Toledo Weather

Lucas and Wood Counties

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area forecast discussion
national weather service cleveland oh
737 am edt tue sep 1 2026

.what has changed...
forecast remains on track with advisory level heat indices for
northern and western ohio and severe weather potential for
northeastern ohio and northwestern pennsylvania.

&&

.key messages...
1) hot and humid conditions are expected over the next few days with
heat indices approaching the low 100s. little relief is expected
overnight with lows in the low to mid 70s.

2) there is potential for multiple rounds of thunderstorms today
through friday bringing with it the potential for severe weather and
heavy rain.

&&

.discussion...
key message 1...
the upper level ridge continues to build across the southeastern
conus allowing for temperatures and humidity to build across the
great lakes region through mid week. low level flow will generally
be out of the west to southwest into friday morning that will be the
main driver to advect in the warmer and moist air mass from the
south. 850mb temperatures will begin to warm today to around 20-22c
across the region and persist through thursday. the warmer side of
those temperatures will be across western ohio with temperatures a
few degrees cooler to the east. regardless, high temperatures are
expected to rise into the upper 80s to low 90s today then with more
widespread 90s on wednesday. dew points will also climb into the
upper 60s to low 70s. this will push heat indices up to the upper
90s to low 100s with the higher end out west where the current heat
advisory is issued. additionally, there will be little relief
overnight as lows will only drop down into the mid to low 70s. the
advisory is currently valid starting this afternoon through
wednesday evening. as with normal summer heat, take precautions when
outdoors and limit strenuous activities during peak heating periods.

there is some uncertainty with how warm the eastern ohio and
northwestern pennsylvania will get as rounds of precipitation is
expected through thursday. this will generally keep temperatures
"down" a bit with the precipitation and consistent cloud coverage.
though, there maybe enough breaks in the precipitation to allow for
temperatures to rise enough for heat indices to reach the upper 90s.
will have to watch how each system develops to see if an eastward
expansion of the advisory will be necessary over the next couple of
days. for thursday, a low pressure system will be moving to the
north, and will sweep a cold front through the region that day.
there should be enough widespread precipitation during the day to
keep temperatures down. the upper level ridge will begin to weaken
across the region and temperatures will fall to be more seasonal
this weekend.

key message 2...
along the upper level ridge, a series of shortwaves are expected to
move through the great lakes region beginning today through thursday
resulting in rounds of unsettled weather. a warm and moist air mass
will be in place across the region with a large surface high to the
south. ample instability of around 2000 mlcape will be in place for
much of the week with bulk shear vectors of around 35-40 knots.
pwats will also be elevated during this time period at 1.5-2.0", so
any thunderstorms that move through will have the threat for heavy
rain as well.

the first of the shortwaves are expected to move into the region
late tonight into early wednesday morning. there`s plenty of
uncertainty regarding the timing and placement of thunderstorms as
most cams disagree with each other. any storms should follow the
instability gradient which will be situated across northeastern
ohio, though how far west or east it sets up depends on if any
precipitation forms today along the lake shore and limits the
instability or if there is no development today and it builds east
further. timing is also an issue as some models have the feature
moving into northeastern ohio by 6z wednesday morning whereas other
are a few hours later. once the feature gets going up stream, there
will be a better idea of the timing and placement as it moves into
the region. there should be enough in place though that if storms do
form, the would be a damaging wind threat with a secondary threat of
large hail.

there will be a break in the precipitation after this feature moves
late wednesday morning into the afternoon. confidence is low, but
some thunderstorms are possible wednesday afternoon into the evening
developing off a lake breeze or outflows from the mornings storms.
though the majority should remain dry throughout the day. the next
round of thunderstorms are expected later wednesday night into
thursday morning. a low pressure system will be moving north of the
great lakes wednesday night into thursday and will sweep a cold
front through the region on thursday. the timing of the front is
still fairly uncertain as it has shifted over the past few model
runs and varies between models as well. if the front slows, then
there may be enough time thursday morning into the mid day to allow
for a greater severe weather threat. though, if it is on the quicker
side, then the severe threat may be lower. will need to monitor how
this develops with the convection earlier in the day and timing of
the front.

for the remainder of thursday into friday, showers and thunderstorms
are likely though should be more widespread with the front and with
the surface high to the south retreating. additionally, another
shortwave is possible late thursday into friday that will provide
enough support to keep scattered showers and thunderstorms around
the region into overnight friday. the weekend forecast currently is
trending dry as canadian high pressure builds southward over the
region.

&&

.aviation /12z tuesday through saturday/...
a pronounced heat dome will remain in place across the region
today, with ridging/northwest flow aloft. this will allow
scattered to broken mid and high cloud to spill over the top of
the ridge, with occasional isolated showers possible. light
southwest winds less than 10 knots this morning will become
breezy, with gusts 15-20 knots by mid-day. hot and humid
conditions will continue.

outlook...several rounds of thunderstorms are possible across
northeast ohio and northwest pennsylvania late tuesday through
wednesday night, with a better chance at showers and storms
elsewhere in the area thursday and thursday night. a few storms
are expected to be severe with strong winds and large hail. dry
weather returns friday and saturday, with light winds and
cooler temperatures. occasional non-vfr conditions are expected.

&&

.marine...
broad southwest flow is expected to continue as a stationary
front parks northeast of lake erie, with high pressure
entrenched to the south. this pattern will persist through
wednesday before a cold front moves south across the lake on
thursday and friday. winds could briefly gust to 20 knots with
frontal passage, though small craft advisories are not expected
at this time. unsettled conditions with multiple rounds of
thunderstorms are expected through friday, though exact timing
and location of thunderstorms is uncertain at this point. any
thunderstorms that do occur could become severe, with winds > 34
knots and hail > 0.75".

&&

.cle watches/warnings/advisories...
oh...heat advisory from 2 pm this afternoon to 8 pm edt wednesday
for ohz003-006>011-017>021-027>031-036-037-047.
pa...none.
marine...none.

&&

$$

discussion...23
aviation...27
marine...27

Fulton and Henry Counties

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area forecast discussion
national weather service northern indiana
1254 pm edt tue sep 1 2026

.key messages...

- heat and humidity continue through at least midweek with peak heat
indices around 100 degrees.

- low chances for showers and storms (15-20%) north of i-80/i-90 tonight
and wednesday. if an isolated storm or two develops, it could
produce gusty to damaging winds. low confidence at this time.

- 30-50% chances for showers and storms area-wide later in the
week on thursday and friday.

&&

.discussion...
issued at 1250 pm edt tue sep 1 2026

happy september 1st and start to meteorological fall! summer shows
no signs of slowing down as we start september, with an expansive
upper level ridge overhead expected to bring hot and humid
conditions through much of this week. a heat advisory remains in
effect for the entire forecast area through 8 pm edt wednesday. our
late summer/early fall heatwave brings high temperatures in the
upper 80s to low 90s through at least midweek. with return flow off
of the gulf due to surface high pressure centered over the southeast
conus, high humidity is expected to persist through at least
midweek. despite the unexpected showers and storms this morning,
clearing is already ongoing this afternoon per visible
satellite imagery, which will allow for temperatures to climb
into at least the mid to upper 80s for highs today slightly
warmer wednesday with highs in the low 90s with the peak of the
ridge overhead. heat indices are expected to be at or slightly
above 100 degrees, especially this afternoon and again wednesday
afternoon. there will be minimal relief overnight with near
record lows in the mid 70s. heat indices around 100 degrees may
persist along and south of us 30 into thursday, so the heat
advisory may need extended in a future forecast update.

considerable uncertainty remains in regards to rain and storms
chances this week. all models have struggled with this pattern
over the past few days; a majority of recent runs of hi-res
guidance have been misleading, keeping the upper level ridge
well to our north whereas in reality, our area (especially the
northern half) has been on that periphery as well. we had
scattered showers and storms in the vicinity of the us 30
corridor this morning and none of the models showed anything
occuring. models have been taking the rain/storm chances north
out of our area, which has created challenges and considerable
uncertainty in regards to what to do with pops over the next few
days. the nbm wants to hold off on any rain for our lower
michigan counties until early thursday at the earliest. however,
i cannot rule out at least isolated shower/storm development in
our forecast area (especially north of i-80/i-90) tonight and
wednesday, where i have added broad 15-20% pops. should any
storms develop, heat and humidity should fuel mlcape values of
up to 3000-4000 j/kg and steeping low level lapse rates. spc
does have at least the northern/northeast half of our area in a
marginal risk each day through thursday with the main risk being
gusty to damaging winds. confidence is low given the
aforementioned uncertainty with models. better chances (30-50%)
for rain/storms area- wide are in the forecast for later
thursday into friday as the upper level ridge gradually
flattens, although uncertainty still remains in the forecast
several days out given the recent unreliable model guidance. our
far southwest counties have the best chances for remaining
completely dry this week with heat and humidity continuing
through late in the week. by the weekend, temperatures trend
closer towards normal with highs in the low 80s.

&&

.aviation /12z tafs through 12z wednesday/...
issued at 645 am edt tue sep 1 2026

a west-east band of showers is ongoing this morning from
northeast illinois to just south of the ksbn vicinity. these
showers appear to be developing at the crest of a mid level
thermal ridge where a very subtle mid trough is approaching
southern lake michigan. persistent isentropic ascent along this
west-east corridor (albeit weaker than last evening) should
sustain these showers eastward across northeast indiana,
possibly taking a slight southeast turn mid morning. isolated
showers should affect ksbn vicinity early this morning and may
clip kfwa during the mid morning hours. it does appear by midday
that this isentropic ascent should largely weaken and attention
will turn to any isolated shower/storm development this
afternoon and early evening across far northern indiana.
confidence remains low in this redevelopment this afternoon and
will keep tafs dry after 18z at this time. better chances of
storms tonight should focus back across northern iowa/southern
minnesota at the nose of a low level jet. this may keep focus of
showers and storms focus northwest of the local area tonight
into early wednesday morning.

&&

.iwx watches/warnings/advisories...
in...heat advisory until 8 pm edt /7 pm cdt/ wednesday for
inz005>009-012>015-017-018-020-022>027-032>034-103-104-
116-203-204-216.
oh...heat advisory until 8 pm edt wednesday for ohz001-002-004-005-
015-016-024-025.
mi...heat advisory until 8 pm edt wednesday for miz078>081-177-277.
marine...none.

&&

$$

discussion...johnson
aviation...marsili

Monroe and Lenawee Counties

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area forecast discussion
national weather service detroit/pontiac mi
1025 am edt tue sep 1 2026

.key messages...

- very warm or hot and humid conditions today and tomorrow.

- favorable conditions for potential severe weather exist today
through tomorrow. a marginal risk for severe weather is in place
today with wednesday a marginal to slight risk for tomorrow.

- more rain and thunderstorm chances during the late week.

&&

.update...

southeast michigan is sandwiched between the large upper level low
over northwest ontario and the strong upper level ridge centered
over western kentucky/tennessee. 12z dtx raob showed warm and dry
mid levels in place, with 850 mb temp checking in at 22 c with an 11
c dew pt depression. thus, looks like the cap should hold for most
of the day. a broken line of convection just south of the border,
extending back west into eastern iowa, embedded within the northern
edge of the 850-700 mb theta-e ridge. this is allowing for high
clouds to stream across southern lower michigan, which should have
modest impact on keeping maxes in the lower 90s/near 90 degrees.
with surface dew pts in the lower 70s/near 70, heat indices do look
to peak in the upper 90s/near 100 degrees. however, shorter
september daylight remaining, peak values should only last for an
hour or two, so no heat advisory is planned. we will have to take a
closer look at tomorrow.

the deeper moisture axis over the northern ohio valley is expected
to lift north this evening/tonight, presenting a little better
chance of showers and thunderstorms. a high degree of instability
will build today, with rap indicating mlcapes of 3000 j/kg with 40+
knots of effective shear. thus, if the surface low/front across the
mid sections of lower michigan is sufficient to trigger something
late today, severe weather is a concern. an outflow boundary from
activity to our south or lake breezes could also serve as focal
point. dry mid levels should limit areal coverage, but isolated
severe threat is certainly justified, with machine learning for both
wind and hail.

&&

.prev discussion...
issued at 441 am edt tue sep 1 2026

aviation...

a brief period of fog development remains possible prior to daybreak
as high clouds exit the region, given the light winds and abundant
low level moisture. otherwise outside of a low chance for a stray
isolated shower, dry conditions continue this morning. this
afternoon and evening will showcase a highly conditional
thunderstorm environment. a capped environment is expected to limit
shower and thunderstorm coverage throughout the day. however, there
remains low end chances for isolated to scattered development in the
late afternoon and evening hours, possibly derived with lake
convergent boundaries. the boundary derived from lake erie would
place the metro terminals as the most favorable location for
development, thus will retain a prob30 group for this potential. any
thunderstorms would have the ability to rapidly intensify given the
high instability in place.

d21/dtw convection...there will be a low chance (20-30%) for
isolated to scattered thunderstorm development this afternoon and
evening. strong to severe thunderstorm development will be possible
with any thunderstorm development today.

dtw threshold probabilities...

* low this afternoon and evening.

prev discussion...
issued at 352 am edt tue sep 1 2026

discussion...

southeast michigan will reside on the northern periphery of a high
pressure ridge slowly migrating east across the oh/tn valleys to the
atlantic coast over the next several days. a warm and humid airmass
will settle into the area and persist and support chances for
multiple rounds of showers and thunderstorms with some storms
possibly becoming strong to severe. models struggling to come to a
consensus with this pattern and predictability remains low over the
next 2-3 days.

for today, an 850-500 mb theta-e ridge axis containing deep moisture
will hover around lower michigan today and pivot northward later in
the day. surface dewpoints have already climbed to the 70 marks in
parts of the area this morning. the 00z raob from last evening
observed pwat at 1.60 inches with pwats approaching 2.00 inches
expected to pivot northward with the theta-e ridge. temperatures at
850 mb have also climbed to 20c and are forecast to hold around there
over the next couple days, which would support high temperatures up
to around 90 degrees. presence of a cap with warming mid-levels along
with some drying aloft is bringing some confidence that any
widespread convection is becoming less likely today. this leans the
forecast towards the higher temperature outcome putting heat indices
up toward 100 degrees in parts of lower michigan. it still looks
borderline for prolonged heat indices to 100 degrees or greater, so
will hold off on any headlines for now. regardless, a warm and muggy
day will be in store. while widespread convection looks unlikely
during much of the day, the underlying environment will be supportive
of strong to severe thunderstorms if any cells are able to overcome
any capping via local boundaries. sbcape values will be up to 2000+
j/kg with the nam advertising 4000-5000 j/kg by late afternoon.
effective shear will be up to 40+ knots and mid-level lapse rates
will be up to 6-7 c/km. late this afternoon into the early half of
tonight appears to be the best opportunity for potential convection
to develop while a shortwave also rounds the ridge across lake
michigan. confidence remains low on where convection may develop, but
the parts of the saginaw valley close to saginaw bay looks favored
by some of the latest guidance. will also need to keep an eye on any
upstream development that may try and roll into the forecast area.
any cells or clusters of cells that can develop will be capable of
strong to severe winds and hail along with heavy downpours that could
lead to localized flooding, thus the entire cwa is in a marginal
risk for severe weather.

for tomorrow, a shortwave within a belt of strong mid-level westerly
along with a potential nearby cold frontal boundary will be the
items of interest for another round of potential strong to severe
thunderstorm development. models again not offering much consensus
on how wednesday may play out, as some point to an early afternoon
uptick in convection while others point toward convection not
occuring until late in the day into wednesday night. timing of
convection ultimately will determine overall severe weather threat.
parameter space though bulk of the day will again be supportive of
isolated to scattered severe weather if timed well in the diurnal
cycle (mlcapes to 1000-3000 j/kg, effective shear to 40+ knots, and
mid-level lapse rates 6-7 c/km). severe wind and hail with locally
heavy rain will again be the main threats with a low end tornado
potential. the other item of note for wednesday will be the heat and
humidity bringing heat index values back up to around 100 degrees,
which will be dependent on how convection eventually plays out.
headlines may be possible if early day convection does not pan out
and less cloud cover allows for max heat index values to be realized.

aforementioned cold front will eventually be pushed southward
keeping shower and thunderstorm chances in the forecast late
wednesday night into thursday morning. though, instability will be
decreasing throughout the night. the frontal boundary hanging around
lower michigan thursday morning/afternoon will again provide a focus
for additional isolated strong to possibly severe convection as
another shortwave is advertised to crest the building ridge axis.
post frontal airmass does look to cool daytime temperatures back
down into the 80s for the late week period.

marine...

a low pressure system over southern manitoba will track through
ontario today resulting in periods of active weather locally. there
is an occluded front reaching down into northern minnesota with a
warm front then extending east through the straits and northern lake
huron. a series of mid level disturbances have been initiating
rounds of showers and thunderstorms which will continue to occur
through wednesday until the cold front drops through the region. any
break in the rain will be short lived as the front lifts back north
on thursday providing additional chances of storms. winds will be
fluctuating alot this week with the frequency of frontal passages.
the weak gradient will keep speeds down through the week though with
max wind gusts rarely touching 20 knots. the slightly cooler air
over the waters brings chances of waterspouts with any of the storms
over the lakes this week.

&&

.dtx watches/warnings/advisories...
mi...none.
lake huron...dense fog advisory until 2 pm edt this afternoon for lhz361.

lake st clair...none.
michigan waters of lake erie...none.
&&

$$

update.......sf
aviation.....am
discussion...aa
marine.......drk


you can obtain your latest national weather service forecasts online
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