709
FXUS63 KPAH 270745
AFDPAH

Area Forecast Discussion
National Weather Service Paducah KY
245 AM CDT Sat Apr 27 2024

.KEY MESSAGES...

- The pattern remains unsettled and unseasonably warm through
  next week with multiple chances of showers and thunderstorms.
  The greatest risk for widespread rain is late Sunday through
  Monday afternoon as a cold front slowly moves through.

- There is low confidence in the severe weather potential over
  southeast Missouri and southern Illinois late Sunday into
  Sunday night. Heavy rainfall amounts between 1 to 2 inches is
  expected with locally higher amounts. Localized flash flooding
  issues cannot be ruled out.

- South winds with gusts between 20-30 mph are expected today
  and 25-35 mph on Sunday.

&&

.DISCUSSION...
Issued at 244 AM CDT Sat Apr 27 2024

A mild start to the morning as a 500 mb vort max is providing ascent
for a band of showers across the FA. Additional isolated to
scattered showers and a few thunderstorms are possible later this
morning and afternoon as impulses round a ridge over the SE CONUS.
The greatest risk for pcpn is west of the Mississippi as areas to
the east are likely to remain dry. Any isolated convection that does
manage to develop will quickly diminish tonight with the loss of
diurnal heating. Pulse storms are also favored given the lack of
shear. Otherwise, today will be breezy with strong southerly flow.
Gusts between 20-30 mph are possible. MaxTs will be unseasonably
warm in the low to mid 80s with minTs falling into the upper 60s.

By 12z Sunday, a 500 mb shortwave and 80 kt jet max will be leeward
of the Rockies as 1001-1003 mb sfc low pressure is progged to be
located over north central Kansas with a trailing cold front. Most of
the day likely remains dry as the FA will remain well in the warm
sector regime. A tight pressure gradient between a frontal boundary
over the Plains and high pressure off the Carolinas will allow for
southerly flow to prevail with windy conditions. Wind gusts between
25-35 mph will be possible. MaxTs will once again be well above
normal in the low to mid 80s with minTs in the low to mid 60s. As a
leading 500 mb shortwave ejects across the central Plains with a 500
mb low located over the Dakotas, synoptic scale forcing for ascent
Sunday evening will increase the risk for widespread showers and
thunderstorms through Sunday night. While portions of the CWA are
outlooked for severe weather by the SPC, there is still low
confidence in how unstable the atmosphere will be.

The 0z 3km NAM is the worse case scenario with an axis of 500-1000
J/kg of MLCAPE setting up over southeast Missouri and southern
Illinois. Combined with effective bulk shear of 45-50 kts and sfc-
1km SRH between 100-200 m^2/s^2, a QLCS overnight would be favored
with the main concern being damaging winds and isolated tornadoes.
However, other model guidance is much more meager with the
instability and favors more of a heavy rainfall concern. The 0z
ensembles are in good agreement with an axis of one to two inches
setting up over southeast Missouri and southern Illinois with
locally higher amounts. Meanwhile, lower QPF amounts between a half
to one inch are progged in southwest Indiana and western Kentucky.
PWATs around 1.5 inches, a warm cloud depth of 10kft AGL, and a
cloud layer mean wind that is parallel to the aformentioned frontal
boundary will support training storms that will be capable of
producing torrential downpours. Given the ongoing drought
conditions, most locations will likely be able to handle the QPF
that is progged, but a few isolated flash flooding issues cannot be
ruled out in more urban areas. The good news is locations that
really need the rain will benefit.

In the wake of fropa on Monday as the cold front lags, numerous
showers and thunderstorms will remain possible before trending drier
Monday evening. The flow aloft then turns more zonal for the middle
of the week favoring drier conditions on Tuesday. Daily shower and
storm chances return Wednesday-Friday as multiple disturbances move
through the FA. Southerly flow will allow for a warm and moist
airmass to prevail with daily maxTs in the 80s.

&&

.AVIATION /06Z TAFS THROUGH 06Z SUNDAY/...
Issued at 1207 AM CDT Sat Apr 27 2024

At KCGI/KMVN, VFR conditions expected with scattered shra
between through 09z. KCGI could again see some isolated to
scattered shra/tsra between 15z-21z. MVFR vsbys possible with
convection. At KPAH, VFR conditions expected with scattered shra
between 06z-09z, with isolated shra possible between 15z-21z.
At KEVV/KOWB, conditions will be VFR with potential LLWS between
until 14z at 020/19040kt. At all sites, surface winds will be
from the south to southeast at 7-14kts with gusts of 18-23kts,
increasing to 10-20kts with gusts around 25 kts after 13z.

&&

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

&&

$$

DISCUSSION...DW
AVIATION...RST