Common Weather Alerting Terms

Tornado Watch

Tornado watch means that conditions are favorable for a tornado to develop. Those in or near the watch area should:

Check your preparations for severe weather and take necessary precautions.
Be alert for rapid changes in weather conditions.
Monitor local radio, television networks, or your weather alert radio.
Consider postponing travel.

Severe Thunderstorm Warning

A severe thunderstorm warning means that a thunderstorm is occurring that rates a severe classification. Remember: Though the warning may "only be for a severe storm," by definition severe storms have characteristics that can pose a danger to people and property, including the ability to produce tornadoes at any time.

Take cover.
Monitor your local radio and television networks for further details.
Avoid travel until the warning expires.

Severe Thunderstorm Warning During a Tornado Watch

A severe thunderstorm warning (a severe storm is occurring) with a tornado watch (conditions are right for tornadoes to form) indicate that dangerous weather is occurring and has even greater potential to become even more extreme.

Take cover.
Monitor weather very closely.

Destructive Weather Warning

A destructive weather warning is issued by the National Weather Service when winds over 80mph and/ or 2.75-inch (baseball-sized) hail is/are expected. In the event a destructive weather warning is issued, St. Charles County Regional Emergency Management personnel will activate the Outdoor Warning Sirens.