Alert archive / Florida / Mesoscale Discussions in 2007

Mesoscale Discussion 2109

October 18, 2007Baldwin County, Alabama; 7 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Oct 18, 2007, 11:15 AM CDT for Baldwin County, Alabama; 7 counties in Florida. It was in force for 90 min.

The area

The outline as issued.

The facts

Issued: Oct 18, 2007, 11:15 AM CDT (16:15 UTC)
Expired: Oct 18, 2007, 12:45 PM CDT
In force: 90 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Bay County, FL, Escambia County, FL, Gulf County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 130 km from the middle of the area, began a volume at 16:15 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.3 hours before the alert went out and 250 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: 2019 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 606 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 7.6

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
Oct 18, 3:02 AM CDT	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Conecuh, Escambia, Marengo and 4 more	58 min
Oct 18, 10:26 AM CDT	Mesoscale Discussion	SPC	Colbert, Franklin, Lamar, Lauderdale, Lawrence, Limestone and 2 more	2 hr
Oct 18, 1:31 PM CDT	Tornado Watch	SPC	Colbert, Cullman, Fayette, Franklin, Greene, Hale and 13 more	9 hr
Oct 18, 3:52 PM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 36 more	83 min
Oct 18, 5:39 PM CDT	Mesoscale Discussion	SPC	Colbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 4 more	66 min

Nearby

Mesoscale Discussions in Florida, 2007 Mesoscale Discussions in Alabama, 2007 Every mesoscale discussion in 2007

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.