Chicago bracing for risky heat wave — CITY OF NORTHLAKE

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- The National Weather Service has extended a Heat Advisory for Ohio County until 7 p.m. Sunday night.

High humidity coupled with soaring temperatures in the lower 90s will add up to a heat index - what temperatures feel like - in the upper 90s starting Sunday, according to Kennedy. The heat index should approach 100 on Friday afternoon and could get as high at 110 on Saturday afternoon.

The nearest cooling center may be found by calling 311, or visiting the city's "Beat the Heat" website. "Drink plenty of water, use air conditioning or go to an air-conditioned place, and avoid strenuous outdoor activity during the periods of intense heat".

Los Angeles, under the influence of a cool Pacific Ocean, is expected to reach only 78 on Independence Day, but the pain will come eventually, according to the National Weather Service.

The heat wave is now forecast to last through July 4 - at least. Residents are also asked to check on elderly neighbors and people with medical problems and to make sure that pets aren't left unattended.

"With this high humidity and heat, your body will struggle to keep its internal temperature regulated in the healthy zone", Meteorologist Mike Cameron said. The highest heat index values will be in the valleys away from the Lake Erie shore.

The heat index will be at or near 100 degrees across the Midwest and Northeast on Sunday. When there's extreme heat, the steel on moveable bridges like it expands, Mike Claffey with the Chicago Department of Transportation said.

SATURDAY: Hot and Humid, Chance for a late thunderstorm. "Excessive exposure to heat can cause a range of heat-related illnesses, from heat rash and heat cramps to heat exhaustion and heat stroke". If a victim is continuously vomiting or loses consciousness, call 911 or your local emergency number immediately. Take extra precautions.if you work or spend time outside. Wear lightweight and loose-fitting clothing when possible and drink plenty of water.

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