Alert archive / Alabama / Mesoscale Discussions in 2003

Mesoscale Discussion 584

April 25, 200321 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2003, 5:16 PM CDT for 21 counties in Alabama. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Apr 25, 2003, 5:16 PM CDT (22:16 UTC)
Expired: Apr 25, 2003, 6:15 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center

All 21 counties

Autauga County, AL, Barbour County, AL, Bibb County, AL, Bullock County, AL, Butler County, AL, Chilton County, AL, Choctaw County, AL, Coosa County, AL, Crenshaw County, AL, Dallas County, AL, Elmore County, AL, Hale County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Marengo County, AL, Montgomery County, AL, Perry County, AL, Pike County, AL, Tallapoosa County, AL, Wilcox County, AL

The radar

The Birmingham radar (KBMX), 92 km from the middle of the area, began a volume at 22:20 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 12:00Z, 10.3 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-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: 651 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 264 m²/s²
0-3 km storm-relative helicity: 299 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 25, 1:15 AM CDT	Mesoscale Discussion	SPC	Choctaw, Clarke, Greene, Hale, Marengo, Pickens and 2 more	90 min
Apr 25, 3:05 AM CDT	Mesoscale Discussion	SPC	Baldwin, Bibb, Butler, Choctaw, Clarke, Conecuh and 17 more	85 min
Apr 25, 5:40 AM CDT	Mesoscale Discussion	SPC	Baldwin, Coffee, Covington, Dale, Escambia, Geneva and 2 more	65 min
Apr 25, 6:05 AM CDT	Tornado Watch	SPC	Coffee, Covington, Geneva, Houston	6 hr
Apr 25, 7:41 AM CDT	Mesoscale Discussion	SPC	Houston	94 min
Apr 25, 11:04 AM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Lauderdale, Marion, Winston	116 min
Apr 25, 12:45 PM CDT	Tornado Watch	SPC	Autauga, Bibb, Blount, Bullock, Butler, Calhoun and 45 more	5 hr
Apr 25, 12:59 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Chilton, Choctaw, Coosa and 15 more	2 hr
Apr 25, 3:08 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Bullock, Calhoun, Chambers and 24 more	2 hr
Apr 25, 5:40 PM CDT	Tornado Watch	SPC	Barbour, Bullock, Butler, Choctaw, Clarke, Coffee and 10 more	5 hr

Nearby

Mesoscale Discussions in Alabama, 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.