Alert archive / Georgia / Mesoscale Discussions in 2007

Mesoscale Discussion 493

April 14, 2007Nassau County, Florida; 17 counties in Georgia; Jasper County, South Carolina

The Storm Prediction Center issued this mesoscale discussion at Apr 14, 2007, 5:53 PM EDT for Nassau County, Florida; 17 counties in Georgia; Jasper County, South Carolina. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Apr 14, 2007, 5:53 PM EDT (21:53 UTC)
Expired: Apr 14, 2007, 7:30 PM EDT
In force: 97 min
Issued by: the Storm Prediction Center

Counties Nassau County, FL, Appling County, GA, Brantley County, GA, Bryan County, GA, Bulloch County, GA, Camden County, GA, Candler 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, Screven County, GA, Tattnall County, GA, Wayne County, GA, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 121 km from the middle of the area, began a volume at 21:57 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, 9.9 hours before the alert went out and 206 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: 1360 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 228 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
Apr 14, 11:07 AM EDT	Mesoscale Discussion	SPC	Escambia, Okaloosa, Santa Rosa	53 min
Apr 14, 11:26 AM EDT	Tornado Watch	SPC	Bay, Calhoun, Escambia, Gulf, Holmes, Jackson and 4 more	7 hr
Apr 14, 3:12 PM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gulf, Holmes, Jackson and 4 more	63 min
Apr 14, 3:40 PM EDT	Mesoscale Discussion	SPC	Baker, Columbia, Franklin, Gadsden, Hamilton, Jefferson and 7 more	65 min
Apr 14, 4:35 PM EDT	Tornado Watch	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 8 more	7 hr
Apr 14, 6:04 PM EDT	Mesoscale Discussion	SPC	Escambia, Okaloosa, Santa Rosa	56 min
Apr 14, 6:26 PM EDT	Tornado Watch	SPC	Escambia, Okaloosa, Santa Rosa	6 hr
Apr 14, 1:24 PM EDT	Mesoscale Discussion	SPC	Bartow, Catoosa, Chattooga, Dade, Fannin, Floyd and 8 more	66 min

Nearby

Mesoscale Discussions in Georgia, 2007 Mesoscale Discussions in Florida, 2007 Mesoscale Discussions in South Carolina, 2007 Every mesoscale discussion in 2007

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.