Alert archive / Alabama / Mesoscale Discussions in 2004

Mesoscale Discussion 2451

November 23, 200420 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Nov 23, 2004, 11:16 PM CST for 20 counties in Alabama. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Nov 23, 2004, 11:16 PM CST (05:16 UTC)
Expired
Nov 24, 2004, 1:15 AM CST
In force
119 min
Issued by
the Storm Prediction Center

Counties Bibb County, AL, Blount County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Cullman County, AL, Dallas County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Perry County, AL, Shelby County, AL, St. Clair County, AL, Tuscaloosa County, AL, Walker County, AL, Washington County, AL, Wilcox County, AL

The radar

The Birmingham radar (KBMX), 92 km from the middle of the area, began a volume at 05:17 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, 5.3 hours before the alert went out and 92 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-pSkew-T log-p diagram, Birmingham, AL at 00:00Z on 2004-11-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 748 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 2004-11-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 84 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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.

IssuedProductOfficeCountiesLasted
Nov 23, 9:00 PM CSTMesoscale DiscussionSPCBlount, Colbert, Cullman, DeKalb, Etowah, Franklin and 10 more2 hr
Nov 23, 9:20 PM CSTTornado WatchSPCBlount, Colbert, Cullman, Etowah, Fayette, Franklin and 13 more7 hr
Nov 24, 12:30 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Bibb, Chilton, Choctaw, Clarke and 12 more30 min
Nov 24, 12:45 AM CSTTornado WatchSPCBibb, Chilton, Choctaw, Clarke, Dallas, Greene and 7 more5 hr
Nov 24, 2:43 AM CSTMesoscale DiscussionSPCChoctaw, Clarke, Greene, Hale, Marengo, Pickens and 3 more62 min
Nov 24, 3:35 AM CSTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Clay, Cleburne, Cullman and 11 more25 min
Nov 24, 3:55 AM CSTTornado WatchSPCBlount, Calhoun, Cherokee, Cleburne, Cullman, Etowah and 5 more5 hr
Nov 24, 4:57 AM CSTMesoscale DiscussionSPCAutauga, Bibb, Chilton, Choctaw, Clarke, Conecuh and 13 more63 min
Nov 24, 5:20 AM CSTTornado WatchSPCAutauga, Baldwin, Bibb, Butler, Chambers, Chilton and 20 more6 hr
Nov 24, 7:11 AM CSTMesoscale DiscussionSPCBaldwin, Barbour, Bullock, Butler, Calhoun, Chambers and 24 more64 min
Nov 24, 7:25 AM CSTTornado WatchSPCBarbour, Chambers, Lee, Russell6 hr
Nov 24, 8:03 AM CSTMesoscale DiscussionSPCBarbour, Coffee, Covington, Dale, Geneva, Henry and 2 more57 min
Nov 24, 8:30 AM CSTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston6 hr
Nov 24, 9:23 AM CSTMesoscale DiscussionSPCBarbour, Chambers, Lee, Russell97 min
Nov 24, 11:24 AM CSTMesoscale DiscussionSPCCoffee, Dale, Geneva, Henry, Houston2 hr

Nearby

Mesoscale Discussions in Alabama, 2004Every 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.