Alert archive / Alabama / Mesoscale Discussions in 2005

Mesoscale Discussion 479

April 1, 200519 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2005, 3:00 PM CST for 19 counties in Alabama. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Apr 1, 2005, 3:00 PM CST (21:00 UTC)
Expired: Apr 1, 2005, 4:30 PM CST
In force: 90 min
Issued by: the Storm Prediction Center

Counties Bibb County, AL, Blount County, AL, Chilton County, AL, Cullman County, AL, Dallas County, AL, Greene County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Limestone County, AL, Madison County, AL, Marengo County, AL, Marshall County, AL, Morgan County, AL, Perry County, AL, Shelby County, AL, St. Clair County, AL, Tuscaloosa County, AL, Walker County, AL

The radar

The Birmingham radar (KBMX), 47 km from the middle of the area, began a volume at 21:04 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, 9.0 hours before the alert went out and 232 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: 28 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 778 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 4 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 1, 1:29 AM CST	Mesoscale Discussion	SPC	Baldwin, Clarke, Escambia, Mobile, Washington	2 hr
Apr 1, 2:05 AM CST	Tornado Watch	SPC	Baldwin, Coffee, Conecuh, Covington, Escambia, Mobile and 1 more	5 hr
Apr 1, 11:16 AM CST	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale, Limestone	2 hr
Apr 1, 11:20 AM CST	Mesoscale Discussion	SPC	Bibb, Blount, Chilton, Choctaw, Cullman, Dallas and 18 more	115 min
Apr 1, 11:45 AM CST	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Blount, Chilton, Colbert, Cullman and 26 more	6 hr
Apr 1, 3:19 PM CST	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Conecuh, Mobile, Monroe and 2 more	116 min
Apr 1, 4:55 PM CST	Mesoscale Discussion	SPC	Autauga, Butler, Calhoun, Cherokee, Clay, Cleburne and 12 more	65 min

Nearby

Mesoscale Discussions in Alabama, 2005 Every mesoscale discussion in 2005

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.