Alert archive / Florida / Mesoscale Discussions in 2007

Mesoscale Discussion 2159

November 21, 20077 counties in Alabama; 10 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Nov 21, 2007, 10:49 PM CST for 7 counties in Alabama; 10 counties in Florida. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Nov 21, 2007, 10:49 PM CST (04:49 UTC)
Expired: Nov 22, 2007, 12:15 AM CST
In force: 86 min
Issued by: the Storm Prediction Center

Counties Baldwin County, AL, Coffee County, AL, Covington County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 61 km from the middle of the area, began a volume at 04:52 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, 4.8 hours before the alert went out and 210 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: 962 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 170 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
Nov 22, 1:54 AM CST	Mesoscale Discussion	SPC	Bay, Franklin, Gulf	2 hr

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.