Alert archive / Georgia / Mesoscale Discussions in 2004

Mesoscale Discussion 298

April 8, 2004Nassau County, Florida; 23 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2004, 3:40 PM EDT for Nassau County, Florida; 23 counties in Georgia. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Apr 8, 2004, 3:40 PM EDT (19:40 UTC)
Expired: Apr 8, 2004, 4:45 PM EDT
In force: 65 min
Issued by: the Storm Prediction Center

All 24 counties

Nassau County, FL, Brantley County, GA, Bryan County, GA, Bulloch County, GA, Camden County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Echols County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glynn County, GA, Jenkins County, GA, Johnson County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Screven County, GA, Tattnall County, GA, Ware County, GA, Wayne County, GA

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 7.7 hours before the alert went out and 143 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: 406 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 468 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 117 m²/s²
0-3 km storm-relative helicity: 216 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

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 8, 9:50 AM EDT	Mesoscale Discussion	SPC	Calhoun, Gadsden, Holmes, Jackson, Jefferson, Leon and 5 more	85 min
Apr 8, 10:10 AM EDT	Severe Thunderstorm Watch	SPC	Escambia, Gadsden, Hamilton, Holmes, Jackson, Leon and 5 more	7 hr
Apr 8, 10:16 AM EDT	Mesoscale Discussion	SPC	Alachua, Bradford, Citrus, Clay, Duval, Flagler and 13 more	119 min
Apr 8, 10:45 AM EDT	Severe Thunderstorm Watch	SPC	Alachua, Bradford, Citrus, Clay, Flagler, Gilchrist and 11 more	6 hr
Apr 8, 12:42 PM EDT	Mesoscale Discussion	SPC	Alachua, Bradford, Citrus, Clay, Flagler, Gilchrist and 11 more	2 hr
Apr 8, 1:11 PM EDT	Mesoscale Discussion	SPC	Escambia, Gadsden, Hamilton, Holmes, Jackson, Leon and 5 more	2 hr
Apr 8, 3:35 PM EDT	Mesoscale Discussion	SPC	Brevard, Hardee, Highlands, Hillsborough, Indian River, Okeechobee and 6 more	55 min
Apr 8, 1:56 PM EDT	Mesoscale Discussion	SPC	Baldwin, Barrow, Bibb, Bleckley, Bulloch, Burke and 58 more	3 hr

Nearby

Mesoscale Discussions in Georgia, 2004 Mesoscale Discussions in Florida, 2004 Every mesoscale discussion in 2004

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.