Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 360

April 5, 201128 counties in Florida; 61 counties in Georgia; 9 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2011, 2:55 AM EDT for 28 counties in Florida; 61 counties in Georgia; 9 counties in South Carolina. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 5, 2011, 2:55 AM EDT (06:55 UTC)
Expired
Apr 5, 2011, 5:00 AM EDT
In force
2 hr
Issued by
the Storm Prediction Center
All 98 counties

Alachua County, FL, Baker County, FL, Bay County, FL, Bradford County, FL, Calhoun County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Franklin County, FL, Gadsden County, FL, Gilchrist County, FL, Gulf County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Ben Hill County, GA, Berrien County, GA, Bleckley County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Camden County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dodge County, GA, Echols County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glascock County, GA, Glynn County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Lanier County, GA, Laurens County, GA, Liberty County, GA, Lincoln County, GA, Long County, GA, Lowndes County, GA, McDuffie County, GA, McIntosh County, GA, Mitchell County, GA, Montgomery County, GA, Pierce County, GA, Pulaski County, GA, Screven County, GA, Tattnall County, GA, Telfair County, GA, Thomas County, GA, Tift County, GA, Toombs County, GA, Treutlen County, GA, Turner County, GA, Ware County, GA, Warren County, GA, Washington County, GA, Wayne County, GA, Wheeler County, GA, Wilcox County, GA, Worth County, GA, Allendale County, SC, Bamberg County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC

The nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 6.9 hours before the alert went out and 123 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 00:00Z on 2011-04-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 64 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 00:00Z on 2011-04-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 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
64 J/kg
Mixed-layer CIN
-84 J/kg
Mixed-layer LCL
2067 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
66 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

938 
ACUS11 KWNS 050656
SWOMCD
SPC MCD 050655
SCZ000-FLZ000-GAZ000-050900-

MESOSCALE DISCUSSION 0360
NWS STORM PREDICTION CENTER NORMAN OK
0155 AM CDT TUE APR 05 2011

AREAS AFFECTED...PORTIONS ERN/SRN GA...SRN SC...NRN FL AND
CENTRAL/ERN PANHANDLE OF FL.

CONCERNING...TORNADO WATCH 102...98...

VALID 050655Z - 050900Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 102...98...CONTINUES.

SVR SQUALL LINE WITH EMBEDDED BOW/LEWP FORMATIONS WILL CONTINUE
MOVING EWD 40-50 KT ACROSS DISCUSSION AREA THROUGH REMAINDER
PRE-DAWN HOURS.  PRIMARY WIND DAMAGE THREAT WILL BE ACCOMPANIED BY
LOCALIZED POTENTIAL FOR TORNADOES ARISING FROM QLCS
MESOVORTICES...AND PERHAPS AN EMBEDDED SUPERCELL OR TWO.  GIVEN
STRONG CONVECTIVE STABILIZATION...AND THEN POST-FRONTAL
CAA...EXPECTED BEHIND QLCS...WWS MAY BE CLEARED IMMEDIATELY
FOLLOWING CONVECTION.

SFC MESOANALYSIS SHOWS WELL-DEFINED MOIST AXIS IMMEDIATELY AHEAD OF
CONVECTIVE BAND...CHARACTERIZED BY SFC DEW POINTS RANGING FROM LOW
60S F OVER SRN SC TO 70S FROM FL-GA BORDER SWD OVER NERN GULF.
BOUNDARY-LAYER MOISTURE TRANSPORT...AND MOIST ADVECTION OVER ERN
GA/SC AREA...WILL MAINTAIN FAVORABLE BUOYANCY AHEAD OF CONVECTION
WITH MLCAPE GENERALLY EXPECTED IN 700-1500 J/KG RANGE.  MODIFIED
FCST SOUNDINGS INDICATE LITTLE STRENGTHENING OF CINH AMIDST THAT
MOISTENING...SO FORCED ASCENT OF INFLOW LAYER WILL INCLUDE
EFFECTIVELY SFC-BASED PARCELS.  FAVORABLE DEEP-LAYER SHEAR WILL
CONTINUE WITH EFFECTIVE SHEAR MAGNITUDES RANGING FROM 45-55 KT OVER
ERN GA/SRN SC REGION...TO 35-45 KT OVER NRN FL.  VWP AND RUC
HODOGRAPHS EACH INDICATE EFFECTIVE SRH 450-500 J/KG OVER PORTIONS
ERN GA/SRN SC...TO 100-200 J/KG OVER NRN FL.

..EDWARDS.. 04/05/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...ILM...CHS...CAE...MLB...TBW...JAX...FFC...TAE...

LAT...LON   29598499 29668535 29918543 30058566 31638404 32308364
            32878299 33718269 33988239 33078222 33198119 33308021
            33177922 32997939 32488028 32168069 31738109 31198133
            30638144 29998135 29288106 29088205 29488338 29668342
            29758360 29968375 30118403 30058434 29888433 29908451
            29788460 29598499

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 4, 10:05 PM EDTMesoscale DiscussionSPCBay, Calhoun, Gadsden, Holmes, Jackson, Leon and 3 more55 min
Apr 4, 10:28 PM EDTTornado WatchSPCBay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 3 more6 hr
Apr 5, 12:21 AM EDTMesoscale DiscussionSPCBay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 4 more84 min
Apr 5, 2:41 AM EDTTornado WatchSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 19 more6 hr
Apr 5, 5:39 AM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 25 more2 hr
Apr 5, 7:04 AM EDTSevere Thunderstorm WatchSPCBrevard, DeSoto, Hardee, Hernando, Highlands, Hillsborough and 15 more7 hr
Apr 5, 8:30 AM EDTMesoscale DiscussionSPCBrevard, Broward, Charlotte, Collier, DeSoto, Glades and 20 more2 hr
Apr 5, 11:02 AM EDTMesoscale DiscussionSPCBroward, Collier, Glades, Hendry, Highlands, Indian River and 7 more118 min
Apr 4, 9:18 PM EDTMesoscale DiscussionSPCBartow, Carroll, Cherokee, Cobb, DeKalb, Douglas and 6 more87 min
Apr 4, 9:45 PM EDTSevere Thunderstorm WatchSPCElbert, Franklin, Habersham, Hart, Rabun, Stephens5 hr
Apr 5, 12:48 AM EDTTornado WatchSPCBurke, Columbia, Lincoln, McDuffie, Richmond5 hr
Apr 5, 3:34 AM EDTMesoscale DiscussionSPCBurke116 min
Apr 4, 9:32 PM EDTMesoscale DiscussionSPCAbbeville, Anderson, Cherokee, Greenville, Laurens, Oconee and 2 more58 min
Apr 5, 2:24 AM EDTMesoscale DiscussionSPCChester, Greenwood, Newberry66 min
Apr 5, 4:00 AM EDTTornado WatchSPCDarlington, Dillon, Florence, Georgetown, Horry, Marion and 2 more6 hr

Nearby

Mesoscale Discussions in Georgia, 2011Mesoscale Discussions in Florida, 2011Mesoscale Discussions in South 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.