Severe Thunderstorm Warning 2, NWS Paducah, KY

Area Forecast Discussion
National Weather Service Paducah KY
643 PM CST Tue Feb 7 2017

.UPDATE...
Issued at 643 PM CST Tue Feb 7 2017

Updated aviation discussion.

&&

.SHORT TERM...(Tonight through Thursday night)
Issued at 235 PM CST Tue Feb 7 2017

In the near term, the main focus is on the cold front that
extended from kmvn to 20 mi west of kpof at 19z. Latest 1930z
visible satellite images indicated a line of developing cumulus
along the front from kmvn to north of kpof. As previously noted,
deep-layer drying in the wake of a mid-level shortwave trough has
inhibited growth of updrafts. The 17z rap model soundings
indicated the leading edge of dry air will remain just ahead of
the front as it reaches the Lower Ohio Valley early this evening.
Any convective development would be confined to the deeper
moisture ahead of the front. The hrrr model has been indicating
some convective cells will develop over the Pennyrile region of
west Kentucky after 21z. Will keep chance pops in the forecast
through early this evening, mainly east of a line from the Wabash
River to kpah. Cold mid-level temps and moderate shear could
result in a few strong cells, but the overall severe threat has
become very minimal.

Once the front moves east of our region this evening, colder north
winds will lower temps into the 30s and 40s by morning. Areas of
post-frontal stratocu are depicted by the model low-level rh
forecasts late tonight.

On Wednesday, a 500 mb impulse will move southeast from the
central Plains. There is good model agreement that this system
will produce some light qpf across parts of our region. GFS
ensemble mean qpf is representative of the 12z model blend, which
targets areas north and east of kpah for light precip. The precip
type will be rain due to warm boundary layer temps, however any
precip that lingers into Wed evening could be wet snow. Highs Wed
will vary widely, from the lower 40s along I-64 to the mid 50s
along the Tennessee border.

A shot of cold air will arrive Wed night, with 850 mb temps
falling to around minus 10 on Thursday. Despite abundant sunshine
associated with a strong surface high, temps will only reach the
30s (except for some lower 40s in the Ozark foothills). As the
strong surface high moves to our east Thursday night, winds will
become southeast. Forecast lows are in the 20s, but a slightly
slower movement of the surface high would bring calm winds and
lows in the teens.

.LONG TERM...(Friday through Tuesday)
Issued at 235 PM CST Tue Feb 7 2017

High pressure will be centered over the southeast U.S. on Friday.
This will keep our region in south to southwest flow Friday into
Saturday night.  This will result in well above normal temperatures
through the weekend, with our warmest day on Saturday with highs in
the 60s.  Models indicate warm air advection ahead of an approaching
cold front will trigger some showers across our region Saturday into
Saturday night, with the better chances across southwest Indiana and
west Kentucky.

Models bring the cold front across the PAH forecast area on Sunday,
and precipitation chances will be more uniform across the area
Sunday afternoon, gradually tapering off from northwest to southeast
Sunday night.  A few showers may linger in our far southeast
counties Monday morning.  Along and ahead of the front, GFS and
ECMWF indicate LIs of 0 to -4, and CAPE values of 200 to 600 J/kg,
with ECMWF being the more impressive of the two.  Introduced slight
chances of thunderstorms across our southern half of counties for
Sunday, with just showers after 00z Monday.

We will cool down behind the front for early next week as high
pressure builds to our west.  Cool down is a relative term, however,
as readings will still generally be 5 to 10 degrees above seasonal
normals.

&&

.AVIATION...
Issued at 643 PM CST Tue Feb 7 2017

As a cold front continues to pass through the region this evening,
any remaining low clouds will eventually erode away to the east. A
broken line of showers and tstms along the front will remain in the
Pennyrile region of KY, clipping the Purchase area near the lakes.
This activity is expected to decrease in intensity and eventually
end in the early evening as it moves east-southeastward. Winds will
turn into the northwest behind the front.

Later tonight, winds will become northerly and then northeasterly
Wed morning. A low cloud deck will likely move south into the
southwestern IN, northwestern KY, and southern IL area by daybreak.
Not sure if an MVFR cig will form then. Late in the 00Z TAF period,
cigs of at least the MVFR variety will probably form across
southwestern IN and the Pennyrile region of KY ahead of a mid level
impulse, and along with an increase in wind, showers are possible.

&&

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

SHORT TERM...MY
LONG TERM...RST
AVIATION...MY/DB

Hazardous Weather Outlook
National Weather Service Paducah KY
231 PM CST Tue Feb 7 2017

ILZ075>078-080>094-INZ081-082-085>088-KYZ001>022-MOZ076-086-087-
100-107>112-114-082045-
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-
231 PM CST Tue Feb 7 2017

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

.DAY ONE...This Afternoon and Tonight

Isolated thunderstorms are possible along a cold front as it
crosses our region through early this evening. The main hazards
will be small hail and gusty winds. Organized severe storms are
not expected.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

There is a small chance of thunderstorms on Sunday, mainly across
western Kentucky, extreme southern Illinois, and southeast
Missouri. Severe storms are not anticipated at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PADUCAH KY
536 PM CST TUE FEB 07 2017

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

0435 PM     HAIL             5 SE VIENNA             37.36N 88.83W
02/07/2017  E0.75 INCH       JOHNSON            IL   PUBLIC

            REPORT OF DIME SIZED HAIL NEAR VIENNA.

&&

SP

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PADUCAH KY
559 PM CST TUE FEB 07 2017

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

0440 PM     HAIL             NEW COLUMBIA            37.31N 88.78W
02/07/2017  E0.25 INCH       MASSAC             IL   PUBLIC

0535 PM     HAIL             ROSEBUD                 37.28N 88.58W
02/07/2017  M0.25 INCH       POPE               IL   TRAINED SPOTTER

&&

SP

Special Weather Statement
National Weather Service Paducah KY
640 PM CST TUE FEB 7 2017

KYZ011-013-080115-
Lyon KY-Caldwell KY-
640 PM CST TUE FEB 7 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CALDWELL AND CENTRAL
LYON COUNTIES UNTIL 715 PM CST...

At 640 PM CST, Doppler radar was tracking a strong thunderstorm near
Eddyville, moving east at 25 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Princeton, Eddyville and Kuttawa.

LAT...LON 3700 8820 3701 8822 3711 8817 3710 8781
      3693 8796
TIME...MOT...LOC 0040Z 278DEG 22KT 3704 8812

DRS