Alert archive / Florida / Mesoscale Discussions in 2009

Mesoscale Discussion 2184

December 2, 200910 counties in Alabama; 15 counties in Florida; 14 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Dec 2, 2009, 5:02 AM CST for 10 counties in Alabama; 15 counties in Florida; 14 counties in Georgia. It was in force for 58 min.

The area

The outline as issued.

The facts

Issued: Dec 2, 2009, 5:02 AM CST (11:02 UTC)
Expired: Dec 2, 2009, 6:00 AM CST
In force: 58 min
Issued by: the Storm Prediction Center

All 39 counties

Baldwin County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Mobile County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Leon County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Calhoun County, GA, Clay County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Lee County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA

The radar

The Eglin Afb radar (KEVX), 33 km from the middle of the area, began a volume at 11:05 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 11.0 hours before the alert went out and 189 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: 598 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 306 m²/s²
0-3 km storm-relative helicity: 388 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
Dec 1, 11:10 PM CST	Mesoscale Discussion	SPC	Baldwin, Covington, Escambia, Geneva	2 hr
Dec 2, 3:11 AM CST	Tornado Watch	SPC	Baldwin, Coffee, Conecuh, Covington, Dale, Escambia and 4 more	6 hr
Dec 2, 8:52 AM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Columbia, Dixie, Gilchrist and 9 more	83 min
Dec 2, 9:32 AM CST	Tornado Watch	SPC	Columbia, Dixie, Franklin, Gadsden, Gilchrist, Hamilton and 8 more	6 hr
Dec 2, 11:48 AM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Columbia, Dixie, Gilchrist and 9 more	117 min
Dec 2, 1:46 PM CST	Tornado Watch	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 14 more	7 hr
Dec 2, 5:39 PM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 12 more	96 min
Dec 2, 12:31 PM CST	Mesoscale Discussion	SPC	Baldwin, Bleckley, Bryan, Bulloch, Burke, Candler and 23 more	89 min
Dec 2, 1:08 PM CST	Tornado Watch	SPC	Bryan, Bulloch, Burke, Candler, Chatham, Columbia and 11 more	8 hr
Dec 2, 4:44 PM CST	Mesoscale Discussion	SPC	Bryan, Bulloch, Burke, Candler, Chatham, Columbia and 11 more	91 min

Nearby

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