What was the greatest cause of weather-related fatalities in the united states in 2008? what was the greatest cause of weather-related fatalities in the united states in 2008? what was the greatest cause of weather-related fatalities in the united states in 2008? what was the greatest cause of weather-related fatalities in the united states in 2008? what was the greatest cause of weather-related fatalities in the united states in 2008? what was the greatest cause of weather-related fatalities in the united states in 2008? what was the greatest cause of weather-related fatalities in the united states in 2008? what was the greatest cause of weather-related fatalities in the united states in 2008?