Winter Storm
The technology could help reduce the risk of flash flooding after a major storm.
Erika could threaten the East Coast early next week.
Danny is expected to become a hurricane by Thursday.
WHAT'S HAPPENING
Even places that normally don't see wintry weather are set for cold hit, according to the old secret formula.
Your umbrella will probably be useless in one of these.
Fifteen people are also injured, authorities say.
"Waking up the next day and seeing all the damage was heartbreaking."
Keep an eye on the skies, Illinois--it's officially tornado season in the Midwest and other tornado-alley states, which usually runs between March and June. But over the past few years, more tornadoes have touched down in Illinois outside of this timespan than during the peak spring season.
When the power goes out, here's what to do.