Alert archive / Alabama / Mesoscale Discussions in 2005

Mesoscale Discussion 480

April 1, 20058 counties in Alabama; 5 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2005, 3:19 PM CST for 8 counties in Alabama; 5 counties in Mississippi. It was in force for 116 min.

The area

The outline as issued.

The facts

Issued: Apr 1, 2005, 3:19 PM CST (21:19 UTC)
Expired: Apr 1, 2005, 5:15 PM CST
In force: 116 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, George County, MS, Greene County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 73 km from the middle of the area, began a volume at 21:20 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 nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 9.3 hours before the alert went out and 185 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: 1645 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 514 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: -14 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 1.8

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, 3:00 PM CST	Mesoscale Discussion	SPC	Bibb, Blount, Chilton, Cullman, Dallas, Greene and 13 more	90 min
Apr 1, 4:55 PM CST	Mesoscale Discussion	SPC	Autauga, Butler, Calhoun, Cherokee, Clay, Cleburne and 12 more	65 min
Mar 31, 8:59 PM CST	Mesoscale Discussion	SPC	Adams, Amite, Covington, Forrest, Franklin, George and 18 more	61 min
Mar 31, 10:53 PM CST	Mesoscale Discussion	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 34 more	67 min
Mar 31, 11:15 PM CST	Tornado Watch	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 34 more	8 hr
Apr 1, 4:14 AM CST	Mesoscale Discussion	SPC	Clarke, Covington, Forrest, George, Greene, Jasper and 16 more	2 hr

Nearby

Mesoscale Discussions in Alabama, 2005 Mesoscale Discussions in Mississippi, 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.