Alert archive / Louisiana / Mesoscale Discussions in 2014

Mesoscale Discussion 1916

November 17, 2014Mobile County, Washington County, Alabama; Jefferson Parish, Plaquemines Parish, Saint Bernard Parish, Louisiana; George County, Harrison County, Jackson County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Nov 17, 2014, 2:21 AM CST for Mobile County, Washington County, Alabama; Jefferson Parish, Plaquemines Parish, Saint Bernard Parish, Louisiana; George County, Harrison County, Jackson County, Mississippi. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued
Nov 17, 2014, 2:21 AM CST (08:21 UTC)
Expired
Nov 17, 2014, 4:15 AM CST
In force
114 min
Issued by
the Storm Prediction Center

Counties Mobile County, AL, Washington County, AL, Jefferson Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, George County, MS, Harrison County, MS, Jackson County, MS

The radar

The Mobile radar (KMOB), 114 km from the middle of the area, began a volume at 08:22 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 00:00Z, 8.4 hours before the alert went out and 74 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 00:00Z on 2014-11-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 496 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 00:00Z on 2014-11-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 295 square meters per square second.1939587897Sfc1 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
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.

IssuedProductOfficeCountiesLasted
Nov 16, 8:43 PM CSTMesoscale DiscussionSPCWashington62 min
Nov 16, 9:49 PM CSTTornado WatchSPCMobile, Washington7 hr
Nov 16, 11:50 PM CSTMesoscale DiscussionSPCChoctaw, Clarke, Escambia, Monroe, Washington55 min
Nov 17, 1:13 AM CSTMesoscale DiscussionSPCBaldwin, Barbour, Butler, Coffee, Conecuh, Covington and 8 more32 min
Nov 17, 1:32 AM CSTTornado WatchSPCBaldwin, Barbour, Bullock, Butler, Clarke, Coffee and 11 more7 hr
Nov 17, 4:39 AM CSTMesoscale DiscussionSPCBaldwin, Barbour, Bullock, Butler, Coffee, Conecuh and 9 more66 min
Nov 17, 7:43 AM CSTMesoscale DiscussionSPCBarbour, Dale, Geneva, Henry, Houston92 min

Nearby

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