Alert archive / Florida / Mesoscale Discussions in 2005

Mesoscale Discussion 473

April 1, 20054 states

The Storm Prediction Center issued this mesoscale discussion at Apr 1, 2005, 1:29 AM CST for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 1, 2005, 1:29 AM CST (07:29 UTC)
Expired: Apr 1, 2005, 3:30 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center

All 21 counties

Baldwin County, AL, Clarke County, AL, Escambia County, AL, Mobile County, AL, Washington County, AL, Escambia County, FL, Holmes County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Tammany Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS

The radar

The Mobile radar (KMOB), 33 km from the middle of the area, began a volume at 07:28 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.

Tornado Watch 120Apr 1, 2:05 AM CST

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 7.5 hours before the alert went out and 124 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: 1854 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 456 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 7.1

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 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, 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
Apr 1, 7:44 AM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bay, Bradford, Calhoun, Columbia and 16 more	2 hr
Apr 1, 10:30 AM CST	Tornado Watch	SPC	Alachua, Baker, Bradford, Calhoun, Clay, Columbia and 17 more	8 hr
Apr 1, 1:16 PM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Dixie and 10 more	119 min
Apr 1, 5:23 PM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Calhoun, Clay, Columbia and 17 more	67 min
Mar 31, 6:49 PM CST	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Bienville, Bossier, Caddo and 16 more	56 min
Mar 31, 7:05 PM CST	Severe Thunderstorm Watch	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 17 more	5 hr
Mar 31, 8:25 PM CST	Mesoscale Discussion	SPC	Acadia, Calcasieu, Cameron, Jefferson Davis, Vermilion	65 min
Mar 31, 8:45 PM CST	Severe Thunderstorm Watch	SPC	Acadia, Allen, Beauregard, Calcasieu, Cameron, Evangeline and 4 more	7 hr
Mar 31, 8:59 PM CST	Mesoscale Discussion	SPC	Ascension, Catahoula, Concordia, East Baton Rouge, East Feliciana, Iberville and 8 more	61 min
Mar 31, 9:27 PM CST	Mesoscale Discussion	SPC	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 15 more	63 min
Mar 31, 10:53 PM CST	Mesoscale Discussion	SPC	Avoyelles, Bienville, Bossier, Caddo, Caldwell, Catahoula and 29 more	67 min
Mar 31, 11:15 PM CST	Tornado Watch	SPC	Avoyelles, Bienville, Caldwell, Catahoula, Claiborne, Concordia and 27 more	8 hr
Apr 1, 12:25 AM CST	Mesoscale Discussion	SPC	Acadia, Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis and 3 more	95 min
Apr 1, 4:14 AM CST	Mesoscale Discussion	SPC	Saint Helena, Tangipahoa, Washington	2 hr

Nearby

Mesoscale Discussions in Florida, 2005 Mesoscale Discussions in Louisiana, 2005 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.