CLE issues Area Forecast Discussion (AFD) at Feb 28, 9:42 AM EST276
FXUS61 KCLE 281442
AFDCLE
Area Forecast Discussion
National Weather Service Cleveland OH
942 AM EST Fri Feb 28 2025
.SYNOPSIS...
Low pressure will drop across the Great Lakes through tonight,
dragging a strong cold front through the area this evening. High
pressure builds in on Saturday and persists through Monday.
The next low pressure lifts into the Great Lakes Wednesday.
&&
.NEAR TERM /THROUGH SATURDAY/...
A potent clipper on the leading edge of a tropospheric polar
vortex lobe will drop southeast across the northern and eastern
Great Lakes today and tonight. This clipper will push a strong
cold front across the area this evening, with a brief return to
much colder weather for this weekend behind it.
It'll be a mild Friday with increasingly gusty southwest winds
ahead of the approaching cold front. We should stay dry through
at least 4 or 5 PM area-wide. Lower stratus out east will exit
this morning, with mid and high-level clouds quickly arriving
from the northwest through the afternoon. Highs today will range
from the low to mid 40s in Northwest PA, to the lower 50s along
the I-77 corridor, to the mid to upper 50s in Northwest OH.
Left the area of the Wind Advisory as is, as it best captures
where confidence/duration in advisory-level gusts is greatest.
There will be a 2-3 hour window starting around 4 PM where a few
gusts to 45 MPH are possible near the eastern lakeshore, though
the strongest low-level jet moves over that area after peak
heating so mixing won't be quite as optimal as in the advisory.
A few gusts up to 50 MPH remain possible in the Wind Advisory
area this afternoon or early evening. Pushed the start time of
the advisory back until 12 PM, as am confident we won't have any
advisory-level gusts until at least that time. The end time of
7 PM looks good given loss of heating and low-level mixing with
sunset this evening. Another push of 30-40 MPH gusts is likely
late this evening into the overnight along and just behind the
cold front, though expect those to remain sub-advisory.
Some light rain showers are possible this evening along and just
ahead of the cold front. Have at least a slight chance POP (20%)
everywhere, with POPs increasing into the chance (30-50%) range
east of the I-71 corridor and likely (60-70%) in Northwest PA.
A secondary trough and stronger surge of cold advection drops
through the area after midnight and into early Saturday morning,
bringing potential for flurries and a few snow showers...with
some enhancement south-southeast of Lake Erie. Temperatures
aloft become cold enough for pure lake effect snow into the day
on Saturday, with reasonably well-aligned northwest flow in the
boundary layer over Lake Erie. That said, moisture depth quickly
becomes shallow with lake-induced equilibrium heights only in
the 5-7k foot range. The increasingly strong early March sun
angle and icy lake are also negatives. Have slight to chance
POPs (20-50%) for snow showers from North Central OH and the
Mansfield area points east, though am not expecting particularly
noteworthy accumulations. By early Saturday, temperatures are
expected to fall well into the 20s. There will be little diurnal
temperature rise on Saturday, with highs generally in the mid
to upper 20s. Gusts up to 30 MPH will remain possible through
about midday Saturday before slowly dropping off into Saturday
night. Total snow accumulations through the day Saturday should
generally be an inch or less... except locally up to a couple
inches possible in the higher terrain of eastern Erie County PA.
&&
.SHORT TERM /SATURDAY NIGHT THROUGH MONDAY NIGHT/...
A brief shot of arctic air will continue for the remainder of the
weekend as the axis of the mid/upper trough crosses the southern
Great Lakes Saturday night into Sunday morning. This will bring the
coldest air across the region, with 850 mb temps progged to reach -
15 to -18 C in the 06-15Z Sunday timeframe. This combined with NW
cyclonic flow across Lake Erie and decent breaks in the ice cover
will support lake-effect snow showers over the favored upslope areas
of the primary and secondary snowbelts. A big limiting factor is
that the airmass is very dry, but the boundary layer flow will
remain decently well-aligned Saturday night into Sunday morning, and
NAM BUFKIT forecast soundings suggest at least weak to moderate
Omega (lift) into the DGZ as the trough axis swings overhead. For
these reasons, slightly increased PoPs from the previous forecast
since confidence is building for the snow showers. Most areas in the
primary and secondary snowbelts inland from the lake will see a few
tenths to up to 1 inch of snow, but could see an additional 1 to 2
inches in NW PA where HREF and RGEM guidance is suggesting a
possible Lake Huron connection.
The lake-effect snow showers will shut down quickly Sunday afternoon
as the mid/upper trough axis starts to push into the eastern Great
Lakes and a large area of surface ridging builds northeastward from
the Mississippi Valley. Most areas will see sunshine by late
afternoon. As the high slides across the region Sunday night, clear
skies and light winds will set up strong radiational cooling
resulting in a very cold late winter night.
The cold airmass will quickly retreat Monday as the mid/upper trough
lifts out of the Great Lakes allowing for rapid height rises across
the region. As the surface high slides into the Mid Atlantic, it
will set up southerly return flow. This will signal a warming trend
that will last into midweek. A mid-level shortwave cresting the
building mid/upper ridge late Monday and Monday night will encourage
isentropic ascent along a warm front as it lifts northward, and this
will lead to a few showers by Monday night along with skies
becoming overcast.
Highs will range from the low to mid 20s in NE Ohio and NW PA to the
low to mid 30s in north central and NW Ohio Sunday, warming into the
upper 30s to mid 40s Monday. Lows Saturday night will range from the
low to mid teens, with low teens to low 20s Sunday night. A few
single digits are likely in NW PA Sunday night. Lows Monday night
will be much milder in the low to mid 30s, with some mid to upper
20s holding on in NW PA.
&&
.LONG TERM /TUESDAY THROUGH THURSDAY/...
A very active and mild midweek period is expected as a deep
mid/upper trough looks to progress from the Rockies through the
Plains and Mississippi Valley Tuesday through Wednesday while
phasing with a northern stream mid/upper trough dropping through the
Great Lakes. This will result in a very dynamic storm system, with a
rapidly deepening surface low likely developing over the southern
Plains Tuesday and tracking into the central Great Lakes by
Wednesday night. Deterministic and ensemble guidance are showing
impressive agreement on the timing and overall track of this storm
system for 5 days out, with the typical uncertainties regarding the
exact timing and track. This is a favorable overall setup and track
for a surge of warm air, high winds, and possible strong to severe
thunderstorms ahead of the trailing powerful cold front. This will
be monitored in the coming days. Much colder air will spread into
the region behind the storm system Wednesday night and Thursday,
with rain showers changing to snow showers along with the
possibility of lake-effect snow showers.
Stayed with NBM temperatures at this point, which are probably
conservative based on the pattern. This yields highs in the mid 40s
to low 50s Tuesday and mid 50s to near 60 Wednesday before falling
into the low to upper 30s by Thursday.
&&
.AVIATION /12Z Friday THROUGH Tuesday/...
Mainly VFR today, though some MVFR stratus lingers across far
Northeast OH and Northwest PA this morning. The stratus is
expected to exit through the morning, allowing all sites to
improve to VFR. A cold front will drop through this evening,
with some light rain showers possible...mainly from CLE and CAK
points east. This rain should fall out of a VFR deck with
limited (if any) vsby restrictions. A secondary trough will drop
through pre-dawn Saturday, bringing flurries and some lake-
enhanced snow showers...especially from CLE and CAK points east.
Have MVFR ceilings overspreading most sites from MFD points
east into early Saturday morning, with some light snow showers
in from CLE and CAK points east. Not expecting the snow showers
to be all that impactful but vsby restrictions appear possible.
Winds are currently 7 knots or less out of the southwest. Winds
will quickly ramp up out of the southwest this afternoon, with
sustained winds of 15-25kt and gusts 30-40kt, perhaps up to 45kt
at TOL and FDY. Wind gusts will lull a bit this evening before
winds veer more west-northwest behind the cold front late this
evening and overnight. Sustained values will stay up at 14-20kt
through the night with a period of 30-35kt gusts behind the cold
front. Given decent mixing this afternoon the primary threat
will be gusts and low-level turbulence. There will be a few
hours ahead of the cold front this evening when the boundary
layer will try to decouple beneath the strong low-level jet,
introducing low-level wind shear potential. Given the strength
of the low-level jet included it at all sites except for TOL.
The LLWS threat should end once the cold front crosses.
Outlook...Patchy non-VFR possible through Saturday night in lake
effect snow showers. Additional non-VFR likely in rain Tuesday
and especially Tuesday night.
&&
.MARINE...
Lake Erie continues to be primarily ice covered and thus, the
issuance of Small Craft Advisories remains suspended.
Strong SW winds of 15-25 knots with gusts of 25-35 knots will
develop on the lake late this morning through the afternoon. This
could result in dangerous ice floes as any ice attached to the south
shore or the islands breaks off and drifts northeastward. A Marine
Weather Statement has been issued for this potential. Otherwise,
winds will turn to the NW behind a cold front tonight with speeds
still in the 15-25 knot range before decreasing to 10-15 knots
Saturday afternoon and evening. NW winds will further decrease to 5-
10 knots Saturday night and Sunday while backing to SW by late
Sunday. SW winds of 5-10 knots will continue through Monday before
turning S and increasing to 10-20 knots by Tuesday.
&&
.CLE WATCHES/WARNINGS/ADVISORIES...
OH...Wind Advisory until 7 PM EST this evening for OHZ003-006>011-
017>020-027>030-036-037-047.
PA...None.
MARINE...None.
&&
$$
SYNOPSIS...Sullivan
NEAR TERM...Kahn/Sullivan
SHORT TERM...Garuckas
LONG TERM...Garuckas
AVIATION...Sullivan
MARINE...Garuckas
Source:
CLE issues Area Forecast Discussion (AFD) at Feb 28, 9:42 AM EST---------------
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