Alert archive / Alabama / Mesoscale Discussions in 2003

Mesoscale Discussion 786

May 6, 20034 states

The Storm Prediction Center issued this mesoscale discussion at May 6, 2003, 10:26 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 6, 2003, 10:26 AM CDT (15:26 UTC)
Expired: May 6, 2003, 12:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 45 counties

Blount County, AL, Calhoun County, AL, Cherokee County, AL, Cleburne County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Franklin County, AL, Jackson County, AL, Lamar County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, St. Clair County, AL, Walker County, AL, Winston County, AL, Chattooga County, GA, Dade County, GA, Alcorn County, MS, Itawamba County, MS, Lee County, MS, Monroe County, MS, Prentiss County, MS, Tishomingo County, MS, Bedford County, TN, Coffee County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hardin County, TN, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Maury County, TN, Moore County, TN, Sequatchie County, TN, Warren County, TN, Wayne County, TN

The radar

The Northeast Alabama radar (KHTX), 117 km from the middle of the area, began a volume at 15:26 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.

Tornado Watch 270May 6, 12:30 PM CDT

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 3.4 hours before the alert went out and 164 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: 862 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 122 m²/s²
0-3 km storm-relative helicity: 102 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
May 5, 7:53 PM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Clay, Cleburne, Colbert and 20 more	2 hr
May 5, 9:05 PM CDT	Tornado Watch	SPC	Bibb, Blount, Calhoun, Chambers, Cherokee, Clay and 17 more	7 hr
May 5, 10:27 PM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Cleburne, Cullman, DeKalb and 12 more	2 hr
May 6, 1:26 AM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Chambers, Cherokee, Clay, Cleburne and 17 more	3 hr
May 6, 1:50 AM CDT	Tornado Watch	SPC	Blount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 14 more	6 hr
May 6, 5:06 AM CDT	Mesoscale Discussion	SPC	Blount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 9 more	3 hr
May 6, 7:40 AM CDT	Tornado Watch	SPC	Blount, Calhoun, Cherokee, Cleburne, Colbert, Cullman and 16 more	5 hr
May 6, 12:15 PM CDT	Mesoscale Discussion	SPC	Bibb, Blount, Calhoun, Cherokee, Clay, Cleburne and 18 more	90 min
May 6, 12:30 PM CDT	Tornado Watch	SPC	Bibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 22 more	7 hr
May 6, 3:41 PM CDT	Mesoscale Discussion	SPC	Bibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 20 more	2 hr
May 6, 5:48 PM CDT	Mesoscale Discussion	SPC	Bibb, Chilton, Coosa, Greene, Hale, Jefferson and 5 more	3 hr
May 5, 8:30 PM CDT	Tornado Watch	SPC	Baldwin, Barrow, Bibb, Butts, Carroll, Clarke and 43 more	8 hr
May 6, 12:55 AM CDT	Tornado Watch	SPC	Burke, Columbia, Jefferson, Lincoln, McDuffie, Richmond	6 hr
May 6, 1:53 AM CDT	Mesoscale Discussion	SPC	Baldwin, Barrow, Butts, Carroll, Clarke, Clayton and 40 more	2 hr
May 6, 5:23 AM CDT	Mesoscale Discussion	SPC	Burke, Columbia, Jefferson, McDuffie, Richmond	2 hr
May 6, 9:45 AM CDT	Severe Thunderstorm Watch	SPC	Banks, Barrow, Bartow, Carroll, Catoosa, Chattooga and 41 more	5 hr
May 6, 1:18 PM CDT	Mesoscale Discussion	SPC	Effingham, Screven	117 min

Nearby

Mesoscale Discussions in Alabama, 2003 Mesoscale Discussions in Tennessee, 2003 Mesoscale Discussions in Mississippi, 2003 Every mesoscale discussion in 2003

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.