Safety Yellow Storm Whistle - World's Loudest, Can Be Heard Underwater
The Storm® All-Weather Safety Whistle is the loudest whistle on the market. Its unique patented design allows it to be heard under water, up to 50 feet, because the sounding chamber forces all water to be purged when the whistle is blown. Made in the USA. It's perfect for divers, lifeguards, and for recreation! Creates a clear, high frequency sound, with a power rating over 75% greater than other referee and safety whistles.
The Storm whistle is twice as loud as any other mouth-blown whistle in the world. Initial testing was conducted by the Hearing Conservation Programs Inc., who tested the decibel rating of various military, sports and survival whistles against the Storm whistle. These first tests were performed in a sound proof booth at a distance of 15 feet with the whistle being blown by mouth, and had a number of variables, such as the person blowing the whistle and the accuracy of the sound level devices.
The second set of tests, conducted by the Central Institute for the Deaf, were performed in open air at a distance of 15 feet, 25 feet and 50 feet. Here the whistles were attached to a constant air source which was adjusted to the normal blowing strength typically generated by the mouth. The sound the whistles made was then analyzed by computer, using a double blind technique, detailing the amplitude and signature of the sound created.
With a standard whistle, nonproductive high frequency (over 5000 hertz) and nonproductive low frequency (below 2000 hertz) sounds are created. Because of the patented harmonic chamber that is unique to the Storm whistle, these high and low frequency sounds are recycled and focused into our extremely loud single 3150 hertz frequency of double the standard amplitude.
The focused 3150 hertz frequency was generated intentionally in accordance with government recommendations that showed that the 3150 hertz tone is the most readily heard over the noise of motors, crowds, and explosions.
In all these cases, test results showed the Storm whistle as being twice as loud as the other whistles.
Presently, the Storm whistle is being used by these groups as a personal alarm where an extremely loud alarm is necessary:
Special Forces Fort Bragg, North Carolina
U.S. Dept. of Agriculture
U.S. Dept. of the Interior
U.S. Coast Guard, Washington, D.C.
U.S. Naval Destroyer, U.S.N.S. John Ericsson
U.S. Aircraft Carrier, U.S.S. Enterprise
U.S. Army Troop Support Avionic Command, St. Louis, Missouri
Park Forest Police Dept., Park Forest, Illinois
Yuba City Police Dept., Yuba City, California
Emergency Survival Systems, Sunnyville, California
Disaster Solutions, Venice, Florida
Dive Rescue, Fort Collins, Colorado
New York Police Department
Chicago Police Department
Fort Worth Police Department
Atlanta Police Department
American Red Cross
1) How do the All-Weather Safety whistles make so much noise?
In the 1850s, Dr. Hermann von Helmholtz invented the Helmholtz Resonator, a devise that could capture sound waves. Through utilizing the Resonator, Helmholtz discovered that the size of the cavity affected the sound waves. To use a modern-day example, if one throws a tennis ball into a very large room, the ball will simply roll to a stop. Likewise, if the chamber is extremely small, then the tennis ball will be immobile. However, if the room is "just right," then the tennis ball will bounce off of the walls in the chamber, rebounding successfully. These principles of sound augmentation and amplification had never been applied to whistles or alarms until Dr. Howard Wright invented the Storm Whistle in 1988.
2) Do the All-Weather Safety whistles really work underwater and how does that work?
Yes, the All-Weather Safety whistles really do work underwater. As a matter of fact, Dr. Wright invented the All-Weather whistle for just that reason. When he was just fourteen years old, Dr. Wright built the first Storm whistle so that he and his friends could play "tag" underwater. In order to make a standard whistle work underwater, he encased the whistle in a plastic box. When the box filled with air,the whistle worked. After further testing, Dr. Wright proceeded to make the plastic box smaller and smaller until he discovered that the sound producing area of a whistle was a small 5mm x 5mm area over the whistle exit opening. With this information, Dr. Wright was able to create a prototype that would function while submerged.
Today, the Storm whistle is used by dive clubs to organize multidiver events and to signal a fellow diver while underwater. The ability of the Storm whistle to work while wet is even more important for boaters and rescue individuals, as standard whistles will not work if they have been submerged. This is why Navy Rescue boats, hundreds of thousands of boaters, and search and rescue teams across the world demand the power and waterproof nature of the Storm and Windstorm whistles
3) Where can I buy the Storm and Windstorm whistles?
See our purchasing page for information on buying the Storm and Windstorm whistles.
4) How loud is the Storm whistle?
The loudness of the Storm whistle was measured in a soundproof chamber by a research team at the Institute for the Deaf in St. Louis Missouri. The Decibel reading varied between 118 and 120 dB. We compared the loudness of the Storm whistle, Windstorm whistle and a number of our competitors' whistles. The Storm whistle was nearly twice as loud as any other whistle. The Windstorm whistle was not quite as loud as the Storm, but was clearly louder than any of the competitors. Below, a graph illustrates the loudness of the All-Weather whistles vs. the competitors at a determined flow rate and at a given distance from the receiver.