The National Weather Service has issued a Severe Thunderstorm Watch for much of Wyoming, the area includes the cities of Cheyenne and Laramie. The Watch is in effect until 10:00 PM on Friday (August 23). Parts of the Nebraska Panhandle and extream southwestern South Dakota are also included in the Watch.

REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes. -NWS

NOAA / National Weather Service National Centers for Environmental Prediction Storm Prediction Center
   Severe Thunderstorm Watch Number 614
   NWS Storm Prediction Center Norman OK
   255 PM MDT Fri Aug 23 2019

   The NWS Storm Prediction Center has issued a

   * Severe Thunderstorm Watch for portions of 
     The western Nebraska Panhandle
     Extreme southwestern South Dakota
     Much of central and eastern Wyoming

   * Effective this Friday afternoon and evening from 255 PM until
     1000 PM MDT.

   * Primary threats include...
     Scattered damaging wind gusts to 70 mph possible
     Scattered large hail events to 1.5 inches in diameter possible

   SUMMARY...Thunderstorms are forming across central Wyoming and
   immediately east of the higher terrain into eastern Wyoming.  The
   storm environment is sufficient for supercells across central
   Wyoming, though growth into clusters with damaging winds and large
   hail should be the primary concern through late evening.

   The severe thunderstorm watch area is approximately along and 85
   statute miles east and west of a line from 25 miles east southeast
   of Cheyenne WY to 95 miles north northeast of Casper WY. For a
   complete depiction of the watch see the associated watch outline
   update (WOUS64 KWNS WOU4).