Alert archive / Alabama / Mesoscale Discussions in 2014

Mesoscale Discussion 15

January 11, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jan 11, 2014, 3:18 AM CST for 4 states. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued: Jan 11, 2014, 3:18 AM CST (09:18 UTC)
Expired: Jan 11, 2014, 5:15 AM CST
In force: 117 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 52 counties

Autauga County, AL, Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, Escambia County, AL, Hale County, AL, Lowndes County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Montgomery County, AL, Perry County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Ascension Parish, LA, Assumption Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jones County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 107 km from the middle of the area, began a volume at 09:17 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 00:00Z, 9.3 hours before the alert went out and 50 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: 65 J/kg
Mixed-layer CIN: -103 J/kg
Mixed-layer LCL: 502 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 270 m²/s²
0-3 km storm-relative helicity: 327 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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
Jan 10, 11:41 PM CST	Mesoscale Discussion	SPC	Choctaw, Washington	2 hr
Jan 11, 7:03 AM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Butler, Chambers, Coffee, Conecuh and 12 more	27 min
Jan 11, 7:07 AM CST	Tornado Watch	SPC	Barbour, Bullock, Chambers, Lee, Macon, Montgomery and 2 more	7 hr
Jan 11, 10:04 AM CST	Severe Thunderstorm Watch	SPC	Dale, Geneva, Henry, Houston	6 hr
Jan 11, 12:53 PM CST	Mesoscale Discussion	SPC	Henry, Houston	97 min
Jan 11, 2:35 PM CST	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 3 more	55 min

Nearby

Mesoscale Discussions in Alabama, 2014 Mesoscale Discussions in Louisiana, 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.