Alert archive / Alabama / Mesoscale Discussions in 2013

Mesoscale Discussion 667

May 17, 201335 counties in Alabama; 24 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at May 17, 2013, 1:39 PM CDT for 35 counties in Alabama; 24 counties in Mississippi. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: May 17, 2013, 1:39 PM CDT (18:39 UTC)
Expired: May 17, 2013, 3:15 PM CDT
In force: 96 min
Issued by: the Storm Prediction Center
Chance of a watch: 40%

All 59 counties

Autauga County, AL, Bibb County, AL, Blount County, AL, Calhoun County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Clay County, AL, Coosa County, AL, Cullman County, AL, Dallas County, AL, Elmore County, AL, Etowah County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Lowndes County, AL, Marengo County, AL, Marion County, AL, Marshall County, AL, Montgomery County, AL, Morgan County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL, Wilcox County, AL, Winston County, AL, Attala County, MS, Carroll County, MS, Choctaw County, MS, Clarke County, MS, Clay County, MS, Holmes County, MS, Jasper County, MS, Jones County, MS, Kemper County, MS, Lauderdale County, MS, Leake County, MS, Lowndes County, MS, Madison County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Simpson County, MS, Smith County, MS, Wayne County, MS, Winston County, MS

The radar

The Birmingham radar (KBMX), 93 km from the middle of the area, began a volume at 18:41 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

Birmingham, AL (KBMX), launched 12:00Z, 6.7 hours before the alert went out and 92 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: 218 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 645 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 34 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 5:45 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Chilton, Dallas, Greene, Hale and 7 more	60 min
May 17, 6:19 PM CDT	Severe Thunderstorm Watch	SPC	Autauga, Bibb, Chilton, Coosa, Dallas, Elmore and 10 more	5 hr
May 16, 7:24 PM CDT	Mesoscale Discussion	SPC	Issaquena, Sharkey, Washington	96 min
May 16, 7:59 PM CDT	Tornado Watch	SPC	Humphreys, Issaquena, Sharkey, Warren, Washington	4 hr
May 16, 10:59 PM CDT	Mesoscale Discussion	SPC	Issaquena, Sharkey, Washington	61 min
May 17, 4:00 PM CDT	Mesoscale Discussion	SPC	Claiborne, Hinds, Issaquena, Jefferson, Sharkey, Warren	60 min

Nearby

Mesoscale Discussions in Alabama, 2013 Mesoscale Discussions in Mississippi, 2013 Every mesoscale discussion in 2013

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.