307
FXUS61 KCLE 070710
AFDCLE

Area Forecast Discussion
National Weather Service Cleveland OH
310 AM EDT Sun Sep 7 2025

.SYNOPSIS...
A trough lingers over and very near Lake Erie as a ridge builds
slowly from the north-central United States and Lower Missouri
Valley today. The ridge then affects our entire region and Lake
Erie tonight through at least Tuesday. Simultaneously, the embedded
high pressure center wobbles northeastward from near the Lower
Missouri Valley and through the southern Great Lakes to New
England.

&&

.NEAR TERM /THROUGH MONDAY/...
WSW`erly flow aloft veers to WNW`erly over our entire region by
this late evening as a shortwave trough axis moves from the
western Great Lakes early this morning to western NY and western
PA by late this evening. During the remainder of today through
Monday, WNW`erly flow aloft and embedded/subtle shortwave
troughs affect our CWA as a ridge builds slowly from the
northern and central Great Plains and eventually the Upper and
Mid MS Valley. At the surface, a trough lingers over and very
near Lake Erie today as the ridge builds slowly from the north-
central United States and Lower MO Valley. Tonight through
Monday, the surface ridge affects our entire region as the
embedded high pressure center wobbles generally NE`ward from
near the Lower MO Valley to central NY by sunset Monday evening.
This weather pattern evolution at the surface and aloft will
maintain net low-level CAA across our region through tonight and
then support the development of weak net low-level WAA on
Monday. Despite intervals of sunshine, late afternoon highs are
expected to reach only the lower 60`s to near 70F today and the
mid 60`s to lower 70`s on Monday. In between, overnight lows
should reach mainly the lower 40`s to lower 50`s around daybreak
Monday.

Primarily fair weather is expected during the near-term period
as stabilizing subsidence accompanies the above-mentioned
surface ridge. However, a W`erly to NW`erly, but primarily
WNW`erly, mean low-level flow of sufficiently-cold/moist air
over/downwind of Lake Erie will allow lake-effect rain showers
to impact the snowbelt and vicinity in NE OH and NW PA, but
especially the primary snowbelt, today into tonight. The lake-
effect rain showers will be heavy at times today as periods of
greater/deeper low-level moisture preceding low-level shortwave
trough axes contribute to periodic greater lake-induced CAPE
(LICAPE) of moderate magnitude. Based on latest trends in model
guidance, the potential for lake-effect thunderstorms now
appears to be minimal as model soundings suggest LICAPE will
primarily be limited (i.e. less than 200 J/kg) within the
primary electrical charge separation zone. However, cannot
totally rule-out a few instances of lake-effect lightning during
the daylight hours of today. During this evening, lake-effect
rain showers will become lighter as LICAPE wanes via a lowering
subsidence inversion and low-level dry air advection. During the
predawn hours of Monday morning, lingering and light lake-effect
rain showers streaming generally ESE`ward over and downwind of
Lake Erie, across the primary snowbelt and vicinity, are
expected to end as LICAPE continues to wane for the same
aforementioned reasons.

&&

.SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY/...
The aforementioned ridge aloft will continue to build into our
region from the west Monday night and then begin to exit slowly
E`ward through Wednesday as a shortwave trough approaches from
the north-central United States. At the surface, our region
remains along the western flank of the ridge. Fair weather is
expected as stabilizing subsidence accompanies the ridge. This
evolution of the weather pattern at the surface and aloft will
allow net low- level WAA to impact northern OH and NW PA. Lows
mainly in the lower 40`s to lower 50`s around daybreak Tuesday
will be followed by late afternoon highs in the 70`s. On
Wednesday, lows mainly in the mid 40`s to mid 50`s around
daybreak are expected to be followed by late afternoon highs in
the 70`s to lower 80`s.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/...
During Wednesday night through Thursday morning, the axis of the
above-mentioned shortwave trough and a weak attendant cold front
are still expected to move generally SE`ward through our region.
Latest trends in model guidance and our official forecast
continue to indicate rather dry air at and near the surface
should prevent measurable rainfall from accompanying the passage
of the cold front and shortwave trough axis. Lows should reach
mainly the upper 40`s to mid 50`s around daybreak Thursday.

During the rest of Thursday through Saturday, predominantly
NW`erly to N`erly flow aloft is expected over our region as a
ridge aloft builds slowly from the central United States. At the
surface, the ridge is expected to impact our region as the
embedded high pressure center moves from near James Bay toward
New England. Behind the weak cold front, negligible air mass
change is expected on Thursday through Friday, while weak net
low-level WAA should become established across our region Friday
night through Saturday as we become located along the western
flank of the surface ridge. As a result, daily late afternoon
highs are expected to reach the 70`s to lower 80`s on Thursday
through Saturday. Daily lows should reach mainly the mid 40`s to
mid 50`s around daybreak Friday and Saturday, respectively.
Stabilizing subsidence accompanying the ridge is expected to
promote fair weather.

&&

.AVIATION /06Z Sunday THROUGH Thursday/...
Lake effect clouds and rain are developing into NE OH and NW PA
this morning with the combination of a surface trough moving
across the lake and colder air aloft. The bulk of the rain and
clouds this morning are funneling up the lake toward KERI, which
will have some MVFR impacts over the next several hours. Later
this morning, the set up will transition to a more traditional
lake effect pattern with scattered clouds and rain across NE
OH/NW PA with generally lower VFR conditions. Have some PROB30
groups for MVFR rain at KCLE and KYNG and any new rain should
dodge both KCAK and KERI. Elsewhere, few to scattered clouds
will hover across the region and conditions will be VFR with
west to northwest winds. Flow will back later this afternoon and
evening and will disrupt lake effect across the region and the
pattern will transition to dry and clearing.

Outlook...Non-VFR possible in lake effect rain and clouds across
Northeast Ohio and Northwest Pennsylvania Sunday night into
Monday. Otherwise, mainly VFR expected through Thursday.

&&

.MARINE...
Elevated west to northwest winds will continue across the lake
today. Overall, winds have stayed in the 10 to 20 kt range and
waves over the eastern half of the lake are generally in the 2
to 4 ft range. There could be some brief wind and wave
increases this morning as a trough moves through and lake
effect rain and clouds develop. This could allow for some brief
3 to 5 ft waves. Otherwise, the marine hazards were adjusted
earlier this evening to end at 1 PM Sunday, given the less
impressive flow across the lake and more of a 2 to 4 ft flavor
that remains reasonable. Waterspout potential will exist with
the trough moving through the region and the lake effect
precipitation and will remain mentioned in the forecast for
today.

High pressure will enter the region for Monday and Tuesday.
Northeast flow will be favored on Monday before southerly,
offshore flow returns on Tuesday as the system passes to the
east. The lake will remain between the departing high to the
east and a cold front to the northwest on Wednesday and flow
will be variable on the lake. The front will cross the lake by
Thursday and allow for high pressure to the north to influence
the area with north to northeast flow for Thursday and Friday.

&&

.CLE WATCHES/WARNINGS/ADVISORIES...
OH...Beach Hazards Statement from 1 PM EDT this afternoon through
     Sunday evening for OHZ010>012-089.
PA...Beach Hazards Statement from 1 PM EDT this afternoon through
     Sunday evening for PAZ001.
MARINE...Small Craft Advisory from 1 PM this afternoon to 8 PM EDT
 Sunday for LEZ145>149.

&&

$$

SYNOPSIS...Jaszka
NEAR TERM...Jaszka
SHORT TERM...Jaszka
LONG TERM...Jaszka
AVIATION...Sefcovic
MARINE...Sefcovic