Alert archive / Alabama / Mesoscale Discussions in 2019

Mesoscale Discussion 532

May 4, 201915 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida

The Storm Prediction Center issued this mesoscale discussion at May 4, 2019, 2:09 PM CDT for 15 counties in Alabama; Escambia County, Okaloosa County, Santa Rosa County, Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 4, 2019, 2:09 PM CDT (19:09 UTC)
Expired: May 4, 2019, 4:15 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center

Counties Autauga County, AL, Baldwin County, AL, Butler County, AL, Choctaw County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dallas County, AL, Escambia County, AL, Lowndes County, AL, Marengo County, AL, Monroe County, AL, Washington County, AL, Wilcox County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL

The radar

The Mobile radar (KMOB), 98 km from the middle of the area, began a volume at 19:13 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, 7.2 hours before the alert went out and 244 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: 1718 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 669 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 140 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 8.6

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
May 4, 11:58 AM CDT	Mesoscale Discussion	SPC	Autauga, Baldwin, Barbour, Bibb, Bullock, Butler and 31 more	77 min
May 4, 12:14 PM CDT	Severe Thunderstorm Watch	SPC	Autauga, Baldwin, Barbour, Bullock, Butler, Chambers and 20 more	7 hr
May 4, 3:28 PM CDT	Mesoscale Discussion	SPC	Autauga, Barbour, Bullock, Butler, Chambers, Coffee and 20 more	92 min
May 4, 1:05 PM CDT	Mesoscale Discussion	SPC	Brevard, Glades, Hardee, Highlands, Indian River, Lake and 8 more	2 hr

Nearby

Mesoscale Discussions in Alabama, 2019 Mesoscale Discussions in Florida, 2019 Every mesoscale discussion in 2019

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.