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The City and County of Denver has made great efforts to manage these events and mitigate their paralytic potential. However, it is easy for some people to become complacent to the threats these hazards pose to life, property, health, and the economy.
Temperatures are rising across the country and many cities are feeling the heat of 100 degrees or more. With the addition of humidity, some areas will begin to experience extreme heat. During extreme heat, it is important to stay cool.
Extreme heat causes more deaths than hurricanes, tornadoes, floods and earthquakes combined. Heat related illnesses occur when the body is not able to compensate and properly cool itself. The great news is extreme heat is preventable by following a few tips:
Flooding has historically been a hazard to the City and County of Denver. Past flooding along the streams in Denver has been well documented by the Corps of Engineers and the Urban Drainage and Flood Control District.
Hailstorms rarely involve physical injury, but their economic impact can be severe. In 1990, the hailstorm that struck the metro area resulted in approximately $750 million in damages alone. It ranked as the most expensive hail related incident at that time in the country. The damage from hail in Denver can be an annual event. However, new materials for roofing are slowly mitigating the damage from hail.
The atmospheric discharge of static electricity in a bolt of lightning has four principle effects:
It should be noted that more people are killed by lightning each year in Colorado than in any other weather related phenomena.
Currently, based on reports filed under Title III of the Superfund Amendment Re-authorization Act (SARA Title III), there are approximately 400 facilities storing reportable quantities of hazardous material on sites throughout the city.
In addition to fixed storage sites, hazardous materials are transported along the I-70 and I-25 highway corridors, which pass through densely populated areas of the city. Fire House Magazine has placed the Denver Fire Department Hazmat Response Unit among the top ten busiest units nationwide over the last seven years.
Tornadoes are the most widely feared and publicized natural hazards in Colorado. During 1996, a total of 96 tornadoes occurred in Colorado, heightening concerns that these powerful phenomenons may be increasing to cataclysmic frequencies. The metro area, in particular, serves as a site for the development of severe thunderstorms. Due to the "Denver Cyclone" effect, severe spring weather is a major concern for Denver. These storms create cloud to ground lightning strikes, heavy rain with flooding potential, severe hail, and tornadoes.
On June 15, 1988, a group of tornadoes passed over the metro area. Two areas of the city suffered heavy damage due to tornado touch downs. On June 2, 1993, an F-1 rated tornado struck Denver. According to the National Weather Service, there have been 11 tornado touch downs in Denver between 1950 and 1989. The Fujita scale rates intensity of tornadoes with F0 for weak storms with wind rotation below 73 mph, and F5 for violent storms with rotation speeds of 261 to 318 mph. Fortunately, the tornadoes in the Denver area are usually rated F0 to F1 (with rotation speeds of 73 to 112 mph).
While the tornadoes that occur in Denver are relatively weak compared to those in the Mid-West, the potential for injury, loss of life and property damage remains high. Most injuries that occur in these events are the result of flying debris, especially broken glass. The tornado threat is with us every spring, and is extremely high during the months of May, June and July. The intensity of these events and the potential for damages and injury should not be underestimated.
For example, the average snowfall for September is 1.7 inches, yet in 1936 Denver received 21.3 inches. Snow storms like this, and those in early spring, produce heavy wet snows that break tree limbs and down power lines. Along with snowfall, Denver can also experience extremely cold temperatures, dropping 25 degrees below zero or lower with the wind chill factor. The threat of severe winter storms including cold temperatures and heavy snow, is well documented and even expected in Denver.