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  • Writer's pictureThe San Juan Daily Star

No relief: Excessive heat advisory in effect through Sunday


According to the National Weather Service, extreme heat, with heat indices reaching or exceeding 111 degrees, will be observed on the island every afternoon until Sunday, especially in urban and coastal areas.

By The Star Staff


The National Weather Service (NWS) in San Juan issued an extreme heat watch, which was in effect until 5 p.m. Thursday, and an excessive heat advisory from 5 p.m. Thursday through Sunday.


Heat watches are issued when conditions are favorable for an excessive heat event in the next 24 to 72 hours. A watch is used when the risk of a heat wave has increased but its occurrence and timing is still uncertain.


A heat advisory is issued within 12 hours of the onset of extremely dangerous heat conditions. The general rule of thumb for this advisory is when the maximum heat index temperature is expected to be 100° or higher for at least two days, and night time air temperatures will not drop below 75°; however, these criteria vary, especially for areas that are not used to dangerous heat conditions.


According to the NWS, extreme heat, with heat indices reaching or exceeding 111 degrees, will be observed every afternoon until Sunday, especially in urban and coastal areas.


From Thursday afternoon until Friday afternoon, high temperatures were forecast, according to the notice.


The combination of high temperatures and high humidity can create dangerous situations in which heat-related illnesses are possible.


Additionally, abundant sun will amplify the effects of high temperatures.


The NWS recommends taking extra precautions, especially if you work or spend time outdoors.


“Know the signs and symptoms of heat exhaustion and heat stroke,” the NWS warned. “Wear light, loose-fitting clothing when possible and drink plenty of water. Never leave small children or pets alone in vehicles under any circumstances.”

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