Dr. Jeff Masters' WunderBlog
It was another day of triple-digit heat across the Midwest Thursday, as the nation continued to bake in the intense heat of the record-breaking summer of 2012. Chicago hit 103ï½° on Thursday, just 2ï½° below the city's all-time hottest temperature of 105ï½°, set on July 24, 1934. The Windy City might have exceeded their all-time heat record, but for the fortuitous formation of a small but intense thunderstorm that hit the airport at 2:45 pm. The storm brought a wind gust of 52 mph to the airport and cooled the temperature by 20ï½°. A wind gust of 92 mph was recorded 4 miles offshore over Lake Michigan. Thursday was the hottest day in Chicago since a 104ï½° reading on July 13, 1995. Milwaukee, WI also hit 103ï½° Thursday, which tied for the 3rd hottest temperature in city history. Madison's 104ï½° was their hottest day since 1988, and also tied for the 3rd warmest temperature ever measured in the city. Madison's all-time high is 107ï½°, set July 14, 1936. St. Louis hit 105ï½°, the eighth consecutive day the city has hit triple digits. This streak is now the 3rd longest such streak in city history; the only longer streaks occurred during the Dust Bowl summer of 1936 (streaks of 13 and 9 days.) The current forecast for St. Louis calls for highs of 107 - 108ï½° Friday and Saturday, which will likely bring the city's streak of 100ï½°+ days to ten by week's end. St. Louis' all-time hottest temperature is 115ï½°, set in 1954.
"As AccuWeather meteorologist Brian Edwards explained to ABC News, the destructive weather that hit the Washington, D.C. area was caused by a rare occurence known as a "derecho," which forms "when an atmospheric disturbance lifts the warm air in regions experiencing intense heat, causing thunderstorms and hurricane-force winds to develop."
Dr. Jeff Masters writes on WunderBlog that "Friday's derecho was one of the largest and most destructive in U.S. history."
I'd like a derecho with my latté, please.