Special Weather Statement, NWS Jackson, KY

AREA FORECAST DISCUSSION
National Weather Service Jackson KY
301 PM EDT Mon Aug 9 2021

.UPDATE...
Issued at 230 PM EDT MON AUG 9 2021

Did a quick update to the grids on account of the storms to the
west not fading out as implied by the last few runs of the HRRR.
They seem to have formed a cold pool and are now expected to
progress southeast through much of the CWA into late afternoon.
The grids have been updated with these thoughts in mind as well as
the inclusion of the latest T/Td obs and trends. These updates
have been sent to the NDFD and web servers.

UPDATE Issued at 1051 AM EDT MON AUG 9 2021

A few showers have popped up out ahead of the main convection
attempting to move more into central Kentucky. Have freshened up
the PoPs through this afternoon, still maintaining likely across
the western third to half of the forecast area, where better
moisture advection and instability will reside. Clouds may hamper
some of the high temperatures, but will sit on the forecast highs
for now and mainly update the near term hourly trends. Updates
have been sent.

UPDATE Issued at 810 AM EDT MON AUG 9 2021

Did slow down the PoPs just a bit based on upstream radar trends.
Patchy river valley fog will be mixing out through 9 am.
Otherwise, freshened up the hourly temperatures and dew points,
incorporating the latest trends in the observations.

&&

.SHORT TERM...(Today through Tuesday)
Issued at 447 AM EDT MON AUG 9 2021

The latest upper level map features short wave ridging from the
eastern Great Lakes down through the southern Appalachians. An
upper level low is currently spiraling across the MN/WI border,
with troughing extending south along the Mississippi Valley.
Upstream of these features, short wave ridging is aligned across
the Plains, with a deeper upper level low rotating across the
northern Rockies. Meanwhile, broad ridging remains sprawled from
the western Atlantic through Gulf of Mexico and across the
southern CONUS. At the surface, moderate high pressure controls
from the Mid-Atlantic region through the northern Gulf Coast. A
weaker frontal system is skirting the northern Great Lakes, with
a stronger system occupying from the northern Plains through the
central Rockies/Great Basin region. Ongoing moisture advection
along with a passing short wave trough has allowed for more
sustained convection across portions of the Ohio Valley overnight.
This convection has weakened as it has headed east, with weaker
instability and drier mid-level air still in place across the
eastern portions of the Commonwealth. Temperatures currently range
from the mid to upper 60s in the valleys, to the lower 70s on the
ridgetops. River valley fog is also occurring, although not as
extensive compared to last night at this time.

The models are in fairly good agreement aloft through the short
term, with passing short wave energy generally dampening with time
as it moves east and northeast across the northern half of the
CONUS. This occurs in response to increased ridging across the
southern CONUS, as higher heights expand to the north with time.
This will result in increasing heat, humidity, and thunderstorm
chances across the Ohio and Tennessee valleys, as low level flow
remains out of the southwest. Mainly weaker synoptics are expected
across our region, with mesoscale features more likely to
dominate. As such, have relied more so on model output from the
CAMs. Still, agreement is not great within this suite of guidance,
so will maintain fairly good continuity from the previous
forecast, while taking into account the latest data.

PWATs will notably increase across our area today from the west,
with 1.75"+ advecting in during the day. Heating, combined with
the approach of a dampening short wave trough will allow for
scattered to numerous convection across eastern Kentucky today.
While a stronger storm cannot be ruled out across most areas, the
better chance of this will generally occur west of I-75, where
peak MU CAPE will be in the 2000-2500 J/kg range. Storm motions
are more progressive in this regime, generally 10-20 kts, so heavy
rainers should not linger too long over a given location. Highs
today will range from the mid to upper 80s, with a few spots
possibly touching 90. This would occur across our far east, where
thicker cloud cover will hold off the longest.

Storms will gradually diminish into this evening with the loss of
heating; however, another uptick in activity will likely occur
during the pre-dawn hours, as another increase in moisture
advection combines with the approach of another more modest short
wave trough as it moves across the Ohio Valley. This activity will
push east across the area Tuesday morning, before additional
scattered storms fire off in the afternoon as we heat up in a
still weakly capped environment. There should be less organization
to these cells; however, the instability looks to be more robust
Tuesday afternoon, with MU CAPE values of greater than 2500 J/kg
potentially, so some strong to damaging wind gusts will be
possible in the stronger storms. Highs on Tuesday will be similar
to perhaps a degree warmer in places, generally in the upper 80s,
with a few 90 degree readings achievable, given the increasing
heights across the region.

.LONG TERM...(Wednesday through Monday)
Issued at 301 PM EDT MON AUG 9 2021

The first part of the period will feature summer pattern with hot
and muggy conditions expected. This as dome of ridging sets up in
the southern parts of the lower 48 and any upper level troughs
becoming more subtle. However, given the flatter pattern overall
in the Ohio Valley expect weaker embedded shortwaves to lead to a
fairly active pattern across the Lower Ohio Valley. These bouts of
showers and thunderstorms will be most prevalent in the afternoon
and evening hours when instability from daytime heating is
maximized. The greatest threat for stronger storms looks to be
Thursday and Friday given approaching cold front and high
instability. However, isolated strong storm threat still possible
Wednesday and daily chances of heavier rain through Friday given
the PWATs climb closer to nearly 2 inches for some locations and
slow storm motions. The warm air will be noticeable with the muggy
conditions, as highs soar into the upper 80s to lower 90s through
Friday. The overnight lows will be quite warm, with some nights
getting close to maximum min records.

This weekend has been a bit more volatile in the guidance suites,
with what looks like a better consensus on a cold front settling
south and becoming more stationary across the Lower Ohio Valley
and Tennessee Valley. This would bring some drier air and cooler
temperatures for the weekend into early next week, but not as dry
as you might want given the lack of better frontal push. This
boundary would also be the anchor for afternoon convection in
parts of southeast Kentucky through the weekend if it sticks
around. Given the uncertainty in these previously mentioned items
and the various guidance suites backing off the idea of the front
making it south will lean close to the NBM for this part of the
period. Afternoon highs are expected to stay in the low to mid 80s
and afternoon dewpoints in the mid to upper 60s will provide some
relief.

&&

.AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon)
ISSUED AT 200 PM EDT MON AUG 9 2021

Convection this afternoon is now the main concern with a self-
sustaining cluster of storms expected to affect most of the TAF
sites through 00Z. Accordingly, have maintained VCTS through then
with a tempo for worse prevailing conditions at all sites mainly
from 18-22Z. Otherwise, VFR conditions will prevail through the
majority of the forecast; however, any locations that see a
direct impact from thunderstorms will see temporary IFR or worse
conditions, along with gusty winds of up to 30 kts. Convection is
expected to generally diminish by sunset, before upticking once
again towards dawn Tuesday. Fog will likely be at a minimum for
most of the night - to MVFR at worst - dependent on any clearing
of the clouds. Winds will be out of the south and southwest at 5
to 10 kts through the early evening, before diminishing towards
dusk.

&&

.JKL WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

UPDATE...GREIF
SHORT TERM...GEOGERIAN
LONG TERM...DJ
AVIATION...GEOGERIAN/GREIF

Hazardous Weather Outlook...UPDATED
National Weather Service Jackson KY
410 PM EDT Mon Aug 9 2021

KYZ044-050>052-058>060-068-069-079-080-083>088-104-106>120-102315-
Fleming-Montgomery-Bath-Rowan-Estill-Powell-Menifee-Rockcastle-
Jackson-Pulaski-Laurel-Wayne-McCreary-Whitley-Knox-Bell-Harlan-
Elliott-Morgan-Johnson-Wolfe-Magoffin-Floyd-Lee-Breathitt-Knott-
Owsley-Perry-Clay-Leslie-Letcher-Martin-Pike-
Including the cities of Flemingsburg, Camargo, Jeffersonville,
Mount Sterling, Owingsville, Morehead, Irvine, Ravenna,
Clay City, Stanton, Frenchburg, Brodhead, Mount Vernon, McKee,
Annville, Burnside, Somerset, London, Monticello, Stearns,
Whitley City, Corbin, Williamsburg, Barbourville, Middlesboro,
Pineville, Cumberland, Harlan, Sandy Hook, West Liberty,
Paintsville, Campton, Salyersville, Prestonsburg, Wheelwright,
Beattyville, Jackson, Hindman, Pippa Passes, Booneville, Hazard,
Manchester, Hyden, Jenkins, Whitesburg, Inez, Coal Run,
Elkhorn City, Pikeville, and South Williamson
410 PM EDT Mon Aug 9 2021

This hazardous weather outlook is for portions of eastern Kentucky.

.DAY ONE...Tonight.

Scattered to numerous thunderstorms will continue into the
evening. Some of the storms could be strong with gusty winds and
heavy rainfall.

There is also a small chance of a storm through the rest of the
night.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Thunderstorms are possible at times through the period. Some of
the stronger storms will be capable of producing gusty winds and
torrential downpours through Friday. Isolated cases of wind damage
and high water will be possible.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report thunderstorm wind damage and
flooding to the National Weather Service.

GREIF/DJ

Special Weather Statement
National Weather Service JACKSON KY
315 PM EDT Mon Aug 9 2021

KYZ079-080-083>085-092000-
McCreary KY-Whitley KY-Wayne KY-Laurel KY-Pulaski KY-
315 PM EDT Mon Aug 9 2021

...A strong thunderstorm will impact portions of eastern Wayne,
southwestern Laurel, southeastern Pulaski, McCreary and Whitley
Counties through 400 PM EDT...

At 315 PM EDT, Doppler radar was tracking a strong thunderstorm over
Ritner, or 10 miles east of Monticello, moving east at 35 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This strong thunderstorm will be near...
  Wiborg, Greenwood, Marshes Siding, Stearns and Alpine around 330
  PM EDT.
  Whitley City, Beulah Heights and Parkers Lake around 335 PM EDT.

Other locations in the path of this storm include Cumberland Falls
S.P., Honeybee, Duckrun, Bounty, Youngs Creek, Krupp, Redbird, Bark
Camp, Williamsburg, Walden, Clio, Deering, Goldbug, Rockholds, Faber,
Wofford, Rye and Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3660 8457 3660 8474 3697 8477 3709 8406
      3697 8406 3697 8407 3695 8410 3693 8408
      3690 8408 3689 8407 3685 8406 3685 8405
      3659 8404
TIME...MOT...LOC 1915Z 263DEG 31KT 3679 8466

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

GREIF

Special Weather Statement
National Weather Service JACKSON KY
329 PM EDT Mon Aug 9 2021

KYZ069-080-108-109-111>116-092015-
Jackson KY-Lee KY-Clay KY-Breathitt KY-Perry KY-Knott KY-Owsley KY-
Magoffin KY-Wolfe KY-Laurel KY-
329 PM EDT Mon Aug 9 2021

...A strong thunderstorm will impact portions of northeastern Laurel,
Owsley, northern Perry, eastern Jackson, northwestern Knott,
Breathitt, Magoffin, Lee, southern Wolfe and northern Clay Counties
through 415 PM EDT...

At 329 PM EDT, Doppler radar was tracking a strong thunderstorm over
Levi, or over Booneville, moving east at 30 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This strong thunderstorm will be near...
  Stay, Grass, Eversole and Ricetown around 335 PM EDT.
  Lerose, Lone, Cowcreek, St. Helens, Airedale and Arnett around 340
  PM EDT.
  Jetts Creek, Athol, Tallega, Canyon Falls, Monica, Primrose,
  Williba and Vada around 345 PM EDT.

Other locations in the path of this storm include Copebranch,
Guerrant, Oakdale, Turkey, Houston, Fillmore, Widecreek, Chenowee,
Yeadon, War Creek, Canoe, Sebastian's Branch, Talbert, Pence,
Elkatawa, Gentry, Curt, Frozen Creek, Lawson, Jackson, Inverness,
Dumont, Haddix, Fivemile, Howard Creek, Copland, Sewell, Saldee,
Vancleve, Noctor, Portsmouth, Quicksand, Smith Branch, Keck, Lost
Creek, Flintville, Clayhole, Taulbee and Watts.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3720 8416 3756 8393 3754 8391 3762 8387
      3764 8381 3766 8382 3771 8375 3772 8371
      3774 8369 3775 8331 3771 8326 3775 8324
      3775 8295 3767 8294 3763 8290 3733 8294
      3729 8336 3732 8340 3727 8349
TIME...MOT...LOC 1929Z 259DEG 28KT 3749 8371

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

GREIF

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSON KY
337 PM EDT MON AUG 9 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0350 PM     TSTM WND DMG     1 W GATUN               36.87N 83.32W
08/07/2021                   HARLAN             KY   DEPT OF HIGHWAYS

            TREE DOWN ON HIGHWAY 421 AT MILE MARKER
            18.5.

&&

CARICO

Special Weather Statement
National Weather Service JACKSON KY
337 PM EDT Mon Aug 9 2021

KYZ080-086-116-117-092015-
Clay KY-Knox KY-Laurel KY-Leslie KY-
337 PM EDT Mon Aug 9 2021

...A strong thunderstorm will impact portions of Laurel, northern
Knox, southwestern Leslie and Clay Counties through 415 PM EDT...

At 336 PM EDT, Doppler radar was tracking a strong thunderstorm over
London, moving east at 30 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

This strong thunderstorm will be near...
  Levi Jackson S.P. around 340 PM EDT.
  Maplesville and Lesbas around 345 PM EDT.
  Deer Lick, Langnau, Crawford and Tuttle around 350 PM EDT.
  Marydell, Portersburg, Lida, Sasser, Cane Creek, Blackwater,
  Fogertown, Benge and Gibbs around 355 PM EDT.

Other locations in the path of this storm include Urban, Byron,
Bush, Lake, Grace, Tedders, Pigeonroost, Sidell, Cottongin, Woollum,
Manchester, Horse Creek Junction, Sibert, Hima, Herron, Littleton,
Bluehole, House, Park Valley, Jonsee, Boho, Goose Rock, Hector,
Botto, Bernice, Tanksley, Plank, Mill Pond, Wild Cat and Spurlock.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3696 8422 3694 8423 3695 8426 3721 8418
      3728 8357 3726 8351 3724 8350 3725 8349
      3695 8331 3694 8354 3695 8359 3694 8358
      3694 8409 3697 8412 3696 8414 3697 8415
      3694 8416
TIME...MOT...LOC 1936Z 267DEG 27KT 3713 8409

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

GREIF

Special Weather Statement
National Weather Service JACKSON KY
350 PM EDT Mon Aug 9 2021

KYZ079-080-083>086-092030-
McCreary KY-Whitley KY-Knox KY-Wayne KY-Laurel KY-Pulaski KY-
350 PM EDT Mon Aug 9 2021

...A strong thunderstorm will impact portions of northeastern Wayne,
southwestern Laurel, west central Knox, southeastern Pulaski, central
McCreary and northwestern Whitley Counties through 430 PM EDT...

At 349 PM EDT, Doppler radar was tracking a strong thunderstorm near
Huxley, or 14 miles north of Whitley City, moving east at 50 mph.

HAZARD...Wind gusts up to 50 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This strong thunderstorm will be near...
  Bark Camp, Baldrock, Youngs Creek and Rockcastle Springs around
  355 PM EDT.
  Grove, Rye, Vox, Holly Bay Rec. Area, Deering and Walden around
  400 PM EDT.
  Barton, North Corbin, Keavy, Woodbine, Hightop and Faber around
  405 PM EDT.

Other locations in the path of this storm include Dorthae, Moore
Hill, Lily, Wilton, Fariston, London-Corbin Airport, Lynn Camp,
McHargue, Gray, Bertha Station, Rossland and Levi Jackson S.P..

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3667 8457 3709 8473 3718 8404 3683 8396
TIME...MOT...LOC 1949Z 257DEG 46KT 3692 8438

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...50 MPH

GREIF

Special Weather Statement
National Weather Service JACKSON KY
426 PM EDT Mon Aug 9 2021

KYZ080-085-086-092115-
Whitley KY-Knox KY-Laurel KY-
426 PM EDT Mon Aug 9 2021

...A strong thunderstorm will impact portions of southern Laurel,
Knox and Whitley Counties through 515 PM EDT...

At 426 PM EDT, Doppler radar was tracking a strong thunderstorm over
Redbird, or near Williamsburg, moving east at 15 mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This strong thunderstorm will be near...
  Goldbug, Bon and Walden around 435 PM EDT.
  Williamsburg around 440 PM EDT.
  Wofford, Rockholds, Emlyn, Pleasant View and Faber around 445 PM
  EDT.

Other locations in the path of this storm include Suttons Mill,
Mountain Ash, Yaden, Perkins, Julip, Lucky, Verne, Dixie, Nevisdale,
Packard, Polly Camp, Louden and Gatliff.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3662 8425 3668 8431 3681 8436 3683 8432
      3684 8434 3694 8430 3694 8436 3699 8435
      3700 8431 3702 8433 3704 8430 3707 8432
      3710 8428 3714 8429 3708 8388 3707 8389
      3703 8380 3671 8384 3665 8395 3661 8393
TIME...MOT...LOC 2026Z 273DEG 13KT 3677 8422

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

GREIF