Alert archive / Florida / Mesoscale Discussions in 2009

Mesoscale Discussion 183

March 1, 20096 counties in Florida; 4 counties in Georgia; Beaufort County, Jasper County, South Carolina

The Storm Prediction Center issued this mesoscale discussion at Mar 1, 2009, 8:18 AM EST for 6 counties in Florida; 4 counties in Georgia; Beaufort County, Jasper County, South Carolina. It was in force for 87 min.

The area

The outline as issued.

The facts

Issued: Mar 1, 2009, 8:18 AM EST (13:18 UTC)
Expired: Mar 1, 2009, 9:45 AM EST
In force: 87 min
Issued by: the Storm Prediction Center

Counties Clay County, FL, Duval County, FL, Flagler County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Camden County, GA, Chatham County, GA, Glynn County, GA, McIntosh County, GA, Beaufort County, SC, Jasper County, SC

The radar

The Jacksonville radar (KJAX), 139 km from the middle of the area, began a volume at 13:21 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

Charleston AFB, SC (KCHS), launched 12:00Z, 1.3 hours before the alert went out and 212 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: 1 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 696 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 168 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, 6:17 AM EST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Dixie and 10 more	118 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 Florida, 2009 Mesoscale Discussions in Georgia, 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.