Alert archive / Tennessee / Mesoscale Discussions in 2012

Mesoscale Discussion 210

March 2, 20126 states

The Storm Prediction Center issued this mesoscale discussion at Mar 2, 2012, 11:46 AM CST for 6 states. It was in force for 29 min.

The area

The outline as issued.

The facts

Issued
Mar 2, 2012, 11:46 AM CST (17:46 UTC)
Expired
Mar 2, 2012, 12:15 PM CST
In force
29 min
Issued by
the Storm Prediction Center
All 66 counties

DeKalb County, AL, Jackson County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Bartow County, GA, Catoosa County, GA, Chattooga County, GA, Dade County, GA, Fannin County, GA, Floyd County, GA, Gilmer County, GA, Gordon County, GA, Murray County, GA, Pickens County, GA, Walker County, GA, Whitfield County, GA, Bell County, KY, McCreary County, KY, Whitley County, KY, Cherokee County, NC, Graham County, NC, Swain County, NC, Anderson County, TN, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Campbell County, TN, Claiborne County, TN, Cocke County, TN, Coffee County, TN, Cumberland County, TN, Fentress County, TN, Franklin County, TN, Grainger County, TN, Greene County, TN, Grundy County, TN, Hamblen County, TN, Hamilton County, TN, Hancock County, TN, Hawkins County, TN, Jefferson County, TN, Knox County, TN, Lincoln County, TN, Loudon County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Polk County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Scott County, TN, Sequatchie County, TN, Sevier County, TN, Union County, TN, Van Buren County, TN, Warren County, TN, Washington County, TN, White County, TN, Lee County, VA, Scott County, VA

The radar

The Knoxville radar (KMRX), 128 km from the middle of the area, began a volume at 17:46 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, 5.8 hours before the alert went out and 208 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 2012-03-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1667 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 2012-03-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 175 square meters per square second.1939587897117136Sfc1 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
1667 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
523 m above ground
0-6 km bulk shear
68 kt
0-1 km storm-relative helicity
175 m²/s²
0-3 km storm-relative helicity
169 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.1

Open this sounding in Storm Lab

The text

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

048 
ACUS11 KWNS 021747
SWOMCD
SPC MCD 021746
TNZ000-VAZ000-NCZ000-KYZ000-GAZ000-ALZ000-021815-

MESOSCALE DISCUSSION 0210
NWS STORM PREDICTION CENTER NORMAN OK
1146 AM CST FRI MAR 02 2012

AREAS AFFECTED...NRN AL...MIDDLE/ERN TN...FAR NWRN GA...FAR SWRN VA

CONCERNING...TORNADO WATCH 56...

VALID 021746Z - 021815Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 56 CONTINUES.

RADAR IMAGERY FROM 1740Z SHOWS ONGOING SUPERCELLS PRIMARILY
CONCENTRATED ACROSS MIDDLE TN ATTM...WITH TORNADOES REPORTED IN THE
PAST HR. THESE STORMS WILL CONTINUE TRACKING ENEWD AT AROUND 40
KTS...INTO A PROGRESSIVELY LESS UNSTABLE ENVIRONMENT.
HOWEVER...LATEST SFC OBS INDICATE THE AIR MASS IS RECOVERING QUICKLY
WITH TEMPERATURES HEATING AOA 60 DEG F...DESPITE THE PRESENCE OF
WIDESPREAD CLOUD COVER. AS THE ENVIRONMENT DESTABILIZES FURTHER...A
CONTINUED THREAT FOR TORNADOES...LARGE HAIL...AND DMGG WINDS SHOULD
EXIST DOWNSTREAM FROM THE ONGOING TSTMS.

FARTHER S...TSTMS HAVE MOVED NEWD OUT OF NRN AL...WITH SCT CLOUDS
ALLOWING FOR RAPID AIR MASS RECOVERY...WHILE THE ENVIRONMENT REMAINS
STRONGLY SHEARED. A NE-SW ORIENTED COULD BAND /NOTED ON
VISIBLE/...PRESUMABLY CO-LOCATED WITH A WEAK LOW-LEVEL CONFLUENCE
ZONE...COULD PROVIDE FOCUS FOR ADDITIONAL TSTM DEVELOPMENT LATER
THIS AFTERNOON AS CINH IS WEAK TO NIL. BOTH 14Z WRF-HRRR AND 12Z
WRF-NMM SUPPORT THIS SCENARIO...REDEVELOPING TSTMS AFTER 21Z.

..ROGERS.. 03/02/2012

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

ATTN...WFO...GSP...MRX...JKL...FFC...LMK...OHX...BMX...HUN...

LAT...LON   34378447 34208493 34078627 34188730 35098680 36748486
            36808385 36908259 36628237 36038247 35578328 34378447

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 2, 9:07 AM CSTMesoscale DiscussionSPCDeKalb, Jackson, Lawrence, Limestone, Madison, Marshall and 1 more53 min
Mar 2, 9:25 AM CSTTornado WatchSPCDeKalb, Jackson, Lawrence, Limestone, Madison, Marshall and 1 more5 hr
Mar 2, 12:57 PM CSTMesoscale DiscussionSPCColbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 2 more63 min
Mar 2, 1:20 PM CSTTornado WatchSPCBlount, Colbert, Cullman, DeKalb, Fayette, Franklin and 14 more9 hr
Mar 2, 2:42 PM CSTMesoscale DiscussionSPCAutauga, Baldwin, Bullock, Butler, Choctaw, Clarke and 18 more63 min
Mar 2, 3:25 PM CSTMesoscale DiscussionSPCColbert, Cullman, Fayette, Franklin, Lamar, Lauderdale and 9 more65 min
Mar 2, 4:37 PM CSTTornado WatchSPCAutauga, Baldwin, Barbour, Bibb, Blount, Bullock and 50 more7 hr
Mar 2, 5:41 PM CSTMesoscale DiscussionSPCAutauga, Barbour, Bibb, Blount, Bullock, Butler and 36 more2 hr
Mar 2, 2:30 AM CSTMesoscale DiscussionSPCBanks, Dawson, Fannin, Franklin, Gilmer, Habersham and 8 more90 min
Mar 2, 1:58 PM CSTMesoscale DiscussionSPCBartow, Catoosa, Cherokee, Dawson, Fannin, Forsyth and 14 more62 min
Mar 2, 2:19 PM CSTTornado WatchSPCBanks, Bartow, Catoosa, Chattooga, Cherokee, Dade and 23 more8 hr
Mar 2, 3:40 AM CSTMesoscale DiscussionSPCAdair, Barren, Breckinridge, Bullitt, Casey, Clinton and 20 more65 min
Mar 2, 9:22 AM CSTMesoscale DiscussionSPCAllen, Ballard, Barren, Breckinridge, Bullitt, Butler and 32 more113 min
Mar 2, 9:54 AM CSTTornado Watch PDSSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 16 more6 hr
Mar 2, 10:30 AM CSTMesoscale DiscussionSPCBath, Boone, Boyd, Bracken, Campbell, Carter and 12 more90 min
Mar 2, 12:02 PM CSTTornado Watch PDSSPCAdair, Allen, Anderson, Barren, Bath, Boone and 68 more8 hr
Mar 2, 12:05 PM CSTMesoscale DiscussionSPCAdair, Allen, Anderson, Ballard, Barren, Boone and 63 more85 min
Mar 2, 2:35 PM CSTMesoscale DiscussionSPCAdair, Allen, Anderson, Barren, Bath, Bell and 93 more85 min
Mar 2, 3:19 PM CSTTornado Watch PDSSPCBell, Boyd, Breathitt, Carter, Clay, Elliott and 18 more6 hr
Mar 2, 5:13 PM CSTMesoscale DiscussionSPCBath, Boyd, Breathitt, Carter, Clark, Clay and 30 more62 min
Mar 2, 10:28 AM CSTMesoscale DiscussionSPCCrockett, Dyer, Fayette, Gibson, Haywood, Lake and 5 more62 min

Nearby

Mesoscale Discussions in Tennessee, 2012Mesoscale Discussions in Georgia, 2012Mesoscale Discussions in Alabama, 2012Every 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; radar from the NEXRAD Level II archive.