Alert archive / Alabama / Mesoscale Discussions in 2017

Mesoscale Discussion 377

March 30, 2017Baldwin County, Mobile County, Alabama; Harrison County, Jackson County, Mississippi

The Storm Prediction Center issued this mesoscale discussion at Mar 30, 2017, 11:10 AM CDT for Baldwin County, Mobile County, Alabama; Harrison County, Jackson County, Mississippi. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued: Mar 30, 2017, 11:10 AM CDT (16:10 UTC)
Expired: Mar 30, 2017, 12:15 PM CDT
In force: 65 min
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Baldwin County, AL, Mobile County, AL, Harrison County, MS, Jackson County, MS

The radar

The Mobile radar (KMOB), 39 km from the middle of the area, began a volume at 16:11 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, 4.2 hours before the alert went out and 114 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1425 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 619 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.8
Supercell composite: 3.9

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.

Issued	Product	Office	Counties	Lasted
Mar 30, 1:44 PM CDT	Mesoscale Discussion	SPC	Autauga, Barbour, Bullock, Butler, Clarke, Coffee and 15 more	61 min
Mar 30, 4:33 PM CDT	Mesoscale Discussion	SPC	Geneva	87 min
Mar 29, 7:26 PM CDT	Tornado Watch	SPC	Adams, Amite, Bolivar, Carroll, Claiborne, Copiah and 19 more	8 hr
Mar 29, 9:58 PM CDT	Mesoscale Discussion	SPC	Adams, Carroll, Claiborne, Franklin, Hinds, Holmes and 10 more	92 min
Mar 30, 1:34 AM CDT	Mesoscale Discussion	SPC	Jefferson Davis, Lawrence, Lincoln, Marion, Pike, Rankin and 2 more	86 min

Nearby

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