Illinois Weather Trivia for September 10th
- Most Illinois tornadoes tend to move from southwest to northeast at 30 to 40 mph. However, they can move as fast at 70 mph, especially in the spring. Most are small and short lived, with winds less than 100 mph. However, stronger tornadoes with 100 to 200 mph winds do occur. Tornadoes with winds over 200 mph are quite rare in the state, but have been known to occur; the last one was recorded in 1990.
- Volunteer weather observers are a significant part of the climatology program in the United States. Approximately 11,000 "cooperative observers", as they are called, take measurements daily of temperature, precipitation, and river levels. In the state of Illinois, there are approximately 300 cooperative observers, averaging about 3 per county.
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