Alert archive / Florida / Mesoscale Discussions in 2005

Mesoscale Discussion 666

April 22, 200511 counties in Florida; 6 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2005, 10:15 PM EDT for 11 counties in Florida; 6 counties in Georgia. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued: Apr 22, 2005, 10:15 PM EDT (02:15 UTC)
Expired: Apr 22, 2005, 11:15 PM EDT
In force: 60 min
Issued by: the Storm Prediction Center

Counties Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Hamilton County, FL, Lafayette County, FL, Nassau County, FL, Saint Johns County, FL, Suwannee County, FL, Union County, FL, Brantley County, GA, Camden County, GA, Charlton County, GA, Glynn County, GA, McIntosh County, GA, Pierce County, GA

The radar

The Jacksonville radar (KJAX), 32 km from the middle of the area, began a volume at 02:18 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.

Severe Thunderstorm Watch 199Apr 23, 12:15 AM EDT

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 2.3 hours before the alert went out and 223 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 407 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 1494 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

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.

Issued	Product	Office	Counties	Lasted
Apr 22, 9:28 PM EDT	Mesoscale Discussion	SPC	Escambia, Santa Rosa	2 hr
Apr 22, 11:58 PM EDT	Mesoscale Discussion	SPC	Baker, Calhoun, Columbia, Franklin, Gadsden, Gilchrist and 9 more	32 min
Apr 23, 12:15 AM EDT	Severe Thunderstorm Watch	SPC	Calhoun, Columbia, Gadsden, Gilchrist, Gulf, Hamilton and 9 more	4 hr
Apr 23, 3:28 AM EDT	Mesoscale Discussion	SPC	Alachua, Bay, Bradford, Calhoun, Dixie, Flagler and 18 more	92 min
Apr 22, 9:50 PM EDT	Severe Thunderstorm Watch	SPC	Carroll, Chattahoochee, Coweta, Douglas, Fayette, Haralson and 10 more	5 hr
Apr 22, 10:43 PM EDT	Mesoscale Discussion	SPC	Cobb, Forsyth, Paulding, Polk	62 min
Apr 22, 11:01 PM EDT	Mesoscale Discussion	SPC	Atkinson, Baker, Berrien, Brooks, Calhoun, Charlton and 23 more	89 min
Apr 23, 12:14 AM EDT	Mesoscale Discussion	SPC	Carroll, Clayton, Coweta, Douglas, Fayette, Fulton and 7 more	91 min

Nearby

Mesoscale Discussions in Florida, 2005 Mesoscale Discussions in Georgia, 2005 Every 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.