Special Weather Statement, NWS Paducah, KY

Area Forecast Discussion
National Weather Service Paducah KY
1226 AM CDT Tue May 4 2021

.UPDATE...
Issued at 1226 AM CDT Tue May 4 2021

Updated Aviation discussion for the 06z TAF issuance.

&&

.SHORT TERM...(Tonight through Tuesday night)
Issued at 323 PM CDT Mon May 3 2021

Complex convective forecast late this afternoon through Tuesday,
but the main concern continues to be late tonight. Forecast
confidence starts off low and dwindles with time.

Satellite is showing some vertical development to the cu field
from the Purchase Area westward into southeast Missouri along a
significant surface moisture gradient, and also to the west of
KSTL near a surface boundary just ahead of the cold front. We
will have to be alert for possible isolated to scattered
development in the southern cu field and also near the cold front
as it approaches our northwest periphery around midnight. The
HRRR and many other CAMs continue to push a strong bowing line
northeast across our region overnight toward 12Z, generally along
and south of the cold front and any outflows from earlier
convection.

The latest trends in the HRRR are not very bullish for convection
this afternoon and evening, but a few strong to severe storms will
be possible given the instability and increasing shear across the
region. SPC's mesoanalysis indicates 1000-2500 J/kg of SBCAPE,
effective Bulk Shear of 35-45kts, and effective SRH of 100+m2/s2.
Not sure if we could get supercells, but some level of
organization is likely if any storms can get going through early
evening. Large hail and localized damaging winds would be the main
concerns with any early evening convection.

There is some increase in potential for convection to develop
along the cold front later this evening. Any convection late this
evening, whether off the cold front, or left over diurnal
convection, would tend to become linear and dive southeast across
the area. Damaging winds would be the primary threat, but locally
heavy rainfall may be the bigger concern with this potential
scenario, especially as it loses steam over west Kentucky.

The overnight bow echo potential will be most impactful if we
don't get any significant convection in the meantime. The portion
of the area that could be effected will be limited by the cold
frontal position and any outflow boundaries. Southern portions of
southeast Missouri and the Purchase Area are the most likely areas
to experience the damaging wind potential late tonight toward
daybreak Tuesday. Tornadoes would also be possible if the bowing
line reaches our region. Another concern is the very fast movement
of the bow, as seen in the CAMs.

As for Tuesday, forecast confidence is very low given uncertainties
in boundary locations and thermodynamic and shear profiles after
tonight's convection plays out. We could see some lingering
showers/storms in the morning over the northeast half of the area,
but any regeneration may be hard to get. However, if we get any
sunshine ahead of the cold front, a few strong storms would be
possible in the afternoon, mainly over west Kentucky. Severe
weather cannot be ruled out, but until the dust settles on
tonight's event it will be very difficult to pin down. With each
round of convection that actually occurs, the flash flood
potential will increase, but it does not look overly concerning at
this time, especially given all of the uncertainty.

The front should be east of the area by 00Z Wednesday and the
upper system should push any lingering convection east of the area
well before 12Z Wednesday.

.LONG TERM...(Wednesday through Monday)
Issued at 323 PM CDT Mon May 3 2021

A typical springtime pattern will continue into early next week. A
series of frontal passages will bring periodic rain chances, along
with noticeably large temperature swings.

On Wednesday, surface high pressure will bring cooler and drier
weather in the wake of tonight and Tuesday's wet weather system.
High temperatures will be only in the 60s despite abundant sunshine.
Overnight lows will be in the 40s.

Thursday will be a cooler and cloudier day, with possibly some light
showers. A deep closed 500 mb low over the southern end of Hudson
Bay will expand southward as a shortwave trough rotates southeast.
This will result in a reinforcing surface cold front or trough
passing across our region. The rumble of thunder cannot be ruled out
under a 500 mb thermal trough with temps below minus 20. High temps
will be only in the lower to mid 60s.

Friday will be a sunnier day as 500 mb heights increase and a weak
surface ridge passes by. Highs will be in the upper 60s.

The weekend looks unsettled as warmer and more humid air attempts to
return northward. Despite a weak, broad 500 mb ridge overhead, there
is a good chance of showers as moderately strong warm advection
begins on Saturday and continues Sunday. A surface warm front is
likely to extend eastward into our region from low pressure over the
southern Plains. Thunderstorms will gradually become more likely as
the warmer and more humid air arrives. Highs will be in the 70s both
days, with overnight lows around 60. Little change is expected on
Monday as the surface warm front stalls somewhere over our region.

&&

.AVIATION...
Issued at 1226 AM CDT Tue May 4 2021

Thunderstorms increased considerably across western Kentucky
during the midnight hour and expect scattered to numerous
thunderstorms to continue in the vicinity of KOWB and KPAH
through the late night. In the meantime expect large area of
thunderstorms over AR and South Central/South West MO to continue
progressing NE toward KCGI, KPAH and eventually the remaining TAF
sites overnight. It still appears the heaviest TSRA activity will
be at KCGI and KPAH. Thunder chances will end from west to east
around 12-15z, though kept vicinity showers going through most if
not all the remainder of the forecast period.

Cigs will lower to MVFR under rain shower activity. After the
steady rain ends, cigs will remain in the low MVFR range or
deteriorate further to IFR levels depending on location. Vsbys
will be VFR, except under heavy thunderstorm activity, when brief
drops to IFR are possible. Winds will be SW at 5-10 kts outside of
thunderstorms overnight, becoming W-NW Tuesday afternoon behind a
passing cold front.

&&

.PAH WATCHES/WARNINGS/ADVISORIES...
IL...None.
MO...None.
IN...None.
KY...None.
&&

UPDATE...DWS
SHORT TERM...DRS
LONG TERM...MY
AVIATION...RS

Hazardous Weather Outlook
National Weather Service Paducah KY
936 PM CDT Mon May 3 2021

ILZ075>078-080>094-INZ081-082-085>088-KYZ001>022-MOZ076-086-087-
100-107>112-114-050245-
Jefferson-Wayne IL-Edwards-Wabash-Perry IL-Franklin-Hamilton-
White-Jackson-Williamson-Saline-Gallatin-Union-Johnson-Pope-
Hardin-Alexander-Pulaski-Massac-Gibson-Pike-Posey-Vanderburgh-
Warrick-Spencer-Fulton-Hickman-Carlisle-Ballard-McCracken-Graves-
Livingston-Marshall-Calloway-Crittenden-Lyon-Trigg-Caldwell-
Union KY-Webster-Hopkins-Christian-Henderson-Daviess-McLean-
Muhlenberg-Todd-Perry MO-Bollinger-Cape Girardeau-Wayne MO-Carter-
Ripley-Butler-Stoddard-Scott-Mississippi-New Madrid-
936 PM CDT Mon May 3 2021

This Hazardous Weather Outlook is for portions of southern
Illinois, southwest Indiana, western Kentucky, and southeast
Missouri.

.DAY ONE...Tonight

Thunderstorm chances will be increasing through the late night
and early morning hours. Severe storms with large hail and
damaging winds will be possible over most of the region. The
greatest concern is for more widespread damaging wind after
midnight mainly over southeast Missouri and west Kentucky. Some
flooding problems may develop, especially in areas that receive
multiple rounds of thunderstorms.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

A good chance of thunderstorms continues Tuesday through Tuesday
evening. A few strong to severe storms cannot be ruled out mainly
over west Kentucky and southwest Indiana in the afternoon. Locally
heavy rainfall could lead to a few flooding problems, especially
in areas that receive heavy rainfall tonight.

A few thunderstorms are possible Thursday afternoon and again
Saturday afternoon through Sunday. Severe storms are not expected
at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will likely be needed by around midnight over
the Ozark Foot Hills of southeast Missouri, and elsewhere across
southeast Missouri and far western Kentucky and far southern
Illinois late tonight.

Shanklin

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PADUCAH KY
233 AM CDT TUE MAY 4 2021

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

0210 AM     TSTM WND DMG     DONIPHAN                36.62N 90.82W
05/04/2021                   RIPLEY             MO   EMERGENCY MNGR

            PLENTY OF TREE DAMAGE, POWER OUTAGES.
            HIGHEST MEASURED GUST 55 MPH.

&&

ATL

Special Weather Statement
National Weather Service Paducah KY
241 AM CDT Tue May 4 2021

ILZ090-092-094-KYZ003>008-010-011-013-016-040845-
Massac IL-Pope IL-Alexander IL-Carlisle KY-McCracken KY-Caldwell KY-
Hopkins KY-Marshall KY-Ballard KY-Graves KY-Crittenden KY-Lyon KY-
Livingston KY-
241 AM CDT Tue May 4 2021

...Strong Thunderstorms moving northeast across western Kentucky...

At 240 AM CDT, Doppler radar was tracking numerous strong
thunderstorms from near Bardwell and Reidland east toward Eddyville
and Princeton, moving northeast at 40 mph.

Pea size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Paducah, Metropolis, Princeton, Cairo, Calvert City, Eddyville, La
Center, Bardwell, Wickliffe, Reidland, Lone Oak, Brookport, Barlow,
Barkley Regional Airport, Olney, Ledbetter, Lovelaceville,
Farmersville, West Paducah and Kuttawa.

A Severe Thunderstorm Watch remains in effect until 800 AM CDT for
southern Illinois...western and northwestern Kentucky...and
southeastern Missouri.

LAT...LON 3694 8910 3697 8910 3698 8912 3697 8917
      3698 8919 3707 8917 3712 8911 3716 8909
      3720 8905 3727 8776 3702 8772 3690 8876
      3687 8912
TIME...MOT...LOC 0738Z 219DEG 36KT 3687 8894

RLS

Special Weather Statement
National Weather Service Paducah KY
251 AM CDT Tue May 4 2021

KYZ012-013-016-017-021-022-040900-
Muhlenberg KY-Todd KY-Christian KY-Caldwell KY-Hopkins KY-Trigg KY-
251 AM CDT Tue May 4 2021

...SIGNIFICANT WEATHER ADVISORY FOR MUHLENBERG...NORTHERN
CHRISTIAN...EAST CENTRAL CALDWELL...NORTHEASTERN TRIGG...SOUTHEASTERN
HOPKINS AND NORTHERN TODD COUNTIES UNTIL 400 AM CDT...

At 250 AM CDT, Doppler radar was tracking an area of strong
thunderstorms from near Dawson Springs and Crofton to near
Greenville, moving east at 35 mph.

Half inch hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Central City, Dawson Springs, Nortonville, Mortons Gap, Crofton,
Powderly, Graham, Greenville, Weir, Dunmor, White Plains,
Drakesboro, St. Charles, Hawkins and Clifty.

A Severe Thunderstorm Watch remains in effect until 800 AM CDT for
western, south central and northwestern Kentucky.

LAT...LON 3711 8691 3709 8690 3707 8695 3706 8705
      3696 8705 3685 8769 3719 8779 3733 8700
      3727 8698 3724 8694 3723 8691 3722 8691
      3721 8690 3719 8691 3718 8689 3718 8692
      3714 8693 3711 8689
TIME...MOT...LOC 0748Z 263DEG 14KT 3706 8730

RLS

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Special Weather Statement
National Weather Service Paducah KY
322 AM CDT Tue May 4 2021

ILZ088>091-093-094-KYZ004-005-007-010-013-015-016-040915-
Massac IL-Pope IL-Union IL-Johnson IL-Hardin IL-Pulaski IL-
McCracken KY-Webster KY-Caldwell KY-Hopkins KY-Ballard KY-
Crittenden KY-Livingston KY-
322 AM CDT Tue May 4 2021

...Strong Thunderstorms continue to move northeast across western
Kentucky and far southern Illinois...

At 320 AM CDT, Doppler radar was tracking an area of strong
thunderstorms from Bardwell and Paducah to north of Smithland to
around Fredonia. The storms were moving north at 35 mph. Hail up to
1/2 inch in diameter was observed at the National Weather Service in
Paducah at 3:15am.

Half inch hail and winds in excess of 30 mph will continue to be
possible with these storms.

Locations impacted include...
Metropolis, Providence, Marion, Clay, Rosiclare, Brookport, Salem,
Golconda, Mound City, Karnak, Olney, Burna, Creswell, New Columbia,
Farmersville, Dixon Springs, Joy, Fredonia, Joppa and Olmsted.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with some of these storms, and
may lead to localized flooding. Do not drive your vehicle through
flooded roadways.

&&

A Severe Thunderstorm Watch remains in effect until 800 AM CDT for
southern Illinois...and western and northwestern Kentucky.

LAT...LON 3708 8919 3740 8905 3748 8770 3721 8771
      3707 8918
TIME...MOT...LOC 0816Z 186DEG 29KT 3715 8858

RLS