Thunderstorm Watch:
A forecast of the possibility of severe weather. This could include dangerous lightning, damaging winds, hail, heavy rains, potential for flooding and the possibility of tornadoes. These storms may not be in the immediate area and may still be forming.
Thunderstorm Warning:
Indicates that a severe storm is in the immediate area. The storms could include dangerous lightning, damaging winds, hail, heavy rains, with the potential for flash flooding and tornadoes.
Tornado Watch:
Issued when the weather conditions are favorable for the development of tornadoes as well as severe thunderstorms. Much of the time tornadoes stem from the activity within severe thunderstorms.
Tornado Warning:
Issued when a tornado has been sighted or indicated on weather radar.
When a tornado warning is issued for Johnson County, Kansas, the tornado
sirens are sounded. These sirens are intended to be heard by people out
in the open, not inside their homes. Inside your home, use a NOAA weather
radio or monitor local radio or television to stay informed.
In the event a tornado warning is issued for your area find shelter quickly, preferably in a basement. A room without windows near the center of your home, under a sturdy piece of furniture, or a closet all make for good shelter in the event there is no basement available.
At work or school, stay away from large open rooms like gymnasiums or any area that has long roof spans. Do not attempt to go to your vehicle; it is safer inside. If you are inside your car during a warning, don't try to outrun the tornado. Find shelter under a bridge, in a depression or a culvert.
During severe weather season, the tornado sirens are usually tested on the first Wednesday of each month. These storm sirens are intended to be an outdoor warning device, and not intended to be relied on for people inside buildings. If you are inside and the sky starts to look threatening, it is best to tune to a local TV or radio stations for weather updates.
Check the city's Flood Warning System.