Did Global Warming Set Stage For Duluth Flooding?
Climate Central | June 22, 2012 12:51 p.m.
Here are some of the facts regarding the unprecedented and devastating flooding event that took place this week in Duluth. A cold front sparked slow-moving thunderstorms that repeatedly moved over the Duluth area between June 17-19, dumping between 8 and 10 inches of rain in a 24-to 36-hour period on Duluth and neighboring communities in Minnesota and Wisconsin. An all-time record 24-hour rainfall was set in Duluth, with 7.24 inches of rain falling during that period. The rainfall came during an already wet month in Minnesota, as the state rapidly lurched from drought conditions during the spring to suddenly having a precipitation surplus.
Temperatures were normal or below on the 19th and 20th – the days when the rain fell. The rain was triggered by cold air, not global warming.
The graph below shows all three inch rain events at Duluth, including the two last week. There was an 8.3 inch rainfall in one day in 1990, more than the sum of the two days last week.
In 1978 there was a 5.6 inch rainfall, more than either day last week. 1978 was one of the coldest years in Minnesota history. As usual, Heidi is just spreading propaganda.