Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 325

March 29, 200914 counties in Florida; 16 counties in Georgia; 8 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Mar 29, 2009, 12:48 AM EDT for 14 counties in Florida; 16 counties in Georgia; 8 counties in South Carolina. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Mar 29, 2009, 12:48 AM EDT (04:48 UTC)
Expired: Mar 29, 2009, 2:15 AM EDT
In force: 87 min
Issued by: the Storm Prediction Center

All 38 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Gilchrist County, FL, Levy County, FL, Marion County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Union County, FL, Brantley County, GA, Bryan County, GA, Bulloch County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Tattnall County, GA, Ware County, GA, Wayne County, GA, Beaufort County, SC, Berkeley County, SC, Charleston County, SC, Colleton County, SC, Dorchester County, SC, Hampton County, SC, Jasper County, SC, Williamsburg County, SC

The radar

The Jacksonville radar (KJAX), 73 km from the middle of the area, began a volume at 04:51 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

Jacksonville, FL (KJAX), launched 00:00Z, 4.8 hours before the alert went out and 71 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: 264 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1552 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 84 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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
Mar 29, 2:09 AM EDT	Mesoscale Discussion	SPC	Alachua, Bradford, Citrus, Clay, Duval, Flagler and 13 more	66 min
Mar 28, 8:21 PM EDT	Mesoscale Discussion	SPC	Catoosa, Chattooga, Dade, Fannin, Floyd, Gilmer and 4 more	54 min
Mar 28, 8:29 PM EDT	Tornado Watch	SPC	Bartow, Carroll, Catoosa, Chattooga, Dade, Floyd and 7 more	4 hr
Mar 28, 10:42 PM EDT	Mesoscale Discussion	SPC	Bartow, Carroll, Catoosa, Chattooga, Dade, Douglas and 10 more	63 min
Mar 28, 8:06 PM EDT	Mesoscale Discussion	SPC	Darlington, Dillon, Florence, Georgetown, Horry, Marion and 2 more	84 min

Nearby

Mesoscale Discussions in Georgia, 2009 Mesoscale Discussions in Florida, 2009 Mesoscale Discussions in South Carolina, 2009 Every mesoscale discussion in 2009

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.