Alert archive / Alabama / Mesoscale Discussions in 2004

Mesoscale Discussion 2455

November 24, 200417 counties in Alabama; Lowndes County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 24, 2004, 3:35 AM CST for 17 counties in Alabama; Lowndes County, Mississippi. It was in force for 25 min.

The area

The outline as issued.

The facts

Issued: Nov 24, 2004, 3:35 AM CST (09:35 UTC)
Expired: Nov 24, 2004, 4:00 AM CST
In force: 25 min
Issued by: the Storm Prediction Center

Counties Blount County, AL, Calhoun County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Cullman County, AL, Etowah County, AL, Fayette County, AL, Jefferson County, AL, Lamar County, AL, Marion County, AL, Shelby County, AL, St. Clair County, AL, Talladega County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Lowndes County, MS

The radar

The Birmingham radar (KBMX), 68 km from the middle of the area, began a volume at 09:35 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.

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 9.6 hours before the alert went out and 67 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: 748 J/kg
Mixed-layer CIN: -25 J/kg
Mixed-layer LCL: 728 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 342 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.6

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
Nov 23, 9:00 PM CST	Mesoscale Discussion	SPC	Blount, Colbert, Cullman, DeKalb, Etowah, Franklin and 10 more	2 hr
Nov 23, 9:20 PM CST	Tornado Watch	SPC	Blount, Colbert, Cullman, Etowah, Fayette, Franklin and 13 more	7 hr
Nov 23, 11:16 PM CST	Mesoscale Discussion	SPC	Bibb, Blount, Chilton, Choctaw, Clarke, Cullman and 14 more	119 min
Nov 24, 12:30 AM CST	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Chilton, Choctaw, Clarke and 12 more	30 min
Nov 24, 12:45 AM CST	Tornado Watch	SPC	Bibb, Chilton, Choctaw, Clarke, Dallas, Greene and 7 more	5 hr
Nov 24, 2:43 AM CST	Mesoscale Discussion	SPC	Choctaw, Clarke, Greene, Hale, Marengo, Pickens and 3 more	62 min
Nov 24, 3:55 AM CST	Tornado Watch	SPC	Blount, Calhoun, Cherokee, Cleburne, Cullman, Etowah and 5 more	5 hr
Nov 24, 4:57 AM CST	Mesoscale Discussion	SPC	Autauga, Bibb, Chilton, Choctaw, Clarke, Conecuh and 13 more	63 min
Nov 24, 5:20 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Bibb, Butler, Chambers, Chilton and 20 more	6 hr
Nov 24, 7:11 AM CST	Mesoscale Discussion	SPC	Baldwin, Barbour, Bullock, Butler, Calhoun, Chambers and 24 more	64 min
Nov 24, 7:25 AM CST	Tornado Watch	SPC	Barbour, Chambers, Lee, Russell	6 hr
Nov 24, 8:03 AM CST	Mesoscale Discussion	SPC	Barbour, Coffee, Covington, Dale, Geneva, Henry and 2 more	57 min
Nov 24, 8:30 AM CST	Tornado Watch	SPC	Coffee, Dale, Geneva, Henry, Houston	6 hr
Nov 24, 9:23 AM CST	Mesoscale Discussion	SPC	Barbour, Chambers, Lee, Russell	97 min
Nov 24, 11:24 AM CST	Mesoscale Discussion	SPC	Coffee, Dale, Geneva, Henry, Houston	2 hr
Nov 23, 6:35 PM CST	Tornado Watch	SPC	Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 28 more	7 hr
Nov 23, 7:53 PM CST	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Franklin, Hinds and 13 more	37 min
Nov 23, 8:15 PM CST	Tornado Watch	SPC	Adams, Amite, Claiborne, Copiah, Franklin, Hinds and 15 more	6 hr
Nov 23, 9:14 PM CST	Mesoscale Discussion	SPC	Adams, Claiborne, Franklin, Hinds, Humphreys, Issaquena and 5 more	2 hr
Nov 23, 10:01 PM CST	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Franklin, Issaquena and 4 more	119 min
Nov 24, 1:28 AM CST	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Copiah, Franklin, Hinds and 14 more	32 min
Nov 24, 1:45 AM CST	Tornado Watch	SPC	Adams, Amite, Attala, Claiborne, Copiah, Franklin and 15 more	4 hr
Nov 24, 2:50 AM CST	Tornado Watch	SPC	Hancock, Harrison, Jackson	3 hr
Nov 24, 5:35 AM CST	Mesoscale Discussion	SPC	Hancock, Harrison, Jackson	25 min
Nov 24, 5:55 AM CST	Tornado Watch	SPC	Harrison, Jackson	2 hr
Nov 24, 10:16 AM CST	Mesoscale Discussion	SPC	Alcorn, Benton, Lafayette, Marshall, Prentiss, Tippah and 1 more	2 hr

Nearby

Mesoscale Discussions in Alabama, 2004 Mesoscale Discussions in Mississippi, 2004 Every mesoscale discussion in 2004

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.