Alert archive / Mississippi / Mesoscale Discussions in 2020

Mesoscale Discussion 867

June 7, 2020Baldwin County, Mobile County, Alabama; Saint Bernard Parish, Louisiana; 5 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 7, 2020, 8:58 AM CDT for Baldwin County, Mobile County, Alabama; Saint Bernard Parish, Louisiana; 5 counties in Mississippi. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Jun 7, 2020, 8:58 AM CDT (13:58 UTC)
Expired
Jun 7, 2020, 10:00 AM CDT
In force
62 min
Issued by
the Storm Prediction Center
Concerning
Severe potential...tornado watch likely
Chance of a watch
95%

Counties Baldwin County, AL, Mobile County, AL, Saint Bernard Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 80 km from the middle of the area, began a volume at 14:01 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 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, 2.0 hours before the alert went out and 96 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 2020-06-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLEL10008507005003002001001 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 2020-06-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 276 square meters per square second.193958Sfc1 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
2 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
479 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
276 m²/s²
0-3 km storm-relative helicity
265 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
Jun 7, 6:12 AM CDTMesoscale DiscussionSPCBaldwin2 hr
Jun 7, 9:03 AM CDTTornado WatchSPCBaldwin, Mobile8 hr

Nearby

Mesoscale Discussions in Mississippi, 2020Mesoscale Discussions in Alabama, 2020Mesoscale Discussions in Louisiana, 2020Every mesoscale discussion in 2020

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.