Alert archive / Florida / Mesoscale Discussions in 2014

Mesoscale Discussion 473

April 29, 201412 counties in Florida; 11 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2014, 11:13 AM EDT for 12 counties in Florida; 11 counties in Georgia. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Apr 29, 2014, 11:13 AM EDT (15:13 UTC)
Expired
Apr 29, 2014, 12:15 PM EDT
In force
62 min
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 23 counties

Baker County, FL, Columbia County, FL, Franklin County, FL, Gulf County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Madison County, FL, Suwannee County, FL, Taylor County, FL, Wakulla County, FL, Atkinson County, GA, Berrien County, GA, Brooks County, GA, Clinch County, GA, Colquitt County, GA, Cook County, GA, Echols County, GA, Lanier County, GA, Lowndes County, GA, Thomas County, GA, Ware County, GA

The radar

The Tallahassee radar (KTLH), 35 km from the middle of the area, began a volume at 15:14 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 nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 3.2 hours before the alert went out and 37 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-pSkew-T log-p diagram, Tallahassee Rgnl, FL at 12:00Z on 2014-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1060 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 12:00Z on 2014-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 193 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1060 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
784 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
193 m²/s²
0-3 km storm-relative helicity
257 m²/s²
Significant tornado parameter
0.6
Supercell composite
4.3

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.

IssuedProductOfficeCountiesLasted
Apr 28, 8:59 PM EDTTornado WatchSPCEscambia, Okaloosa, Santa Rosa11 hr
Apr 29, 2:38 AM EDTMesoscale DiscussionSPCEscambia, Holmes, Jackson, Okaloosa, Santa Rosa, Walton and 1 more67 min
Apr 29, 2:56 AM EDTTornado WatchSPCBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 4 more9 hr
Apr 29, 5:01 AM EDTMesoscale DiscussionSPCCalhoun, Holmes, Jackson, Okaloosa, Walton, Washington89 min
Apr 29, 8:13 AM EDTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Jefferson and 3 more92 min
Apr 29, 1:46 PM EDTTornado WatchSPCEscambia, Okaloosa, Santa Rosa10 hr
Apr 29, 4:58 PM EDTMesoscale DiscussionSPCEscambia, Okaloosa, Santa Rosa92 min
Apr 28, 8:12 PM EDTMesoscale DiscussionSPCDade93 min
Apr 28, 10:34 PM EDTMesoscale DiscussionSPCBartow, Catoosa, Chattooga, Dade, Fannin, Floyd and 8 more86 min
Apr 28, 11:29 PM EDTMesoscale DiscussionSPCBanks, Habersham, Hall, Rabun, Stephens, Towns and 1 more61 min
Apr 29, 12:20 AM EDTMesoscale DiscussionSPCBartow, Carroll, Catoosa, Chattooga, Cherokee, Cobb and 20 more85 min
Apr 29, 12:30 AM EDTTornado WatchSPCBanks, Dawson, Forsyth, Franklin, Habersham, Hall and 7 more7 hr
Apr 29, 4:27 PM EDTMesoscale DiscussionSPCDade33 min

Nearby

Mesoscale Discussions in Florida, 2014Mesoscale Discussions in Georgia, 2014Every mesoscale discussion in 2014

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.