Jacksonville is starting Thursday with mostly clear skies and temperatures in the mid-70s, but the calm opening will not last. Afternoon heat will push the mercury near 97 degrees, while humidity could make it feel as hot as 110 to 112 degrees across the city and much of Northeast Florida.
The National Weather Service Jacksonville has issued a Heat Advisory from 11 a.m. through 7 p.m. Thursday for Jacksonville and surrounding areas. Officials warn that the combination of high temperatures and humidity could cause heat-related illness, especially for people working or exercising outside.
Heat Peaks Before Afternoon Storms
Mostly sunny skies should hold through early afternoon, with southwest winds running 5 to 14 mph and gusts reaching 21 mph. Showers and thunderstorms may develop after 1 p.m., with a 50% chance of rain and rainfall totals generally between a tenth and a quarter-inch.
The strongest storms could bring frequent lightning, torrential downpours, localized flooding and sudden wind gusts of 40 to 60 mph. Slow-moving storms may cause problems in urban and low-lying areas, so outdoor plans should include a quick route to shelter before thunder arrives.
Storm Chances Rise Into The Weekend
Friday stays hot, with a high near 95 degrees and a 50% chance of afternoon and evening showers and thunderstorms. Saturday looks stormier, with a high near 93 degrees and a 70% chance of showers and thunderstorms, including the possibility of strong storms.
Sunday through Wednesday will remain warm, with highs in the low to mid-90s and daily chances for afternoon or evening thunderstorms. Rain chances ease to roughly 30% to 40% early next week, but the unsettled summer pattern is expected to continue.
Heat Safety Comes First
Drink plenty of fluids, stay in air conditioning when possible and avoid strenuous activity during the afternoon peak. Lightweight, loose-fitting clothing can help, and anyone showing signs of heat exhaustion should be moved to a cool, shaded place; heat stroke is an emergency requiring a 911 call.
Beach conditions should remain relatively manageable through the weekend, with low surf and an overall low rip-current risk expected. Even so, swimmers and boaters should head indoors immediately when lightning is nearby, while drivers should be prepared for sudden heavy rain and sharply reduced visibility.
