Alert archive / Kentucky / Tornado Watches in 2020

Tornado Watch 93

April 8, 20204 states

The Storm Prediction Center issued this tornado watch at Apr 8, 2020, 10:51 PM EDT for 4 states. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 8, 2020, 10:51 PM EDT (02:51 UTC)
Expired
Apr 9, 2020, 3:23 AM EDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 69 counties

Bath County, KY, Bell County, KY, Boyd County, KY, Breathitt County, KY, Carter County, KY, Clay County, KY, Elliott County, KY, Estill County, KY, Fleming County, KY, Floyd County, KY, Greenup County, KY, Harlan County, KY, Jackson County, KY, Johnson County, KY, Knott County, KY, Knox County, KY, Laurel County, KY, Lawrence County, KY, Lee County, KY, Leslie County, KY, Letcher County, KY, Magoffin County, KY, Martin County, KY, McCreary County, KY, Menifee County, KY, Montgomery County, KY, Morgan County, KY, Owsley County, KY, Perry County, KY, Pike County, KY, Powell County, KY, Pulaski County, KY, Rockcastle County, KY, Rowan County, KY, Wayne County, KY, Whitley County, KY, Wolfe County, KY, Athens County, OH, Gallia County, OH, Jackson County, OH, Lawrence County, OH, Meigs County, OH, Vinton County, OH, Buchanan County, VA, Dickenson County, VA, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Fayette County, WV, Gilmer County, WV, Jackson County, WV, Kanawha County, WV, Lincoln County, WV, Logan County, WV, Mason County, WV, McDowell County, WV, Mingo County, WV, Nicholas County, WV, Putnam County, WV, Raleigh County, WV, Ritchie County, WV, Roane County, WV, Wayne County, WV, Webster County, WV, Wirt County, WV, Wood County, WV, Wyoming County, WV

The radar

The Jackson,KY radar (KJKL), 11 km from the middle of the area, began a volume at 02:54 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
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
80%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
40%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 8, 11:18 PM EDTSevere Thunderstorm WarningJKLBath, Elliott, Fleming, Menifee, Montgomery, Morgan and 1 more57 min
Apr 8, 11:19 PM EDTSevere Thunderstorm WarningRLXGallia, Jackson, Lawrence, Vinton26 min
Apr 8, 11:28 PM EDTTornado WarningJKLFleming, Rowan32 min
Apr 8, 11:38 PM EDTSevere Thunderstorm WarningRLXJackson, Vinton52 min
Apr 8, 11:40 PM EDTSevere Thunderstorm WarningRLXGallia, Jackson, Meigs, Vinton50 min
Apr 8, 11:52 PM EDTSevere Thunderstorm WarningRLXBoyd, Carter, Greenup53 min
Apr 9, 12:06 AM EDTSevere Thunderstorm WarningJKLBath, Elliott, Fleming, Menifee, Montgomery, Morgan and 1 more39 min
Apr 9, 12:21 AM EDTSevere Thunderstorm WarningJKLClay, Estill, Jackson, Laurel, Lee, Owsley and 2 more39 min
Apr 9, 12:24 AM EDTSevere Thunderstorm WarningRLXAthens, Gallia, Jackson, Meigs, Vinton, Washington36 min
Apr 9, 12:28 AM EDTSevere Thunderstorm WarningRLXGallia32 min
Apr 9, 12:34 AM EDTSevere Thunderstorm WarningRLXBoyd, Lawrence41 min
Apr 9, 12:41 AM EDTSevere Thunderstorm WarningRLXBoone, Cabell, Clay, Fayette, Jackson, Kanawha and 4 more49 min
Apr 9, 12:54 AM EDTSevere Thunderstorm WarningRLXAthens, Meigs, Washington51 min
Apr 9, 12:56 AM EDTSevere Thunderstorm WarningJKLBreathitt, Clay, Estill, Jackson, Laurel, Lee and 2 more34 min
Apr 9, 1:18 AM EDTSevere Thunderstorm WarningJKLBreathitt, Floyd, Knott, Letcher, Magoffin, Martin and 2 more42 min
Apr 9, 1:23 AM EDTSevere Thunderstorm WarningRLXBoone, Braxton, Calhoun, Clay, Fayette, Gilmer and 7 more52 min
Apr 9, 1:36 AM EDTSevere Thunderstorm WarningRLXBraxton, Calhoun, Doddridge, Gilmer, Lewis, Ritchie and 3 more39 min
Apr 9, 1:52 AM EDTSevere Thunderstorm WarningJKLFloyd, Harlan, Knott, Leslie, Letcher, Perry and 1 more23 min
Apr 9, 2:04 AM EDTSevere Thunderstorm WarningRLXBarbour, Braxton, Clay, Lewis, Nicholas, Pocahontas and 3 more56 min
Apr 9, 2:11 AM EDTSevere Thunderstorm WarningRLXFayette, Raleigh38 min
Apr 9, 2:14 AM EDTSevere Thunderstorm WarningJKLHarlan, Letcher, Perry16 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 00:00Z, 2.9 hours before the alert went out and 207 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 00:00Z on 2020-04-09Temperature 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 00:00Z on 2020-04-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 128 square meters per square second.1939587897117Sfc1 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
2413 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
128 m²/s²
0-3 km storm-relative helicity
295 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

164 
WWUS20 KWNS 090247
SEL3  
SPC WW 090247
KYZ000-OHZ000-VAZ000-WVZ000-090800-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 93
NWS Storm Prediction Center Norman OK
1050 PM EDT Wed Apr 8 2020

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Eastern Kentucky
  Southeast Ohio
  Extreme Southwest Virginia
  Central and Southern West Virginia

* Effective this Wednesday night and Thursday morning from 1050
  PM until 400 AM EDT.

* Primary threats include...
  A couple tornadoes possible
  Widespread damaging wind gusts to 70 mph likely
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible

SUMMARY...A fast-moving squall line over Kentucky and Ohio will race
across the watch area overnight, posing a risk of damaging winds and
some hail.  A few storms in this area could also produce brief
tornadoes.

The tornado watch area is approximately along and 70 statute miles
east and west of a line from 35 miles south southeast of London KY
to 55 miles north of Charleston WV. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU3).

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 90...WW 91...WW 92...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean
storm motion vector 28035.

...Hart

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 8, 8:46 PM EDTMesoscale DiscussionSPCAnderson, Ballard, Boone, Bourbon, Boyle, Bracken and 61 more119 min
Apr 8, 10:14 PM EDTMesoscale DiscussionSPCBath, Boyd, Breathitt, Carter, Clay, Elliott and 30 more3 hr
Apr 8, 11:16 PM EDTSevere Thunderstorm WatchSPCLee, Russell, Scott, Washington, Wise, City of Bristol and 1 more6 hr
Apr 9, 12:50 AM EDTMesoscale DiscussionSPCAlleghany, Bath, Bland, Craig, Giles, Highland and 7 more115 min
Apr 9, 2:03 AM EDTSevere Thunderstorm WatchSPCAlbemarle, Alleghany, Amherst, Augusta, Bath, Bedford and 37 more3 hr
Apr 9, 3:36 AM EDTMesoscale DiscussionSPCAlbemarle, Alleghany, Amherst, Augusta, Bath, Bedford and 40 more84 min
Apr 9, 12:01 PM EDTSevere Thunderstorm WatchSPCArlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church4 hr

Nearby

Tornado Watches in Kentucky, 2020Tornado Watches in West Virginia, 2020Tornado Watches in Ohio, 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.