Alert archive / Alabama / Mesoscale Discussions in 2006

Mesoscale Discussion 413

April 3, 200615 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2006, 12:39 AM CDT for 15 counties in Alabama. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Apr 3, 2006, 12:39 AM CDT (05:39 UTC)
Expired: Apr 3, 2006, 2:15 AM CDT
In force: 96 min
Issued by: the Storm Prediction Center

Counties Blount County, AL, Cherokee County, AL, Colbert County, AL, Cullman County, AL, DeKalb County, AL, Etowah County, AL, Franklin County, AL, Jackson County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marion County, AL, Marshall County, AL, Morgan County, AL, Winston County, AL

The radar

The Northeast Alabama radar (KHTX), 103 km from the middle of the area, began a volume at 05:40 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, 5.7 hours before the alert went out and 142 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: 1222 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1601 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 341 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 6.2

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 3, 1:06 AM CDT	Tornado Watch	SPC	Blount, Colbert, Cullman, DeKalb, Etowah, Fayette and 17 more	5 hr
Apr 3, 5:10 AM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Bullock, Calhoun, Chambers, Cherokee and 15 more	2 hr
Apr 3, 10:55 AM CDT	Mesoscale Discussion	SPC	Cherokee	2 hr

Nearby

Mesoscale Discussions in Alabama, 2006 Every mesoscale discussion in 2006

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.