A week of 90-degree temperatures has claimed its first lives in Maryland.
The state Department of Health and Mental Hygiene said Friday that hyperthermia contributed to the deaths this week of two people in Baltimore County and one in Montgomery County. All three were 65 or older, and all had underlying health problems.
Health department spokeswoman Karen Black said all three were found in "very hot" environments in their homes. The department declined to release further details for privacy reasons.
"These deaths remind us how important it is to take precautions against harsh weather conditions such as the heat wave we are currently experiencing in our state," said Gov. Martin O'Malley in a news release. "We need to be mindful of our families, friends and neighbors and take the time to check on those who may need extra assistance."
The National Weather Service has reported temperatures in the 90s at Baltimore-Washington International Thurgood Marshall Airport every day since last Saturday. Thursday's official high reached 100 degrees for the first time since August 2007.
Friday's temperatures reached 93 degrees at BWI. And the forecast calls for more 90-degree highs at least through Monday.
There were six heat-related deaths in Maryland last summer. There were 17 in 2008 and 21 in 2007, the health department said.
High temperatures are especially dangerous for the elderly and the very young, who may have difficulty regulating their body temperatures, leading to heat stroke or heat exhaustion. People with diabetes, heart and respiratory conditions are also at higher risk, health officials said.
Heat stroke can be fatal, with body temperature rising above 105 degrees Fahrenheit. Onset can be rapid. Treatment involves lowering the body temperature with a cool bath or wet towels while emergency medical care is summoned.
Heat exhaustion can occur with a combination of prolonged high temperatures and dehydration. Victims experience weakness, nausea, leg cramps or headache. They may vomit or faint. Treatment includes liquids and rest in a cool area.
To avoid heat-related ailments, health authorities advise drinking plenty of water or fruit juices, wearing light, loose-fitting clothing, avoiding direct sun and wearing a hat and sunglasses.
Never leave children or pets in a car, even with the windows cracked, experts say. Check on elderly relatives and neighbors daily. And limit outdoor physical activity to the morning or evening when it is cooler.