Alert archive / Georgia / Mesoscale Discussions in 2015

Mesoscale Discussion 1239

June 30, 2015Geneva County, Henry County, Houston County, Alabama; 16 counties in Florida; 41 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2015, 11:17 AM CDT for Geneva County, Henry County, Houston County, Alabama; 16 counties in Florida; 41 counties in Georgia. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
Jun 30, 2015, 11:17 AM CDT (16:17 UTC)
Expired
Jun 30, 2015, 12:45 PM CDT
In force
88 min
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 60 counties

Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Columbia County, FL, Gadsden County, FL, Hamilton County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Suwannee County, FL, Taylor County, FL, Wakulla County, FL, Washington County, FL, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Echols County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Pulaski County, GA, Randolph County, GA, Seminole County, GA, Sumter County, GA, Telfair County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Ware County, GA, Webster County, GA, Wheeler County, GA, Wilcox County, GA, Worth County, GA

The watches that followed

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

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 4.3 hours before the alert went out and 60 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 2015-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 836 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 2015-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 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
836 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
1058 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
-2 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
Jun 30, 7:59 AM CDTMesoscale DiscussionSPCBullock, Chambers, Clay, Cleburne, Elmore, Lee and 4 more2 hr
Jun 30, 11:38 AM CDTMesoscale DiscussionSPCBaldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 4 more97 min
Jun 30, 1:06 PM CDTSevere Thunderstorm WatchSPCBaldwin, Coffee, Covington, Crenshaw, Dale, Escambia and 4 more6 hr
Jun 30, 12:57 PM CDTSevere Thunderstorm WatchSPCAlachua, Baker, Bradford, Columbia, Gilchrist, Hamilton and 2 more7 hr
Jun 30, 3:51 PM CDTMesoscale DiscussionSPCAlachua, Bradford, Calhoun, Clay, Columbia, Gadsden and 11 more114 min
Jun 30, 11:55 AM CDTMesoscale DiscussionSPCFannin, Rabun, Towns, Union3 hr
Jun 30, 12:01 PM CDTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bibb, Bleckley, Bulloch and 66 more89 min
Jun 30, 12:37 PM CDTSevere Thunderstorm WatchSPCElbert, Franklin, Habersham, Hart, Rabun, Stephens7 hr
Jun 30, 12:53 PM CDTSevere Thunderstorm WatchSPCBaldwin, Banks, Barrow, Bibb, Bleckley, Bryan and 64 more6 hr
Jun 30, 3:33 PM CDTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bibb, Bleckley, Bulloch and 53 more117 min
Jun 30, 6:08 PM CDTMesoscale DiscussionSPCCatoosa, Fannin, Franklin, Gilmer, Habersham, Hart and 7 more67 min

Nearby

Mesoscale Discussions in Georgia, 2015Mesoscale Discussions in Florida, 2015Mesoscale Discussions in Alabama, 2015Every mesoscale discussion in 2015

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.