Alert archive / Alabama / Mesoscale Discussions in 2014

Mesoscale Discussion 887

June 7, 201413 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Jun 7, 2014, 8:28 PM CDT for 13 counties in Alabama. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 7, 2014, 8:28 PM CDT (01:28 UTC)
Expired: Jun 7, 2014, 10:30 PM CDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 20%

Counties Blount County, AL, Calhoun County, AL, Cherokee County, AL, Cleburne County, AL, Cullman County, AL, Etowah County, AL, Fayette County, AL, Jefferson County, AL, Lamar County, AL, Marion County, AL, St. Clair County, AL, Walker County, AL, Winston County, AL

The radar

The Birmingham radar (KBMX), 84 km from the middle of the area, began a volume at 01:32 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 00:00Z, 1.5 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: 2154 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1151 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.4

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 8, 11:24 AM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Chilton, Dallas, Greene, Hale and 4 more	66 min
Jun 8, 12:49 PM CDT	Severe Thunderstorm Watch	SPC	Autauga, Barbour, Bibb, Bullock, Chilton, Clay and 21 more	8 hr
Jun 8, 1:11 PM CDT	Mesoscale Discussion	SPC	Butler, Clarke, Coffee, Conecuh, Covington, Crenshaw and 6 more	3 hr
Jun 8, 1:49 PM CDT	Severe Thunderstorm Watch	SPC	Butler, Choctaw, Clarke, Coffee, Conecuh, Covington and 8 more	7 hr
Jun 8, 3:08 PM CDT	Mesoscale Discussion	SPC	Autauga, Bibb, Chilton, Choctaw, Clay, Coosa and 16 more	97 min
Jun 8, 3:23 PM CDT	Mesoscale Discussion	SPC	Barbour, Butler, Clarke, Coffee, Conecuh, Covington and 8 more	97 min

Nearby

Mesoscale Discussions in Alabama, 2014 Every mesoscale discussion in 2014

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.