Alert archive / Kentucky / Tornado Watches in 2020

Tornado Watch 72

March 28, 202010 counties in Indiana; 37 counties in Kentucky

The Storm Prediction Center issued this tornado watch at Mar 28, 2020, 9:15 PM EDT for 10 counties in Indiana; 37 counties in Kentucky. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Mar 28, 2020, 9:15 PM EDT (01:15 UTC)
Expired
Mar 29, 2020, 3:00 AM EDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 47 counties

Clark County, IN, Crawford County, IN, Dubois County, IN, Floyd County, IN, Harrison County, IN, Jefferson County, IN, Orange County, IN, Perry County, IN, Scott County, IN, Washington County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Boyle County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Casey County, KY, Cumberland County, KY, Edmonson County, KY, Franklin County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Henry County, KY, Jefferson County, KY, Larue County, KY, Logan County, KY, Marion County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Nelson County, KY, Ohio County, KY, Oldham County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Trimble County, KY, Warren County, KY, Washington County, KY, Woodford County, KY

The radar

The Louisville radar (KLVX), 18 km from the middle of the area, began a volume at 01:14 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
50%
One or more EF2 to EF5 tornadoes
30%
Ten or more severe wind reports
70%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
90%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Mar 28, 9:37 PM EDTTornado WarningLMKCrawford, Dubois, Perry23 min
Mar 28, 9:54 PM EDTSevere Thunderstorm WarningLMKCrawford, Harrison, Perry36 min
Mar 28, 9:56 PM EDTSevere Thunderstorm WarningLMKCrawford, Dubois, Orange, Perry, Washington34 min
Mar 28, 10:01 PM EDTSevere Thunderstorm WarningLMKButler, Edmonson, Grayson29 min
Mar 28, 10:02 PM EDTTornado WarningLMKCrawford, Harrison, Perry28 min
Mar 28, 10:05 PM EDTSevere Thunderstorm WarningLMKPerry25 min
Mar 28, 10:17 PM EDTSevere Thunderstorm WarningLMKBreckinridge, Meade28 min
Mar 28, 10:25 PM EDTSevere Thunderstorm WarningLMKScott, Washington35 min
Mar 28, 10:28 PM EDTSevere Thunderstorm WarningLMKClark, Crawford, Floyd, Harrison, Scott, Washington32 min
Mar 28, 10:35 PM EDTSevere Thunderstorm WarningLMKEdmonson, Grayson, Hardin, Hart, Larue25 min
Mar 28, 10:40 PM EDTSevere Thunderstorm WarningLMKFloyd, Harrison35 min
Mar 28, 11:02 PM EDTSevere Thunderstorm WarningLMKJefferson, Oldham, Shelby28 min
Mar 28, 11:02 PM EDTSevere Thunderstorm WarningLMKGreen, Hardin, Hart, Larue, Marion, Nelson43 min
Mar 28, 11:22 PM EDTSevere Thunderstorm WarningLMKEdmonson, Logan, Simpson, Warren28 min
Mar 28, 11:40 PM EDTFlash Flood WarningLMKButler, Edmonson, Grayson95 min
Mar 28, 11:54 PM EDTSevere Thunderstorm WarningLMKLogan, Simpson51 min
Mar 29, 12:14 AM EDTSevere Thunderstorm WarningLMKAllen, Logan, Simpson, Warren46 min
Mar 29, 12:35 AM EDTSevere Thunderstorm WarningLMKBarren, Edmonson, Grayson, Hart40 min
Mar 29, 12:48 AM EDTFlash Flood WarningLMKEdmonson, Hart, Larue, Warren58 min
Mar 29, 12:54 AM EDTSevere Thunderstorm WarningLMKBoyle, Garrard, Lincoln, Marion, Mercer, Washington20 min

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 00:00Z, 1.3 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 00:00Z on 2020-03-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 251 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 00:00Z on 2020-03-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 132 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
251 J/kg
Mixed-layer CIN
-107 J/kg
Mixed-layer LCL
1430 m above ground
0-6 km bulk shear
71 kt
0-1 km storm-relative helicity
132 m²/s²
0-3 km storm-relative helicity
206 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.5

Open this sounding in Storm Lab

The text

As transmitted.

919 
WWUS20 KWNS 290112
SEL2  
SPC WW 290112
INZ000-KYZ000-290700-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 72
NWS Storm Prediction Center Norman OK
915 PM EDT Sat Mar 28 2020

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Far southern Indiana
  Central Kentucky

* Effective this Saturday night and Sunday morning from 915 PM
  until 300 AM EDT.

* Primary threats include...
  A few tornadoes and a couple intense tornadoes possible
  Scattered damaging wind gusts to 70 mph likely
  Isolated large hail events to 1.5 inches in diameter possible

SUMMARY...Line of strong to severe thunderstorms will spread east
from western into central Kentucky with a couple discrete supercells
possible just ahead of it. Damaging winds and a few tornadoes are
the main hazards.

The tornado watch area is approximately along and 60 statute miles
east and west of a line from 35 miles north of Louisville KY to 20
miles south of Bowling Green KY. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU2).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and 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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 69...WW 70...WW 71...

AVIATION...Tornadoes and 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 24045.

...Grams

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 28, 8:38 PM EDTMesoscale DiscussionSPCCrawford, Floyd, Harrison, Perry, Spencer67 min
Mar 28, 10:23 PM EDTMesoscale DiscussionSPCBartholomew, Blackford, Brown, Dearborn, Decatur, Delaware and 20 more97 min
Mar 28, 11:34 PM EDTMesoscale DiscussionSPCDearborn, Ohio, Switzerland86 min
Mar 29, 2:50 AM EDTMesoscale DiscussionSPCClinton, Wayne85 min

Nearby

Tornado Watches in Kentucky, 2020Tornado Watches in Indiana, 2020Every tornado watch in 2020

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.