Alert archive / Alabama / Mesoscale Discussions in 2013

Mesoscale Discussion 984

June 6, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Jun 6, 2013, 5:35 PM CDT for 4 states. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: Jun 6, 2013, 5:35 PM CDT (22:35 UTC)
Expired: Jun 6, 2013, 7:30 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

All 34 counties

Baldwin County, AL, Bibb County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Dallas County, AL, Escambia County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Lamar County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Jefferson Parish, LA, Lafourche Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Clay County, MS, Jackson County, MS, Kemper County, MS, Lowndes County, MS, Noxubee County, MS, Oktibbeha County, MS

The radar

The Mobile radar (KMOB), 68 km from the middle of the area, began a volume at 22:39 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, 10.6 hours before the alert went out and 146 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: 222 J/kg
Mixed-layer CIN: -211 J/kg
Mixed-layer LCL: 1044 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

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
Jun 5, 7:48 PM CDT	Mesoscale Discussion	SPC	Collier, Lee, Miami-Dade, Monroe, Sarasota	2 hr
Jun 6, 2:17 AM CDT	Mesoscale Discussion	SPC	Broward, Charlotte, Collier, DeSoto, Glades, Hardee and 13 more	118 min
Jun 6, 2:42 AM CDT	Tornado Watch	SPC	Brevard, Broward, Charlotte, Citrus, Collier, DeSoto and 23 more	7 hr
Jun 6, 5:52 AM CDT	Mesoscale Discussion	SPC	Brevard, Broward, Collier, DeSoto, Glades, Hardee and 16 more	83 min
Jun 6, 9:03 AM CDT	Mesoscale Discussion	SPC	Brevard, Broward, Charlotte, Citrus, Collier, DeSoto and 21 more	57 min
Jun 6, 9:43 AM CDT	Tornado Watch	SPC	Alachua, Baker, Bradford, Brevard, Broward, Charlotte and 38 more	11 hr
Jun 6, 12:25 PM CDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Brevard, Broward, Charlotte and 37 more	65 min
Jun 6, 3:50 PM CDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Brevard, Broward, Charlotte and 37 more	55 min
Jun 6, 6:32 PM CDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Brevard, Broward, Charlotte and 33 more	118 min
Jun 6, 12:28 PM CDT	Mesoscale Discussion	SPC	Calcasieu, Cameron, Jefferson Davis	92 min
Jun 6, 1:30 PM CDT	Mesoscale Discussion	SPC	Attala, Bolivar, Calhoun, Carroll, Chickasaw, Choctaw and 16 more	90 min

Nearby

Mesoscale Discussions in Alabama, 2013 Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Louisiana, 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.