Alert archive / Mississippi / Mesoscale Discussions in 2013

Mesoscale Discussion 8

January 10, 20134 states

The Storm Prediction Center issued this mesoscale discussion at Jan 10, 2013, 11:35 AM CST for 4 states. It was in force for 85 min.

The area

The outline as issued.

The facts

Issued: Jan 10, 2013, 11:35 AM CST (17:35 UTC)
Expired: Jan 10, 2013, 1:00 PM CST
In force: 85 min
Issued by: the Storm Prediction Center

All 25 counties

Baldwin County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Escambia County, FL, Santa Rosa County, FL, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson 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), 57 km from the middle of the area, began a volume at 17:36 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 12:00Z, 5.6 hours before the alert went out and 110 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: 581 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 442 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 313 m²/s²
0-3 km storm-relative helicity: 334 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 4.3

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, 3:35 PM CST	Mesoscale Discussion	SPC	Baldwin, Butler, Choctaw, Clarke, Conecuh, Escambia and 4 more	85 min
Jan 9, 6:18 PM CST	Mesoscale Discussion	SPC	Assumption, Iberia, Jefferson, Lafourche, Orleans, Plaquemines and 5 more	117 min
Jan 10, 4:05 AM CST	Mesoscale Discussion	SPC	Acadia, Avoyelles, Concordia, Evangeline, Iberia, Iberville and 7 more	85 min
Jan 10, 4:31 AM CST	Tornado Watch	SPC	Acadia, Ascension, Assumption, Avoyelles, Catahoula, Concordia and 16 more	6 hr
Jan 10, 5:47 AM CST	Mesoscale Discussion	SPC	Jefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 4 more	58 min
Jan 10, 6:14 AM CST	Tornado Watch	SPC	Ascension, Assumption, Concordia, East Baton Rouge, East Feliciana, Iberville and 17 more	11 hr
Jan 10, 7:36 AM CST	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Jefferson, Lafourche and 12 more	84 min
Jan 10, 5:40 PM CST	Mesoscale Discussion	SPC	Tunica	2 hr

Nearby

Mesoscale Discussions in Mississippi, 2013 Mesoscale Discussions in Alabama, 2013 Mesoscale Discussions in Louisiana, 2013 Every mesoscale discussion in 2013

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.