Subtropical Storm Otto was named in the Atlantic today at 21Z (4PM CDT). Otto, seen here just east of the Bahamas, clearly has non-tropical characteristics especially in water vapor imagery:
Freezing temperatures have already been observed near the Ohio River:
Although not shown on the above chart, even Carbondale, IL had a low of 30F on the morning of October 4th (Monday), and 32F on the 5th. Mount Vernon, IL had a low of 28F on October 5th. Frost advisories for tonight include Cattanooga, TN and Knoxville, TN.A severe thunderstorm watch is active for western Colorado and a hurricane warning east of Florida.