Alert archive / Georgia / Mesoscale Discussions in 2009

Mesoscale Discussion 2144

October 27, 200910 counties in Florida; 13 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Oct 27, 2009, 4:43 PM EDT for 10 counties in Florida; 13 counties in Georgia. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Oct 27, 2009, 4:43 PM EDT (20:43 UTC)
Expired: Oct 27, 2009, 6:15 PM EDT
In force: 92 min
Issued by: the Storm Prediction Center

All 23 counties

Baker County, FL, Columbia County, FL, Dixie County, FL, Hamilton County, FL, Lafayette County, FL, Madison County, FL, Nassau County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Atkinson County, GA, Brantley County, GA, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Cook County, GA, Echols County, GA, Lanier County, GA, Lowndes County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 8.7 hours before the alert went out and 110 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: 1086 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 451 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 189 m²/s²
0-3 km storm-relative helicity: 255 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.3

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
Oct 27, 8:32 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 7 more	88 min
Oct 27, 9:14 AM EDT	Tornado Watch	SPC	Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 13 more	8 hr
Oct 27, 11:24 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Gadsden, Gulf, Jackson, Jefferson and 5 more	2 hr
Oct 27, 2:57 PM EDT	Mesoscale Discussion	SPC	Jefferson, Leon, Madison, Wakulla	2 hr
Oct 27, 3:43 PM EDT	Mesoscale Discussion	SPC	Bryan, Chatham, Liberty	2 hr
Oct 27, 6:56 PM EDT	Mesoscale Discussion	SPC	Chatham, Effingham	94 min
Oct 27, 7:08 PM EDT	Tornado Watch	SPC	Bryan, Chatham, Effingham	3 hr

Nearby

Mesoscale Discussions in Georgia, 2009 Mesoscale Discussions in Florida, 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.