jackson, Lauderdale, Lawrence, Limestone and 4 more	76 min
Apr 10, 11:23 AM CDT	Tornado Watch PDS	SPC	Bibb, Blount, Calhoun, Cherokee, Cleburne, Colbert and 25 more	8 hr
Apr 10, 12:58 PM CDT	Mesoscale Discussion	SPC	Colbert, Cullman, Fayette, Franklin, Jackson, Lamar and 8 more	92 min
Apr 10, 2:29 PM CDT	Mesoscale Discussion	SPC	Cleburne	91 min
Apr 10, 2:39 PM CDT	Tornado Watch PDS	SPC	Autauga, Barbour, Bullock, Calhoun, Chambers, Cherokee and 19 more	8 hr
Apr 10, 6:34 PM CDT	Mesoscale Discussion	SPC	Autauga, Calhoun, Chambers, Chilton, Clay, Cleburne and 9 more	56 min
Apr 10, 7:04 AM CDT	Mesoscale Discussion	SPC	Banks, Bartow, Chattooga, Cherokee, Cobb, Dawson and 23 more	86 min
Apr 10, 5:11 PM CDT	Mesoscale Discussion	SPC	Baldwin, Bibb, Butts, Clarke, Columbia, Crawford and 32 more	64 min
Apr 10, 5:31 PM CDT	Tornado Watch	SPC	Baldwin, Bibb, Bleckley, Butts, Chattahoochee, Columbia and 53 more	7 hr
Apr 9, 10:48 PM CDT	Tornado Watch	SPC	Crockett, Dyer, Fayette, Gibson, Haywood, Lake and 4 more	4 hr
Apr 10, 12:50 AM CDT	Mesoscale Discussion	SPC	Benton, Carroll, Cheatham, Chester, Davidson, Decatur and 16 more	85 min
Apr 10, 1:22 AM CDT	Severe Thunderstorm Watch	SPC	Bedford, Benton, Carroll, Cheatham, Chester, Davidson and 28 more	4 hr
Apr 10, 3:33 AM CDT	Mesoscale Discussion	SPC	Bedford, Cannon, Cheatham, Clay, Coffee, Davidson and 24 more	57 min
Apr 10, 8:53 AM CDT	Tornado Watch	SPC	Bedford, Benton, Cannon, Carroll, Cheatham, Chester and 46 more	7 hr
Apr 10, 1:51 PM CDT	Tornado Watch	SPC	Carter, Claiborne, Cocke, Grainger, Greene, Hamblen and 8 more	6 hr
Apr 10, 3:42 PM CDT	Mesoscale Discussion	SPC	Carter, Hancock, Hawkins, Johnson, Sullivan, Unicoi and 1 more	63 min
Apr 10, 6:53 PM CDT	Mesoscale Discussion	SPC	Carter, Claiborne, Grainger, Greene, Hamblen, Hancock and 7 more	67 min

Nearby

Mesoscale Discussions in Georgia, 2009 Mesoscale Discussions in Alabama, 2009 Mesoscale Discussions in Tennessee, 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; radar from the NEXRAD Level II archive.