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Chicago Storm

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    2026 Severe Wx - General Thread

    in Lakes/Ohio Valley

    Posted

    To be fair, there was one severe cell that did go up.
    I'm pretty sure it hinged upon surface convergence along the outflow / differential heating boundary from the early day MCS in Northern WI / MI being sufficient enough for widespread initiation, and it was close as several other cells did attempt to go up.
    But hey, it happens. And it just shows how sensitive the potential is in such a moisture-laden / high instability / weakly capped environment.

    na, it was just a horrible md and outlook adjustment. nothing supported it, not even the wofs that they specifically referenced.

    the area was capped, there was no boundary nor anything to force development across eastern iowa or northern illinois.
    • Thanks 1

    2026 4th of July Heatwave

    in Lakes/Ohio Valley

    Posted

    SUPER localized scouring out and mixing in parts of the metro area currently.

    All sites are carrying a 70+ DP, except for ORD and UGN, which have been running in the low to upper 60's. ORD has a current DP of 63, with 70 at MDW. ORD also has the highest area temp currently at 95.

    I cross-checked things with our back-up units here, and they are right on par with the lower DP and are actually running a bit warmer with the temp at 97.

    2026 4th of July Heatwave

    in Lakes/Ohio Valley

    Posted

    We’re finally seeing earlier and better mixing locally today.

    Monday and yesterday really didn’t start mixing until later afternoon. Today it has been all day, and it looks to be more thorough now, with DP’s bouncing between 66-70° currently.

    With that, today should feature the peak high temp of this stretch. Tomorrow would have a shot as well, if not for increased cloud and outflow potential.

    • yes 1

    2026 4th of July Heatwave

    in Lakes/Ohio Valley

    Posted

    30 minutes ago, hawkeye_wx said:

    DVN had 95 for us today.  We hit 90.

    Under-mixing.

    It always seems to be the issue in these set-ups.

    Edit: Looks like the 0z and 12z HRRR 'only' had a high of 91, so it seems overzealous DVN was just being its usual self.

    • Like 2
    • Haha 1

    2026 4th of July Heatwave

    in Lakes/Ohio Valley

    Posted

    It's unfortunate that the ridge center trended east over the past several days.

    We could have had a shot at 100 locally with it better positioned further west, and we also likely would have prolonged the heat wave as well prior to ROF potential.

    2026 Severe Wx - General Thread

    in Lakes/Ohio Valley

    Posted

    42 minutes ago, MidwestChaser said:

    Again with the late city addition to the watch. Why does the SPC kept doing that; so dumb. 

    i came here hoping to see this...didn't let me down.

    most of the time there's watch collab, so may be the spc or lot.

    Chicago Weather Records Tracking

    in Lakes/Ohio Valley

    Posted

    2 hours ago, Brian D said:

    Joe, since your tracking 90dF+ days each year, thought I'd look at the longer period stns on your list, and graph the yearly counts as reference. Unfortunately, MDW has a 15 yr gap.

    ORD 90dF plus days chart.gif

    MDW 90dF plus days chart.gif

    RFD 90dF plus days chart.gif

    Thanks for posting that. It gives a good visual of the trends over time.

    It also reminds me that we're due for a clunker.:banned:

    • Like 2
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