Alert archive / Mississippi / Mesoscale Discussions in 2014

Mesoscale Discussion 1914

November 16, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Nov 16, 2014, 11:50 PM CST for 4 states. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued: Nov 16, 2014, 11:50 PM CST (05:50 UTC)
Expired: Nov 17, 2014, 12:45 AM CST
In force: 55 min
Issued by: the Storm Prediction Center

All 25 counties

Choctaw County, AL, Clarke County, AL, Escambia County, AL, Monroe County, AL, Washington County, AL, Escambia County, FL, Santa Rosa County, FL, Lafourche Parish, LA, Orleans Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Terrebonne Parish, LA, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Jones County, MS, Lamar County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 48 km from the middle of the area, began a volume at 05:51 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Tornado Watch 552Nov 17, 1:35 AM CST

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 5.8 hours before the alert went out and 106 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: 496 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 295 m²/s²
0-3 km storm-relative helicity: 414 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.3

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
Nov 16, 8:43 PM CST	Mesoscale Discussion	SPC	Washington	62 min
Nov 16, 9:49 PM CST	Tornado Watch	SPC	Mobile, Washington	7 hr
Nov 17, 1:13 AM CST	Mesoscale Discussion	SPC	Baldwin, Barbour, Butler, Coffee, Conecuh, Covington and 8 more	32 min
Nov 17, 1:32 AM CST	Tornado Watch	SPC	Baldwin, Barbour, Bullock, Butler, Clarke, Coffee and 11 more	7 hr
Nov 17, 2:21 AM CST	Mesoscale Discussion	SPC	Mobile, Washington	114 min
Nov 17, 4:39 AM CST	Mesoscale Discussion	SPC	Baldwin, Barbour, Bullock, Butler, Coffee, Conecuh and 9 more	66 min
Nov 17, 7:43 AM CST	Mesoscale Discussion	SPC	Barbour, Dale, Geneva, Henry, Houston	92 min
Nov 17, 5:11 AM CST	Tornado Watch	SPC	Columbia, Dixie, Franklin, Gadsden, Hamilton, Jefferson and 7 more	8 hr
Nov 17, 9:57 AM CST	Tornado Watch	SPC	Alachua, Baker, Bradford, Clay, Duval, Flagler and 5 more	4 hr
Nov 17, 11:14 AM CST	Mesoscale Discussion	SPC	Brevard, Citrus, Dixie, Flagler, Hernando, Hillsborough and 11 more	2 hr
Nov 17, 11:30 AM CST	Tornado Watch	SPC	Brevard, Charlotte, Citrus, DeSoto, Hardee, Hernando and 16 more	6 hr
Nov 17, 2:10 PM CST	Mesoscale Discussion	SPC	DeSoto, Hardee, Highlands, Hillsborough, Lake, Manatee and 5 more	65 min

Nearby

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