Alert archive / Alabama / Mesoscale Discussions in 2014

Mesoscale Discussion 1887

October 13, 201411 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida

The Storm Prediction Center issued this mesoscale discussion at Oct 13, 2014, 11:52 PM CDT for 11 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued: Oct 13, 2014, 11:52 PM CDT (04:52 UTC)
Expired: Oct 14, 2014, 12:45 AM CDT
In force: 53 min
Issued by: the Storm Prediction Center

Counties Autauga County, AL, Butler County, AL, Coffee County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Elmore County, AL, Lowndes County, AL, Montgomery County, AL, Pike County, AL, Tallapoosa County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL

The radar

The Ft Rucker radar (KEOX), 116 km from the middle of the area, began a volume at 04:54 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

Birmingham, AL (KBMX), launched 00:00Z, 4.9 hours before the alert went out and 193 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: 880 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 710 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 338 m²/s²
0-3 km storm-relative helicity: 406 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 13.0

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
Oct 13, 7:23 PM CDT	Tornado Watch	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more	7 hr
Oct 13, 7:33 PM CDT	Mesoscale Discussion	SPC	Blount, Cullman, Fayette, Jackson, Jefferson, Lauderdale and 9 more	57 min
Oct 13, 8:57 PM CDT	Mesoscale Discussion	SPC	Barbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 11 more	2 hr
Oct 13, 10:44 PM CDT	Tornado Watch	SPC	Barbour, Bullock, Chambers, Coffee, Coosa, Dale and 10 more	6 hr
Oct 14, 2:07 AM CDT	Mesoscale Discussion	SPC	Barbour, Chambers, Dale, Henry, Houston, Lee and 2 more	83 min
Oct 14, 3:27 AM CDT	Tornado Watch	SPC	Houston	8 hr
Oct 14, 6:23 AM CDT	Mesoscale Discussion	SPC	Jackson	2 hr
Oct 14, 7:35 AM CDT	Mesoscale Discussion	SPC	Calhoun, Franklin, Gadsden, Gulf, Jackson, Jefferson and 5 more	85 min
Oct 14, 10:21 AM CDT	Mesoscale Discussion	SPC	Baker, Columbia, Dixie, Gilchrist, Hamilton, Jefferson and 8 more	114 min
Oct 14, 10:43 AM CDT	Severe Thunderstorm Watch	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 16 more	7 hr

Nearby

Mesoscale Discussions in Alabama, 2014 Mesoscale Discussions in Florida, 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.