Alert archive / Florida / Mesoscale Discussions in 2005

Mesoscale Discussion 520

April 7, 200542 counties in Florida; Camden County, Charlton County, Glynn County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 7, 2005, 4:18 PM EDT for 42 counties in Florida; Camden County, Charlton County, Glynn County, Georgia. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued
Apr 7, 2005, 4:18 PM EDT (20:18 UTC)
Expired
Apr 7, 2005, 5:45 PM EDT
In force
87 min
Issued by
the Storm Prediction Center
All 45 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Brevard County, FL, Charlotte County, FL, Citrus County, FL, Clay County, FL, Collier County, FL, Columbia County, FL, DeSoto County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lake County, FL, Lee County, FL, Levy County, FL, Manatee County, FL, Marion County, FL, Martin County, FL, Nassau County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Putnam County, FL, Saint Johns County, FL, Saint Lucie County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Suwannee County, FL, Union County, FL, Volusia County, FL, Camden County, GA, Charlton County, GA, Glynn County, GA

The radar

The Melbourne radar (KMLB), 87 km from the middle of the area, began a volume at 20:20 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

Tampa Bay, FL (KTBW), launched 12:00Z, 8.3 hours before the alert went out and 91 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, Tampa Bay, FL at 12:00Z on 2005-04-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 31 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, Tampa Bay, FL at 12:00Z on 2005-04-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 237 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
31 J/kg
Mixed-layer CIN
-253 J/kg
Mixed-layer LCL
1011 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
237 m²/s²
0-3 km storm-relative helicity
309 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

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 6, 8:00 PM EDTSevere Thunderstorm WatchSPCBay, Calhoun, Gulf, Holmes, Jackson, Walton and 1 more4 hr
Apr 6, 11:36 PM EDTMesoscale DiscussionSPCBay, Calhoun, Gulf, Holmes, Jackson, Walton and 1 more54 min
Apr 7, 4:53 AM EDTMesoscale DiscussionSPCGulf, Jefferson, Lafayette, Leon, Liberty, Madison and 2 more2 hr
Apr 7, 8:52 AM EDTMesoscale DiscussionSPCAlachua, Citrus, Columbia, Dixie, Gilchrist, Lafayette and 4 more113 min
Apr 7, 11:25 AM EDTSevere Thunderstorm WatchSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 17 more8 hr
Apr 7, 1:00 PM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Citrus, Clay, Columbia and 17 more2 hr
Apr 7, 5:50 PM EDTSevere Thunderstorm WatchSPCBrevard, Charlotte, Citrus, DeSoto, Glades, Hardee and 20 more6 hr
Apr 7, 7:20 PM EDTMesoscale DiscussionSPCBrevard, Charlotte, Collier, DeSoto, Glades, Hardee and 17 more55 min
Apr 7, 12:50 AM EDTMesoscale DiscussionSPCCarroll, Chattahoochee, Chattooga, Coweta, Floyd, Haralson and 6 more55 min
Apr 7, 12:03 PM EDTMesoscale DiscussionSPCBartow, Carroll, Catoosa, Chattooga, Cherokee, Clayton and 27 more117 min
Apr 7, 5:52 PM EDTMesoscale DiscussionSPCAtkinson, Bacon, Baker, Baldwin, Barrow, Ben Hill and 92 more23 min

Nearby

Mesoscale Discussions in Florida, 2005Mesoscale Discussions in Georgia, 2005Every mesoscale discussion in 2005

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.