Alert archive / Florida / Mesoscale Discussions in 2004

Mesoscale Discussion 2215

September 15, 2004Baldwin County, Geneva County, Alabama; 15 counties in Florida; Seminole County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Sep 15, 2004, 11:17 AM CDT for Baldwin County, Geneva County, Alabama; 15 counties in Florida; Seminole County, Georgia. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Sep 15, 2004, 11:17 AM CDT (16:17 UTC)
Expired: Sep 15, 2004, 12:45 PM CDT
In force: 88 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Geneva 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, Seminole County, GA

The watches that followed

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

Tornado Watch 823Sep 15, 12:00 PM CDT

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 4.3 hours before the alert went out and 179 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: 577 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 673 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 167 m²/s²
0-3 km storm-relative helicity: 250 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
Sep 15, 12:00 PM CDT	Tornado Watch	SPC	Baldwin, Mobile	10 hr
Sep 15, 3:50 PM CDT	Tornado Watch	SPC	Baldwin, Barbour, Bullock, Butler, Choctaw, Clarke and 19 more	10 hr

Nearby

Mesoscale Discussions in Florida, 2004 Mesoscale Discussions in Alabama, 2004 Mesoscale Discussions in Georgia, 2004 Every mesoscale discussion in 2004

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.