Alert archive / Florida / Mesoscale Discussions in 2014

Mesoscale Discussion 1940

November 23, 2014Baldwin County, Mobile County, Alabama; 7 counties in Florida; Jackson County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 23, 2014, 8:01 AM CST for Baldwin County, Mobile County, Alabama; 7 counties in Florida; Jackson County, Mississippi. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Nov 23, 2014, 8:01 AM CST (14:01 UTC)
Expired: Nov 23, 2014, 9:00 AM CST
In force: 59 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

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

The radar

The Eglin Afb radar (KEVX), 102 km from the middle of the area, began a volume at 14:04 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, 2.0 hours before the alert went out and 255 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: 350 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 553 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 374 m²/s²
0-3 km storm-relative helicity: 452 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.8

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 23, 11:20 AM CST	Mesoscale Discussion	SPC	Coffee, Dale, Geneva, Houston	55 min
Nov 23, 12:35 PM CST	Tornado Watch	SPC	Barbour, Bullock, Coffee, Dale, Geneva, Henry and 6 more	6 hr
Nov 23, 2:20 PM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Coffee, Dale, Geneva, Henry and 4 more	55 min
Nov 23, 2:36 PM CST	Mesoscale Discussion	SPC	Nassau	2 hr

Nearby

Mesoscale Discussions in Florida, 2014 Mesoscale Discussions in Alabama, 2014 Mesoscale Discussions in Mississippi, 2014 Every mesoscale discussion in 2014

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.