Narrative:

I was training on the radar position on sector 30. Traffic was light and not complex. Aircraft X checked in westbound at FL340 and then shortly after I acknowledged the check in; he reported that he had just seen a weather balloon pass directly beneath his flight path about 1;000 feet below. The sector team had not been made aware that a weather balloon without a transponder was to be launched anywhere near our airspace; but it turned up on my boundary with another sector at approximately FL330. We notified the supervisor who was aware of the balloon but not the exact whereabouts because it was not equipped with a transponder. He did come back to the sector team with much more information about the balloon but after the aircraft had already reported passing over it. The pilot then advised me that he would recommend that we provide vectors to any other aircraft flying through the area. This is an unsafe situation because we have weather balloons that we cannot identify with the radar that are climbing and descending through air traffic without us having any knowledge of where they are actually at in real time or what altitude they are at. We were told that the operators had a waiver in which a transponder was not required because of the size; but the concern of the pilot leads me to believe that no pilot would want to hit one of those balloons cruising at fl 340. There is prescribed phraseology in the 7110.65 about unmanned balloon operations but the verbiage is vague; and ties our hands since a pilot can request a vector around the area where the balloon last was; but we don't know where it is in real time so we could actually be vectoring the aircraft in the path of the balloon without knowing it. Many people in the facility believe this to be a problem and we've seen many balloons go up and come down without issue; but after hearing the pilot's concern and myself and my trainer having no previous knowledge of it; I believe there need to be changes to the procedures regarding weather balloons.I believe that all weather balloons should be equipped with a transponder so we know the exact location and altitude because then we could actually provide a helpful vector to aircraft that request it. We can also advise aircraft more accurately.

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Original NASA ASRS Text

Title: ZDV Controllers reports that an aircraft under his control reported a balloon at FL350. The controller did not know anything about the balloon but the FLM was aware of the balloon.

Narrative: I was training on the RADAR position on sector 30. Traffic was light and not complex. Aircraft X checked in westbound at FL340 and then shortly after I acknowledged the check in; he reported that he had just seen a weather balloon pass directly beneath his flight path about 1;000 feet below. The sector team had not been made aware that a weather balloon without a transponder was to be launched anywhere near our airspace; but it turned up on my boundary with another sector at approximately FL330. We notified the supervisor who was aware of the balloon but not the exact whereabouts because it was not equipped with a transponder. He did come back to the sector team with much more information about the balloon but after the aircraft had already reported passing over it. The pilot then advised me that he would recommend that we provide vectors to any other aircraft flying through the area. This is an unsafe situation because we have weather balloons that we cannot identify with the radar that are climbing and descending through air traffic without us having any knowledge of where they are actually at in real time or what altitude they are at. We were told that the operators had a waiver in which a transponder was not required because of the size; but the concern of the pilot leads me to believe that no pilot would want to hit one of those balloons cruising at FL 340. There is prescribed phraseology in the 7110.65 about unmanned balloon operations but the verbiage is vague; and ties our hands since a pilot can request a vector around the area where the balloon last was; but we don't know where it is in real time so we could actually be vectoring the aircraft in the path of the balloon without knowing it. Many people in the facility believe this to be a problem and we've seen many balloons go up and come down without issue; but after hearing the pilot's concern and myself and my trainer having no previous knowledge of it; I believe there need to be changes to the procedures regarding weather balloons.I believe that all weather balloons should be equipped with a transponder so we know the exact location and altitude because then we could actually provide a helpful vector to aircraft that request it. We can also advise aircraft more accurately.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.