Heavy rain, tornado reported out west; shouldn't be as bad here

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Reader LorraRudman sends us the view looking south from her yard Saturday in Lincolnshire. See more photos and send us yours here.

By Tom Skilling

UPDATED 5:26 p.m. – Flooding rains and a funnel cloud are reported to Chicago’s west out of the Davenport, Iowa, National Weather Service Office, but it doesn’t look like those storms will be quite as severe once they reach the Chicago area. But there will be rain … and McHenry County probably gets it first.

A tornado was reported near Rock Grove Township in Illinois, near the Illinois-Wisconsin line northwest of Rockford.

Rainfalls from afternoon thunderstorms in Iowa include: 4 inches Springville, 3.05 inches Marion, 2.5 inches Mortelle, 1 inch just northwest of Cedar Rapdis, 1.08 inches DeWitt.

UPDATED AT 11:44 a.m. — Interesting day shaping up.

Atmospheric water content to build to 1.48 inches ((that’s the water evaporated in the air or what’s referred to as the “precipitable water”). What’s more, model energy calculations give us 1,000 j/kg CAPES — more than adequate to support thunderstorm formation.

Beyond daytime heating, another trigger will be an inland moving lake breeze.

Our in-house RPM bubbles some thunderstorms up along that this afternoon. There will be aerial coverage of perhaps 20-30 percent this afternoon/evening.

The rest of the week should also be interesting. We’ll flirt with 90-degree heat as thunderstorm organizing waves move from time to time around the periphery of a building dome of hot air — a classic ring of fire pattern. Rains are not continuous in such a regime but hit in regular waves. We’re watching for possible severe weather Wednesday night and Thursday.

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