 The National Weather Service in Grand Junction has issued a flash flood warning for northwestern Gunnison County in west central Colorado, west central Pipkin County in west central Colorado, until 6.30 p.m. Mountain Daylight Time. At 4.29 p.m. Mountain Daylight Time, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Flash flooding is ongoing or expected to begin shortly. Hazard, flash flooding caused by thunderstorms.