Alert archive / Alabama / Mesoscale Discussions in 2011

Mesoscale Discussion 1259

June 17, 201116 counties in Alabama; 4 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2011, 9:49 AM CDT for 16 counties in Alabama; 4 counties in Mississippi. It was in force for 86 min.

The area

The outline as issued.

The facts

Issued: Jun 17, 2011, 9:49 AM CDT (14:49 UTC)
Expired: Jun 17, 2011, 11:15 AM CDT
In force: 86 min
Issued by: the Storm Prediction Center

Counties Autauga County, AL, Bibb County, AL, Chilton County, AL, Choctaw County, AL, Coosa County, AL, Dallas County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Perry County, AL, Pickens County, AL, Shelby County, AL, Sumter County, AL, Tuscaloosa County, AL, Wilcox County, AL, Kemper County, MS, Lauderdale County, MS, Noxubee County, MS, Winston County, MS

The radar

The Birmingham radar (KBMX), 83 km from the middle of the area, began a volume at 14:51 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.

Severe Thunderstorm Watch 490Jun 17, 11:45 AM CDT

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 2.8 hours before the alert went out and 83 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: 1495 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 688 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 33 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, 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
Jun 17, 11:42 AM CDT	Severe Thunderstorm Watch	SPC	Autauga, Barbour, Bibb, Bullock, Butler, Chambers and 26 more	6 hr
Jun 17, 2:45 PM CDT	Mesoscale Discussion	SPC	Bullock, Butler, Choctaw, Clarke, Crenshaw, Lowndes and 7 more	60 min
Jun 16, 8:22 PM CDT	Mesoscale Discussion	SPC	Alcorn, Benton, Prentiss, Tippah, Tishomingo	53 min

Nearby

Mesoscale Discussions in Alabama, 2011 Mesoscale Discussions in Mississippi, 2011 Every mesoscale discussion in 2011

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.