Alert archive / Tennessee / Mesoscale Discussions in 2012

Mesoscale Discussion 1063

June 4, 20125 states

The Storm Prediction Center issued this mesoscale discussion at Jun 4, 2012, 9:11 PM CDT for 5 states. It was in force for 94 min.

The area

The outline as issued.

The facts

Issued: Jun 4, 2012, 9:11 PM CDT (02:11 UTC)
Expired: Jun 4, 2012, 10:45 PM CDT
In force: 94 min
Issued by: the Storm Prediction Center

All 69 counties

Mississippi County, AR, Alexander County, IL, Hardin County, IL, Johnson County, IL, Massac County, IL, Pope County, IL, Pulaski County, IL, Union County, IL, Ballard County, KY, Caldwell County, KY, Calloway County, KY, Carlisle County, KY, Christian County, KY, Crittenden County, KY, Fulton County, KY, Graves County, KY, Hickman County, KY, Livingston County, KY, Lyon County, KY, Marshall County, KY, McCracken County, KY, Todd County, KY, Trigg County, KY, Dunklin County, MO, Mississippi County, MO, New Madrid County, MO, Pemiscot County, MO, Scott 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, Giles 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, Lawrence County, TN, Lewis County, TN, Lincoln County, TN, Madison County, TN, Marshall County, TN, Maury County, TN, McNairy County, TN, Montgomery County, TN, Moore County, TN, Obion County, TN, Perry County, TN, Robertson County, TN, Shelby County, TN, Stewart County, TN, Tipton County, TN, Wayne County, TN, Weakley County, TN, Williamson County, TN

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 357Jun 4, 9:45 PM CDT

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 2.2 hours before the alert went out and 135 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 162 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 1734 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

693 
ACUS11 KWNS 050211
SWOMCD
SPC MCD 050211 
ALZ000-TNZ000-KYZ000-ILZ000-MSZ000-MOZ000-ARZ000-050345-

MESOSCALE DISCUSSION 1063
NWS STORM PREDICTION CENTER NORMAN OK
0911 PM CDT MON JUN 04 2012

AREAS AFFECTED...FAR WRN KY...EXTREME SERN MO...WRN TN

CONCERNING...SEVERE THUNDERSTORM WATCH 353...

VALID 050211Z - 050345Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 353
CONTINUES.

SUMMARY...STRONG TO SEVERE STORMS ARE EXPECTED TO CONTINUE FOR A FEW
MORE HOURS THIS EVENING. GIVEN THE 03Z EXPIRATION TIME OF WW 353 A
NEW SVR WATCH WILL LIKELY BE NEEDED FOR PORTIONS OF WRN KY INTO WRN
TN. STRONG TO LOCALLY DAMAGING WINDS AND HAIL WILL BE POSSIBLE WITH
THE STRONGEST STORMS.

DISCUSSION...SEVERE THUNDERSTORMS ACROSS EXTREME SERN MO MOVING INTO
WRN KY ARE EXPECTED TO CONTINUE S/SEWD THIS EVENING WITH STRONG
WINDS AND LARGE HAIL POSSIBLE. GIVEN THE 03Z EXPIRATION TIME OF WW
353...A NEW SVR WATCH WILL LIKELY BE NEEDED AND WILL EXTEND INTO
MUCH OF THE WESTERN HALF OF TN. HERE...THE AIRMASS REMAINS
MODERATELY UNSTABLE AND MOIST PER 00Z BNA ROAB AND 01Z SFC ANALYSIS.
CURRENT CONVECTION APPEARS TO HAVE RE-INTENSIFIED FROM A PERIOD OF
EARLIER WEAKENING DUE TO AN INCREASE IN DEEP LAYER SHEAR ON THE
ORDER OF 30-40 KT AS NOTED ON REGIONAL WSR-88D VAD WIND PROFILES. IN
CONJUNCTION WITH A SWD MOVING SFC BOUNDARY...THIS INCREASE IN DEEP
LAYER SHEAR SHOULD HELP TO MAINTAIN STORM ORGANIZATION FOR AT LEAST
A FEW MORE HOURS LATE THIS EVENING.

..LEITMAN/CORFIDI.. 06/05/2012

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

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

LAT...LON   37488961 37598843 37118729 36238665 35918651 35298630
            34988628 34998677 34988756 35029024 36019017 37028990
            37488961

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 4, 8:03 PM CDT	Mesoscale Discussion	SPC	Ashley, Chicot, Desha, Drew	87 min
Jun 4, 9:43 PM CDT	Severe Thunderstorm Watch	SPC	Mississippi	6 hr
Jun 5, 1:49 AM CDT	Mesoscale Discussion	SPC	Chester, Decatur, Giles, Hardin, Henderson, Lawrence and 6 more	56 min

Nearby

Mesoscale Discussions in Tennessee, 2012 Mesoscale Discussions in Kentucky, 2012 Mesoscale Discussions in Illinois, 2012 Every mesoscale discussion in 2012

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.