Alert archive / Kentucky / Tornado Watches in 2018

Tornado Watch 31

April 3, 201847 counties in Indiana; 68 counties in Kentucky; 22 counties in Ohio

The Storm Prediction Center issued this tornado watch at Apr 3, 2018, 7:30 PM EDT for 47 counties in Indiana; 68 counties in Kentucky; 22 counties in Ohio. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 3, 2018, 7:30 PM EDT (23:30 UTC)
Expired
Apr 4, 2018, 12:32 AM EDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
65 kt
All 137 counties

Bartholomew County, IN, Boone County, IN, Brown County, IN, Clark County, IN, Clay County, IN, Crawford County, IN, Daviess County, IN, Dearborn County, IN, Decatur County, IN, Delaware County, IN, Dubois County, IN, Fayette County, IN, Floyd County, IN, Franklin County, IN, Greene County, IN, Hamilton County, IN, Hancock County, IN, Harrison County, IN, Hendricks County, IN, Henry County, IN, Jackson County, IN, Jefferson County, IN, Jennings County, IN, Johnson County, IN, Knox County, IN, Lawrence County, IN, Madison County, IN, Marion County, IN, Martin County, IN, Monroe County, IN, Morgan County, IN, Ohio County, IN, Orange County, IN, Owen County, IN, Perry County, IN, Putnam County, IN, Randolph County, IN, Ripley County, IN, Rush County, IN, Scott County, IN, Shelby County, IN, Sullivan County, IN, Switzerland County, IN, Tipton County, IN, Union County, IN, Washington County, IN, Wayne County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Bath County, KY, Boone County, KY, Bourbon County, KY, Boyle County, KY, Bracken County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Campbell County, KY, Carroll County, KY, Casey County, KY, Christian County, KY, Clark County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Fayette County, KY, Fleming County, KY, Franklin County, KY, Gallatin County, KY, Garrard County, KY, Grant County, KY, Grayson County, KY, Green County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Hart County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Kenton County, KY, Larue County, KY, Lewis County, KY, Lincoln County, KY, Logan County, KY, Madison County, KY, Marion County, KY, Mason County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Montgomery County, KY, Muhlenberg County, KY, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Oldham County, KY, Owen County, KY, Pendleton County, KY, Robertson County, KY, Rowan County, KY, Russell County, KY, Scott County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Todd County, KY, Trimble County, KY, Warren County, KY, Washington County, KY, Woodford County, KY, Adams County, OH, Brown County, OH, Butler County, OH, Champaign County, OH, Clark County, OH, Clermont County, OH, Clinton County, OH, Darke County, OH, Fayette County, OH, Greene County, OH, Hamilton County, OH, Highland County, OH, Madison County, OH, Miami County, OH, Montgomery County, OH, Pickaway County, OH, Pike County, OH, Preble County, OH, Ross County, OH, Scioto County, OH, Shelby County, OH, Warren County, OH

The radar

The Cincinnati radar (KILN), 94 km from the middle of the area, began a volume at 23:35 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
20%
Ten or more severe wind reports
80%
One or more gusts of 65 knots or more
50%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
20%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 3, 7:30 PM EDTSevere Thunderstorm WarningLMKButler, Edmonson, Grayson, Ohio, Warren30 min
Apr 3, 7:36 PM EDTSevere Thunderstorm WarningLMKBreckinridge, Bullitt, Hardin, Meade, Nelson39 min
Apr 3, 7:43 PM EDTSevere Thunderstorm WarningPAHMuhlenberg17 min
Apr 3, 7:44 PM EDTSevere Thunderstorm WarningILNLewis, Mason46 min
Apr 3, 7:45 PM EDTSevere Thunderstorm WarningINDClay, Greene, Owen, Sullivan30 min
Apr 3, 7:46 PM EDTSevere Thunderstorm WarningLMKOhio18 min
Apr 3, 7:53 PM EDTSevere Thunderstorm WarningLMKClark37 min
Apr 3, 7:55 PM EDTSevere Thunderstorm WarningLMKGrayson, Hardin35 min
Apr 3, 7:57 PM EDTSevere Thunderstorm WarningLMKButler, Edmonson, Grayson, Hart, Warren33 min
Apr 3, 8:03 PM EDTSevere Thunderstorm WarningLMKBreckinridge, Grayson, Ohio27 min
Apr 3, 8:06 PM EDTSevere Thunderstorm WarningILNBoone, Campbell, Kenton24 min
Apr 3, 8:10 PM EDTSevere Thunderstorm WarningPAHTodd9 min
Apr 3, 8:12 PM EDTSevere Thunderstorm WarningLMKBullitt, Hardin, Nelson33 min
Apr 3, 8:17 PM EDTTornado WarningLMKHardin, Larue28 min
Apr 3, 8:21 PM EDTSevere Thunderstorm WarningLMKHenry, Trimble9 min
Apr 3, 8:28 PM EDTSevere Thunderstorm WarningINDHancock, Marion32 min
Apr 3, 8:28 PM EDTSevere Thunderstorm WarningLMKGreen, Hart, Larue32 min
Apr 3, 8:31 PM EDTSevere Thunderstorm WarningLMKLarue, Marion, Nelson, Washington29 min
Apr 3, 8:35 PM EDTTornado WarningLMKLarue, Marion, Nelson25 min
Apr 3, 8:36 PM EDTSevere Thunderstorm WarningLMKEdmonson, Hart, Warren24 min
Apr 3, 8:41 PM EDTTornado Warning Tornado observedLMKGreen, Hart19 min
Apr 3, 8:57 PM EDTSevere Thunderstorm WarningLMKBoyle, Casey, Garrard, Lincoln, Marion, Mercer and 1 more48 min
Apr 3, 8:59 PM EDTSevere Thunderstorm WarningLMKAdair, Casey, Edmonson, Green, Hart, Lincoln and 4 more46 min
Apr 3, 9:07 PM EDTTornado WarningLMKBoyle, Marion23 min
Apr 3, 9:07 PM EDTSevere Thunderstorm WarningPAHChristian, Todd23 min
Apr 3, 9:09 PM EDTSevere Thunderstorm WarningILNGrant, Owen16 min
Apr 3, 9:11 PM EDTTornado WarningLMKMarion, Taylor19 min
Apr 3, 9:14 PM EDTSevere Thunderstorm WarningLMKHarrison, Scott31 min
Apr 3, 9:20 PM EDTSevere Thunderstorm WarningLMKBreckinridge, Hancock25 min
Apr 3, 9:25 PM EDTTornado WarningLMKCasey, Marion, Taylor20 min
Apr 3, 9:31 PM EDTTornado WarningLMKBoyle, Garrard, Lincoln29 min
Apr 3, 9:37 PM EDTSevere Thunderstorm WarningLMKBourbon, Clark, Fayette, Jessamine23 min
Apr 3, 9:41 PM EDTSevere Thunderstorm WarningLMKBreckinridge, Grayson, Hardin21 min
Apr 3, 9:41 PM EDTTornado WarningLMKCasey, Garrard, Lincoln19 min
Apr 3, 9:46 PM EDTSevere Thunderstorm WarningLMKButler, Edmonson, Logan, Warren29 min
Apr 3, 9:47 PM EDTSevere Thunderstorm WarningLMKCasey, Lincoln28 min
Apr 3, 9:56 PM EDTSevere Thunderstorm WarningLMKClark, Madison49 min
Apr 3, 9:56 PM EDTTornado WarningLMKGarrard, Lincoln34 min
Apr 3, 9:59 PM EDTSevere Thunderstorm WarningLMKBourbon, Clark31 min
Apr 3, 10:04 PM EDTSevere Thunderstorm WarningLMKMadison26 min
Apr 3, 10:11 PM EDTSevere Thunderstorm WarningLMKLogan, Simpson34 min
Apr 3, 10:12 PM EDTSevere Thunderstorm WarningJKLBath, Estill, Lee, Menifee, Montgomery, Powell and 1 more48 min
Apr 3, 10:15 PM EDTSevere Thunderstorm WarningLMKLincoln30 min
Apr 3, 10:16 PM EDTTornado WarningLMKMadison14 min
Apr 3, 10:34 PM EDTSevere Thunderstorm WarningLMKAllen, Barren, Simpson, Warren26 min
Apr 3, 10:57 PM EDTSevere Thunderstorm WarningLMKAllen, Barren, Cumberland, Metcalfe, Monroe33 min
Apr 4, 12:09 AM EDTSevere Thunderstorm WarningLMKGarrard, Madison21 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 11.5 hours before the alert went out and 96 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, Cncnati-Daytn, OH at 12:00Z on 2018-04-03Temperature 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, Cncnati-Daytn, OH at 12:00Z on 2018-04-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 358 square meters per square second.19395878Sfc1 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
542 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
358 m²/s²
0-3 km storm-relative helicity
356 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

895 
WWUS20 KWNS 032328
SEL1  
SPC WW 032328
INZ000-KYZ000-OHZ000-040500-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 31
NWS Storm Prediction Center Norman OK
730 PM EDT Tue Apr 3 2018

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Central and southeast Indiana
  Central Kentucky
  Southwest Ohio

* Effective this Tuesday night and Wednesday morning from 730 PM
  until 100 AM EDT.

* Primary threats include...
  A few tornadoes possible
  Widespread damaging winds likely with isolated significant gusts
    to 75 mph possible
  Scattered large hail events to 1.5 inches in diameter possible

SUMMARY...Bands of strong-severe storms will continue to move across
Ohio, Kentucky, and Indiana into tonight, in advance of a cold front
moving eastward from Illinois.  A few tornadoes will be possible
with both pre-frontal supercells, as well as with circulations
embedded in what may become a more solid line later this evening. 
Otherwise, damaging winds and large hail can be expected with the
stronger storms.

The tornado watch area is approximately along and 80 statute miles
east and west of a line from 35 miles east northeast of Dayton OH to
20 miles south of Bowling Green KY. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU1).

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...This tornado watch replaces tornado
watch number 26. Watch number 26 will not be in effect after 730
PM EDT. CONTINUE...WW 27...WW 28...WW 29...WW 30...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1.5 inches. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 450. Mean
storm motion vector 26045.

...Thompson

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 2, 11:46 PM EDTMesoscale DiscussionSPCGibson, Pike, Posey119 min
Apr 3, 12:41 PM EDTMesoscale DiscussionSPCBartholomew, Blackford, Brown, Clark, Clay, Crawford and 46 more3 hr
Apr 3, 1:16 PM EDTTornado WatchSPCBartholomew, Boone, Brown, Clark, Clay, Crawford and 48 more6 hr
Apr 3, 1:57 PM EDTMesoscale DiscussionSPCPosey2 hr
Apr 3, 2:33 PM EDTTornado WatchSPCGibson, Pike, Posey, Spencer, Vanderburgh, Warrick7 hr
Apr 3, 4:18 PM EDTMesoscale DiscussionSPCClark, Dearborn, Decatur, Fayette, Floyd, Franklin and 9 more117 min
Apr 3, 4:34 PM EDTMesoscale DiscussionSPCPosey86 min
Apr 3, 6:38 PM EDTMesoscale DiscussionSPCBath, Bourbon, Boyd, Carter, Clark, Elliott and 12 more2 hr
Apr 3, 7:07 PM EDTSevere Thunderstorm WatchSPCBoyd, Carter, Greenup, Lawrence6 hr

Nearby

Tornado Watches in Kentucky, 2018Tornado Watches in Indiana, 2018Tornado Watches in Ohio, 2018Every tornado watch in 2018

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.