Toledo Weather

Lucas and Wood Counties

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area forecast discussion
national weather service cleveland oh
201 am edt wed sep 2 2026

.what has changed...
main change to the forecast was to expand the heat advisory for
wednesday to include all of northern ohio.

&&

.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 tonight
through friday with daily chances for severe weather and heavy
rain.

&&

.discussion...
key message 1...
upper level ridge persists across the eastern conus allowing for
continued heat and humidity to impact the region through thursday.
temperatures at 850mb remain warm in the 20-22c range wednesday
before lowering slightly into the 18-20c range by thursday. daily
afternoon highs warm into the low 90s on wednesday and upper
80s on thursday. there will be little overnight relief as lows
settle in the low 70s each night. despite the potential for
early morning convection, have expanded the heat advisory to
include the remaining counties in northern ohio for wednesday.
confidence in morning showers and storms remains high, however
guidance continues to show rapid clearing of lingering cloud
cover by late wednesday morning. there should be enough clearing
to allow for temperatures to warm and heat index values to rise
into the upper 90s to lower 100s. additionally the entire
forecast area remains under major heatrisk (level 3 of 4) on
wednesday. heat lingers into thursday but confidence is
currently too low to extend the heat advisory beyond wednesday
night.

key message 2...
a series of ridge riders will continue to crest atop the upper ridge
axis through thursday. these shortwaves will provide numerous
chances for showers and thunderstorms into the end of the week.
daily chances for strong to severe storms exist given amble
instability (2000 j/kg mlcape) and favorable bulk shear (30-35
knots) in the warm and moist environment. some of the latest
cams have hinted at isolated showers and storms entering
northwest ohio tonight though there is low confidence in any
strong to severe storms this evening. hi-res guidance continues
to show storms pushing into northeast ohio and northwest
pennsylvania before daybreak on wednesday. strong to severe
storms are likely with the early morning round, particularly
where the swody1 slight risk (level 2 of 5) exists. primary
hazards will be damaging wind gusts and large hail. some
additional isolated showers and storms will remain possible in
the wake of the morning convection, mainly across eastern zones,
given the continued unstable and moist environment.

by wednesday night, a cold front will begin to push southward across
lake erie providing another window for strong to severe storms to
impact the region. there remains a swody2 slight risk (level 2 of 5)
for severe thunderstorms on wednesday. primary hazards in
thunderstorms associated with the cold front wednesday night will be
damaging wind gusts and large hail. there is a lower chance for
tornadoes. fairly widespread showers and storms will be ongoing
thursday into friday. the severe weather threat area shifts further
south to central ohio by thursday as the cold front sinks southward.
trending drier by the weekend as canadian high pressure builds over
the region.

with the warm and moist environment, pwats will range between
1.5-2 inches. any thunderstorms that move across the region
will be capable of producing heavy rainfall. localized flooding
is possible where repeated rounds of thunderstorms occur.

&&

.aviation /06z wednesday through sunday/...
expect widespread vfr conditions tonight, with occasional
scattered high clouds, and patchy ifr/lifr fog in/around the
toledo terminals. winds will remain light from the southwest.
convection currently developing across portions of mi and wi
will intensify and push eastward overnight, dropping southeast
across lake erie prior to sunrise. several rounds of convection
are likely as this feature crosses the region, and for that
reason have included tempo groups for -tsra at cle, eri, and yng
after 08z. strong to severe winds are possible with these
storms, as well as frequent lightning and small hail. storms
are expected to move out of the area by 13z.

the rest of the region will stay vfr with scattered to broken
high and mid level clouds passing through during the next 24
hours. south and southwest 5 to 10 knots are expected, with a
few gusts to 20 knots during the midday and afternoon hours.
scattered convection will develop again during the afternoon
and evening across ne oh and nw pa, but uncertainty exists with
exact timing and location.

outlook...a cold front will slowly move across the area from
the northeast towards the southwest on thursday. scattered
showers and storms will bring non-vfr conditions wednesday
night through thursday night. high pressure and fair weather
will return friday into the weekend.

&&

.marine...
southwest winds with good marine conditions are expected on
lake erie through midnight. there is some potential for stronger
thunderstorms to cross mainly the central and east half of lake
erie in the pre-dawn hours of wednesday which could lead to
erratic wind and wave conditions. another round of stronger
thunderstorms are also possible wednesday night as a cold front
settles south.

a gradual wind shift to the north will occur by thursday night
with winds decreasing into friday. northeast flow over the
weekend could result in some choppy conditions with waves of 3
feet or less.

&&

.cle watches/warnings/advisories...
oh...heat advisory until 8 pm edt this evening for ohz003-006>011-
017>021-027>031-036-037-047.
heat advisory from 11 am this morning to 8 pm edt this evening
for ohz012>014-022-023-032-033-038-089.
pa...none.
marine...none.

&&

$$

discussion...13
aviation...27
marine...10

Fulton and Henry Counties

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area forecast discussion
national weather service northern indiana
242 am edt wed sep 2 2026

.key messages...

- heat and humidity continue with peak heat indices around 100
degrees today.

- 10% chance of a stray thunderstorm this afternoon. 20-40%
chance of thunderstorms beginning early thursday morning.
storms may produce damaging winds. low confidence at this
time.

- not quite as hot friday and saturday, but shower and storm
chances persist (30-50% chance).

&&

.discussion...
issued at 242 am edt wed sep 2 2026

the well-advertised upper-level ridge remains the primary story this
morning, bringing heat and humidity and a non-zero chance of a stray
thunderstorm. water vapor imagery shows the ridge axis cresting
northern illinois and even far southern michigan. upstream
convection over northern ia and southeast mn has been rather cyclic
in its intensity on ir satellite, but the eastern extend of activity
is expanding across central-southern lake michigan. given the ridge
axis placement, high confidence in dry conditions this morning.
however, while i`ve shipped out a dry forecast today (10% pop), i
cannot completely rule out a stray thunderstorms this afternoon. the
primary forcing mechanism could be a departing 500-mb jet streak,
but this focuses primary across central mi and into ontario.
meanwhile, a second group of cams suggests renewed, isoalted activity
along the il-in border in the 4p-6p et window. this might be forced
by a lingering outflow/mcv from the aformentioned upstream activity.
will pass this on to the incoming shift for further consideration.

otherwise, very hot and humid once again today with highs in the low-
90s, dew points well into the 70s resulting in heat indicies of 100-
105 (as seen yesterday).

on thursday, the 500mb ridge folds somewhat in response to a
disturbance wrapping up over interior ontario. the result locally is
an increasing chance for showers and thunderstorms as the day
progresses. timing is uncertain, with some guidance favoring the
overnight period instead of the late-afternoon. our hot and humid
environment will be supportive of isolated severe thunderstorms,
but this risk is highly conditional on how any upstream activity
evolves. these storms also decrease forecast confidence in the
temperature forecast for thursday. due to anticipated cloud debris,
we`ll hold off on any extension of the heat advisory.

with the upper-level ridge somewhat displaced, we could remain
within an active period into at least the start of the labor day
weekend with showers and storms around both friday and saturday.
beyond this, there is some indication the ridge may wash back north
early next week. high temperatures monday and tuesday have a
comically large spread (10+ degrees tuesday) among the guidance,
with the in-house blend on the cool-side. with that much spread,
precipitation chances are likewise unclear. given the trough working
its way across the cascades and through montana, i would favor the
ridge axis to revisit indiana early in the week. no signs of fall
quite yet.

&&

.aviation /06z tafs through 06z thursday/...
issued at 1221 am edt wed sep 2 2026

the preexisting tafs remain on track at this time and largely
carry on. an upper-level ridge as seen on water vapor imagery
suggests upstream convection over iowa will remain north of the
area today. some cams have trended wetter (when compared to
their run 12 hours prior) in the ksbn area after 21z. this
appears to be a slight outlier, but will continue to monitor
trends for the 12z update. cannot completely rule out patchy
ground fog this morning given the hot and humid conditions.

&&

.iwx watches/warnings/advisories...
in...heat advisory until 8 pm edt /7 pm cdt/ this evening 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 this evening for ohz001-002-004-
005-015-016-024-025.
mi...heat advisory until 8 pm edt this evening for miz078>081-177-
277.
marine...none.

&&

$$

discussion...brown
aviation...brown

Monroe and Lenawee Counties

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area forecast discussion
national weather service detroit/pontiac mi
1157 pm edt tue sep 1 2026

.key messages...

- hot and humid conditions through wednesday.

- a marginal risk for severe weather is in place late tonight, with a
slight risk for wednesday and wednesday night.

- more shower and thunderstorm chances thursday and friday.

&&

.aviation...

scattered showers and isolated thunderstorms are developing from sw
lower mi back across the lake and into wi leading up to midnight,
and will continue moving eastward across se mi late tonight through
about mid morning. current trends indicate activity grazes slightly
farther south toward ptk while also still affecting fnt to mbs. the
showers/storms are preceded by mid and high cloud remnants while
visibility drifts down toward mvfr in light fog as the warm and
humid air mass remains in place over the region. after a break
during late morning to early afternoon, instability then builds for
another round of thunderstorms mid afternoon into wednesday evening,
again mainly toward mbs and fnt. storms develop overhead and/or move
in from storms ongoing around the mn/ia border region.

d21/dtw convection... the best chance for thunderstorms is north of
dtw toward the northern fringe of d21 late tonight and again
wednesday afternoon.

.dtw threshold probabilities...

* low for ceiling 5000 ft or less wednesday afternoon.

&&

.prev discussion...
issued at 950 pm edt tue sep 1 2026

update...

forecast evidence on thunderstorm trends continues to be monitored
for tonight through wednesday morning. storms in ne lower mi finally
broke through at the very end of daytime peak heating. these stay to
the north in the absence of any new development toward saginaw bay.
greater potential for storms in central and se mi is tied to the
remnants of the broken band of showers and isolated storms that was
percolating all day toward the oh/in border. the band remnants mark
the west to east moisture axis that is also roughly along the 10 c
700 mb cap, and was activated along the south flank of the upper
level jet. the moisture axis/theta-e ridge now migrates northward
tonight as the jet streak shifts farther into northern ontario.
continued development of ongoing convection across southern wi is
likely, along with a chance of new development from there into
central lower mi, as 850- 700 mb flow backs slightly sw with the help
of the diffuse 500 mb vort max. downstream mlcape settles into the
1000-2000 j/kg range and bulk shear diminishes closer to 30 knots,
however both are adequate to sustain thunderstorm clusters across the
area during the late night and early morning. the main
predictability challenge for severe potential is tied to the tendency
for storms to become elevated after midnight. the marginal spc
outlook remains in place for an isolated instance of damaging wind or
large hail in scattered storm coverage mainly along and north of
i-69 until shifting into southern ontario before noon wednesday.

prev discussion...
issued at 303 pm edt tue sep 1 2026

discussion...

a challenging forecast continues to plague the great lakes region.
a hot and humid air mass with a high degree of instability is in
place this afternoon. temperatures have reached into the upper 80s
to 90 degrees as of 2 pm, with heat indices well into the 90s. a
couple more hours left to increase those values as well. the broken
line of convection which was just south of the border this morning
within the northern edge of the 850-700 mb theta-e ridge has crept
northward into southwest lower michigan and will continue to drift
north, presenting a opportunity for showers and thunderstorms this
evening and tonight. the highest instability and wind shear are
actually located over center/northern lower michigan this afternoon
per spc mesoscale analysis, making areas north of m-46 probably the
greatest concern for isolated severe storm, but the entire cwa has a
marginal risk through tonight. once again, hi-res solutions continue
to underestimate the coverage of showers and thunderstorms.

a couple opportunities exist for ridge runners as upper level
impulses eject out of the central/northern plains both wednesday and
thursday. growing consensus points to a shortwave tracking through
northern lower michigan tomorrow (15-19z), with a surface
front/reflection along or north of i-69 providing the focus. even
with this potential earlier timing, there will most likely be
sufficient instability around to support severe storms alongside
high 0-6 km bulk shear values aoa 50 knots. a slight risk of severe
weather remains in place for both large hail and damaging winds.
machine learning even highlights the northern thumb region for a
tornado threat, which is supported by 0-1 km bulk shear values
around 25 knots. if this faster timing materializes, max
temperatures could come up short of the outgoing forecast in the 90-
94 degree range; thus, confidence is not high enough to issue a heat
advisory, as peak values in the upper 90s to around 100 degrees
could be short-lived once again.

yet another upper level impulse will race through wednesday night or
thursday morning. coupled with nocturnal low level jet enhancement,
strong thunderstorms producing heavy rain become a concern.
although, at this time, there is no indication of training. none-the-
less, pw values aoa 1.75 inches and 700 mb dew pts still locally
nearing 5 c will certainly be supportive of locally heavy rain, with
another opportunity or two between thursday night and friday night.
confidence remains low, however. longwave pattern guidance for the
weekend indicates upper level confluent flow and subsequent high
pressure building in, trending the forecast in a drier direction.

marine...

a low pressure system now entering ontario will steer the weather
across the great lakes through mid week. the warm front is now east
of lake huron with the cold front approaching lake mi leaving us in
the hot and humid warm sector. though the airmass is mostly stable
at this time, it hasn`t taken much mid level energy to spark
clusters of storms the last few days. the cold front will slowly
enter lower mi and drift se today and tomorrow leading to additional
rounds of storms through wednesday night and even into thursday if
the front stalls over the area. 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. the
very humid airmass over the lakes will also lead to fog development
over the waters, mainly the north half of lake huron which will need
to be watched for another possible dense fog advisory tonight.

hydrology...

a humid air mass will bring a chance of heavy rainfall within any
strong thunderstorm that develops. however, areal coverage and exact
timing remain elusive across lower michigan. periodic chances of
storms will exist right through friday. any strong thunderstorm will
have the potential to produce a quick 1-2 inches of rain, which can
lead to localized minor flooding of roads and poor-drainage areas.
there are currently no indications of training storms, though more
extensive flooding would become a concern if a mature mcs develops.

&&

.dtx watches/warnings/advisories...

mi...none.
lake huron...none.
lake st clair...none.
michigan waters of lake erie...none.

&&

$$

aviation.....bt
update.......bt
discussion...sf
marine.......drk
hydrology....sf


you can obtain your latest national weather service forecasts online
at www.weather.gov/detroit.