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National Weather Service Portland-Gray Maine

Upper-Air Program Virtual Tour
National Weather Service Forecast Office
Gray, Maine


Introduction Equipment Inflation Baseline Launch RRS Conclusion


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Once the radiosonde has passed through the baseline process successfully and the desired launch window has come (one hour prior to the desired flight time), the radiosonde is taken out to the upper-air building and launch area, and is attached to the sounding train. Since WFO Gray is not located within 5 nautical miles of an airport, we do not have to notify aviation interests in the area. WFO that are within 5 nautical miles of an airport must call the Federal Aviation Administration (FAA) Control Tower to receive clearance for the launch. The pictures below illustrate a typical balloon launch process. We will have a video of the launch process posted later this spring.

Preparing to release the Radiosonde

Preparing to release the Radiosonde



One of our meteorologist interns releasing the balloon on a cool February evening

One of our meteorologist interns releases the balloon on a cool February evening

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Gray Weather Forecast Office
P.O. Box 1208
Gray, ME 04039
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Page last modified: March 17th, 2009
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