Jacksonville is starting Thursday, July 30, under cloudy skies and temperatures near 79 degrees, but the relatively calm morning will not last. A Heat Advisory takes effect at 11 a.m., with heat-index values expected to reach 108 to 110 degrees before thunderstorms become more likely later in the day.
Heat Builds Before Thunderstorms
The high is expected to reach about 95 degrees, with west winds at 8 to 14 mph and gusts up to 21 mph. A slight chance of showers arrives before noon, followed by increasing shower and thunderstorm chances from noon through the afternoon; the overall rain chance is 70%, according to the National Weather Service in Jacksonville.
Downpours Could Bring Flooding
Storms may bring three-quarters of an inch to 1 inch of rain in Jacksonville, while a few stronger or slow-moving cells could produce much heavier totals in isolated spots. Forecasters also warn of strong downburst winds that could reach 40 to 60 mph, along with lightning, sudden heavy rain and localized flooding, especially near and south of the I-10 corridor.
Storm Chances Stay High Through Monday
Showers and thunderstorms remain likely Thursday evening, with a chance continuing into the overnight hours and temperatures settling near 75 degrees. Friday brings another hot, stormy day with a high near 93 and a 70% rain chance, while Saturday looks wetter still with an 80% chance of showers and thunderstorms.
The unsettled pattern continues Sunday and Monday, when highs should stay in the low 90s and storm chances range from 60% to 70%. Rain chances ease somewhat Tuesday and Wednesday, but afternoon thunderstorms remain possible, with highs in the low to mid-90s.
Heat Advisory Runs Through 7 P.M.
People spending time outside Thursday should drink plenty of fluids, take frequent breaks in shade or air conditioning, wear lightweight clothing and avoid strenuous activity during the afternoon peak. The National Weather Service also recommends checking on older neighbors, children and others vulnerable to heat; anyone showing signs of heat stroke should be moved to a cool place and emergency services called at 911.
