Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 216

March 9, 201113 counties in Florida; 20 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 9, 2011, 12:38 PM CST for 13 counties in Florida; 20 counties in Georgia. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Mar 9, 2011, 12:38 PM CST (18:38 UTC)
Expired: Mar 9, 2011, 1:45 PM CST
In force: 67 min
Issued by: the Storm Prediction Center

All 33 counties

Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Grady County, GA, Irwin County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 41 km from the middle of the area, began a volume at 18:37 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 12:00Z, 6.6 hours before the alert went out and 42 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: 611 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 348 m²/s²
0-3 km storm-relative helicity: 471 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
Mar 9, 7:26 AM CST	Tornado Watch	SPC	Escambia, Okaloosa, Santa Rosa	6 hr
Mar 9, 8:32 AM CST	Mesoscale Discussion	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 8 more	28 min
Mar 9, 8:39 AM CST	Tornado Watch	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 7 more	7 hr
Mar 9, 9:31 AM CST	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 10 more	59 min
Mar 9, 11:09 AM CST	Mesoscale Discussion	SPC	Escambia, Okaloosa, Santa Rosa	66 min
Mar 9, 1:04 PM CST	Mesoscale Discussion	SPC	Nassau	26 min
Mar 9, 3:14 PM CST	Mesoscale Discussion	SPC	Madison	31 min
Mar 9, 1:21 PM CST	Severe Thunderstorm Watch	SPC	Appling, Atkinson, Bacon, Brantley, Bryan, Bulloch and 29 more	6 hr
Mar 9, 3:38 PM CST	Mesoscale Discussion	SPC	Brantley, Bryan, Bulloch, Camden, Charlton, Chatham and 14 more	67 min

Nearby

Mesoscale Discussions in Georgia, 2011 Mesoscale Discussions in Florida, 2011 Every mesoscale discussion in 2011

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.