Alert archive / Tennessee / Mesoscale Discussions in 2003

Mesoscale Discussion 849

May 8, 20035 states

The Storm Prediction Center issued this mesoscale discussion at May 8, 2003, 12:24 PM CDT for 5 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 8, 2003, 12:24 PM CDT (17:24 UTC)
Expired
May 8, 2003, 2:30 PM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 77 counties

Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Mississippi County, AR, Poinsett County, AR, St. Francis County, AR, Massac County, IL, Ballard County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian 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, Muhlenberg County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Warren County, KY, Butler County, MO, Carter County, MO, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Ripley County, MO, Scott County, MO, Stoddard County, MO, Bedford County, TN, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Crockett County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Lewis County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Obion County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Shelby County, TN, Stewart County, TN, Sumner County, TN, Tipton County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 5.4 hours before the alert went out and 144 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 2003-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 360 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 2003-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 square meters per square second.1939587897Sfc1 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
360 J/kg
Mixed-layer CIN
-84 J/kg
Mixed-layer LCL
628 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
107 m²/s²
0-3 km storm-relative helicity
196 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

521 
ACUS11 KWNS 081724
SWOMCD
SPC MCD 081724 
KYZ000-TNZ000-ILZ000-MOZ000-ARZ000-MSZ000-081930-

MESOSCALE DISCUSSION 0849
NWS STORM PREDICTION CENTER NORMAN OK
1224 PM CDT THU MAY 08 2003

AREAS AFFECTED...WRN AND MIDDLE TN  AND SWRN KY

CONCERNING...TORNADO WATCH 300...

VALID 081724Z - 081930Z

AN ISOLATED SUPERCELL THUNDERSTORM OVER DYERS COUNTY IN NWRN TN
SHOULD CONTINUE TO MAINTAIN ITS INTENSITY WHILE TRACKING ESEWD
AROUND 20 KTS OVER THE NEXT 1-2 HOURS. LOW LEVEL SHEAR WILL CONTINUE
TO BE MAXIMIZED ALONG A WEAK WIND SHIFT LINE EXTENDING FROM DYERS
COUNTY ESEWD INTO MADISON AND HENDERSON COUNTIES. IF THIS SUPERCELL
CONTINUES TO TRACK ALONG THIS BOUNDARY...ENHANCED LOW LEVEL S-R FLOW
AND HELICITY WILL CONTINUE TO FAVOR ISOLATED TORNADOES. 

OTHER CONVECTION...IN THE FORM OF LEFT MOVING SUPERCELL/S WILL TRACK
NEWD THROUGH SWRN KY WHILE POSING A THREAT FOR ISOLATED DAMAGING
WINDS AND POSSIBLE LARGE HAIL. 


..CROSBIE.. 05/08/2003

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

ATTN...WFO...LMK...OHX...PAH...MEG...

35378633 34849101 36999097 37468632

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 8, 1:18 AM CDTMesoscale DiscussionSPCBenton, Garland, Grant, Hot Spring, Lincoln, Montgomery and 2 more3 hr
May 8, 1:55 AM CDTSevere Thunderstorm WatchSPCBenton, Carroll5 hr
May 8, 5:02 AM CDTMesoscale DiscussionSPCCrawford, Franklin, Howard, Johnson, Logan, Madison and 8 more2 hr
May 8, 6:20 AM CDTTornado WatchSPCCrawford, Franklin, Logan, Montgomery, Scott, Sebastian and 1 more3 hr
May 8, 7:33 AM CDTMesoscale DiscussionSPCCrawford, Franklin, Johnson, Logan, Montgomery, Scott and 2 more87 min
May 8, 8:25 AM CDTTornado WatchSPCBaxter, Boone, Cleburne, Conway, Craighead, Crittenden and 18 more5 hr
May 8, 9:55 AM CDTMesoscale DiscussionSPCMississippi3 hr
May 8, 10:21 AM CDTMesoscale DiscussionSPCClay, Cleburne, Craighead, Greene, Independence, Izard and 8 more84 min
May 8, 10:25 AM CDTTornado WatchSPCClay, Craighead, Crittenden, Cross, Greene, Mississippi and 3 more6 hr
May 8, 11:59 AM CDTMesoscale DiscussionSPCClay, Cleburne, Craighead, Greene, Independence, Izard and 8 more2 hr
May 8, 5:31 PM CDTMesoscale DiscussionSPCBenton, Carroll, Crawford, Franklin, Johnson, Logan and 4 more59 min
May 8, 5:45 PM CDTTornado WatchSPCBenton, Crawford, Sebastian, Washington5 hr
May 8, 6:38 PM CDTMesoscale DiscussionSPCBenton, Crawford, Washington2 hr
May 8, 12:20 PM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 42 more4 hr
May 8, 2:11 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Christian, Clay and 35 more2 hr
May 8, 2:20 PM CDTMesoscale DiscussionSPCMassac85 min
May 8, 3:40 PM CDTTornado WatchSPCBond, Brown, Cass, Champaign, Christian, Clark and 34 more5 hr
May 8, 5:15 PM CDTTornado WatchSPCEdwards, Gallatin, Hamilton, Hardin, Massac, Pope and 4 more6 hr
May 8, 3:51 AM CDTMesoscale DiscussionSPCAndrew, Atchison, Barry, Barton, Benton, Buchanan and 32 more3 hr
May 8, 4:15 AM CDTSevere Thunderstorm WatchSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 27 more7 hr
May 8, 7:50 AM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 27 more85 min
May 8, 7:55 AM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 27 more95 min
May 8, 1:50 PM CDTTornado WatchSPCAtchison7 hr
May 8, 4:16 PM CDTMesoscale DiscussionSPCAndrew, Barton, Bates, Benton, Buchanan, Caldwell and 35 more29 min
May 8, 4:40 PM CDTTornado WatchSPCAndrew, Barton, Bates, Buchanan, Caldwell, Carroll and 24 more6 hr

Nearby

Mesoscale Discussions in Tennessee, 2003Mesoscale Discussions in Kentucky, 2003Mesoscale Discussions in Missouri, 2003Every mesoscale discussion in 2003

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.