Yes. The National Weather service issues tornado warnings if a tornado has been spotted or may develop very soon.
Yes. Tornado warnings are now a common part of severe weather alerts.
no
In the U.S. tornado warnings are issued by local offices of the National Weather Service.
Last year in 2011, there were over 1800 tornado reports (of which about 1700 were confirmed), but the number of tornado warnings was higher as not all warnings correspond to a formal report. So the number of warnings issued in 2011 was likely well over 2000. However, 2011 was an extremely active tornado season. An average tornado season sees about 1200 tornadoes in the U.S., which would likely work out to about 1800-2000 warnings.
The National Weather Service issues Tornado Warnings as well as Watches. This is also true for Severe Thunderstorm Warnings and Watches.
In developed nations such as the U.S. yes. Tornado warnings are broadcast through television, radio, the internet, and some smartphone apps. In some towns sirens will sound during a tornado warning.
Most tornado warnings are usually based on data from Doppler radar, which can indicate a strong mesocyclone or even the signature of a tornado itself, and on reports from spotters, who may report if a tornado is forming or already on the ground.
Yes. In most cases a warning is issued before a tornado strikes.
No. Tornado warnings did not exist at the time. Such warnings did not begin until the 1950s.
Not really. Although there were some attempts at warnings during that general time period, no warnings were issued for the Waco tornado, largely due to failures in communication. The Waco tornado served as a catalyst to develop a warning system.
Berwyn, PA can get tornadoes and thus tornado warnings. Answers.com cannot provide real-time information on tornado warnings. For that information you should go to the official website of the National Weather Service. For potential weather emergencies you should purchase a battery-powered weather radio.
they tell you to get ready for the tornado be safe get away from windows, etc! They help u be ssafe