Alert archive / Florida / Mesoscale Discussions in 2011

Mesoscale Discussion 363

April 5, 201131 counties in Florida; 7 counties in Georgia; Beaufort County, Charleston County, South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2011, 5:39 AM EDT for 31 counties in Florida; 7 counties in Georgia; Beaufort County, Charleston County, South Carolina. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Apr 5, 2011, 5:39 AM EDT (09:39 UTC)
Expired
Apr 5, 2011, 7:45 AM EDT
In force
2 hr
Issued by
the Storm Prediction Center
All 40 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hardee County, FL, Hernando County, FL, Hillsborough County, FL, Lafayette County, FL, Lake County, FL, Levy County, FL, Manatee County, FL, Marion County, FL, Nassau County, FL, Orange County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Putnam County, FL, Saint Johns County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Suwannee County, FL, Union County, FL, Volusia County, FL, Brantley County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Glynn County, GA, Liberty County, GA, McIntosh County, GA, Beaufort County, SC, Charleston County, SC

The radar

The Jacksonville radar (KJAX), 54 km from the middle of the area, began a volume at 09:38 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

Jacksonville, FL (KJAX), launched 00:00Z, 9.7 hours before the alert went out and 55 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.

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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, 2:55 AM EDTMesoscale DiscussionSPCAlachua, Baker, Bay, Bradford, Calhoun, Clay and 22 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 Florida, 2011Mesoscale Discussions in Georgia, 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; radar from the NEXRAD Level II archive.