341
FXUS63 KAPX 121048
AFDAPX

Area Forecast Discussion
National Weather Service Gaylord MI
648 AM EDT Fri Jun 12 2026

.KEY MESSAGES...

- Gusty winds lead to high swim risks today and Saturday...

- Rain/storms today and Saturday; some strong Saturday?

- Much cooler Sunday into Early Next Week

&&

.DISCUSSION...
Issued at 344 AM EDT Fri Jun 12 2026

PATTERN SYNOPSIS/FORECAST:

Northwest flow across the western US...with several embedded PV
maxima in the flow from British Columbia through the Canadian
Prairies and into the Upper Midwest...with a PV max lifting through
WI last evening...as a 100+kt upper jet tracks through the flow from
the PacNW to the Mid MS Valley into central Ontario. 543dm upper low
centered over Manitoba/Ontario, with additional trough axis
stretching into Hudson Bay. Sharp ridge over the eastern US with a
disturbance embedded over the Mid-Atlantic. Plume of better absolute
moisture (pwats at or above 1in) extends from the Southern Plains
into Michigan, immediately ahead of the trough axis aloft...as
ridging sits over the SE US, aiding in continued return flow aloft.
Meanwhile, in the lower levels, flow is becoming northwesterly
across the Northern Plains/Upper Midwest in the wake of a cold front
draped from James Bay to central WI down into Oklahoma as of 4z;
850mb temps falling below +10C behind this, with a couple more
trough axes/cold fronts over the Upper Midwest. Even colder air and
with strengthening northerly flow poised across central Canada
northwest of aforementioned upper low...behind a 985mb surface low
over northeast Manitoba. Convection continues to cross
Michigan...both remnants of earlier convective complex that brought
a fair bit of activity to southwest Michigan, and some activity
immediately ahead of the front...with the bulk of the rainfall from
the western UP up into Ontario along the deformation axis with this
system.

Shortwave trough axis swings through today...leaving zonal flow in
its wake tonight. However...additional energy will transit the
perimeter of the upper trough from the Northern Plains to the Great
Lakes on Saturday as the upper low tries to sneak southward into
central Ontario...allowing a boundary to slowly sink south through
the area, likely reaching the OH Valley by Sunday morning...as a
sharper niblet of energy reaches the Upper Midwest. Currently
expecting this to swing through during the day Sunday...with another
lobe of PV dropping south Sunday night into Monday, which could try
to hook up with a niblet of energy over the central Plains. Broad
troughing looks to settle into the Upper Midwest/Upper Great Lakes
for the first part of next week with cooler weather on tap, though
there is a bit of uncertainty regarding position of niblets
transiting the flow. A fair bit of uncertainty for the mid-late part
of next week as a bit of energy runs over the PacNW ridging and
heads across the northern tier of the continent with attendant
cyclogenesis at the surface...which could signal potential for a
period of active weather.

FORECAST DETAILS...

Periods of gusty winds and moderate-high swim risks through
Saturday...generally expecting sustained winds to run about 5-10kts
through the bulk of the next 48-72hrs, but could be a little more
feisty (5-15kts) on Saturday ahead of approaching boundary/PV
maximum. Could be a bit gusty at times, generally in the 20-30kt
range Friday, perhaps even right on through Friday night if we are
able to stay better mixed. Appears winds pick up aloft ahead of the
aforementioned PV maximum and think some gusts in the 30-40kt realm
are possible, even as early as early Saturday morning as that
boundary slips in. Currently appears this will sink through the
region and wash out a bit as it does so...with potential for winds
to go a bit more light and variable later Saturday into Saturday
night, which could favor lake breezes in the late afternoon if
background flow diminishes early enough, and land breezes during the
overnight hours. Primary concern with winds will be the development
of moderate to high swim risks with increased wave action at many of
our beaches Friday and Saturday...perhaps even into Sunday as well,
with gusts of 20-30kts possible yet again.

Storm/rain potential today into the weekend...Expect some
showers/storms to be ongoing this morning into midday with the
shortwave trough axis swinging through, and potential for
redevelopment this afternoon, especially across the EUP and Tip of
the Mitt regions (possibly a bit further south?) with the trough
axis still in the area and the left exit region of a jet aloft in
the vicinity. Surface pressure pattern also appears rather wavy, and
suspect some kind of mesoscale perturbation (gravity waves?
influence of cooler lakes/warmer land?) will be in play. Diurnal
heating likely in play as temps cool aloft (esp toward that Tip of
the Mitt/EUP vicinity) suggests we should destabilize through the
day, especially later this afternoon; potential for 500-1000J/kg of
surface-based CAPE, and perhaps a little more across the Yoop, esp
if better diurnal heating is realized with better cooling aloft.
While we shouldn`t be quite as moist as the previous couple
days...think some moisture will hang around, noting pwats could
remain as high as an inch through this evening; some potential for
skinny CAPE and warm cloud layers still flirting with 3km could
signal some more robust rainfall totals wherever storms persist. Not
a ton of deep layer shear present, and think activity will likely be
of the popcorn/pulse type vs organized, but could produce some sub-
severe gusty winds; perhaps a little more in the way of hail (and
maybe lightning) given the freezing level should be coming down a
bit today.

Saturday... appears some activity may try to sneak in along the
boundary from the west late Friday night into early Saturday. Have
concerns this could lead to increased cloud cover and diminished
diurnal heating/instability for storms later in the day (could focus
this further southward than currently anticipated)...though guidance
soundings suggest it could rather moisten the environment and make
things a little more favorable for later-day activity, assuming some
breaks in the clouds. This early day activity may be more of a heavy
rain threat, noting signals for better saturation through the column
and potential for cell motion to be parallel to the boundary and
thus track over similar areas through the morning, possibly into the
afternoon. Pwats should be on the high end again, perhaps cranking
up toward 1.25 inches along the boundary; do note some small signals
in probabilistic guidance for an inch of rain in 24hrs across some
portion of the area Saturday.

If clouds break and diurnal heating ramps up in the afternoon, could
see a little more vigorous development, noting signals for Surface-
based CAPE around 1000J/kg if this occurs. Primary focus for
afternoon activity should be along this boundary and any lake
breezes that manage to develop; guidance signals a couple areas of
interest -- one across the length of the EUP, and another across NE
Lower MI. Stronger winds aloft suggest deep layer shear should be
better as well, perhaps all day long, which could lead to storms
becoming a little better organized vs today; some signals for a bit
drier layer in the mid-levels in the afternoon could suggest
damaging wind as a threat with any afternoon storms. Conditions are,
as usual, a touch better on the other side of the lake with a more
steadfast tap of warm, moist air up the MS Valley through the day,
and will not be surprised if some activity develops upstream and
tries to cross the Lake during the afternoon...though not impossible
any convective complex forms to our south/stays south and keeps
things from getting too crazy up here (par for the northern Michigan
course).

Cooler early next week...0C isotherm looks to swipe northern
Michigan Sunday, suggesting temps may struggle to get into the mid
60s, especially with potential for clouds/rain around with a PV
slipping through. (Would not be surprised if some parts of the EUP
end up struggling to break 60.) Rather like late September than mid
June. The cool idea should persist into at least Monday and perhaps
Tuesday, pending the evolution of niblets in the flow...with signals
for some return flow (maybe?) ahead of a more potent niblet for
midweek. For now, appears there will be enough perturbations and
potential moisture around to keep overnight lows from tanking too
deeply...but low to mid 40s are likely, especially for the interior,
at least Sunday night into Monday, and perhaps Monday night into
Tuesday as well. If we end up with more aggressive ridging/drying
either of these days, with high pressure/weak pressure gradient more
firmly overhead...suspect it`s not impossible a few of the typical
cold spots could drop into the upper 30s.

&&

.AVIATION /12Z TAFS THROUGH 12Z SATURDAY/...
Issued at 648 AM EDT Fri Jun 12 2026

Low clouds to start the morning, MVFR at MBL/TVC/PLN, and IFR at
CIU. Conditions will quickly improve this morning, and all sites
should be VFR by 15Z. (APN simply stays VFR.) Could be some
showers late today up by CIU, but otherwise VFR lasts into
tonight.

Breezy w to sw winds today and tonight.

&&

.APX WATCHES/WARNINGS/ADVISORIES...
MI...Beach Hazards Statement through this evening for MIZ025-031-
     088.
MARINE...Small Craft Advisory until 9 AM EDT this morning for
     LHZ345>349.
     Small Craft Advisory from 1 PM this afternoon to 8 PM EDT this
     evening for LHZ345-346.
     Small Craft Advisory until 9 AM EDT this morning for LMZ341-
     346.
     Small Craft Advisory from 1 PM this afternoon to 8 PM EDT this
     evening for LMZ341.
     Small Craft Advisory until 10 PM EDT this evening for LMZ323-
     342-344-345.
     Small Craft Advisory until 9 AM EDT this morning for LSZ321-
     322.

&&

$$

DISCUSSION...FEF
AVIATION...JZ