Alert archive / Florida / Mesoscale Discussions in 2013

Mesoscale Discussion 237

February 26, 201325 counties in Florida; 17 counties in Georgia; 12 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Feb 26, 2013, 11:38 AM EST for 25 counties in Florida; 17 counties in Georgia; 12 counties in South Carolina. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Feb 26, 2013, 11:38 AM EST (16:38 UTC)
Expired
Feb 26, 2013, 12:45 PM EST
In force
67 min
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 54 counties

Charlotte County, FL, Citrus County, FL, Clay County, FL, DeSoto County, FL, Duval County, FL, Flagler County, FL, Hardee County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Lake County, FL, Manatee County, FL, Marion County, FL, Nassau County, FL, Orange County, FL, Osceola 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, Volusia County, FL, Bryan County, GA, Bulloch County, GA, Burke County, GA, Camden County, GA, Candler County, GA, Chatham County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Jenkins County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Screven County, GA, Tattnall County, GA, Toombs County, GA, Wayne County, GA, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Clarendon County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC, Orangeburg County, SC

The radar

The Jacksonville radar (KJAX), 111 km from the middle of the area, began a volume at 16:40 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

Jacksonville, FL (KJAX), launched 12:00Z, 4.6 hours before the alert went out and 113 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 12:00Z on 2013-02-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 358 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 12:00Z on 2013-02-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 308 square meters per square second.1939587897Sfc1 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
358 J/kg
Mixed-layer CIN
-57 J/kg
Mixed-layer LCL
933 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
308 m²/s²
0-3 km storm-relative helicity
343 m²/s²
Significant tornado parameter
0.7
Supercell composite
4.6

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
Feb 25, 8:57 PM ESTMesoscale DiscussionSPCEscambia, Santa Rosa63 min
Feb 25, 10:31 PM ESTMesoscale DiscussionSPCBay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 10 more59 min
Feb 26, 12:59 AM ESTTornado WatchSPCBay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 12 more8 hr
Feb 26, 3:51 AM ESTMesoscale DiscussionSPCCalhoun, Dixie, Gadsden, Gulf, Hamilton, Jackson and 8 more114 min
Feb 26, 6:19 AM ESTMesoscale DiscussionSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 16 more116 min
Feb 26, 6:49 AM ESTTornado WatchSPCAlachua, Baker, Bradford, Brevard, Charlotte, Citrus and 31 more8 hr
Feb 26, 8:44 AM ESTMesoscale DiscussionSPCBulloch, Effingham, Screven3 hr
Feb 26, 2:44 PM ESTMesoscale DiscussionSPCBeaufort, Berkeley, Charleston, Clarendon, Colleton, Dorchester and 7 more91 min
Feb 26, 6:17 PM ESTMesoscale DiscussionSPCDillon, Georgetown, Horry, Marion118 min

Nearby

Mesoscale Discussions in Florida, 2013Mesoscale Discussions in Georgia, 2013Mesoscale Discussions in South Carolina, 2013Every mesoscale discussion in 2013

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.