Yeah, when the first siren had sounded, there was no tornado on the ground. The second siren had a confirmed tornado on the ground. I would think that a confirmed tornado on the ground moving into Joplin would warrant the sirens being constantly ran until the tornado had passed. At least, that's how I would do it. Do the 3 minute siren for the warning or possibility of a tornado. Constant siren for a tornado on the ground.
Better yet, just sound a different type of siren horn pulse the second time, indicating the seriousness of the tornado warning (tornado sighted on the ground, or within in a certain distance). The cure would be these type of sirens as seen in this link:
Devastating tornado strikes Joplin, Missouri
in Weather Forecasting and Discussion
Posted
Better yet, just sound a different type of siren horn pulse the second time, indicating the seriousness of the tornado warning (tornado sighted on the ground, or within in a certain distance). The cure would be these type of sirens as seen in this link:
www.youtube.com/watch?v=FIDXV0e3uLI