Alert archive / Florida / Mesoscale Discussions in 2013

Mesoscale Discussion 229

February 25, 20134 counties in Alabama; 16 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Feb 25, 2013, 9:31 PM CST for 4 counties in Alabama; 16 counties in Florida. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Feb 25, 2013, 9:31 PM CST (03:31 UTC)
Expired: Feb 25, 2013, 10:30 PM CST
In force: 59 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Baldwin County, AL, Covington County, AL, Escambia County, AL, Mobile County, AL, Bay County, FL, Calhoun County, FL, Escambia 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, Okaloosa County, FL, Santa Rosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 45Feb 25, 11:55 PM CST

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 3.5 hours before the alert went out and 200 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 502 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 339 m²/s²
0-3 km storm-relative helicity: 337 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
Feb 25, 7:57 PM CST	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Conecuh, Escambia, Mobile and 2 more	63 min
Feb 25, 11:59 PM CST	Tornado Watch	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 12 more	8 hr
Feb 26, 2:51 AM CST	Mesoscale Discussion	SPC	Calhoun, Dixie, Gadsden, Gulf, Hamilton, Jackson and 8 more	114 min
Feb 26, 5:19 AM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 16 more	116 min
Feb 26, 5:49 AM CST	Tornado Watch	SPC	Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 31 more	8 hr
Feb 26, 10:38 AM CST	Mesoscale Discussion	SPC	Charlotte, Citrus, Clay, DeSoto, Duval, Flagler and 19 more	67 min

Nearby

Mesoscale Discussions in Florida, 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.