Alert archive / Florida / Mesoscale Discussions in 2013

Mesoscale Discussion 314

March 24, 2013Houston County, Alabama; 12 counties in Florida; 5 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 24, 2013, 3:12 AM CDT for Houston County, Alabama; 12 counties in Florida; 5 counties in Georgia. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued: Mar 24, 2013, 3:12 AM CDT (08:12 UTC)
Expired: Mar 24, 2013, 4:45 AM CDT
In force: 93 min
Issued by: the Storm Prediction Center
Chance of a watch: 60%

Counties Houston County, AL, Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Wakulla County, FL, Washington County, FL, Decatur County, GA, Early County, GA, Grady County, GA, Miller County, GA, Seminole County, GA

The radar

The Tallahassee radar (KTLH), 64 km from the middle of the area, began a volume at 08:14 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 63Mar 24, 3:40 AM CDT

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 8.2 hours before the alert went out and 66 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: 33 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 591 m above ground
0-6 km bulk shear: 64 kt
0-1 km storm-relative helicity: 105 m²/s²
0-3 km storm-relative helicity: 135 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
Mar 23, 9:29 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Blount, Bullock, Calhoun, Chambers and 30 more	61 min
Mar 23, 10:28 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Chambers, Chilton, Clay, Coosa and 11 more	92 min
Mar 24, 3:12 AM CDT	Mesoscale Discussion	SPC	Autauga, Bullock, Butler, Chilton, Choctaw, Clarke and 15 more	93 min
Mar 24, 3:42 AM CDT	Tornado Watch	SPC	Henry, Houston	6 hr
Mar 24, 5:55 AM CDT	Mesoscale Discussion	SPC	Russell	65 min
Mar 24, 6:54 AM CDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Dixie and 18 more	66 min
Mar 24, 9:09 AM CDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Duval, Levy and 4 more	66 min
Mar 24, 12:57 PM CDT	Mesoscale Discussion	SPC	Lake, Orange, Seminole	63 min
Mar 24, 4:35 PM CDT	Mesoscale Discussion	SPC	Charlotte, Glades, Highlands, Lee, Martin, Okeechobee and 1 more	115 min
Mar 23, 11:48 PM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Barrow, Bibb, Bleckley, Butts, Carroll and 64 more	7 hr
Mar 24, 3:46 AM CDT	Mesoscale Discussion	SPC	Baldwin, Barrow, Bibb, Bleckley, Butts, Carroll and 65 more	89 min

Nearby

Mesoscale Discussions in Florida, 2013 Mesoscale Discussions in Georgia, 2013 Mesoscale Discussions in Alabama, 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.