Alert archive / Mississippi / Mesoscale Discussions in 2017

Mesoscale Discussion 1118

June 22, 20174 states

The Storm Prediction Center issued this mesoscale discussion at Jun 22, 2017, 2:24 AM CDT for 4 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Jun 22, 2017, 2:24 AM CDT (07:24 UTC)
Expired: Jun 22, 2017, 4:00 AM CDT
In force: 96 min
Issued by: the Storm Prediction Center

All 49 counties

Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Geneva County, AL, Lowndes County, AL, Marengo County, AL, Mobile County, AL, Monroe County, AL, Pike County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Holmes County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Jefferson Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jasper County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 27 km from the middle of the area, began a volume at 07:24 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 363Jun 22, 2:55 AM CDT

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 7.4 hours before the alert went out and 121 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: 771 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 593 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 126 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 21, 9:56 PM CDT	Mesoscale Discussion	SPC	Baldwin, Clarke, Coffee, Conecuh, Covington, Escambia and 4 more	2 hr
Jun 22, 2:57 AM CDT	Tornado Watch	SPC	Autauga, Baldwin, Butler, Choctaw, Clarke, Conecuh and 15 more	10 hr
Jun 22, 11:50 AM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Bibb, Butler, Chilton, Choctaw and 22 more	85 min
Jun 22, 1:04 PM CDT	Tornado Watch	SPC	Autauga, Barbour, Bibb, Blount, Bullock, Butler and 40 more	9 hr
Jun 22, 3:48 PM CDT	Mesoscale Discussion	SPC	Autauga, Barbour, Bibb, Blount, Bullock, Butler and 48 more	87 min
Jun 22, 6:59 PM CDT	Mesoscale Discussion	SPC	Benton, Bolivar, Calhoun, Coahoma, DeSoto, Grenada and 11 more	61 min

Nearby

Mesoscale Discussions in Mississippi, 2017 Mesoscale Discussions in Alabama, 2017 Mesoscale Discussions in Louisiana, 2017 Every mesoscale discussion in 2017

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.