The Weather Service said,
"Widespread showers and thunderstorms are expected to develop through the late afternoon hours and persist through the evening hours this evening. These storms are expected to be slow moving and will produce heavy rainfall over some areas."
Flood Watch
National Weather Service Cheyenne WY
228 PM MDT Fri Jul 30 2021
WYZ108-118-119-310600-
/O.EXA.KCYS.FF.A.0001.000000T0000Z-210731T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Goshen County-Central Laramie County-East Laramie County-
Including the cities of Pine Bluffs, Cheyenne, and Torrington
228 PM MDT Fri Jul 30 2021
...FLASH FLOOD WATCH IN EFFECT UNTIL MIDNIGHT MDT TONIGHT...