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If you鈥檝e seen a strange yellow buoy bobbing around Lunenburg Bay and wondered what it does, here鈥檚 your chance.

On Friday, scientists with the Centre for Marine Environmental Prediction (CMEP) will be at the Fisheries Museum of the Atlantic in Lunenburg and out on the water to talk about the instruments they use, the information they're聽gathering and what it's being used for. Called 鈥淭he Underwater Weather: Looking Beneath the Surface of Lunenburg Bay,鈥� the open house goes all day, from 9:30 a.m. to 5 p.m.

鈥淲e鈥檝e been on the water monitoring Lunenburg Bay since 2003 and there鈥檚 some pretty neat stuff going on,鈥� says St茅phane Kirchhoff, CMEP鈥檚 project manager.

The Underwater Weather: Looking Beneath the Surface of Lunenburg Bay WHAT: An open house by the Centre for Marine Environmental Prediction (CMEP) WHERE: The Fisheries Museum of the Atlantic, 68 Bluenose Drive, Lunenburg WHEN: Friday, Sept. 21, 9:30 a.m to 5 p.m.

CMEP brings together scientists from across disciplines (atmospheric science and oceanography) and research centres (pilipili漫画, Bedford Institute of Oceanography, Meteorological Service of Canada) to study the weather above and below the ocean鈥檚 surface.

Principal investigators for the $7-million project are John Cullen and Alex Hay, professors with Dalhousie鈥檚 Department of Oceanography. In the five years the centre has been operational, dozens of undergraduate and graduate students have helped by monitoring equipment and analyzing data.

鈥淭he weather in the ocean is intimately affected by the weather in the atmosphere,鈥� says Mr. Kirchhoff. 鈥淥ur monitoring and research should allow us some forecasting capabilities in terms of currents, circulation, wave height, storm surges and biological growth.鈥�

CMEP鈥檚 research is aided by some pretty cool instruments: three coastal buoys that measure meteorological conditions; acoustic pods that sit on the ocean floor and measure currents through the water column; and optical sensors that look at sunlight and how it penetrates the ocean. The buoys are powered by solar panels and transmit data every half hour directly to.

There are also two land-based meteorological stations: one on Cross Island that measures fog, and another at Battery Point at the entrance of Lunenburg Harbour that gauges air pressure, air temperature, wind speed, wind direction and precipitation. As well, there鈥檚 an offshore buoy located 25 kilometres from Halifax that takes measurements in the water column, including levels of carbon dioxide.

The information gathered from these instruments has a number of practical applications. For example, measurements from our sensors and national and international observing systems help to make forecasts of extreme events 鈥� information that could have left decision-makers better equipped to deal with weather disturbances such as Hurricane Juan.