Alert archive / Florida / Mesoscale Discussions in 2014

Mesoscale Discussion 899

June 8, 201412 counties in Alabama; 20 counties in Florida; 17 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Jun 8, 2014, 1:11 PM CDT for 12 counties in Alabama; 20 counties in Florida; 17 counties in Georgia. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Jun 8, 2014, 1:11 PM CDT (18:11 UTC)
Expired
Jun 8, 2014, 3:45 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
60%
All 49 counties

Butler County, AL, Clarke County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Monroe County, AL, Bay County, FL, Calhoun County, FL, Dixie County, FL, Escambia County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Okaloosa County, FL, Santa Rosa County, FL, Taylor County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Grady County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Seminole County, GA, Thomas County, GA, Tift County, GA, Worth County, GA

The radar

The Eglin Afb radar (KEVX), 48 km from the middle of the area, began a volume at 18:10 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 6.2 hours before the alert went out and 124 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, Tallahassee Rgnl, FL at 12:00Z on 2014-06-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 659 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, Tallahassee Rgnl, FL at 12:00Z on 2014-06-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 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
659 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
924 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
20 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.8

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 7, 8:28 PM CDTMesoscale DiscussionSPCBlount, Calhoun, Cherokee, Cleburne, Cullman, Etowah and 7 more2 hr
Jun 8, 11:24 AM CDTMesoscale DiscussionSPCAutauga, Bibb, Chilton, Dallas, Greene, Hale and 4 more66 min
Jun 8, 12:49 PM CDTSevere Thunderstorm WatchSPCAutauga, Barbour, Bibb, Bullock, Chilton, Clay and 21 more8 hr
Jun 8, 1:49 PM CDTSevere Thunderstorm WatchSPCButler, Choctaw, Clarke, Coffee, Conecuh, Covington and 8 more7 hr
Jun 8, 3:08 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Chilton, Choctaw, Clay, Coosa and 16 more97 min
Jun 8, 3:23 PM CDTMesoscale DiscussionSPCBarbour, Butler, Clarke, Coffee, Conecuh, Covington and 8 more97 min
Jun 8, 12:57 PM CDTMesoscale DiscussionSPCAlachua, Baker, Bradford, Brevard, Broward, Charlotte and 38 more3 hr
Jun 8, 11:45 AM CDTMesoscale DiscussionSPCBryan, Bulloch, Burke, Candler, Chatham, Columbia and 17 more3 hr

Nearby

Mesoscale Discussions in Florida, 2014Mesoscale Discussions in Georgia, 2014Mesoscale 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.