Alert archive / Alabama / Mesoscale Discussions in 2015

Mesoscale Discussion 1918

November 2, 20156 counties in Alabama; 4 counties in Florida; Clay County, Early County, Quitman County, Georgia

The Storm Prediction Center issued this mesoscale discussion at Nov 2, 2015, 5:46 AM CST for 6 counties in Alabama; 4 counties in Florida; Clay County, Early County, Quitman County, Georgia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Nov 2, 2015, 5:46 AM CST (11:46 UTC)
Expired: Nov 2, 2015, 8:15 AM CST
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 40%

Counties Barbour County, AL, Coffee County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Holmes County, FL, Jackson County, FL, Walton County, FL, Washington County, FL, Clay County, GA, Early County, GA, Quitman County, GA

The radar

The Ft Rucker radar (KEOX), 19 km from the middle of the area, began a volume at 11:47 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, 11.8 hours before the alert went out and 151 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: 752 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 639 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.5

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 2, 1:28 AM CST	Mesoscale Discussion	SPC	Covington, Geneva, Houston	2 hr
Nov 2, 10:21 AM CST	Mesoscale Discussion	SPC	Jackson, Washington	54 min
Nov 2, 12:15 PM CST	Tornado Watch	SPC	Atkinson, Baker, Ben Hill, Berrien, Bibb, Bleckley and 40 more	6 hr
Nov 2, 1:36 PM CST	Mesoscale Discussion	SPC	Baker, Ben Hill, Berrien, Bibb, Bleckley, Coffee and 33 more	84 min
Nov 2, 3:37 PM CST	Mesoscale Discussion	SPC	Bryan, Bulloch, Candler, Chatham, Effingham, Evans and 2 more	53 min
Nov 2, 5:05 PM CST	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Berrien, Bryan, Bulloch and 12 more	115 min

Nearby

Mesoscale Discussions in Alabama, 2015 Mesoscale Discussions in Florida, 2015 Mesoscale Discussions in Georgia, 2015 Every mesoscale discussion in 2015

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.