Alert archive / Florida / Mesoscale Discussions in 2019

Mesoscale Discussion 285

April 8, 2019Geneva County, Alabama; 4 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Apr 8, 2019, 5:11 AM CDT for Geneva County, Alabama; 4 counties in Florida. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Apr 8, 2019, 5:11 AM CDT (10:11 UTC)
Expired: Apr 8, 2019, 6:45 AM CDT
In force: 94 min
Issued by: the Storm Prediction Center
Chance of a watch: 5%

Counties Geneva County, AL, Holmes County, FL, Okaloosa County, FL, Walton County, FL, Washington County, FL

The radar

The Eglin Afb radar (KEVX), 20 km from the middle of the area, began a volume at 10:12 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 10.2 hours before the alert went out and 168 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: 56 J/kg
Mixed-layer CIN: -178 J/kg
Mixed-layer LCL: 1398 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 29 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.

Issued	Product	Office	Counties	Lasted
Apr 7, 9:39 PM CDT	Mesoscale Discussion	SPC	Baldwin, Choctaw, Clarke, Mobile, Washington	2 hr
Apr 8, 5:21 AM CDT	Mesoscale Discussion	SPC	Blount, Etowah, Marshall	54 min
Apr 8, 4:05 PM CDT	Mesoscale Discussion	SPC	Fayette, Greene, Lamar, Pickens, Sumter	2 hr
Apr 8, 8:46 AM CDT	Mesoscale Discussion	SPC	Bay, Calhoun, Gulf, Okaloosa, Santa Rosa, Walton and 1 more	119 min

Nearby

Mesoscale Discussions in Florida, 2019 Mesoscale Discussions in Alabama, 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.