On Friday, Gov. Mark R. Warner (D) declared a state of emergency. Virginia officials said the storm spawned 30 tornadoes in their state alone, far exceeding the number Virginia usually records in a year. In 2002, the most recent year for which figures are available, Virginia recorded seven tornadoes and Maryland had 14, according to the National Climatic Data Center.

http://www.washingtonpost.com/wp-dyn/articles/A31868-2004Sep18.html