Alert archive / Florida / Mesoscale Discussions in 2006

Mesoscale Discussion 478

April 8, 200622 counties in Florida; 6 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2006, 6:59 PM EDT for 22 counties in Florida; 6 counties in Georgia. It was in force for 91 min.

The area

The outline as issued.

The facts

Issued
Apr 8, 2006, 6:59 PM EDT (22:59 UTC)
Expired
Apr 8, 2006, 8:30 PM EDT
In force
91 min
Issued by
the Storm Prediction Center
All 28 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, Gilchrist County, FL, Hamilton County, FL, Hernando County, FL, Jefferson County, FL, Lafayette County, FL, Levy 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, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Lowndes County, GA, Ware County, GA

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 11.0 hours before the alert went out and 140 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 2006-04-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 491 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 2006-04-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 96 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
491 J/kg
Mixed-layer CIN
-253 J/kg
Mixed-layer LCL
489 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
96 m²/s²
0-3 km storm-relative helicity
78 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 8, 9:37 AM EDTMesoscale DiscussionSPCCalhoun, Escambia, Gadsden, Holmes, Jackson, Jefferson and 6 more113 min
Apr 8, 10:00 AM EDTTornado WatchSPCBay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 13 more7 hr
Apr 8, 12:00 PM EDTMesoscale DiscussionSPCBaker, Columbia, Duval, Nassau, Union2 hr
Apr 8, 1:30 PM EDTTornado WatchSPCAlachua, Baker, Bradford, Clay, Columbia, Duval and 7 more8 hr
Apr 8, 3:00 PM EDTMesoscale DiscussionSPCBay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 8 more2 hr
Apr 8, 4:22 PM EDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Clay, Columbia, Duval and 7 more113 min
Apr 8, 4:45 PM EDTTornado WatchSPCBay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 9 more4 hr
Apr 7, 9:20 PM EDTTornado WatchSPCBanks, Bartow, Carroll, Catoosa, Chattooga, Cherokee and 25 more10 hr
Apr 7, 11:16 PM EDTMesoscale DiscussionSPCDade89 min
Apr 8, 3:10 AM EDTTornado WatchSPCBaldwin, Barrow, Bibb, Butts, Chattahoochee, Clarke and 51 more6 hr
Apr 8, 3:45 AM EDTMesoscale DiscussionSPCBanks, Cherokee, Dawson, Forsyth, Franklin, Habersham and 8 more60 min
Apr 8, 7:42 AM EDTMesoscale DiscussionSPCBaldwin, Bibb, Bleckley, Chattahoochee, Crawford, Glascock and 13 more93 min

Nearby

Mesoscale Discussions in Florida, 2006Mesoscale Discussions in Georgia, 2006Every mesoscale discussion in 2006

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.