Alert archive / Florida / Mesoscale Discussions in 2009

Mesoscale Discussion 2292

December 24, 2009Houston County, Alabama; 10 counties in Florida; Decatur County, Seminole County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Dec 24, 2009, 9:45 PM CST for Houston County, Alabama; 10 counties in Florida; Decatur County, Seminole County, Georgia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Dec 24, 2009, 9:45 PM CST (03:45 UTC)
Expired: Dec 24, 2009, 11:45 PM CST
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Houston County, AL, Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Jackson County, FL, Leon County, FL, Liberty County, FL, Wakulla County, FL, Washington County, FL, Decatur County, GA, Seminole County, GA

The radar

The Eglin Afb radar (KEVX), 79 km from the middle of the area, began a volume at 03:46 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, 3.8 hours before the alert went out and 95 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: -94 J/kg
Mixed-layer LCL: 909 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 500 m²/s²
0-3 km storm-relative helicity: 677 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 24, 7:32 PM CST	Mesoscale Discussion	SPC	Coffee, Covington, Geneva, Houston	118 min
Dec 25, 2:27 AM CST	Mesoscale Discussion	SPC	Alachua, Baker, Citrus, Columbia, Dixie, Gilchrist and 7 more	63 min
Dec 25, 2:46 AM CST	Tornado Watch	SPC	Alachua, Baker, Bradford, Columbia, Dixie, Gilchrist and 8 more	7 hr
Dec 25, 6:27 AM CST	Mesoscale Discussion	SPC	Baker, Columbia, Dixie, Gilchrist, Hamilton, Lafayette and 3 more	93 min
Dec 25, 3:41 AM CST	Mesoscale Discussion	SPC	Appling, Bryan, Bulloch, Burke, Camden, Candler and 24 more	64 min
Dec 25, 4:01 AM CST	Tornado Watch	SPC	Bryan, Bulloch, Burke, Candler, Chatham, Dodge and 20 more	9 hr
Dec 25, 9:26 AM CST	Mesoscale Discussion	SPC	Appling, Bacon, Brantley, Camden, Charlton, Glynn and 3 more	64 min
Dec 25, 10:39 AM CST	Mesoscale Discussion	SPC	Bryan, Chatham, Effingham, Liberty, McIntosh	66 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.