Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 357

April 4, 20115 states

The Storm Prediction Center issued this mesoscale discussion at Apr 4, 2011, 11:21 PM CDT for 5 states. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued
Apr 4, 2011, 11:21 PM CDT (04:21 UTC)
Expired
Apr 5, 2011, 12:45 AM CDT
In force
84 min
Issued by
the Storm Prediction Center
All 112 counties

Barbour County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Liberty County, FL, Okaloosa County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Baldwin County, GA, Bibb County, GA, Bleckley County, GA, Butts County, GA, Calhoun County, GA, Chattahoochee County, GA, Clarke County, GA, Clay County, GA, Columbia County, GA, Crawford County, GA, Crisp County, GA, Decatur County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Glascock County, GA, Grady County, GA, Greene County, GA, Hancock County, GA, Houston County, GA, Jasper County, GA, Jefferson County, GA, Johnson County, GA, Jones County, GA, Lamar County, GA, Laurens County, GA, Lee County, GA, Lincoln County, GA, Macon County, GA, Marion County, GA, McDuffie County, GA, Miller County, GA, Mitchell County, GA, Monroe County, GA, Morgan County, GA, Muscogee County, GA, Newton County, GA, Oconee County, GA, Oglethorpe County, GA, Peach County, GA, Pike County, GA, Pulaski County, GA, Putnam County, GA, Quitman County, GA, Randolph County, GA, Richmond County, GA, Schley County, GA, Seminole County, GA, Spalding County, GA, Stewart County, GA, Sumter County, GA, Talbot County, GA, Taliaferro County, GA, Taylor County, GA, Terrell County, GA, Turner County, GA, Twiggs County, GA, Upson County, GA, Walton County, GA, Warren County, GA, Washington County, GA, Webster County, GA, Wilcox County, GA, Wilkes County, GA, Wilkinson County, GA, Worth County, GA, Alamance County, NC, Anson County, NC, Chatham County, NC, Cumberland County, NC, Harnett County, NC, Hoke County, NC, Lee County, NC, Montgomery County, NC, Moore County, NC, Randolph County, NC, Richmond County, NC, Robeson County, NC, Scotland County, NC, Aiken County, SC, Calhoun County, SC, Chesterfield County, SC, Darlington County, SC, Dillon County, SC, Edgefield County, SC, Fairfield County, SC, Kershaw County, SC, Lancaster County, SC, Lee County, SC, Lexington County, SC, Marlboro County, SC, McCormick County, SC, Richland County, SC, Saluda County, SC, Sumter County, SC

The radar

The Columbia radar (KCAE), 119 km from the middle of the area, began a volume at 04:22 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, 4.4 hours before the alert went out and 206 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 2011-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 176 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, Peachtre/Fal Fld, GA at 00:00Z on 2011-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 158 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
176 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1790 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
158 m²/s²
0-3 km storm-relative helicity
251 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.0

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 4, 9:05 PM CDTMesoscale DiscussionSPCGeneva, Henry, Houston55 min
Apr 4, 9:28 PM CDTTornado WatchSPCBarbour, Bullock, Coffee, Dale, Geneva, Henry and 3 more6 hr
Apr 5, 1:41 AM CDTTornado WatchSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 19 more6 hr
Apr 5, 1:55 AM CDTMesoscale DiscussionSPCAlachua, Baker, Bay, Bradford, Calhoun, Clay and 22 more2 hr
Apr 5, 4:39 AM CDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 25 more2 hr
Apr 5, 6:04 AM CDTSevere Thunderstorm WatchSPCBrevard, DeSoto, Hardee, Hernando, Highlands, Hillsborough and 15 more7 hr
Apr 5, 7:30 AM CDTMesoscale DiscussionSPCBrevard, Broward, Charlotte, Collier, DeSoto, Glades and 20 more2 hr
Apr 5, 10:02 AM CDTMesoscale DiscussionSPCBroward, Collier, Glades, Hendry, Highlands, Indian River and 7 more118 min
Apr 4, 8:18 PM CDTMesoscale DiscussionSPCBartow, Carroll, Cherokee, Cobb, DeKalb, Douglas and 6 more87 min
Apr 4, 8:45 PM CDTSevere Thunderstorm WatchSPCElbert, Franklin, Habersham, Hart, Rabun, Stephens5 hr
Apr 4, 11:48 PM CDTTornado WatchSPCBurke, Columbia, Lincoln, McDuffie, Richmond5 hr
Apr 5, 2:34 AM CDTMesoscale DiscussionSPCBurke116 min
Apr 4, 8:32 PM CDTMesoscale DiscussionSPCAlexander, Buncombe, Burke, Catawba, Cleveland, Gaston and 8 more58 min
Apr 4, 11:36 PM CDTSevere Thunderstorm WatchSPCAlleghany, Caswell, Rockingham, Stokes, Surry, Wilkes and 1 more111 min
Apr 5, 1:13 AM CDTMesoscale DiscussionSPCForsyth, Rockingham, Stokes, Surry, Yadkin32 min
Apr 5, 1:18 AM CDTTornado WatchSPCBertie, Camden, Caswell, Chowan, Currituck, Gates and 5 more8 hr
Apr 5, 1:24 AM CDTMesoscale DiscussionSPCCabarrus, Mecklenburg, Rowan66 min
Apr 5, 3:00 AM CDTTornado WatchSPCBeaufort, Bladen, Brunswick, Carteret, Columbus, Craven and 15 more6 hr
Apr 5, 6:08 AM CDTMesoscale DiscussionSPCBeaufort, Brunswick, Carteret, Craven, Currituck, Dare and 10 more2 hr
Apr 5, 9:15 AM CDTMesoscale DiscussionSPCBeaufort, Bertie, Bladen, Brunswick, Camden, Carteret and 26 more90 min

Nearby

Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in South Carolina, 2011Mesoscale Discussions in North Carolina, 2011Every mesoscale discussion in 2011

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.