Alert archive / Georgia / Mesoscale Discussions in 2014

Mesoscale Discussion 311

April 7, 201416 counties in Florida; 29 counties in Georgia; Beaufort County, Colleton County, Jasper County, South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2014, 1:45 PM EDT for 16 counties in Florida; 29 counties in Georgia; Beaufort County, Colleton County, Jasper County, South Carolina. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
Apr 7, 2014, 1:45 PM EDT (17:45 UTC)
Expired
Apr 7, 2014, 2:45 PM EDT
In force
60 min
Issued by
the Storm Prediction Center
Chance of a watch
80%
All 48 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Gilchrist County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Madison County, FL, Nassau County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Bulloch County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Cook County, GA, Echols County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Jeff Davis County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Pierce County, GA, Tattnall County, GA, Toombs County, GA, Ware County, GA, Wayne County, GA, Beaufort County, SC, Colleton County, SC, Jasper County, SC

The radar

The Jacksonville radar (KJAX), 59 km from the middle of the area, began a volume at 17:47 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.

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 5.8 hours before the alert went out and 58 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, Jacksonville, FL at 12:00Z on 2014-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 7 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, Jacksonville, FL at 12:00Z on 2014-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 square meters per square second.1939587897Sfc1 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
7 J/kg
Mixed-layer CIN
-328 J/kg
Mixed-layer LCL
942 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 6, 11:10 PM EDTMesoscale DiscussionSPCEscambia, Okaloosa, Santa Rosa, Walton2 hr
Apr 7, 1:50 AM EDTMesoscale DiscussionSPCEscambia, Okaloosa, Santa Rosa25 min
Apr 7, 2:16 AM EDTTornado WatchSPCEscambia, Okaloosa, Santa Rosa7 hr
Apr 7, 6:42 AM EDTMesoscale DiscussionSPCBay, Calhoun, Escambia, Gadsden, Holmes, Jackson and 7 more2 hr
Apr 7, 8:46 AM EDTTornado WatchSPCBay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 13 more7 hr
Apr 7, 11:04 AM EDTMesoscale DiscussionSPCBaker, Bay, Calhoun, Columbia, Franklin, Gadsden and 15 more116 min
Apr 7, 2:02 PM EDTTornado WatchSPCHamilton, Suwannee7 hr
Apr 7, 3:00 PM EDTMesoscale DiscussionSPCDixie, Franklin, Gadsden, Gulf, Jefferson, Lafayette and 5 more60 min
Apr 7, 3:33 PM EDTTornado WatchSPCDixie, Franklin, Gadsden, Gulf, Jefferson, Lafayette and 5 more6 hr

Nearby

Mesoscale Discussions in Georgia, 2014Mesoscale Discussions in Florida, 2014Mesoscale Discussions in South Carolina, 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.