Hazards

Local Weather Hazards
This map updates in real-time when a Warning is issued by the National Weather Service. The page itself will not updated however so a refresh is required to ensure the latest image is observed. The map operates from a program called Weather Message, which pulls data from EMWIN (Emergency Manager Weather Information Network). As soon as it receives an update it is immediately pushed both to our social media accounts and to this map.

Explanation Between Watch, Warning and Advisory
The map will show all Watches, Warnings, and Advisories issued both by the Storm Prediction Center and the National Weather Service. It is very important to know the difference because not all of them require immediate action, but preparation.

Watch

Tornado
Severe Thunderstorm
Issued by the Storm Prediction Center. A Tornado Watch is issued when conditions are favorable for the development of severe thunderstorms that could produce tornadoes. Tornado Watch can be issued up to 3 hours in advance of any development, and can last up to 6 hours long.
Issued by the Storm Prediction Center. A Severe Thunderstorm Watch is issued when conditions are met for thunderstorms that could reach severe criteria - which is defined as 1 inch hail or 58 MPH winds. Severe Thunderstorm Watches can be issued up to 2 hours in advance of actual thunderstorm development and can last up to 6 hours.

Flash Flood
Areal Flood
Issued by local National Weather Service Offices. Flash Flood Watches are issued when periods of heavy rainfall are expected that could lead to widespread instances of flash flooding. Flash Flood Watches can be issued up to 24 hours before a heavy rainfall event.
Issued by local National Weather Service Offices. Areal Flood Watches are issued when episodes of heavy rainfall are expected that may lead to nusiance flooding but widespread flash flooding is not expected.

Advisory

Significant Weather
Dense Fog
Indicates "nusiance" or "inconvient" These are typically issued for strong storms that are below severe limits but may still produce winds up to 50 MPH, heavy rain, frequent lightning etc.
Issued when sudden reductions in visibility have been reported or are expected. When this Advisory is in effect visibilities may suddenly drop to 1/3 of a mile or less.

Warning

Tornado
Severe Thunderstorm
Flash Flood

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.

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