Alert archive / Georgia / Mesoscale Discussions in 2017

Mesoscale Discussion 815

May 23, 2017Houston County, Alabama; 7 counties in Florida; 42 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at May 23, 2017, 11:22 AM CDT for Houston County, Alabama; 7 counties in Florida; 42 counties in Georgia. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued: May 23, 2017, 11:22 AM CDT (16:22 UTC)
Expired: May 23, 2017, 12:45 PM CDT
In force: 83 min
Issued by: the Storm Prediction Center

All 50 counties

Houston County, AL, Calhoun County, FL, Gadsden County, FL, Jackson County, FL, Jefferson County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Atkinson County, GA, Bacon County, GA, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dodge County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Echols County, GA, Grady County, GA, Irwin County, GA, Jeff Davis County, GA, Lanier County, GA, Laurens County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Montgomery County, GA, Pulaski County, GA, Randolph County, GA, Seminole County, GA, Sumter County, GA, Telfair County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Toombs County, GA, Treutlen County, GA, Turner County, GA, Wheeler County, GA, Wilcox County, GA, Worth County, GA

The radar

The Moody AFB radar (KVAX), 96 km from the middle of the area, began a volume at 16:26 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 258May 23, 1:40 PM CDT

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 4.4 hours before the alert went out and 117 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, 8:38 AM CDT	Mesoscale Discussion	SPC	Coffee, Covington, Dale, Geneva, Henry, Houston	2 hr
May 23, 9:10 AM CDT	Tornado Watch	SPC	Barbour, Bullock, Coffee, Dale, Geneva, Henry and 3 more	8 hr
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.