...CONTINUED HOT CONDITIONS WITH HEAT INDICES AROUND 105...

Plan your trip Local Radar Detailed Forecast

Today: Partly cloudy with a 40 % chance of showers and thunderstorms. Highs in the lower 90s. South winds 5 to 10 mph. Heat index readings 99 to 103.

Tonight: Partly cloudy. A chance of showers and thunderstorms in the evening then a slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. South winds 5 mph in the evening becoming light. Chance of rain 30 %.

Scattered showers and thunderstorms will develop by the afternoon with the greatest coverage over interior areas of northeast Florida. Greatest threats with storms will be gusty winds and frequent lightning. Due to slow storm motion, locally heavy rainfall will be possible in storms.

The combination of hot temperatures and high humidities will produce heat indices around 105 degrees this afternoon. Individuals who must be outside are reminded to drink plenty of fluids.

Forecast Details: upper high northwest of of the area has shifted west to central Texas and weakened. TUTT low is located just east of the Bahamas. 00z KJAX sounding showed middle-level subsidence inversion has further weakened. Skies are clear across the area early this morning with temperatures ranging from the middle to upper 70s. Instability will increase over the next 48 hours as upper trough digs over the east Seaboard of the US and allows weak surface front to move southeast into south Georgia by early Saturday.

Dominant forcing for convection this afternoon will be seabreeze convergence over the interior. For Friday and Saturday shortwave energy from the northwest will enhance thunderstorm activity. Increasing southwest low-level flow will focus convection more toward east zones as Atlantic and Gulf seabreezes collide. Storm motion will be very slow during the short term with speeds averaging near 5 kts. Precipitation water values will increase through the period as well with values approaching 2.5 inches by Saturday. Locally heavy rainfall will be possible.

Today's Pollen Levels: 6.3 Medium (on a scale to 12); Predominate Pollen: Grass.

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