Alert archive / Georgia / Mesoscale Discussions in 2014

Mesoscale Discussion 471

April 29, 20149 counties in Alabama; 6 counties in Florida; 55 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 29, 2014, 4:01 AM CDT for 9 counties in Alabama; 6 counties in Florida; 55 counties in Georgia. It was in force for 89 min.

The area

The outline as issued.

The facts

Issued
Apr 29, 2014, 4:01 AM CDT (09:01 UTC)
Expired
Apr 29, 2014, 5:30 AM CDT
In force
89 min
Issued by
the Storm Prediction Center
All 70 counties

Barbour County, AL, Chambers County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Randolph County, AL, Russell County, AL, Calhoun County, FL, Holmes County, FL, Jackson County, FL, Okaloosa County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Barrow County, GA, Bartow County, GA, Butts County, GA, Calhoun County, GA, Carroll County, GA, Chattahoochee County, GA, Cherokee County, GA, Clay County, GA, Clayton County, GA, Cobb County, GA, Coweta County, GA, Crawford County, GA, Decatur County, GA, DeKalb County, GA, Dougherty County, GA, Douglas County, GA, Early County, GA, Fayette County, GA, Floyd County, GA, Forsyth County, GA, Fulton County, GA, Gwinnett County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Henry County, GA, Jasper County, GA, Lamar County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Meriwether County, GA, Miller County, GA, Monroe County, GA, Muscogee County, GA, Newton County, GA, Paulding County, GA, Pike County, GA, Polk County, GA, Quitman County, GA, Randolph County, GA, Rockdale County, GA, Schley County, GA, Seminole 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 Ft Rucker radar (KEOX), 66 km from the middle of the area, began a volume at 09:05 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

Birmingham, AL (KBMX), launched 00:00Z, 9.0 hours before the alert went out and 172 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, Birmingham, AL at 00:00Z on 2014-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1160 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, Birmingham, AL at 00:00Z on 2014-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 236 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
1160 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
1240 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
236 m²/s²
0-3 km storm-relative helicity
361 m²/s²
Significant tornado parameter
1.6
Supercell composite
9.6

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, 1:38 AM CDTMesoscale DiscussionSPCBaldwin, Barbour, Bullock, Butler, Chambers, Coffee and 18 more67 min
Apr 29, 1:56 AM CDTTornado WatchSPCCoffee, Dale, Geneva, Henry, Houston9 hr
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.