Heat watches are issued when conditions are favorable for an excessive heat event in the next 24 to 72 hours. If you don't take precautions immediately when conditions are extreme, you may become seriously ill or even die. This warning generally is issued when the maximum heat index temperature is expected to be 105 degrees or higher for at least two days and night time air temperatures will not drop below 75 degrees. What's an excessive heat warning?Īn excessive heat warning is issued within 12 hours of the onset of extremely dangerous heat conditions, according to the National Weather Service. When the heat index reaches 105 degrees or higher, conditions can become dangerous for both people and pets. Increased moisture in the air limits the body’s ability to cool off through sweating. The heat index is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature. When high temperatures combine with high humidity levels, people feel hotter than the actual temperature, according to the University of Florida. Watch Video: Heat index, explained: This is how heat waves are measured Heat index: High temperatures, high humidity can be deadly combination The record high temperature for Jacksonville on this date is 102 degrees, set in 1942. The area saw high temperatures of 100 degrees in 20.įor the first 20 days of July, Jacksonville has recorded five days where high temperatures reached 98 degrees, helping to raise this month’s average high temperature to 95.1 degrees, compared to the normal average of 91.8 degrees. (The lowest high temperature for the month was 88 degrees on July 10.) Hot car death: Baker County infant dies after being left in hot vehicleĪccording to First Coast News meteorologist Lauren Rautenkranz, the warning is the first of its kind issued for Duval County and the first in the area issued since July 2012, when the National Weather Service issued and Excessive Heat Warning for areas of Southeast Georgia.įriday’s forecast high of 101 degrees would be the highest temperature recorded in Jacksonville since 101 degrees in July 2016, according to NWS data. Hot weather terms: What do heat warnings and watches mean? Terms you should know What you should know: Weather watches, warnings issued for Jacksonville area. In some areas, including western Duval County, it could feel hotter than 115 degrees today, the weather office said. Johns, Clay and Nassau counties, where it will feel like 110 degrees or hotter. With that forecast, the weather service’s Jacksonville office has issued an Excessive Heat Warning for portions of Northeast Florida and Southeast Georgia, including Duval, St. View Gallery: From fountains to pools, how Jacksonville beats the summer heatĪfter two consecutive days in which temperatures hit 98 degrees, the National Weather Service is forecasting an expected high of 101 degrees in Jacksonville.
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