Alert archive / Tennessee / Mesoscale Discussions in 2014

Mesoscale Discussion 821

June 4, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2014, 6:57 PM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 4, 2014, 6:57 PM CDT (23:57 UTC)
Expired
Jun 4, 2014, 9:00 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 81 counties

Alexander County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Allen County, KY, Ballard County, KY, Barren County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Clinton County, KY, Crittenden County, KY, Cumberland County, KY, Edmonson County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Hopkins County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Metcalfe County, KY, Monroe County, KY, Muhlenberg County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Warren County, KY, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Scott County, MO, Stoddard County, MO, Benton County, TN, Cannon County, TN, Carroll County, TN, Cheatham County, TN, Clay County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, DeKalb County, TN, Dickson County, TN, Dyer County, TN, Fentress County, TN, Gibson County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Jackson County, TN, Lake County, TN, Lauderdale County, TN, Macon County, TN, Madison County, TN, Maury County, TN, Montgomery County, TN, Obion County, TN, Overton County, TN, Perry County, TN, Pickett County, TN, Putnam County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Van Buren County, TN, Warren County, TN, Weakley County, TN, White County, TN, Williamson County, TN, Wilson County, TN

The radar

The Ft Campbell radar (KHPX), 62 km from the middle of the area, began a volume at 23:58 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

Nashville Metro, TN (KBNA), launched 12:00Z, 12.0 hours before the alert went out and 116 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 12:00Z on 2014-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 797 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 12:00Z on 2014-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 47 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
797 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
869 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
47 m²/s²
0-3 km storm-relative helicity
17 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

367 
ACUS11 KWNS 042358
SWOMCD
SPC MCD 042357 
TNZ000-KYZ000-ILZ000-MOZ000-ARZ000-050200-

MESOSCALE DISCUSSION 0821
NWS STORM PREDICTION CENTER NORMAN OK
0657 PM CDT WED JUN 04 2014

AREAS AFFECTED...WRN KY...NRN AND WRN TN...SERN MO

CONCERNING...TORNADO WATCH 219...

VALID 042357Z - 050200Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 219 CONTINUES.

SUMMARY...STORMS WILL CONTINUE SWD ACROSS KY AND INTO TN THIS
EVENING. THE TORNADO THREAT IS GREATEST IN KY...WITH DAMAGING WINDS
EVENTUALLY SPREADING SWD INTO TN. A NEW WATCH WILL BE NEEDED.

DISCUSSION...A BROKEN LINE OF SEVERE STORMS CONTINUES TO SHIFT SEWD
ACROSS THE LOWER OH VALLEY INTO WRN KY BENEATH A STRONG MIDLEVEL JET
MAX AND IN A STRONGLY UNSTABLE AIR MASS. WIND PROFILES CONTINUE TO
BE FAVORABLE FOR SUPERCELLS AS WELL AS BOWS WITH NWLY FLOW ALOFT AND
NEAR THE INSTABILITY AXIS. A NEW WATCH WILL BE REQUIRED PRIOR TO
EXPIRATION TIME...AND ALSO EXTENDING INTO TN.

..JEWELL/CORFIDI.. 06/04/2014

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MRX...JKL...LMK...OHX...PAH...MEG...

LAT...LON   35538967 36099029 36549039 37198991 37418950 37448800
            37418665 37278569 36548480 36028492 35608548 35548640
            35558851 35538967

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 3, 8:05 PM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Greene, Jersey, Morgan and 2 more85 min
Jun 3, 9:25 PM CDTSevere Thunderstorm WatchSPCAdams, Brown, Pike5 hr
Jun 3, 11:04 PM CDTSevere Thunderstorm WatchSPCCass, Fulton, Logan, Mason, Menard, Morgan and 4 more4 hr
Jun 4, 1:29 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Champaign, Christian and 23 more91 min
Jun 4, 1:52 AM CDTSevere Thunderstorm WatchSPCChampaign, Christian, Coles, DeWitt, Douglas, Edgar and 6 more3 hr
Jun 4, 3:46 AM CDTMesoscale DiscussionSPCChampaign, Coles, Douglas, Edgar, Moultrie, Piatt and 2 more59 min
Jun 4, 5:00 AM CDTSevere Thunderstorm WatchSPCBond, Calhoun, Clinton, Fayette, Greene, Jersey and 8 more4 hr
Jun 4, 7:01 AM CDTMesoscale DiscussionSPCBond, Clinton, Fayette, Madison, Monroe, Saint Clair89 min
Jun 4, 12:20 PM CDTMesoscale DiscussionSPCAlexander, Clay, Clinton, Edwards, Franklin, Gallatin and 22 more115 min
Jun 4, 2:21 PM CDTTornado WatchSPCAlexander, Clay, Clinton, Edwards, Franklin, Gallatin and 22 more6 hr
Jun 4, 11:11 AM CDTMesoscale DiscussionSPCBath, Boyd, Carter, Elliott, Fleming, Floyd and 13 more2 hr
Jun 4, 1:51 PM CDTTornado WatchSPCAdair, Anderson, Bath, Bell, Boone, Bourbon and 73 more10 hr
Jun 4, 5:34 PM CDTMesoscale DiscussionSPCBath, Bourbon, Boyd, Breathitt, Carter, Clark and 36 more116 min
Jun 3, 7:04 PM CDTMesoscale DiscussionSPCAndrew, Atchison, DeKalb, Gentry, Harrison, Holt and 2 more56 min
Jun 3, 9:41 PM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Chariton and 16 more64 min
Jun 3, 11:30 PM CDTMesoscale DiscussionSPCAudrain, Boone, Caldwell, Callaway, Carroll, Cass and 23 more60 min
Jun 3, 11:45 PM CDTSevere Thunderstorm WatchSPCAudrain, Benton, Boone, Callaway, Carroll, Cass and 25 more5 hr
Jun 4, 12:28 AM CDTMesoscale DiscussionSPCAndrew, Atchison, Buchanan, Holt, Nodaway, Platte62 min
Jun 4, 12:50 AM CDTSevere Thunderstorm WatchSPCAndrew, Atchison, Buchanan, Caldwell, Clay, Clinton and 11 more3 hr
Jun 4, 3:32 AM CDTMesoscale DiscussionSPCBenton, Camden, Cole, Cooper, Henry, Johnson and 5 more88 min
Jun 4, 12:54 PM CDTMesoscale DiscussionSPCBollinger, Butler, Carter, Dent, Dunklin, Howell and 10 more2 hr
Jun 4, 3:47 PM CDTMesoscale DiscussionSPCBarry, Camden, Cedar, Christian, Dade, Dallas and 14 more118 min

Nearby

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