...CONTINUED HOT CONDITIONS WITH HEAT INDICES 105 TO 109...

Plan your trip Local Radar Detailed Forecast

Today: Mostly sunny early in the morning then becoming partly cloudy. A 40 % chance of showers and thunderstorms in the afternoon. Highs in the mid 90s. East winds 5 to 10 mph. Heat index readings 103 to 107.

Tonight: Partly cloudy. A 20 % chance of showers and thunderstorms in the evening. Lows in the lower 70s. Southeast winds 5 mph in the evening becoming light.

Forecast Details: sprawling upper high remains parked over Arkansas. 00z KJAX sounding showed subsidence inversion at 650mb. Mostly clear skies prevail across most of the area with temperatures ranging from the middle to upper 70s.

Upper high pressure is still prognosticated to weaken and retrograde during the next 48 hours. This will allow subsidence inversion to weaken. Flow in the middle and upper levels will become lighter as well and this will lead to more uniform distribution of thunderstorms during the afternoons and evenings. Convection will be almost entirely forced by seabreezes and boundary interactions. Due to the weak atmospheric flow locally heavy rainfall will be possible.

Temperatures and relative humidity values will combine to produce heat indices of 105 to 109 again over the next couple of days.

Today's Pollen Levels: 5.9 Medium (on a scale to 12); Predominate Pollen: Grass.

Did you know that... The United States was treated to a magnificent aurora borealis on this date in 1882. The aurora was visible from Oregon to Maine, and down to Florida.

For additional information visit the National Weather Service in Jacksonville website on the internet at http://www.srh.noaa.gov/jax/