MADE IN THE USA 
Testimonial:
“We’ve had very little bad weather here which is quite unusual. We’ve only had 2 thunderstorms since July. The few times when there were storms out there, the unit has worked great!”
US Coast Guard, Connecticut
“We’ve had very little bad weather here which is quite unusual. We’ve only had 2 thunderstorms since July. The few times when there were storms out there, the unit has worked great!”
US Coast Guard, Connecticut
Lightning Safety Tip:
Types of Lightning and How ThunderBolt® will Respond
ONLY CLOUD-TO-GROUND LIGHTNING IS A THREAT TO LIFE!
Cloud-to-cloud lightning is the most common lightning, accounting for almost 80% of all lightning strokes. It can light up the sky and clouds, and may be accompanied with an audible, low rumble of thunder, and/or rain (rain only storms do not constitute a dangerous storm situation and will not register on a ThunderBolt®). This type of lightning can be deceptive to the human eye, and may have the appearance of deadly Cloud-to-Ground lightning, but just looks dangerous.
Cloud-to-ground lightning is a lightning discharge between a cumulonimbus cloud and the ground. There are several types, but all are dangerous. This type of lightning can strike without any visible or audible warning. Statistically, 30% of all lightning injuries and fatalities occur from the front edge of a storm (typically before anyone has seen lightning or heard thunder), and 60% occur from the backside of the storm (when it appeared safe to return outdoors).
Anvil-to-ground (Bolt out of the Blue)
This lightning produces a stroke emanating from the anvil shaped cloud, often
in a horizontal direction then veering toward the ground. This can occur miles ahead of the storm, striking without warning in what might still be a clear blue sky.
Read more about Bolt out of the Blue »
How ThunderBolt® responds
ThunderBolt® recognizes both Cloud-to-Cloud and cloud-to-ground lightning, but will react only to the user when it detects a cloud-to-ground stroke, which confirms that a real thunderstorm is occurring.
In the beginning, it may be difficult for you to distinguish between what may appear to be Cloud-to-Ground lightning but is really Cloud-to-Cloud lightning, but you will acquire the ability to tell the difference through continued use of ThunderBolt®.
Remember, In-Cloud lightning may appear to be close and dangerous and may appear like Cloud-to-Ground because of its spectacular appearance in the sky, but trust ThunderBolt® to warn you if it's Cloud-to-Ground lightning.
CALLING OR DELAYING GAMES BECAUSE OF FALSE LIGHTNING WARNINGS ARE BOTH COSTLY AND UNNECESSARY MISTAKES. ThunderBolt® WILL NOT FALSE TRIGGER FROM CLOUD-TO-CLOUD LIGHTNING.
You won't mistakenly call a game with ThunderBolt®. For example, you may think a storm is dangerously close, while ThunderBolt® indicates real storm activity 20 miles or more away. ThunderBolt® will tell you when to take cover. Continued use of the ThunderBolt® will build your faith and trust in its state-of-the-art technology.
If you have any doubt about your unit's performance in the beginning, play it safe and call our Technical Support for evaluation.
ONLY CLOUD-TO-GROUND LIGHTNING IS A THREAT TO LIFE!
Lightning Examples
In-cloud lightning 
Cloud-to-cloud lightning 
Sheet lightning 
Cloud-to-ground lightning
Cloud-to-cloud lightning: What is it?In-cloud lightning Cloud-to-cloud lightning Sheet lightning Cloud-to-ground lightningCloud-to-cloud lightning is the most common lightning, accounting for almost 80% of all lightning strokes. It can light up the sky and clouds, and may be accompanied with an audible, low rumble of thunder, and/or rain (rain only storms do not constitute a dangerous storm situation and will not register on a ThunderBolt®). This type of lightning can be deceptive to the human eye, and may have the appearance of deadly Cloud-to-Ground lightning, but just looks dangerous.
- Cloud to Cloud lightning does not generate Cloud-to-Ground strokes.
- It may or may not be a prelude to a storm.
- It appears much closer than it really is because it illuminates the sky, and often occurs in much higher clouds than Cloud-to-Ground lighting.
Cloud-to-ground lightning is a lightning discharge between a cumulonimbus cloud and the ground. There are several types, but all are dangerous. This type of lightning can strike without any visible or audible warning. Statistically, 30% of all lightning injuries and fatalities occur from the front edge of a storm (typically before anyone has seen lightning or heard thunder), and 60% occur from the backside of the storm (when it appeared safe to return outdoors).
Anvil-to-ground (Bolt out of the Blue)
This lightning produces a stroke emanating from the anvil shaped cloud, often
in a horizontal direction then veering toward the ground. This can occur miles ahead of the storm, striking without warning in what might still be a clear blue sky.
Read more about Bolt out of the Blue »
How ThunderBolt® responds
ThunderBolt® recognizes both Cloud-to-Cloud and cloud-to-ground lightning, but will react only to the user when it detects a cloud-to-ground stroke, which confirms that a real thunderstorm is occurring.
In the beginning, it may be difficult for you to distinguish between what may appear to be Cloud-to-Ground lightning but is really Cloud-to-Cloud lightning, but you will acquire the ability to tell the difference through continued use of ThunderBolt®.
Remember, In-Cloud lightning may appear to be close and dangerous and may appear like Cloud-to-Ground because of its spectacular appearance in the sky, but trust ThunderBolt® to warn you if it's Cloud-to-Ground lightning.
CALLING OR DELAYING GAMES BECAUSE OF FALSE LIGHTNING WARNINGS ARE BOTH COSTLY AND UNNECESSARY MISTAKES. ThunderBolt® WILL NOT FALSE TRIGGER FROM CLOUD-TO-CLOUD LIGHTNING.
You won't mistakenly call a game with ThunderBolt®. For example, you may think a storm is dangerously close, while ThunderBolt® indicates real storm activity 20 miles or more away. ThunderBolt® will tell you when to take cover. Continued use of the ThunderBolt® will build your faith and trust in its state-of-the-art technology.
If you have any doubt about your unit's performance in the beginning, play it safe and call our Technical Support for evaluation.
© 2012 ThunderBolt International, Inc.