Alert archive / Mississippi / Mesoscale Discussions in 2015

Mesoscale Discussion 1241

June 30, 20154 states

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2015, 11:38 AM CDT for 4 states. It was in force for 97 min.

The area

The outline as issued.

The facts

Issued: Jun 30, 2015, 11:38 AM CDT (16:38 UTC)
Expired: Jun 30, 2015, 1:15 PM CDT
In force: 97 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 42 counties

Baldwin County, AL, Butler County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, East Feliciana Parish, LA, Saint Helena Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Amite County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 58 km from the middle of the area, began a volume at 16:38 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.

Severe Thunderstorm Watch 376Jun 30, 1:05 PM CDT

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 4.6 hours before the alert went out and 195 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: 952 J/kg
Mixed-layer CIN: -119 J/kg
Mixed-layer LCL: 929 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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
Jun 30, 7:59 AM CDT	Mesoscale Discussion	SPC	Bullock, Chambers, Clay, Cleburne, Elmore, Lee and 4 more	2 hr
Jun 30, 11:17 AM CDT	Mesoscale Discussion	SPC	Geneva, Henry, Houston	88 min
Jun 30, 1:06 PM CDT	Severe Thunderstorm Watch	SPC	Baldwin, Coffee, Covington, Crenshaw, Dale, Escambia and 4 more	6 hr
Jun 30, 12:57 PM CDT	Severe Thunderstorm Watch	SPC	Alachua, Baker, Bradford, Columbia, Gilchrist, Hamilton and 2 more	7 hr
Jun 30, 3:51 PM CDT	Mesoscale Discussion	SPC	Alachua, Bradford, Calhoun, Clay, Columbia, Gadsden and 11 more	114 min
Jun 30, 1:09 PM CDT	Mesoscale Discussion	SPC	Bienville, Bossier, Caldwell, Catahoula, Claiborne, Concordia and 18 more	3 hr

Nearby

Mesoscale Discussions in Mississippi, 2015 Mesoscale Discussions in Alabama, 2015 Mesoscale Discussions in Louisiana, 2015 Every mesoscale discussion in 2015

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.