Alert archive / Georgia / Mesoscale Discussions in 2014

Mesoscale Discussion 470

April 29, 201424 counties in Alabama; 7 counties in Florida; 55 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2014, 1:38 AM CDT for 24 counties in Alabama; 7 counties in Florida; 55 counties in Georgia. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Apr 29, 2014, 1:38 AM CDT (06:38 UTC)
Expired
Apr 29, 2014, 2:45 AM CDT
In force
67 min
Issued by
the Storm Prediction Center
All 86 counties

Baldwin County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Chambers County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Elmore County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Mobile County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, Tallapoosa County, AL, Escambia County, FL, Holmes County, FL, Jackson County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Barrow County, GA, Bibb County, GA, Butts County, GA, Calhoun County, GA, Carroll County, GA, Chattahoochee County, GA, Clarke County, GA, Clay County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Crawford County, GA, DeKalb County, GA, Douglas County, GA, Early County, GA, Fayette County, GA, Forsyth County, GA, Fulton County, GA, Gwinnett County, GA, Hall County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Jackson County, GA, Jasper County, GA, Jones County, GA, Lamar County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Monroe County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Paulding County, GA, Peach County, GA, Pike County, GA, Putnam County, GA, Quitman County, GA, Randolph County, GA, Rockdale County, GA, Schley County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taylor County, GA, Terrell County, GA, Troup County, GA, Upson County, GA, Walton County, GA, Webster County, GA

The radar

The Maxwell AFB radar (KMXX), 33 km from the middle of the area, began a volume at 06:38 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

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 6.6 hours before the alert went out and 142 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, Peachtre/Fal Fld, GA at 00:00Z on 2014-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1978 joules per kilogram.LCLEL10008507005003002001001 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, Peachtre/Fal Fld, GA at 00:00Z on 2014-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 175 square meters per square second.193958Sfc1 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
1978 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1007 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
175 m²/s²
0-3 km storm-relative helicity
250 m²/s²
Significant tornado parameter
2.7
Supercell composite
13.0

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 28, 7:12 PM CDTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Jackson, Lamar and 10 more93 min
Apr 28, 7:59 PM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Blount, Bullock and 51 more11 hr
Apr 28, 9:34 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 23 more86 min
Apr 28, 10:53 PM CDTMesoscale DiscussionSPCBibb, Blount, Etowah, Jefferson, Marshall, St. Clair and 2 more97 min
Apr 28, 11:20 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Blount, Calhoun, Cherokee, Chilton and 21 more85 min
Apr 29, 1:56 AM CDTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston9 hr
Apr 29, 4:01 AM CDTMesoscale DiscussionSPCBarbour, Chambers, Dale, Geneva, Henry, Houston and 3 more89 min
Apr 29, 12:46 PM CDTTornado WatchSPCBaldwin, Mobile, Washington10 hr
Apr 29, 3:27 PM CDTMesoscale DiscussionSPCBibb, Blount, Choctaw, Colbert, Cullman, DeKalb and 20 more33 min
Apr 29, 3:56 PM CDTTornado WatchSPCBibb, Blount, Calhoun, Cherokee, Chilton, Colbert and 27 more4 hr
Apr 29, 3:58 PM CDTMesoscale DiscussionSPCClarke, Conecuh, Covington, Escambia, Monroe92 min
Apr 29, 6:01 PM CDTMesoscale DiscussionSPCChoctaw, Washington89 min
Apr 29, 6:55 PM CDTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cullman, DeKalb, Etowah and 17 more95 min
Apr 29, 7:13 AM CDTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Jefferson and 3 more92 min
Apr 29, 10:13 AM CDTMesoscale DiscussionSPCBaker, Columbia, Franklin, Gulf, Hamilton, Jefferson and 6 more62 min
Apr 28, 10:29 PM CDTMesoscale DiscussionSPCBanks, Habersham, Hall, Rabun, Stephens, Towns and 1 more61 min
Apr 28, 11:30 PM CDTTornado WatchSPCBanks, Dawson, Forsyth, Franklin, Habersham, Hall and 7 more7 hr

Nearby

Mesoscale Discussions in Georgia, 2014Mesoscale Discussions in Alabama, 2014Mesoscale Discussions in Florida, 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.