Alert archive / Louisiana / Mesoscale Discussions in 2017

Mesoscale Discussion 925

May 31, 2017Plaquemines Parish, Saint Bernard Parish, Louisiana; Harrison County, Jackson County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 31, 2017, 11:00 AM CDT for Plaquemines Parish, Saint Bernard Parish, Louisiana; Harrison County, Jackson County, Mississippi. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
May 31, 2017, 11:00 AM CDT (16:00 UTC)
Expired
May 31, 2017, 1:30 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
5%

Counties Plaquemines Parish, LA, Saint Bernard Parish, LA, Harrison County, MS, Jackson County, MS

The radar

The Mobile radar (KMOB), 115 km from the middle of the area, began a volume at 16:01 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 12:00Z, 4.0 hours before the alert went out and 108 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 2017-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 710 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 2017-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 140 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
710 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
596 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
140 m²/s²
0-3 km storm-relative helicity
199 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

The text

As transmitted.

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Nearby

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