Alert archive / Georgia / Mesoscale Discussions in 2017

Mesoscale Discussion 814

May 23, 20176 counties in Alabama; 8 counties in Florida; 33 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at May 23, 2017, 8:38 AM CDT for 6 counties in Alabama; 8 counties in Florida; 33 counties in Georgia. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: May 23, 2017, 8:38 AM CDT (13:38 UTC)
Expired: May 23, 2017, 10:45 AM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 60%

All 47 counties

Coffee County, AL, Covington County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Calhoun County, FL, Gadsden County, FL, Holmes County, FL, Jackson County, FL, Leon County, FL, Okaloosa County, FL, Walton County, FL, Washington County, FL, Atkinson County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Pulaski County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA, Sumter County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Webster County, GA, Wilcox County, GA, Worth County, GA

The radar

The Ft Rucker radar (KEOX), 72 km from the middle of the area, began a volume at 13:39 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 257May 23, 9:10 AM CDT

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 1.6 hours before the alert went out and 90 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: 205 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 885 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 91 m²/s²
0-3 km storm-relative helicity: 185 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.3

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 23, 9:10 AM CDT	Tornado Watch	SPC	Barbour, Bullock, Coffee, Dale, Geneva, Henry and 3 more	8 hr
May 23, 11:22 AM CDT	Mesoscale Discussion	SPC	Houston	83 min
May 23, 1:45 PM CDT	Tornado Watch	SPC	Hamilton	8 hr
May 23, 3:50 PM CDT	Mesoscale Discussion	SPC	Baker, Hamilton, Jefferson, Leon, Liberty, Madison and 2 more	85 min
May 23, 1:02 PM CDT	Mesoscale Discussion	SPC	Appling, Atkinson, Bacon, Ben Hill, Berrien, Bleckley and 45 more	118 min

Nearby

Mesoscale Discussions in Georgia, 2017 Mesoscale Discussions in Florida, 2017 Mesoscale Discussions in Alabama, 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.