Alert archive / Tennessee / Mesoscale Discussions in 2011

Mesoscale Discussion 901

May 23, 20114 states

The Storm Prediction Center issued this mesoscale discussion at May 23, 2011, 4:24 PM CDT for 4 states. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued
May 23, 2011, 4:24 PM CDT (21:24 UTC)
Expired
May 23, 2011, 6:00 PM CDT
In force
96 min
Issued by
the Storm Prediction Center
All 63 counties

Lauderdale County, AL, Massac County, IL, Allen County, KY, Barren County, KY, Butler County, KY, Caldwell County, KY, Calloway County, KY, Christian County, KY, Crittenden County, KY, Daviess County, KY, Edmonson County, KY, Graves County, KY, Grayson County, KY, Hart County, KY, Hopkins County, KY, Livingston County, KY, Logan County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, McLean County, KY, Muhlenberg County, KY, Ohio County, KY, Simpson County, KY, Todd County, KY, Trigg County, KY, Warren County, KY, Webster County, KY, Bedford County, TN, Benton County, TN, Carroll County, TN, Cheatham County, TN, Chester County, TN, Davidson County, TN, Decatur County, TN, Dickson County, TN, Gibson County, TN, Giles County, TN, Hardeman County, TN, Hardin County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lawrence County, TN, Lewis County, TN, Macon County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Perry County, TN, Robertson County, TN, Rutherford County, TN, Stewart County, TN, Sumner County, TN, Trousdale County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN, Wilson County, TN

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, 9.4 hours before the alert went out and 77 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 2011-05-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 11 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 2011-05-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -255 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
11 J/kg
Mixed-layer CIN
-260 J/kg
Mixed-layer LCL
946 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
-255 m²/s²
0-3 km storm-relative helicity
-136 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

253 
ACUS11 KWNS 232124
SWOMCD
SPC MCD 232124 
KYZ000-TNZ000-ALZ000-INZ000-ILZ000-MSZ000-232300-

MESOSCALE DISCUSSION 0901
NWS STORM PREDICTION CENTER NORMAN OK
0424 PM CDT MON MAY 23 2011

AREAS AFFECTED...PORTIONS OF WRN/CNTRL KY...WRN/MIDDLE TN

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY 

VALID 232124Z - 232300Z

SVR THUNDERSTORM THREAT WILL INCREASE DURING THE LATE AFTERNOON AND
EVENING ACROSS PORTIONS OF WRN/CNTRL KY AND WRN/MIDDLE TN. SVR
THUNDERSTORM WATCH WILL LIKELY BE NEEDED.

QLCS MOVING E AT AROUND 40 KT IS EXPECTED TO MOVE ACROSS PORTIONS OF
WRN/CNTRL KY AND WRN/MIDDLE TN THROUGH THE EVENING...WHERE RESERVOIR
OF MLCAPE VALUES AOA 2000 J/KG RESIDES. AMPLE UNIDIRECTIONAL DEEP
LAYER SHEAR PROFILES RESIDES ACROSS THE REGION...WITH EFFECTIVE BULK
SHEAR VALUES AROUND 40-50 KT. THIS WILL FAVOR QLCS MAINTENANCE AS
UPPER IMPULSE MOVES E OVER THE LWR OH VALLEY. A NEW DOWNSTREAM WW
WILL LIKELY BE NEEDED DURING THE NEXT HR OR TWO.

..GARNER.. 05/23/2011

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

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

LAT...LON   37328583 35358624 34838748 34978886 35318920 37208885
            37858722 37328583

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 22, 7:52 PM CDTMesoscale DiscussionSPCBond, Calhoun, Clinton, Greene, Jersey, Macoupin and 6 more53 min
May 22, 8:26 PM CDTTornado WatchSPCBond, Calhoun, Cass, Champaign, Christian, Clay and 35 more8 hr
May 22, 9:35 PM CDTMesoscale DiscussionSPCDeKalb, DuPage, Grundy, Iroquois, Kane, Kankakee and 6 more55 min
May 22, 10:24 PM CDTMesoscale DiscussionSPCClark, Clay, Coles, Crawford, Cumberland, Edgar and 9 more66 min
May 23, 7:25 AM CDTMesoscale DiscussionSPCEdgar, Vermilion65 min
May 23, 10:55 AM CDTSevere Thunderstorm WatchSPCAlexander, Bond, Calhoun, Clinton, Edwards, Fayette and 27 more7 hr
May 23, 12:37 PM CDTMesoscale DiscussionSPCBond, Christian, Clark, Clay, Clinton, Coles and 34 more83 min
May 23, 12:54 PM CDTSevere Thunderstorm WatchSPCChampaign, Christian, Clark, Clay, Coles, Crawford and 13 more5 hr
May 23, 2:52 PM CDTMesoscale DiscussionSPCClark, Clay, Coles, Crawford, Cumberland, Edgar and 8 more53 min
May 23, 3:58 PM CDTMesoscale DiscussionSPCAlexander, Edwards, Franklin, Gallatin, Hamilton, Hardin and 14 more92 min
May 23, 3:20 AM CDTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bell and 76 more85 min
May 23, 3:28 PM CDTSevere Thunderstorm WatchSPCAnderson, Boone, Bourbon, Bracken, Breckinridge, Bullitt and 30 more6 hr
May 23, 4:57 PM CDTSevere Thunderstorm WatchSPCAllen, Barren, Butler, Caldwell, Calloway, Christian and 23 more4 hr
May 23, 5:20 PM CDTMesoscale DiscussionSPCAnderson, Boone, Bourbon, Bracken, Breckinridge, Bullitt and 27 more55 min
May 23, 6:20 PM CDTMesoscale DiscussionSPCBath, Boyd, Breathitt, Carter, Elliott, Estill and 19 more85 min
May 22, 11:46 PM CDTMesoscale DiscussionSPCDyer, Lake89 min
May 23, 1:16 PM CDTMesoscale DiscussionSPCLake89 min
May 23, 1:34 PM CDTSevere Thunderstorm WatchSPCCrockett, Dyer, Fayette, Haywood, Lake, Lauderdale and 3 more6 hr

Nearby

Mesoscale Discussions in Tennessee, 2011Mesoscale Discussions in Kentucky, 2011Mesoscale Discussions in Alabama, 2011Every mesoscale discussion in 2011

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.