A spring storm swept east across Wyoming, Friday resulting in various weather conditions including a small tornado in Sublette County. According to the National Weather Service Riverton office, showers and a few thunderstorms pushed east into western Wyoming during the predawn hours Friday. Heavy snow occurred above 9000 feet and Togwotee Pass became slick and snowpacked early Friday morning. Isolated thunderstorms continued Friday afternoon with most of the thunderstorm activity generally south of a Jackson. Then about 12:30 pm, a weak thunderstorm pushing east off the Wyoming Range into the Upper Green River Basin spawned a weak tornado that impacted Marbleton, tearing a portion of a roof from a manufactured home, destroying a travel trailer and downing power lines. Power outages of a short duration resulted. The weather service reports that the twister was on the ground for about a tenth of a mile and was rated as an EF-0.