A code red extreme heat alert has been issued for Monday through Thursday as temperatures are expected to exceed 100 degrees Fahrenheit, officials said.

"As Baltimore continues to experience very high temperatures this week, all residents should take precautions to protect against hyperthermia and dehydration," Baltimore City Health Commissioner Dr. Leana Wen said. "Heat is a silent killer and a public health threat, particularly for the young, the elderly and those with chronic medical conditions. I urge everyone stay cool, stay hydrated, and stay in touch with your neighbors, especially seniors and medically frail individuals who live alone."

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A Code Red Extreme Heat Alert has been issued for Tuesday with the heat index expected to rise above 100.

The heat index combined both air temperature and relative humidity. The National Weather Service has issued a heat advisory and it will be in effect from noon to 7 p.m. Tuesday.

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Schools that do not have air-conditioning in Baltimore City will dimiss three hours early on Tuesday, Sept. 4. Officials made the announcement on Monday, Sept. 3, the day before school was to start.

More than 50 schools will be closing three hours early because city school officials say they lack sufficient air-conditioning.

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