Edmonton tornado

1987 tornado in Alberta, Canada

Weather forecasts issued during the morning and early afternoon of July 31, 1987 for Edmonton revealed a recognition by Environment Canada of a high potential for unusually severe thunderstorms that afternoon. Environment Canada responded swiftly upon receipt of the first report of a tornado touchdown from a resident of Leduc County which is immediately adjacent to Edmonton's southern boundary.

In the week preceding July 31, a low pressure system sitting over southwestern British Columbia fed warm, humid air into central Alberta. Daytime heating along with near record dewpoints over Alberta triggered a series of strong thunderstorms that persisted throughout the week. On July 31, a cold front developed over western Alberta, colliding with the warm moist air that persisted over the region. Forecasters recognized the elevated risk for severe weather early in the day. Weatheradio broadcasts and interviews with the media stressed "vicious thunderstorms" and "extremely strong and violent thunderstorms". Severe thunderstorms developed rapidly over the foothills early in the day and quickly moved eastward. The first severe weather watches were issued over central Alberta late in the morning and continued early in the afternoon. At 1:40 pm, a severe weather watch was issued for the Edmonton area, including Leduc County, Parkland County, and Strathcona County. The watch was later upgraded to a warning at 2:45 pm as the line of storms approached the area. As the cluster of storms approached the Leduc area, a violent cell rapidly developed ahead of the main line of storms and sharply turned northward. The storm passed east of Leduc, where the first tornado was reported by a weather spotter at 2:59 pm. The tornado was on the ground briefly before dissipating. Shortly after 3:00 pm, the tornado again touched down in the Beaumont area, tossing granaries and farm equipment as it grew in size and strength. At 3:04 pm, a tornado warning was issued for the city. The tornado moved into the southeast portion of the city as a multiple vortex tornado, and tracked north along the eastern portions of Mill Woods, causing F2 to F3 damage. The tornado continued northward crossing the Sherwood Park Freeway and eventually hitting the Refinery Row area at F4 intensity. The tornado tossed several large oil tanks, levelled several industrial buildings, and several trailers were picked up and scattered at Laidlaw and Byers Transport. Grass scouring and windrowing of debris occurred, and damage in that area may have been borderline F5, but was never officially ranked as such. The tornado weakened slightly as it passed over an open area between Baseline Road and the North Saskatchewan River. Still, it maintained F2 to F3 intensity as it tore through eastern parts of Clareview toward 4:00 pm, causing heavy damage to several homes in Kernohan, Bannerman and Fraser neighbourhoods. Farther from the Edmonton area, an F2 tornado touched down in farmland between Millet and Vegreville and remained on the ground for , causing $40,000 in damages. The warning system breaks into private and public broadcasts on radio, television and cable systems. It alerts the public for all disaster hazards that threaten to strike with little or no warning. The warning system is also used for issuing Amber Alerts. The tornado had also resulted in the first implementation of the Doppler weather radar concept in Canada in the early 1990s. Edmonton's Carvel radar was one of only three Dopplers to exist in Canada at the time. It later became part of the Canadian weather radar network, which was Dopplerized starting in 1998.

The song "Tornado '87" by The Rural Alberta Advantage, on their 2011 album Departing, was inspired by singer Nils Edenloff's experience as a child surviving the tornado.