Matthew Cappucci
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Atmospheric scientist, storm chaser, adventurer, teacher, author. Senior meteorologist at
@MyRadarWX
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@Washingtonpost
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Genuinely curious what Nadocast is seeing that I’m not…

Sure, I could see a discrete cell or two pop, but between higher cloud bases and quick upscale growth, it just seems like a long shot.

Anyone else have thoughts?
*Weeklong severe weather sequence begins today*

May is peak tornado season, and we’re about to see a dramatic uptick in severe weather across the central and eastern United States.

Here’s a general rundown of what to expect – and when.
1 hour and 40 minutes later, I’m back.
Apparently maintenance does not start their day until 7 AM so I can’t get in until then
Going back to bed. I will try starting my day when the universe is ready for me and my wonderfulness.
Don’t try me today, people. The hotel waffle maker is broken.
Media is too big
VIEW IN TELEGRAM
Maintenance does not appear to have showed up at work so I will not be getting into my hotel room any time soon.
Apparently the batteries on my door died so now I’m waiting for maintenance so I can eat my not waffle 😂
Thursday, May 15 — severe weather outbreak potential over Upper Midwest, Great Lakes region.

A few tornadic supercells will be possible in Wisconsin, Illinois and Indiana, including around the Chicago metro area. Coverage will be greatest in northern zones, with only widely-scattered storms — if that — in central/southern Illinois, Indiana and perhaps western Ohio.

Low pressure over Minnesota is scooping north warm, humid air. It’s also pulling a cold front into that juiced-up air mass, causing storms. And our low has kinked the jet stream overhead, adding wind energy to the atmosphere.

Given the environment, characterized by an overlap between robust instability (storm fuel) and spin, there’s the potential for one or two significant (EF2+) tornadoes. However, we’re not sure how widespread storms will be.

That’s because of a cap, or a lid of hot, dry air a mile above the ground. That cap might prevent surface air from rising, suppressing storm growth and cutting back on coverage.
Classic “Tornado Alley” supercell events likely Saturday/Sunday/Monday/Tuesday…

This weekend, it appears a “dryline” will set up along or west of the Interstate 35 corridor. That dryline marks the clash between dry desert air west and moisture-rich Gulf air to the east. It’s the clash that brews storms — especially with several jet stream disturbances working overhead.

Saturday’s storm could affect parts of Texas, Oklahoma and Arkansas.

By Sunday, the threat becomes more expansive — north Texas, Oklahoma and Kansas. It’s *possible* that only isolated storms form, since the approaching upper-air disturbance will still be a bit far away to the west, banked up over the Rockies.

On Monday, that upper-level low gets closer. That’s why storms will increase in both areal coverage and intensity, becoming at least scattered by the afternoon. The upper-level low will also kink the jet stream southwards, causing a dip (called a trough).