(WSIL) -- Hazy skies and a few clouds have been enough to keep afternoon temperatures down a bit during the past few days. Humidity levels continue to tick up and will through the weekend. Pop-up storms are possible starting tomorrow but the overall chance of rain is less than 20%. Weekend heat index values could climb into triple digits. More hot humid conditions are expected late next week. The biggest chance of rain I see arrives Monday with some strong storms possible. I will have the latest forecast updates on News 3 WSIL.