Try
weatherunderground.com. They use a larger network of sensors to form their forecasts.
ALL of the big name weather networks use exactly the same forecast info from NWS. So, you won't find much variation, just pretty pictures for your location. Weatherunderground.com is different. While I imagine they use the NWS forecast as a base, they have a huge sensor network to make their information more accurate.
Tens of thousands of people have their own personal weather instruments (easily bought from the internet for a few hundred). Each of those has the ability to be connected to weather networks like weatherunderground.com. More sensors, better accuracy.
Two of those personal weather stations in our village give more accurate static readings than any of the big name networks. More at
weatherunderground.com/overview
... and Yes, summer days always start with a forecast of t-storms in the afternoon. That's simply the way summer weather is.