Emergency Management Agency
Vermilion County, Illinois

Ted Fisher, Director
2507 Georgetown Road
Danville, IL 61832
Phone:  (217) 443-6010
Fax: (217) 443-6653
 

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Severe Weather Watches, Advisories & Warnings
 
Tornado Watch
Issued by the  Storm Prediction Center when conditions are favorable for the development of severe thunderstorms and tornadoes over a larger-scale region covering numerous counties or a large part of a state.  These are usually in effect for a period of 6 to 8 hours.
 
Severe Thunderstorm Watch
Issued by the  Storm Prediction Center when conditions are favorable for the development of severe thunderstorms over a larger-scale region. Tornadoes are not expected in such situations, but isolated tornado development cannot be ruled out. These are issued for numerous counties or a large part of a state, and are usually in effect for a period of 6 to 8 hours.
 
Significant Weather Advisory
Issued for strong thunderstorms with the threat for wind gusts of 40-55 mph and/or hail less than 1.00 inch in diameter. These are usually issued for a 60 minute time period.
 
Tornado Warning
Issued for counties or portions of a county when there is evidence based on radar or a reliable spotter report that a tornado is imminent or occurring. These are usually issued for 30 to 45 minutes in length.
 
Severe Thunderstorm Warning
Issued for counties or portions of a county when there is evidence based on radar or a reliable spotter report that a thunderstorm is producing, or about to produce, wind gusts  around 60 mph or greater, structural wind damage, and/or hail 1.00 inch in diameter or greater. These are usually issued for 30 to 60 minutes in length.
 
Severe Weather Statement
Issued for follow-up information on existing Severe Thunderstorm and Tornado Warnings. This can include actual severe weather reports, current radar information, and towns expected to be in the path of the storms. This statement is also used to cancel warnings, and to give follow-up information after a warning has expired.
 
Special Weather Statement
Used to alert the public to funnel clouds which form in non-severe weather conditions, which are not expected to touch down. It may also be issued periodically on a significant weather event that is expected in the next few days.