It may seem crazy to talk about severe weather on a day when it’s snowing, but big thunderstorms are coming right around the corner. Colorado is no stranger to tornadoes. In fact, 13 years ago on May 22nd, 2008, a powerful tornado, rated an EF-3 on the Enhanced Fujita scale, moved through portions of northern Colorado. The tornado cut through Windsor, CO on its 39 mile path, leaving behind a path of destruction, at least 78 injuries, and one fatality. Damage estimates exceeded $100,000,000 from this tornado. While large tornadoes are not as common along the Colorado Front Range as they are across the Eastern Plains, they are possible given the right conditions. The location was not the only oddity with this significant tornado; the tornado moved from southeast to northwest. Only a small minority of all tornadoes move northwest. Also, the tornado formed just before noon, well before the usual time frame when tornadoes are most common. Tornadoes typically form during the afternoon to early evening hours across Colorado.
The tornado threat in Colorado increases rapidly in May and continues through August. Ninety percent of Colorado tornadoes occur during this four month period, but tornadoes have been reported as early as February and as late as November. On average, Colorado experiences 53 tornadoes annually.
Tornadoes have occurred in most areas of the state, but historically 95% of tornadoes occur along and east of Interstate 25 where heat and moisture in the lower atmosphere are often more abundant. Tornadoes can occur at every hour of the day, but most occur between 1pm and 8pm.
Across the country, about 90% of tornadoes are considered weak with winds less than 110 mph. About 10% of tornadoes are considered strong with winds up to 165 mph. Strong tornadoes are responsible for nearly 30 percent of tornado deaths. Violent tornadoes account for only 1% of all tornadoes, but they result in nearly 70 percent of all tornado fatalities because they destroy much of what is in their path.