 An excessive heat warning will begin at 11 a.m. and will last through 8 p.m. Forecasting a high of 102 today with heat index values around 110 through the middle of the afternoon. Now we have about a 40% chance for showers and storms to develop. Some of them could be strong to severe. The Storm Prediction Center has us in the level 2 out of 5 risk category. Damaging winds are a primary threat. More widely scattered showers and storms tomorrow as a cold front slides through, dropping temperatures and humidity late week.