(UPDATE 6/11/17 7:38 pm-) The Tornado Warning has been allowed to expire.
The National Weather Service has issued a Tornado Warning in the Casper area, and surrounding Natrona County until 7:30 pm 6/11/17.
The NWS says that radar has indicated rotation. A severe thunderstorm, capable of producing a tornado, was located over Evansville at 7:04 pm. Moving Northeast at 20 mph.
The NWS advises to take cover now, move to a basement or interior room on the lowest floor of a sturdy building. Avoid Windows. If you are outdoors, in a mobile home, or in a vehicle, move to the closest substantial shelter and protect yourself from potential flying debris.