Alert archive / Alabama / Mesoscale Discussions in 2013

Mesoscale Discussion 301

March 23, 201314 counties in Alabama; Escambia County, Santa Rosa County, Florida; 12 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 23, 2013, 12:35 PM CDT for 14 counties in Alabama; Escambia County, Santa Rosa County, Florida; 12 counties in Mississippi. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Mar 23, 2013, 12:35 PM CDT (17:35 UTC)
Expired: Mar 23, 2013, 2:00 PM CDT
In force: 85 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 28 counties

Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Lowndes County, AL, Mobile County, AL, Monroe County, AL, Pike County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Santa Rosa County, FL, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jones County, MS, Lamar County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 68 km from the middle of the area, began a volume at 17:38 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.

Severe Thunderstorm Watch 58Mar 23, 1:00 PM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 5.6 hours before the alert went out and 226 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: 18 J/kg
Mixed-layer CIN: -308 J/kg
Mixed-layer LCL: 445 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 250 m²/s²
0-3 km storm-relative helicity: 168 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
Mar 23, 3:41 AM CDT	Mesoscale Discussion	SPC	Blount, Colbert, Cullman, Fayette, Franklin, Jefferson and 12 more	64 min
Mar 23, 7:38 AM CDT	Mesoscale Discussion	SPC	Baldwin, Covington, Escambia, Geneva, Mobile	97 min
Mar 23, 12:56 PM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Barbour, Bullock, Butler, Choctaw, Clarke and 19 more	9 hr
Mar 23, 2:52 PM CDT	Mesoscale Discussion	SPC	Baldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 13 more	83 min
Mar 23, 5:22 PM CDT	Mesoscale Discussion	SPC	Baldwin, Butler, Choctaw, Clarke, Coffee, Conecuh and 13 more	53 min
Mar 23, 6:24 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Butler, Chilton, Choctaw and 24 more	66 min
Mar 23, 6:42 PM CDT	Severe Thunderstorm Watch	SPC	Autauga, Barbour, Bibb, Blount, Bullock, Calhoun and 33 more	7 hr
Mar 23, 6:49 PM CDT	Mesoscale Discussion	SPC	Greene, Lamar, Pickens, Sumter	116 min
Mar 23, 9:54 AM CDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 7 more	36 min
Mar 23, 9:59 AM CDT	Severe Thunderstorm Watch	SPC	Baker, Bradford, Clay, Columbia, Duval, Hamilton and 8 more	6 hr
Mar 23, 11:16 AM CDT	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 6 more	89 min
Mar 23, 12:25 PM CDT	Mesoscale Discussion	SPC	Bradford, Clay, Columbia, Union	35 min
Mar 23, 1:15 PM CDT	Mesoscale Discussion	SPC	Alachua, Brevard, Citrus, Hardee, Hernando, Hillsborough and 11 more	2 hr
Mar 23, 1:44 PM CDT	Mesoscale Discussion	SPC	Baker, Bradford, Clay, Columbia, Duval, Hamilton and 4 more	31 min
Mar 23, 3:33 PM CDT	Mesoscale Discussion	SPC	Baker, Bradford, Clay, Columbia, Duval, Nassau and 1 more	27 min
Mar 22, 8:16 PM CDT	Mesoscale Discussion	SPC	Attala, Bolivar, Carroll, Choctaw, Claiborne, Copiah and 18 more	119 min
Mar 23, 5:01 PM CDT	Mesoscale Discussion	SPC	Adams, Attala, Carroll, Choctaw, Claiborne, Copiah and 28 more	119 min
Mar 23, 5:21 PM CDT	Tornado Watch	SPC	Adams, Amite, Claiborne, Clarke, Copiah, Covington and 25 more	6 hr
Mar 23, 5:45 PM CDT	Severe Thunderstorm Watch	SPC	Attala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 29 more	5 hr

Nearby

Mesoscale Discussions in Alabama, 2013 Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Florida, 2013 Every mesoscale discussion in 2013

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.