Alert archive / Tennessee / Mesoscale Discussions in 2014

Mesoscale Discussion 1890

October 14, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Oct 14, 2014, 6:23 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Oct 14, 2014, 6:23 AM CDT (11:23 UTC)
Expired
Oct 14, 2014, 8:30 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
20%
All 28 counties

Jackson County, AL, Dade County, GA, Adair County, KY, Barren County, KY, Clinton County, KY, Cumberland County, KY, Green County, KY, Metcalfe County, KY, Monroe County, KY, Russell County, KY, Wayne County, KY, Bledsoe County, TN, Clay County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Grundy County, TN, Jackson County, TN, Macon County, TN, Marion County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Sequatchie County, TN, Smith County, TN, Van Buren County, TN, Warren County, TN, White County, TN

The radar

The Nashville radar (KOHX), 91 km from the middle of the area, began a volume at 11:26 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

Nashville Metro, TN (KBNA), launched 00:00Z, 11.4 hours before the alert went out and 90 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, Nashville Metro, TN at 00:00Z on 2014-10-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 187 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, Nashville Metro, TN at 00:00Z on 2014-10-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 389 square meters per square second.19395878Sfc1 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
187 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
1109 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
389 m²/s²
0-3 km storm-relative helicity
568 m²/s²
Significant tornado parameter
0.4
Supercell composite
5.3

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
Oct 13, 7:23 PM CDTTornado WatchSPCBaldwin, Butler, Choctaw, Clarke, Conecuh, Covington and 6 more7 hr
Oct 13, 7:33 PM CDTMesoscale DiscussionSPCBlount, Cullman, Fayette, Jackson, Jefferson, Lauderdale and 9 more57 min
Oct 13, 8:57 PM CDTMesoscale DiscussionSPCBarbour, Bullock, Calhoun, Chambers, Cherokee, Clay and 11 more2 hr
Oct 13, 10:44 PM CDTTornado WatchSPCBarbour, Bullock, Chambers, Coffee, Coosa, Dale and 10 more6 hr
Oct 13, 11:52 PM CDTMesoscale DiscussionSPCAutauga, Butler, Coffee, Coosa, Covington, Crenshaw and 5 more53 min
Oct 14, 2:07 AM CDTMesoscale DiscussionSPCBarbour, Chambers, Dale, Henry, Houston, Lee and 2 more83 min
Oct 14, 3:27 AM CDTTornado WatchSPCHouston8 hr
Oct 14, 3:06 AM CDTTornado WatchSPCBaldwin, Banks, Barrow, Bartow, Bibb, Bleckley and 59 more6 hr
Oct 14, 5:22 AM CDTMesoscale DiscussionSPCBulloch, Burke, Candler, Columbia, Elbert, Emanuel and 9 more83 min
Oct 14, 5:57 AM CDTTornado WatchSPCBulloch, Burke, Candler, Columbia, Effingham, Elbert and 27 more7 hr
Oct 14, 7:35 AM CDTMesoscale DiscussionSPCBaker, Berrien, Brooks, Calhoun, Colquitt, Cook and 12 more85 min
Oct 14, 10:21 AM CDTMesoscale DiscussionSPCBrooks, Clinch, Cook, Echols, Lanier, Lowndes and 2 more114 min
Oct 14, 10:43 AM CDTSevere Thunderstorm WatchSPCAppling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 20 more7 hr
Oct 14, 12:31 PM CDTMesoscale DiscussionSPCBaldwin, Banks, Barrow, Bibb, Butts, Clarke and 45 more2 hr
Oct 14, 12:59 PM CDTTornado WatchSPCBaldwin, Banks, Barrow, Bibb, Burke, Butts and 53 more11 hr
Oct 14, 1:58 PM CDTMesoscale DiscussionSPCBryan, Bulloch, Candler, Chatham, Effingham, Evans and 7 more32 min
Oct 14, 2:07 PM CDTSevere Thunderstorm WatchSPCBryan, Bulloch, Candler, Chatham, Effingham, Evans and 6 more6 hr
Oct 14, 5:29 PM CDTMesoscale DiscussionSPCColumbia, Elbert, Franklin, Glascock, Greene, Hancock and 9 more91 min
Oct 13, 10:41 PM CDTMesoscale DiscussionSPCAdair, Anderson, Bath, Bourbon, Boyle, Bracken and 46 more64 min

Nearby

Mesoscale Discussions in Tennessee, 2014Mesoscale Discussions in Kentucky, 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.