It may be true. My local media is saying 70% chance Monday while the National Weather Service is saying 40%. But I don’t put any faith in any percentages. Even if chances are high, atmospheric conditions can keep it from raining a drop, and if you really take notice, it’s easy to find 80% days where the rain misses you entirely and 20% days where you get hammered by storms.
You might try going to weather.gov and typing in your zip code, then when the page loads click “forecast discussion” on the menu to the left. This is text released several times a day from meteorologists at your local NWS office explaining the weather and what they expect to happen. It can be kind of science heavy but even if you don’t understand that it can still give you a good idea of what’s going on and the amount of certainty in the short term weather forecast, and even the timing. If there are changes in the forecast, you’ll probably see it there before TWC.