(AP) — Autumn storms are threatening much of the Midwest, dumping heavy snow in South Dakota, spawning a tornado in Nebraska and threatening possibly dangerous thunderstorms from Wisconsin to Oklahoma.

The storm system that has raced through eastern Nebraska spawned a tornado that, though rare for an October day, is not that unusual.

National Weather Service meteorologist Barbara Mayes says the tornado was first spotted just after 10 p.m. Thursday, two miles east of Hickman in Lancaster County. The twister roared northeast into or near the towns of Bennet and Palmyra (pal-MYE’-ruh) before lifting up.

Thursday night’s twister damaged homes and businesses in several communities, knocked out power and felled trees. No injuries have been reported.

A foot of snow had already fallen in the northern South Dakota’s Black Hills early Friday.

John Chamberlain with the National Weather Service in Rapid City tells South Dakota Public Broadcasting that the storm is one of most intense fall storms in a long time in the area. No travel was advised on some western South Dakota roads and some schools canceled classes.

Other states in the storm’s path include Minnesota, Iowa, Kansas and Missouri. Even Texas could be impacted.

In South Dakota, as much as 30 inches of snow could fall in the Black Hills, with 12 inches on the plains.

The National Weather Service says there’s a likelihood of another damaging storm system moving into eastern Nebraska on Friday. Forecasters say the highest tornado threat appears to be in northeast Nebraska and west-central Iowa.