Alert archive / Mississippi / Mesoscale Discussions in 2017

Mesoscale Discussion 12

January 2, 20174 states

The Storm Prediction Center issued this mesoscale discussion at Jan 2, 2017, 2:03 PM CST for 4 states. It was in force for 117 min.

The area

The outline as issued.

The facts

Issued
Jan 2, 2017, 2:03 PM CST (20:03 UTC)
Expired
Jan 2, 2017, 4:00 PM CST
In force
117 min
Issued by
the Storm Prediction Center
All 62 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, Marengo County, AL, Mobile County, AL, Monroe County, AL, Sumter 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, Lafourche 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, Tangipahoa Parish, LA, Terrebonne 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, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Madison County, MS, Marion County, MS, Neshoba County, MS, Newton County, MS, Pearl River County, MS, Perry County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 85 km from the middle of the area, began a volume at 20:02 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.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.1 hours before the alert went out and 80 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-pSkew-T log-p diagram, Slidell Radar S, LA at 12:00Z on 2017-01-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1261 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2017-01-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 322 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1261 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
571 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
322 m²/s²
0-3 km storm-relative helicity
423 m²/s²
Significant tornado parameter
0.6
Supercell composite
4.0

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.

IssuedProductOfficeCountiesLasted
Jan 2, 7:08 AM CSTMesoscale DiscussionSPCBibb, Choctaw, Greene, Hale, Marengo, Perry and 3 more97 min
Jan 2, 10:17 AM CSTMesoscale DiscussionSPCBaldwin, Clarke, Mobile, Washington118 min
Jan 2, 11:22 AM CSTTornado WatchSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 8 more9 hr
Jan 2, 12:59 PM CSTMesoscale DiscussionSPCAutauga, Barbour, Bullock, Butler, Chambers, Chilton and 17 more2 hr
Jan 2, 3:46 PM CSTTornado WatchSPCBarbour, Bullock, Coffee, Dale, Geneva, Henry and 3 more8 hr
Jan 2, 5:36 PM CSTMesoscale DiscussionSPCBarbour, Bullock, Butler, Coffee, Covington, Crenshaw and 10 more114 min
Jan 2, 2:06 AM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Calcasieu and 23 more114 min
Jan 2, 5:35 AM CSTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Bienville, Bossier, Caddo and 18 more85 min
Jan 2, 6:12 AM CSTTornado WatchSPCAcadia, Allen, Avoyelles, Beauregard, Bienville, Bossier and 27 more10 hr
Jan 2, 7:48 AM CSTMesoscale DiscussionSPCAcadia, Allen, Beauregard, Bienville, Bossier, Caddo and 19 more57 min
Jan 2, 11:09 AM CSTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Caldwell, Cameron, Evangeline and 12 more96 min

Nearby

Mesoscale Discussions in Mississippi, 2017Mesoscale Discussions in Alabama, 2017Mesoscale Discussions in Louisiana, 2017Every 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.