Chicago Storm

With the tornadoes confirmed thus far with yesterday's derecho, the 2026 Illinois tornado count has now surpassed 200.

2 hours ago, A-L-E-K said:

should be a safe miss south for my, not to bummed and will be nice to see the wet get spread around a bit

Looks like I-90 on south, roughly.

10 minutes ago, Powerball said:

I have never seen a Tornado Warning that large in area before now...

that's environment canada-like.

1 minute ago, Stebo said:

This will push the state past 200, which I believe is a first for any state.

Texas has surpassed 200 a few times. But, IL will be the only other state to have.

5 minutes ago, MidwestChaser said:

 

hey, i said wait until morning.

15 minutes ago, Stebo said:

 

LSR from Aurora for 85mph measured at the airport.

Yea, just missed the real goods here by a few miles.

Peak wind gusts of just over 60MPH here as it moved through.

Incoming…

looks like the mcs is finally getting it's act together, just in time for the metro.

7 hours ago, Chicago Storm said:

development has occurred. we'll see how it trends the remainder of the night and into the morning.

the bigger issue may end up being upstream, actually. most guidance is doing a fairly bad job regarding the evolution of things across the dakotas and vicinity. most guidance suggested that mcs formation would come from supercells tracking across the dakotas this evening and tonight, paired with additional development as well. not only should that scenario already have been unfolding by now, but it seems to be out the window based on evolution in reality over the past few hours.

if this big mcs is going to come to fruition, it'll have to be from an entirely different process than most guidance had shown.

big guidance fail.

instead we had a cluster develop south of sioux falls.

now we have an mcs, which has struggled to mature and organize as it has crossed iowa all morning.

4 hours ago, Chicago Storm said:

i'd be really cautious buying into the big talk regarding tomorrow, until morning that is.

there's a subtle wave in the sioux falls region this evening, which will translate east overnight. it appears that we should see t'storm development ahead of this feature, along the diffuse boundary across iowa and n illinois tonight. if this activity becomes too significant or lingers too deep into the morning, the big mega derecho hype will fail hard.

development has occurred. we'll see how it trends the remainder of the night and into the morning.

the bigger issue may end up being upstream, actually. most guidance is doing a fairly bad job regarding the evolution of things across the dakotas and vicinity. most guidance suggested that mcs formation would come from supercells tracking across the dakotas this evening and tonight, paired with additional development as well. not only should that scenario already have been unfolding by now, but it seems to be out the window based on evolution in reality over the past few hours.

if this big mcs is going to come to fruition, it'll have to be from an entirely different process than most guidance had shown.

i'd be really cautious buying into the big talk regarding tomorrow, until morning that is.

there's a subtle wave in the sioux falls region this evening, which will translate east overnight. it appears that we should see t'storm development ahead of this feature, along the diffuse boundary across iowa and n illinois tonight. if this activity becomes too significant or lingers too deep into the morning, the big mega derecho hype will fail hard.

Had pea size hail at home with yesterday afternoon's round of activity.

The evening/night round of activity didn't amount to much, kind of splitting by north and south.

6 hours ago, A-L-E-K said:

nest with a goofy looking convective evolution 

it always struggles in these patterns.

While multiple rounds of severe t'storm activity occurred across the area yesterday, the most notable at ORD was the late afternoon round.

ORD had a peak wind gust of 64MPH with outflow that moved through ahead of that particular round of activity.

13 minutes ago, cmillzz said:

Chicago dodged what likely would've been its hottest day of the year thanks to today's storms. Rockford and Madison reached the mid-upper 90s under plenty of sun, and even Detroit ended up warmer. Pretty unlucky (or lucky) depending on how you view it, and also a really bizarre set-up.

The thermal ridge was north.

It's very doubtful that ORD would have topped the current highest of the year, which is 96° (7/14).

It hit 92° at ORD and 91° at MDW yesterday.

...2026 90°+ Day Tally...
13 - MDW
12 - ORD
12 - RFD
11 - PWK
11 - ARR
10 - UGN
10 - LOT
8 - DPA

An embedded sup is trying to from in NE IL, similar to what is occurring in SE WI.

2 hours ago, Old Dusty said:

To be expected. They got their eyes/ears and funding slashed.

literally not the reason they suck. (hint: they always have)

the spc is so bad.

Average highs start dropping now at ORD. The slow March towards fall has begun 

It’s currently 98/85/130 in Belleville, IL.

1 hour ago, Jonger said:

That MCS just took the smoke away. 

57 minutes ago, A-L-E-K said:

Seeing real blue again 

the smoke is still here.

still ranging between 3-8SM at all obs sites across ne il.

ORD and MDW ended up with 6 90°+ days during this heat wave, all consecutive.

...ORD...
July 13th: 93°/69°
July 14th: 96°/74°
July 15th: 95°/76°
July 16th: 91°/75°
July 17th: 92°/75°
July 18th: 91°/70°

...MDW...
July 13th: 92°/69°
July 14th: 96°/73°
July 15th: 95°/76°
July 16th: 91°/78°
July 17th: 94°/77°
July 18th: 91°/71°

It made it up to 91° at ORD and MDW on Saturday.