|FUJITA SCALE||DERIVED EF SCALE||OPERATIONAL EF SCALE|
|F Number||Fastest 1/4-mile (mph)||3 Second Gust (mph)||EF Number||3 Second Gust (mph)||EF Number||3 Second Gust (mph)|
***IMPORTANT NOTE ABOUT ENHANCED F-SCALE WINDS:
The Enhanced Fujita Scale, or EF Scale, is the scale for rating the strength of tornadoes in the United States estimated via the damage they cause.
Implemented in place of the Fujita scale, it began operational use on February 1, 2007. The scale has the same basic design as the original Fujita scale, six categories from zero to five representing increasing degrees of damage.
It was revised to reflect better examinations of tornado damage surveys, so as to align wind speeds more closely with associated storm damage. Better standardizing and elucidating what was previously subjective and ambiguous, it also adds more types of structures as well as vegetation, expands degrees of damage, and better accounts for variables such as differences in construction quality.
A tornado watch is issued when conditions are favorable for a tornado to occur.
Remain alert for approaching storms.This is time to remind family members where the safest places within your home are located, and listen to the radio or television for further developments.Be prepared to seek shelter.
A tornado warning is issued when a tornado has been sighted in the area.
Immediately seek safe shelter.
PRIOR TO THE THREAT
Before you are faced with the threat of a tornado, plan now and be prepared.
Last Updated: June 8, 2016 11:48 AM
CEMA encourages everyone who lives, works and visits Savannah and Chatham County to sign up to receive CEMA Alerts through the Community Notification System. You can receive CEMA Alerts on your cell phone through text messages, through your email and also on your home phone. Click here to get started, or you can text “Add 2641748” to the phone number 99538. You should immediately receive a text from Swift911 saying that you are now subscribed to 1 CEMA Alert.×
The Chatham Emergency Management Agency conducts monthly tests of our emergency warning sirens on the first Wednesday of each month at 12 noon. If you hear a siren at any other time, it means take cover! Read more about our warning siren program.×