Alert archive / Louisiana / Mesoscale Discussions in 2018

Mesoscale Discussion 1622

November 5, 201810 parishes in Louisiana

The Storm Prediction Center issued this mesoscale discussion at Nov 5, 2018, 5:05 PM CST for 10 parishes in Louisiana. It was in force for 55 min.

The area

The outline as issued.

The facts

Issued
Nov 5, 2018, 5:05 PM CST (23:05 UTC)
Expired
Nov 5, 2018, 6:00 PM CST
In force
55 min
Issued by
the Storm Prediction Center

Counties Bienville Parish, LA, Caldwell Parish, LA, Franklin Parish, LA, Jackson Parish, LA, Madison Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Winn Parish, LA

The radar

The Ft Polk radar (KPOE), 131 km from the middle of the area, began a volume at 23:07 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

Shreveport, LA (KBAD), launched 12:00Z, 11.1 hours before the alert went out and 127 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, Shreveport, LA at 12:00Z on 2018-11-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Shreveport, LA at 12:00Z on 2018-11-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 271 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1239 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
271 m²/s²
0-3 km storm-relative helicity
335 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Nov 5, 3:38 PM CSTMesoscale DiscussionSPCBienville, Claiborne, De Soto, East Carroll, Jackson, Lincoln and 6 more2 hr
Nov 5, 4:06 PM CSTTornado WatchSPCBienville, Bossier, Caddo, Caldwell, Catahoula, Claiborne and 19 more7 hr

Nearby

Mesoscale Discussions in Louisiana, 2018Every mesoscale discussion in 2018

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.