“There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact.”
― Mark Twain
This week in 1871 brought the deadliest fires in US history. On October 7, 1871 much of Minnesota and Wisconsin were burning.
PRAIRIES IN FLAMES. – One Hundred and Fifty Miles Swept by Fire–Men, Women and Children Fleeing for Their Lives–Immense Loss of Property of all Kinds. Several Towns Destroyed–Great Damage Occasioned–Loss of Life. – View Article – NYTimes.com
The following day Chicago burned to the ground, and many other towns around the Great Lakes in flames.
There were massive fires in Wisconsin, Michigan and the Rocky Mountains.
The worst of these fires occurred at Peshtigo, Wisconsin, where more than one thousand people burned to death.
But the reality is – they knew they were going to be driven from town six days earlier.
Here is what really happened.
From 1870 to 1871, the Midwest was engulfed in drought. Peshtigo and the surrounding area, which normally gets a meter or two of snow, got almost none that winter. The spring and summer also brought lighter than normal precipitation. Historical records mark the date of the last soaking rain before the fire as July 8, leaving the slash to bake in the dry air for another three months through summer and early fall.
In early October, a cyclonic weather front formed over the Great Plains, creating westerly winds that headed toward Peshtigo. When the storm hit the Northwoods on Oct. 8, a huge temperature difference created strong winds, kicking up coals and fanning the smaller fires, which merged into one enormous fire. A wall of flame nearly 5 kilometers wide and almost a kilometer high roared through the town and quickly spread, according to survivor accounts.
Based on the vitrification of sand, the fire was estimated to have reached more than 1,000 degrees Celsius. It burned so intensely that it created its own weather system, with winds whipping the fire into a tornado-like column of fire and cinders. Authors Gess and Lutz reported that winds rushed through the town at more than 160 kilometers per hour. Escape routes were limited; outrunning the fire was impossible. Many survivors used the same phrase to describe the speed of the flames: “faster than it takes to write these words.”
via Real Climate Science
October 4, 2021 by tonyheller