Alert archive / Tennessee / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 71

March 31, 201615 counties in Kentucky; 26 counties in Tennessee

The Storm Prediction Center issued this severe thunderstorm watch at Mar 31, 2016, 3:59 PM CDT for 15 counties in Kentucky; 26 counties in Tennessee. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Mar 31, 2016, 3:59 PM CDT (20:59 UTC)
Expired
Mar 31, 2016, 9:08 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 41 counties

Adair County, KY, Allen County, KY, Barren County, KY, Casey County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Green County, KY, Hart County, KY, Metcalfe County, KY, Monroe County, KY, Russell County, KY, Simpson County, KY, Taylor County, KY, Warren County, KY, Bedford County, TN, Cannon County, TN, Cheatham County, TN, Clay County, TN, Davidson County, TN, DeKalb County, TN, Dickson County, TN, Giles County, TN, Hickman County, TN, Jackson County, TN, Lawrence County, TN, Lewis County, TN, Macon County, TN, Marshall County, TN, Maury County, TN, Overton County, TN, Perry County, TN, Putnam County, TN, Robertson County, TN, Rutherford County, TN, Smith County, TN, Sumner County, TN, Trousdale County, TN, Wayne County, TN, Williamson County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 46 km from the middle of the area, began a volume at 20:59 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
20%
One or more EF2 to EF5 tornadoes
2%
Ten or more severe wind reports
40%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

24 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Mar 31, 4:06 PM CDTSevere Thunderstorm WarningOHXDickson, Hickman, Houston, Humphreys, Perry39 min
Mar 31, 4:14 PM CDTTornado WarningOHXHickman, Lewis, Perry46 min
Mar 31, 4:21 PM CDTSevere Thunderstorm WarningLMKBarren, Edmonson, Green, Hart, Metcalfe24 min
Mar 31, 4:37 PM CDTSevere Thunderstorm WarningOHXCheatham, Davidson, Dickson, Montgomery, Robertson23 min
Mar 31, 4:45 PM CDTSevere Thunderstorm WarningLMKAdair, Barren, Edmonson, Green, Hart, Metcalfe30 min
Mar 31, 4:48 PM CDTTornado WarningOHXHickman, Lewis, Maury42 min
Mar 31, 4:49 PM CDTSevere Thunderstorm WarningOHXLewis, Wayne26 min
Mar 31, 5:12 PM CDTSevere Thunderstorm WarningLMKAdair, Casey, Cumberland, Green, Metcalfe, Russell and 1 more48 min
Mar 31, 5:14 PM CDTSevere Thunderstorm WarningOHXLawrence, Lewis, Wayne46 min
Mar 31, 5:18 PM CDTTornado WarningOHXMaury27 min
Mar 31, 5:42 PM CDTTornado WarningOHXMarshall, Maury29 min
Mar 31, 5:44 PM CDTTornado WarningOHXGiles, Lawrence31 min
Mar 31, 6:06 PM CDTSevere Thunderstorm WarningOHXBedford, Marshall, Rutherford39 min
Mar 31, 6:14 PM CDTTornado WarningOHXGiles, Lawrence31 min
Mar 31, 6:44 PM CDTSevere Thunderstorm WarningOHXCannon, DeKalb, Warren, Wilson31 min
Mar 31, 6:47 PM CDTTornado WarningOHXGiles, Marshall28 min
Mar 31, 6:53 PM CDTSevere Thunderstorm WarningOHXSmith, Sumner, Trousdale, Wilson22 min
Mar 31, 7:08 PM CDTTornado WarningOHXGiles22 min
Mar 31, 7:22 PM CDTSevere Thunderstorm WarningOHXLawrence23 min
Mar 31, 7:25 PM CDTTornado WarningOHXGiles35 min
Mar 31, 7:44 PM CDTSevere Thunderstorm WarningOHXGiles, Lawrence31 min
Mar 31, 7:46 PM CDTTornado WarningOHXGiles, Lawrence29 min
Mar 31, 8:12 PM CDTSevere Thunderstorm WarningOHXGiles, Lawrence33 min
Mar 31, 8:28 PM CDTFlash Flood WarningOHXGiles, Lawrence, Wayne3 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 9.0 hours before the alert went out and 56 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 2016-03-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2016-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 673 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
834 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
673 m²/s²
0-3 km storm-relative helicity
836 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

664 
WWUS20 KWNS 312057
SEL1  
SPC WW 312057
KYZ000-TNZ000-010300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 71
NWS STORM PREDICTION CENTER NORMAN OK
400 PM CDT THU MAR 31 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 
  SOUTH CENTRAL KENTUCKY
  MIDDLE TENNESSEE

* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 400 PM UNTIL
  1000 PM CDT.

* PRIMARY THREATS INCLUDE...
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE
  A TORNADO OR TWO POSSIBLE

SUMMARY...ORGANIZED THUNDERSTORMS IN WESTERN TENNESSEE AND SOUTH
CENTRAL KENTUCKY WILL LIKELY PERSIST AND MOVE EASTWARD THROUGH THIS
EVENING.  AN ISOLATED TORNADO COULD OCCUR IN SOUTHWEST MIDDLE
TENNESSEE...BUT THE MAIN RISKS SHOULD BE DAMAGING WINDS AND LARGE
HAIL.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45
STATUTE MILES EAST AND WEST OF A LINE FROM 125 MILES NORTHEAST OF
NASHVILLE TENNESSEE TO 85 MILES SOUTH SOUTHWEST OF NASHVILLE
TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 68...WW 69...WW 70...

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 26035.


...THOMPSON

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 31, 10:26 AM CDTMesoscale DiscussionSPCCalloway, Fulton, Graves, Hickman3 hr
Mar 31, 10:58 AM CDTSevere Thunderstorm WatchSPCBallard, Caldwell, Calloway, Carlisle, Christian, Crittenden and 14 more5 hr
Mar 31, 2:14 PM CDTMesoscale DiscussionSPCButler, Caldwell, Calloway, Christian, Graves, Hopkins and 9 more91 min
Mar 31, 3:48 PM CDTMesoscale DiscussionSPCLogan, Simpson, Warren87 min
Mar 31, 5:09 PM CDTMesoscale DiscussionSPCBallard, Caldwell, Carlisle, Crittenden, Daviess, Graves and 10 more96 min
Mar 31, 5:49 PM CDTMesoscale DiscussionSPCAdair, Allen, Barren, Boyle, Breathitt, Casey and 28 more56 min
Mar 31, 2:35 PM CDTTornado WatchSPCChester, Decatur, Fayette, Hardeman, Hardin, Henderson and 2 more7 hr
Mar 31, 5:58 PM CDTTornado WatchSPCBedford, Cannon, Coffee, Franklin, Giles, Grundy and 8 more7 hr
Mar 31, 6:52 PM CDTMesoscale DiscussionSPCFranklin, Giles, Lincoln, Moore53 min

Nearby

Severe Thunderstorm Watches in Tennessee, 2016Severe Thunderstorm Watches in Kentucky, 2016Every severe thunderstorm watch in 2016

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.