2007 Elie tornado

Prior to the event, 1200 UTC 500-mb mesoscale analysis revealed the presence of a building upper ridge over the southern Prairies region of Canada, specifically in the southern Alberta and Saskatchewan regions, with a minor shortwave trough accompanying this ridge over Alberta. A thermal ridge was also noted in the southern Saskatchewan area, preventing storm formation and increasing heating in the upper atmosphere. Winds contained within a jet max at 800 hPa reached 10-15 m s⁻¹ (22-34 mph) as they rounded the western half of a high pressure ridge situated over the High Plains. This intense jet stream continually advected moisture from the Gulf of Mexico, allowing any developing storms to have access to large amounts of inflow. The directional and magnitudinal change of wind with height, known as wind shear, was also observed during this time, further contributing to an environment favorable for storm development.^[8]

At the surface, multiple disconnected lows were present, with one surface low over southern Saskatchewan featuring a warm front that extended to the east, into the Interlake region of the province of Manitoba. Due to this low, warm temperatures and high dew point values were advected into the region, increasing instability in the atmosphere. By 1800 UTC, this surface low had moved east and positioned itself directly over Dauphin Lake, with surrounding temperatures reaching 26-28°C (79-82°F), and dew points skyrocketing to 18-20°C (64-68°F). At this time, a significant elevated mixed layer (EML) remained over the area, preventing convection and storm activity but allowing for instability to continue to rise. By 2100 UTC, the area of low pressure had finally migrated to the southern basin of Lake Manitoba, and remained quasi-stationary for hours, with the Elie tornado initiating off of a dry line ahead of a cold front that extended from the low. It is noted that a cold pool and gravity waves may have affected the development of the Elie tornado, as well as other tornadoes in the surrounding area.^[8]

The tornado initially touched down north of the Trans-Canada Highway at around 6:25 p.m. CDT (23:25 UTC)^[9] and slowly moved southeast, where it picked up and overturned a semi-trailer and a tractor trailer. The tornado gradually turned east, took a sharp turn south, and then took another sharp turn east, all within roughly 1 mile (1.6 km). The tornado made another turn south and made an extremely slow loop over the town's flour mill at F2 intensity, causing over $1 million in damage. Multiple semi trucks were overturned and damaged and building walls buckled inward. At this point, the tornado was producing F1 to F2 level damage and had grown to a width of 50 m (55 yd). From there, it headed south parallel to Janzen Road at F0 intensity. It also continued to grow in width, reaching its peak width of about 140 m (153 yd). After reaching the intersection of Janzen Road and Road 61 North, the tornado turned east directly towards the southwest edge of Elie. It quickly intensified to F4 strength while it made a loop over Elie Street, as it began to severely damage multiple homes along this street. One of these homes, which was described as well-built and bolted to its foundation, was completely removed from its foundation and lofted into the air by the tornado, where it then collapsed into pieces as it was thrown around the tornado's funnel, justifying F5 intensity. The tornado also sheared some sill plates from this home and snapped off the bolts that supported these sill plates.^[4] Trees were debarked as well. Two other houses sustained F4 level damage, with both of them being almost completely swept from their foundations. One other house to the west also sustained F2-F3 level damage, with the entire roof torn off and multiple exterior walls collapsed. The tornado also flipped and threw multiple cars, including a car that was tossed over 100 meters, and even tossed one homeowner's Chrysler Fifth Avenue onto a neighbor's roof.^[10][11] The tornado lingered over this area of Elie for approximately four minutes before it exited Elie to the southwest and rapidly dissipated.^[4]

The tornado traveled about 6 km (3.7 mi) and was 150 yards (140 m) wide at its widest during its 35-minute lifespan. The tornado repeatedly struck the same area of town, destroying most of the structures and vehicles in the area. A video of the tornado shows an entire two-story home being wiped off of its foundation and tossed 75 feet (23 m) in the air, before rotating around the tornado and then being destroyed. Also seen on the video was a three-quarters-of-a-ton (1,500 LB) GM van filled with drywall that was lofted by the tornado and tossed hundreds of feet. At least three houses are seen being destroyed on the video, along with many more structures and vehicles being damaged. In other videos, the flour mill in Elie is also shown being damaged by the tornado, with bins and roofs being destroyed.^[12]

Since residents in Elie were prepared and took the necessary precautions during the event, there were no injuries or deaths reported. The following day, Environment Canada sent out a storm damage survey team from the Prairie and Arctic Storm Prediction Centre to assess the damage caused by the tornado. On September 18, 2007, the tornado was upgraded to F5 on the Fujita scale from the original F4 rating based on video analysis of the tornado and reassessment of the damage.^[3] This was the first tornado in Canada to be officially rated as such, making it the strongest confirmed tornado in Canadian history. It was one of only two F5/EF5 tornadoes that year (the other being a large and destructive EF5 tornado that struck Greensburg, Kansas on May 4), and it is one of only eleven tornadoes to be rated F5/EF5 since the 1999 Bridge Creek-Moore tornado. At the time, Canada had not adopted the Enhanced Fujita scale, which explains why the tornado received an F5 rating despite happening after the release of the Enhanced Fujita scale in the United States.^[13] It was mentioned by surveyors, however, that the Elie tornado was an EF5-equivalent tornado and could have received an EF5 rating if the enhanced scale were in use in Canada at the time.^[14]

• 2007 Southern Manitoba tornado outbreak
• Tornadoes of 2007
• List of Canadian tornadoes and tornado outbreaks (since 2001)
• List of F5, EF5, and IF5 tornadoes
• 1997 Jarrell tornado – Another slow-moving, erratic, and extremely intense tornado that impacted the town of Jarrell, Texas in May 1997
• List of notable media in the field of meteorology