A fast-moving weather system will push through the state of Wyoming today.  The best chance for thunderstorm activity today will be in western and northern parts of the state, where we will see widespread showers and thunderstorms with heavy rain and flash flooding possible.  Central and eastern Wyoming will see mainly isolated thunderstorm activity later in the afternoon and evening, but we still cannot rule out heavy rain at times.  Expect partly sunny skies with very mild and close to average temperatures throughout the state today.  Daytime highs will remain in the 70's to mid 80's.  A large trough of low pressure will begin to cross the region on Friday, which will make heavy rain and thunderstorms likely throughout the state.