Issued by local National Weather Service Offices. These are issued when Doppler radar indicates rotation within a thunderstorm showing the storm could produce a tornado within the next few minutes. They are also issued if there is ground confirmation of a tornado on or near the ground. Tornado Warnings are generally issued about 15 minutes in advance of the storm arriving in your community, and they typically do not last longer than 30 minutes.
Issued by local National Weather Service Offices. These are issued when Doppler radar detects winds of 58 Miles Per Hour or more, or quarter size hail (0.75"), or if there have been reports of damage within a thunderstorm. Winds of this magnitude and hail of this size can easily bring down trees causing power outages and damage to vehicles and outbuildings. The immediate action is to get inside and stay away from windows and plan for power outages. Severe Thunderstorm Warnings are issued up to 15 minutes of the storm arriving at a particular location and can last up to an hour.
Issued by local National Weather Service Offices. These are issued when Doppler radar has detected 2 inches of rainfall over the past hour for a particular area. Rainfall of this rate will lead to excessive runoff from streams and roadways and cause life-threatening travel conditions. The immediate action is to drive slowly and if you see a large body of water on a roadway. remember the phrase TURN AROUND, DON'T DROWN. Flash Flood Warnings are issued when flash flooding is already occurring or is expected to begin shortly, and they can last for up to 5 hours.