Another great weather tool is Twitter. I know, I know, Twitter, but there’s a lot of timely road and weather info supplied by government agencies like the National Weather Service and various state DOTs. As far as weather, I sub to regional NWS office Twitter feeds along our route. They typically post localized weather forecasts twice a day. The US map of NWS regional office can be found on the NWS site. From there simply subscribe to their regional Twitter feeds. It allows us to watch local weather and know up to the day when we need to move or not move. In February we were able to duck into Yellowstone between storms. We got out when a big snow storm was one day out and drove around the corner to Sheridan, WY and avoided snomageddon.
Another handy one is oss.weathershare.org.....of course it's not an app and you have to be online but it's great for planning or checking the morning before departure.....
So many clever travel and weather apps these days. What's perhaps overlooked is that each individual state can have quite unique and very different weather-related highway circumstances from the other states. AND a state DOT has an intimate knowledge of what the issues are for each of their roadways across all the seasons, let alone construction, damage and other near real-time operational details. So no matter the number of apps on my phone (good grief; they multiply at night!) I'll always be including the DOT websites &/or apps when traveling.
Here is a website that has all the DOT website links in one place. https://www.safetravelusa.com Just click the state on the map or scroll down for test links. :)