COLUMBUS (WCMH) — Another wave of heat will send temperatures into the mid-90s,, with a rise in humidity that will push the heat index to near or a little past 100 degrees.
Soaring temperatures into the 90s, especially when coupled with high humidity, result in dangerous conditions if a person is not sufficiently hydrated.
The National Weather Service in Wilmington noted that in previous years the dew point was generally measured hourly and not sampled as frequently as it is today, so it is possible there was a comparable high reading or heat index in an earlier heat wave.
The NWS usually issues excessive heat warnings based on high temperatures and humidity reaching 105 degrees, coupled with warm nights that remain above 75 degrees
Based on NOAA’s heat index chart, a 90-degree day feels like 100 degrees at 60% relative humidity.
On a humid day, the body has more difficulty cooling efficiently, raising the risk of heat illness. The greatest risk impacts people with respiratory and heart conditions, children, and the elderly.
According to the Centers for Disease Control and Prevention, in an average year, about 700 people in the United States die from heat-related causes, and more than 9,000 are hospitalized due to heat-related illness.
During periods of dangerous heat, never leave pets and children inside a vehicle. Interior temperatures can quickly rise 20-35 degrees higher than the outside temperature. Drink plenty of water, take breaks if working outdoors, avoid strenuous activities, find shade or air conditioning, and wear lightweight, light-colored clothing.
The heat this week will ease a little on Thursday, as highs fall back into the mid-80s following the passage of a weak cold front. However, low 90s are expected to return by the weekend.
An excessive heat warning was in effect for much of Ohio last Tuesday and Wednesday for the first time since July 18-20, 2020.
The combination of heat and humidity last week created an oppressive “feels like” heat index of record 117 degrees at 6:45 p.m. on June 14, eclipsing the previous record of 116 on July 15, 1995.