Alert archive / Florida / Mesoscale Discussions in 2009

Mesoscale Discussion 293

March 27, 20099 counties in Florida; 5 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2009, 10:51 AM EDT for 9 counties in Florida; 5 counties in Georgia. It was in force for 24 min.

The area

The outline as issued.

The facts

Issued: Mar 27, 2009, 10:51 AM EDT (14:51 UTC)
Expired: Mar 27, 2009, 11:15 AM EDT
In force: 24 min
Issued by: the Storm Prediction Center

Counties Franklin County, FL, Gadsden County, FL, Gulf County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Taylor County, FL, Wakulla County, FL, Brooks County, GA, Decatur County, GA, Grady County, GA, Lowndes County, GA, Thomas County, GA

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 76Mar 27, 11:00 AM EDT

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 2.9 hours before the alert went out and 40 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: 31 J/kg
Mixed-layer CIN: -249 J/kg
Mixed-layer LCL: 674 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 230 m²/s²
0-3 km storm-relative helicity: 273 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 27, 12:53 AM EDT	Mesoscale Discussion	SPC	Escambia	97 min
Mar 27, 1:48 AM EDT	Tornado Watch	SPC	Escambia, Okaloosa, Santa Rosa	7 hr
Mar 27, 3:23 AM EDT	Mesoscale Discussion	SPC	Escambia, Okaloosa, Santa Rosa	67 min
Mar 27, 5:37 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Escambia, Gulf, Holmes, Jackson and 4 more	53 min
Mar 27, 6:02 AM EDT	Tornado Watch	SPC	Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 6 more	5 hr
Mar 27, 7:35 AM EDT	Mesoscale Discussion	SPC	Bay, Calhoun, Gulf, Holmes, Jackson, Okaloosa and 2 more	55 min
Mar 27, 11:05 AM EDT	Tornado Watch	SPC	Dixie, Franklin, Jefferson, Lafayette, Leon, Madison and 2 more	3 hr
Mar 27, 1:11 PM EDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Dixie and 12 more	64 min

Nearby

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