Alert archive / Alabama / Mesoscale Discussions in 2005

Mesoscale Discussion 503

April 6, 200515 counties in Alabama; 5 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 6, 2005, 10:50 AM CDT for 15 counties in Alabama; 5 counties in Florida. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Apr 6, 2005, 10:50 AM CDT (15:50 UTC)
Expired: Apr 6, 2005, 11:45 AM CDT
In force: 55 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Butler County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, Escambia County, AL, Geneva County, AL, Hale County, AL, Lowndes County, AL, Marengo County, AL, Monroe County, AL, Wilcox County, AL, Escambia County, FL, Holmes County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 132Apr 6, 11:05 AM CDT

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 3.8 hours before the alert went out and 202 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: 1203 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 162 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 6, 7:00 AM CDT	Tornado Watch	SPC	Choctaw, Greene, Mobile, Pickens, Sumter, Washington	6 hr
Apr 6, 9:29 AM CDT	Mesoscale Discussion	SPC	Choctaw, Greene, Mobile, Pickens, Sumter, Washington	2 hr
Apr 6, 11:05 AM CDT	Tornado Watch	SPC	Autauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 20 more	8 hr
Apr 6, 1:21 PM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 20 more	84 min
Apr 6, 3:43 PM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 20 more	92 min
Apr 6, 4:53 PM CDT	Mesoscale Discussion	SPC	Bibb, Blount, Chilton, Colbert, Coosa, Cullman and 19 more	37 min
Apr 6, 5:20 PM CDT	Tornado Watch	SPC	Bibb, Chilton, Cullman, Fayette, Greene, Hale and 8 more	8 hr
Apr 6, 6:01 PM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 21 more	59 min
Apr 6, 6:45 PM CDT	Tornado Watch	SPC	Autauga, Bibb, Butler, Chilton, Choctaw, Clarke and 20 more	6 hr

Nearby

Mesoscale Discussions in Alabama, 2005 Mesoscale Discussions in Florida, 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.