Toledo Weather

Lucas and Wood Counties

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

.what has changed...
no major changes to the forecast with elevated heat risk and severe
weather the main impacts today and thursday.

&&

.key messages...
1) elevated heat risk conditions continue today for ohio as heat
indices will be in the upper 90s to low 100s.

2) there will be severe weather potential across northeastern ohio
and northwestern pennsylvania this morning through overnight
tonight.

&&

.discussion...
key message 1...
well above normal temperatures will continue today along with
increased dew points keeping heat indices in the upper 90s to low
100s. the upper level ridge continues to be in place across the
southern conus allowing for persistent west to southwesterly flow
across the region to continue today into the overnight. this will
push highs today a touch warmer into the low 90s with dew points
climbing into the low to mid 70s again. heat indices as a result
will rise up into the upper 90s to low 100s. portions of western
ohio will be warmer than to the east as there should be limited
precipitation and cloud cover for much of the day. for cleveland
eastward, precipitation is expected this morning and again in the
evening, but there should be a long enough break in between to allow
for temperatures to climb quickly. for the northwestern pennsylvania
areas, they will be far enough east to were temperatures shouldn`t
climb up into the 90s, therefore heat indices will be below advisory
criteria. with that being said, it still will feel hot with heat
indices in the mid 90s, and precautions should be taken as needed.
overnight lows wednesday into thursday will still be elevated as
well into the low to mid 70s offering little relief. heat risk will
stay elevated at a level 3 out of 4 for the entire cwa due to this.

thursday will start to bring some relief to the region as a cold
front approaches from the north and more widespread precipitation is
expected at some point during the day. western and central ohio will
still have elevated heat indices and heat risk though, as
precipitation will not have reached before peak heating. there is
some uncertainty in this as morning convection may be moving across
the area that would limit the high temperatures for the day. if the
convection does not pan out, then thinking is that an area from
roughly wayne/holmes northwest to lucas will need an extension in
the advisory. the remainder of the eastern portions of the cwa
should have enough precipitation and cloud cover to keep
temperatures and heat indices down in the upper 80s and low to mid
90s respectively.

temperatures will begin to regulate friday into the weekend to more
seasonal as canadian high pressure builds south into the region.
highs will be in the upper 70s to mid 80s with overnight lows in the
upper 50s to mid 60s through the weekend.

key message 2...
more rounds of showers and thunderstorms are expected this morning
through the overnight hours. for this morning, there is a shortwave
trough located over southern ontario that will push southeastward
into new york through the mid-morning. this will help support
scattered showers and thunderstorms this morning across northeastern
ohio and northwestern pennsylvania. there will be some instability
in place along with around 40 knots of bulk shear that, if storms
organize, could support damaging wind gusts. will monitor upstream
in southern ontario and eastern michigan for storm formation, but
currently storms across western michigan have started to weaken and
the environment may not be suitable for thunderstorm development.

there will be a break in the showers and precipitation once the
shortwave moves eastward and the next shortwave enters the region
later this afternoon/evening. this will allow for instability to
build back to around 2000 j/kg and lapse rates of 7-7.5 c/km across
eastern ohio and northwestern pennsylvania. bulk shear will also in
the neighborhood of 30-40 knots in that same region. thunderstorm
development is possible ahead of the shortwave with a more linear
mode expected with the shortwave later in the evening. the western
extent of this feature is still uncertain and could reach as far
west as cleveland. the highest confidence in thunderstorms currently
for this evening is across far northeastern ohio and in northwestern
pennsylvania. this is shown in spc`s day 1 severe weather outlook as
there is a slight risk (level 3 of 5) from a line from toledo
southeast to canton and eastward with higher probabilities for
severe winds in northeastern ohio and northwestern pennsylvania.
damaging winds will be the main threat with todays storms, though
large hail will also be a factor with the increased lapse rates and
instability. a quick spin up tornado is also possible though 0-1 km
bulk shear is minimal, so the threat is on the low end.
thunderstorms should exit to the southeast around midnight.
given the warm, moist environment over the region, pwat values
will be around 1.5-2.00" across the region. the will bring the
threat for heavy rain with any thunderstorms and could cause
isolated flooding issues if there are persistent rainfall over
and area.

additional thunderstorms are possible early thursday morning as well
though there is still a lot of uncertainty in where and the severity
of these as it will be dependent on the storms from wednesday
evening. a cold front will approach from the north throughout the
day on thursday that will bring more widespread precipitation to the
region. the severe weather threat will be more focused on central
ohio with the better instability and lapse rates, though can`t rule
out any storms to become severe across the region ahead of the
front. the front will be slow to move to the south and should exit
by late thursday night.

lingering showers and thunderstorms are possible friday as another
shortwave moves through the region, though the severe threat should
be lower than previous days. high pressure builds into the region
from the north and should persist through the weekend with dry
weather expected.

&&

.aviation /12z wednesday through sunday/...
several rounds of convection are likely this morning across ne
oh and nw pa as clusters of thunderstorms over lake erie come
ashore. strong to severe winds are possible with these storms,
as well as frequent lightning and hail. storms are expected to
move out of the area by late morning, but a second round of
scattered convection will develop this afternoon and evening
across in roughly the same locations. at this time, uncertainty
exists as to the exact timing and location of these storms.

the rest of the region will stay vfr with scattered to broken
high and mid level clouds. south and southwest 5 to 10 knots
are expected, with a few gusts to 20 knots during the afternoon
hours.

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...
severe storms have made their way across eastern lake erie and
into the coastal waters this morning, with several rounds of
storms likely across the lake today and tonight as a cold front
eventually drops south. wind gusts up to 40 knots are possible
in the strongest storms. outside of thunderstorms, southwest
winds with 1-3 foot waves are expected.

a gradual wind shift to the north will occur by thursday night
behind the cold front, with winds diminishing friday. northeast
flow over the weekend could result in some choppy conditions
with waves of 1-3 feet.

&&

.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...23
aviation...27
marine...10/27

Fulton and Henry Counties

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area forecast discussion
national weather service northern indiana
615 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 /12z tafs through 12z thursday/...
issued at 611 am edt wed sep 2 2026

existing tafs remain on track at this time. upstream convection
over ia and wi will send cloud debris through ksbn and, to a
lesser extent, kfwa during the morning hours. conditions look
mainly dry, but given the hot and humid conditions and perhaps
a lingering outflow boundary from ia, cannot completely rule out
an isolated thunderstorm this afternoon; confidence is low.

late in this taf period, after 06z, storms are expected to
develop over southern or central michigan and drift east-
southeast. a dry forecast continues, but this activity may need
to be addressed just beyond this taf period.

&&

.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
715 am edt wed sep 2 2026

.key messages...

- hot and humid today. a heat advisory is in effect for portions of
se mi.

- there will be a slight risk for severe weather today. most
favorable timing for severe weather will be this afternoon and
evening.

- additional shower and thunderstorm chances thursday and friday.

&&

.aviation...

a lull in thunderstorm activity looks to follow through this morning
with renewed thunderstorm chances arriving this afternoon first
across mbs and fnt again and then progressing southward into tonight.
uncertainty does exist with respect to coverage of any thunderstorm
activity heading into this evening and tonight across southern
terminals. have added a prob30 for the potential. predominately vfr
skies will prevail through bulk of today outside the morning fog and
any thunderstorms that would bring a reduction to mvfr or below vsbys
given the heavy downpour potential. cold front makes inroads from
the north late in the taf period.

d21/dtw convection...the best chance for thunderstorms is north of
dtw toward the northern fringe of d21 this afternoon, but
thunderstorm chances may develop after 00z this evening.

.dtw threshold probabilities...

* low for ceiling 5000 ft or less wednesday afternoon.

&&

.prev discussion...
issued at 345 am edt wed sep 2 2026

discussion...

ongoing convection across southern minnesota and central wisconsin
will continue to progress east-northeast through the morning, with
primary convective concerns holding across northern lake huron,
northern lower mi, and the u.p. very moist low-level conditions
remain in place across se mi with surface dewpoints in the low 70s,
which will support intermittent stratus and isolated showers through
the morning. showers or an isolated thunderstorm will be most
favorable along or north of m59 this morning.

for this afternoon, any lingering low clouds are expected to erode
quickly with enhanced boundary-layer mixing. with the projected
convection and thicker cloud canopies holding north of the cwa, h850
temperatures aoa 20c, and some early day sunshine, daytime highs
peak in the low 90s across a greater portion of the cwa. mixing may
temper the dew points slightly during peak heating, but the high
boundary layer moisture should still support heat indices aoa 100
degrees across southern michigan. this will be most favorable from
the mi/oh border and up through the m-59 corridor, noting the usual
enhanced potential across the urban metro corridor. as a result, a
heat advisory is now in effect from noon through 8 pm edt. conditions
still remain hot and muggy north of the advisory zones with heat
indices ranging in the mid to upper 90s. the higher potential for mid
to high level clouds and earlier arrival of potential showers and
storms (more below) precludes the issuance of heat advisories farther
north.

attention then turns to the potential influence of a convectively
generated outflow from the activity that is projected to traverse
across northern michigan this morning. this boundary would be slated
to arrive across the tri-cities and thumb late this afternoon and
evening, coincident with peak daytime heating. mlcape values between
2500-3000 j/kg along with strong kinematics characterized by bulk
shear values of 40-45 knots will be likely by the afternoon. any ci
generated off an outflow/pseudo cold front could result in organized
convection capable of generating strong to severe thunderstorms. the
greatest confidence for this scenario resides across the thumb where
several hi-res solutions depict a more pronounced southward-moving
boundary. this potential may extend west into the tri-cities for
initial development before progressing southward toward the i-69
corridor and port huron through the evening.

if strong to severe thunderstorms develop, storm mode may briefly
start as semi-discrete but would likely quickly amalgamate to multi-
cell clusters or a linear mode. strong 1-3 and 1-6km shear values of
30-40 knots could support supercell development with any initial
discrete formation under modest streamwise vorticity within the
midlevels. the likely hazards would likely be damaging wind gusts
with any bowing segments from cold pool generation or microbursts
given deep layer cape. large hail is also possible noting the cape
values and strong mid-level lapse rates. last, ml output does
highlight chances for a tornado, most favorable within the thumb.
uncertainty is higher with tornadogenesis. again any initial discrete
development would would make this possible noting 0-1km shear around
20 knots, but with current thinking hedged towards multi-
cell/linear, ambient shear profile would be altered. some guidance
suggests secondary boundaries capable of propagating farther south
into the evening through the metro region. however uncertainty is
higher in southern extent of any convection as timing of this
coincides with loss of daytime heating. overall, swody1 places all of
se mi in a slight risk for severe weather with all storm hazards
possible.

slightly cooler temperatures projected for thursday but very humid
conditions remain as dew points hold in the 70s. quasi-zonal flow
ushers in warm and humid conditions into the great lakes from the
plains, which will again support the chance for showers and
thunderstorms tomorrow. swody2 clips a portion of southern michigan
for a marginal risk for severe weather. persistence forecast holds
into friday, with the overall pattern starting to breakdown into the
weekend as ridge amplification commences across the plains.

marine...

a low pressure system over ontario will control 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 leading to additional rounds of storms possible
through tonight 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 through this morning.

hydrology...

a humid air mass will bring a chance of heavy rainfall within any
strong thunderstorm that develops. however, areal coverage and exact
timing remains elusive across lower michigan. periodic chances of
storms will exist right through friday. any strong thunderstorm will
have the potential to quickly produce 1-2 inches of rain, which can
lead to localized minor flooding of roads and poor-drainage areas.

&&

.dtx watches/warnings/advisories...
mi...heat advisory from noon today to 8 pm edt this evening for
miz068>070-075-076-082-083.

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

$$

aviation.....aa
discussion...am
marine.......drk
hydrology....am


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