Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 182

March 1, 200916 counties in Florida; 21 counties in Georgia; 10 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Mar 1, 2009, 6:17 AM EST for 16 counties in Florida; 21 counties in Georgia; 10 counties in South Carolina. It was in force for 118 min.

The area

The outline as issued.

The facts

Issued: Mar 1, 2009, 6:17 AM EST (11:17 UTC)
Expired: Mar 1, 2009, 8:15 AM EST
In force: 118 min
Issued by: the Storm Prediction Center

All 47 counties

Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Lafayette 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, Candler County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Echols County, GA, Effingham County, GA, Evans County, GA, Glynn County, GA, Jenkins 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, Allendale County, SC, Bamberg County, SC, 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 Charleston,SC radar (KCLX), 97 km from the middle of the area, began a volume at 11:18 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 nearest sounding before it

Jacksonville, FL (KJAX), launched 00:00Z, 11.3 hours before the alert went out and 152 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1572 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 172 m²/s²
0-3 km storm-relative helicity: 244 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
Feb 28, 9:48 PM EST	Mesoscale Discussion	SPC	Baker, Bay, Calhoun, Columbia, Dixie, Duval and 18 more	57 min
Mar 1, 1:55 AM EST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 15 more	95 min
Mar 1, 2:41 AM EST	Tornado Watch	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 10 more	7 hr
Mar 1, 8:18 AM EST	Mesoscale Discussion	SPC	Clay, Duval, Flagler, Nassau, Putnam, Saint Johns	87 min
Mar 1, 4:04 AM EST	Mesoscale Discussion	SPC	Burke, Candler, Dodge, Emanuel, Jenkins, Johnson and 6 more	86 min
Mar 1, 12:19 PM EST	Mesoscale Discussion	SPC	Baldwin, Banks, Barrow, Bartow, Bibb, Butts and 65 more	4 hr
Mar 1, 3:40 PM EST	Mesoscale Discussion	SPC	Banks, Barrow, Butts, Cherokee, Clarke, Clayton and 41 more	4 hr

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.