Yesterday marked the 148th anniversary of an astounding weather event.
California, like other regions, experiences occasional hot, dry winds; that is, when the air heats up due to downslope compressional heating. In Southern California these are called “Santa Ana winds,” while in Colorado, “Chinook winds” and in Bavaria, “Föhn winds.” In the deserts of North Africa, the Arabic word “Simoon” applies.
What causes these winds? Short answer: insolation, advection and the adiabatic heating process. Sorry, Al, you can’t blame this event on SUVs or carbon footprints.
June 17, 1859 – The only ‘simoon’ ever to occur in the United States
is reported by a United States Coast Survey vessel off Goleta. A
northwest wind brings scorching temperatures of 133 degrees between
1:00 and 2:00 that afternoon. Birds fall from the sky, crops shrivel
and cattle die under the shade of oak trees.
The record 133° temperature has been discredited since that time due to the thermometer having been in direct sunlight. However this vivid description from A History of the Aguajitos Ranch paints a picture that the temperature must have come very close to that:



