Alert archive / Alabama / Mesoscale Discussions in 2014

Mesoscale Discussion 933

June 9, 201425 counties in Alabama

The Storm Prediction Center issued this mesoscale discussion at Jun 9, 2014, 8:13 PM CDT for 25 counties in Alabama. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Jun 9, 2014, 8:13 PM CDT (01:13 UTC)
Expired
Jun 9, 2014, 9:45 PM CDT
In force
92 min
Issued by
the Storm Prediction Center
All 25 counties

Autauga County, AL, Bibb County, AL, Blount County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Etowah County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Perry County, AL, Pickens County, AL, Randolph County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Tallapoosa County, AL, Tuscaloosa County, AL, Walker County, AL

The radar

The Birmingham radar (KBMX), 11 km from the middle of the area, began a volume at 01:15 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.

The nearest sounding before it

Birmingham, AL (KBMX), launched 00:00Z, 1.2 hours before the alert went out and 10 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-pSkew-T log-p diagram, Birmingham, AL at 00:00Z on 2014-06-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 742 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 00:00Z on 2014-06-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
742 J/kg
Mixed-layer CIN
-26 J/kg
Mixed-layer LCL
1374 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
137 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.7

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.

IssuedProductOfficeCountiesLasted
Jun 9, 8:57 PM CDTSevere Thunderstorm WatchSPCDeKalb, Jackson, Madison, Marshall7 hr
Jun 9, 10:17 PM CDTMesoscale DiscussionSPCAutauga, Blount, Calhoun, Cherokee, Chilton, Clay and 15 more88 min
Jun 10, 10:10 AM CDTMesoscale DiscussionSPCChoctaw, Clarke, Dallas, Greene, Hale, Marengo and 6 more65 min
Jun 10, 10:34 AM CDTMesoscale DiscussionSPCBibb, Blount, Cullman, DeKalb, Etowah, Hale and 12 more116 min
Jun 10, 10:51 AM CDTSevere Thunderstorm WatchSPCAutauga, Bibb, Blount, Bullock, Calhoun, Chambers and 35 more7 hr
Jun 10, 10:58 AM CDTSevere Thunderstorm WatchSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more8 hr
Jun 10, 1:26 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Conecuh, Covington, Crenshaw, Escambia and 2 more94 min
Jun 10, 1:57 PM CDTMesoscale DiscussionSPCCalhoun, Chambers, Cherokee, Clay, Cleburne, Coosa and 11 more93 min
Jun 10, 3:03 PM CDTMesoscale DiscussionSPCBaldwin, Butler, Coffee, Conecuh, Covington, Dale and 3 more87 min
Jun 10, 3:57 PM CDTMesoscale DiscussionSPCChambers, Randolph63 min

Nearby

Mesoscale Discussions in Alabama, 2014Every 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.