Alert archive / Georgia / Mesoscale Discussions in 2020

Mesoscale Discussion 416

April 19, 20204 counties in Alabama; 5 counties in Florida; 15 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Apr 19, 2020, 9:53 PM CDT for 4 counties in Alabama; 5 counties in Florida; 15 counties in Georgia. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Apr 19, 2020, 9:53 PM CDT (02:53 UTC)
Expired: Apr 19, 2020, 11:00 PM CDT
In force: 67 min
Issued by: the Storm Prediction Center
Chance of a watch: 80%

All 24 counties

Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Gadsden County, FL, Holmes County, FL, Jackson County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Calhoun County, GA, Clay County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Miller County, GA, Mitchell County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Worth County, GA

The radar

The Ft Rucker radar (KEOX), 42 km from the middle of the area, began a volume at 02:53 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.

Tornado Watch 125Apr 19, 10:10 PM CDT

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 2.9 hours before the alert went out and 120 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: 2182 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 709 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 259 m²/s²
0-3 km storm-relative helicity: 327 m²/s²
Significant tornado parameter: 3.5
Supercell composite: 17.9

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
Apr 19, 8:25 PM CDT	Mesoscale Discussion	SPC	Barbour, Bullock, Crenshaw, Dale, Henry, Macon and 3 more	65 min
Apr 19, 9:07 PM CDT	Mesoscale Discussion	SPC	Mobile	83 min
Apr 19, 9:39 PM CDT	Tornado Watch	SPC	Baldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 5 more	5 hr
Apr 19, 10:13 PM CDT	Tornado Watch	SPC	Barbour, Coffee, Dale, Geneva, Henry, Houston and 1 more	10 hr
Apr 20, 12:52 AM CDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 6 more	83 min
Apr 20, 1:19 AM CDT	Tornado Watch	SPC	Alachua, Baker, Bradford, Clay, Columbia, Duval and 9 more	9 hr
Apr 20, 5:19 AM CDT	Mesoscale Discussion	SPC	Alachua, Baker, Bradford, Citrus, Clay, Columbia and 16 more	86 min
Apr 20, 6:02 AM CDT	Severe Thunderstorm Watch	SPC	Brevard, Citrus, Hardee, Hernando, Hillsborough, Lake and 11 more	8 hr
Apr 20, 7:18 AM CDT	Mesoscale Discussion	SPC	Alachua, Citrus, Flagler, Levy, Marion, Putnam and 2 more	87 min
Apr 20, 10:06 AM CDT	Mesoscale Discussion	SPC	Brevard, Hardee, Hernando, Hillsborough, Indian River, Lake and 10 more	114 min
Apr 20, 1:00 PM CDT	Mesoscale Discussion	SPC	DeSoto, Hardee, Highlands, Indian River, Manatee, Okeechobee and 4 more	90 min

Nearby

Mesoscale Discussions in Georgia, 2020 Mesoscale Discussions in Florida, 2020 Mesoscale Discussions in Alabama, 2020 Every 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.