It was a day that came to be known as “Black Friday”. On July 31, 1987, one of the most powerful tornadoes in Canadian history struck Edmonton, Alberta and parts of Strathcona County. It is the deadliest known tornado for Alberta and the second-deadliest for the country. This significant tornado was given a rating of F4 with maximum winds estimated at 260mph.
On July 21, 1987, an F4 tornado tracked 24 miles across the Teton Wilderness into Yellowstone National Park. Over 1,000,000 trees were knocked down as the tornado slashed its way across mountain tops up to 10,000 feet high, and through valleys. This is the highest altitude in the US that a violent tornado (F4/F5) has ever occurred.
On July 18, 2004, 8 tornadoes touched down in North Dakota. This summary looks at the strongest, an F4 that annihilated a farmstead near Marion. This tornado produced what is arguably among the most intense damage from any tornado in the 2000s.
On the afternoon of July 28, 1936, two tornadoes hit Washington and Fayette Counties in Southwestern Pennsylvania. The twin tornadoes caused over $1,000,000 in damage. Two people were killed and at least 23 others were injured, in the rampage. We estimate these tornadoes reached F3 intensity at their peak.
On July 21, 2003, a derecho moved across portions of Ohio, Pennsylvania, into New York and New England. Per the SPC, it spawned 20 tornadoes. The focus of this summary is of the strongest tornado of the outbreak, the Ellisburg PA, F3. Two people were injured when the funnel leveled a farm.
On July 14, 2004, there were 11 tornadoes reported by the SPC. This summary takes a look at the strongest tornado of the day, an F3 that hit Central Pennsylvania. 100 homes were damaged or destroyed in the town of Campbelltown.
This devastating event began at Cooks Valley, about 2 miles west of Bloomer. The tornado clipped the NW part of the town. Approximately 50 homes were demolished. 100-150 other homes and businesses sustained damaged. The tornado traveled a total of 19-20 miles.