Alert archive / Georgia / Mesoscale Discussions in 2008

Mesoscale Discussion 1633

June 29, 200810 counties in Florida; 12 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jun 29, 2008, 3:51 PM EDT for 10 counties in Florida; 12 counties in Georgia. It was in force for 54 min.

The area

The outline as issued.

The facts

Issued: Jun 29, 2008, 3:51 PM EDT (19:51 UTC)
Expired: Jun 29, 2008, 4:45 PM EDT
In force: 54 min
Issued by: the Storm Prediction Center

All 22 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Union County, FL, Appling County, GA, Bacon County, GA, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Glynn County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA

The radar

The Jacksonville radar (KJAX), 7 km from the middle of the area, began a volume at 19:54 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 7.9 hours before the alert went out and 246 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: 2230 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 748 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 65 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jun 29, 10:38 AM EDT	Mesoscale Discussion	SPC	Gadsden, Hamilton, Jefferson, Leon, Madison	2 hr
Jun 29, 11:47 AM EDT	Severe Thunderstorm Watch	SPC	Calhoun, Escambia, Gadsden, Holmes, Jackson, Jefferson and 6 more	7 hr
Jun 29, 1:12 PM EDT	Severe Thunderstorm Watch	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 9 more	8 hr
Jun 29, 2:04 PM EDT	Mesoscale Discussion	SPC	Calhoun, Gadsden, Holmes, Jackson, Jefferson, Leon and 5 more	56 min
Jun 29, 12:34 PM EDT	Mesoscale Discussion	SPC	Bulloch, Burke, Columbia, Effingham, Emanuel, Glascock and 5 more	56 min
Jun 29, 1:35 PM EDT	Severe Thunderstorm Watch	SPC	Bulloch, Burke, Candler, Columbia, Effingham, Jenkins and 4 more	7 hr
Jun 29, 2:43 PM EDT	Severe Thunderstorm Watch	SPC	Baldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 75 more	6 hr
Jun 29, 4:46 PM EDT	Mesoscale Discussion	SPC	Bryan, Bulloch, Burke, Effingham, Evans, Jefferson and 3 more	59 min
Jun 29, 5:18 PM EDT	Mesoscale Discussion	SPC	Baldwin, Banks, Barrow, Bartow, Bibb, Butts and 63 more	57 min

Nearby

Mesoscale Discussions in Georgia, 2008 Mesoscale Discussions in Florida, 2008 Every mesoscale discussion in 2008

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.