Narrative:

Aircraft X departed hpn on the westchester 7 departure. Aircraft X was issued 2000 feet on departure because lga final is supposedly over our airspace at 3000 feet. Hpn airspace extends to 2999 feet so that's their claim that the aircraft for lga are above our airspace (like we can even measure that 1 foot exactly is absurd). Anyway on departure aircraft X started climbing past 2000 feet saying he was responding to windshear on a right turn of 320 degrees where he should have been maintaining 2000 feet but was instead climbing to 3000 feet now directly towards a aircraft Y going to lga because well they own that 1 extra foot of airspace even though our normal SID at hpn is 3000 feet on departure. I quickly informed aircraft X that he was climbing directly at the aircraft Y at 3000 feet. He responded immediately that he was descending and a potential midair collision was averted. I do not know how many times I have report this particular problem. This is by far the closest to a midair collision that I have ever seen. I have been complaining about this issue for a long time. Honestly aircraft X should not have been in a position that he can't respond to windshear and aircraft should have had a safe clear path to lga. The pilots deserve safety as due the passengers deserve safety! [A nearby airport] gets their departures stopped due to overflights and since they get to ride on the count of those overflights they get to be a big bad level 9 tower despite getting stopped and twiddling their thumbs. Hpn doesn't stop; we run traffic with that questionable 1000 foot buffer. We don't get counts for those overflights because we don't own that 1 foot of airspace! Should an arrival to lga descend out of 3000 feet or our departure climb above 2000 feet there is a huge potential for loss of life. Even our Prop1 departure is a joke for single engine props keeping our departures on runway 16 from turning into our arrivals because it doesn't address the twin props that turn just as sharp as single engine props. We should be a part of this bravo airspace of lga with redesigned airspace to better safely move traffic. I keep hearing nothing can be done... I keep hearing how we are behind on elms and that we can barely get a communication for safety class going; but really instead of these semi useless check a box stuff why can't we sit down and figure some important stuff out and not just give us new equipment that tries to get us to walk away from our position.

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Original NASA ASRS Text

Title: HPN Tower Controller and Gulfstream flight crew reported an altitude overshoot and airborne conflict when the flight crew responded to a windshear warning.

Narrative: Aircraft X departed HPN on the Westchester 7 departure. Aircraft X was issued 2000 feet on departure because LGA final is supposedly over our airspace at 3000 feet. HPN airspace extends to 2999 feet so that's their claim that the Aircraft for LGA are above our airspace (like we can even measure that 1 foot exactly is absurd). Anyway on departure Aircraft X started climbing past 2000 feet saying he was responding to windshear on a right turn of 320 degrees where he should have been maintaining 2000 feet but was instead climbing to 3000 feet now directly towards a Aircraft Y going to LGA because well they own that 1 extra foot of airspace even though our normal SID at HPN is 3000 feet on departure. I quickly informed Aircraft X that he was climbing directly at the Aircraft Y at 3000 feet. He responded immediately that he was descending and a potential midair collision was averted. I do not know how many times I have report this particular problem. This is by far the closest to a midair collision that I have ever seen. I have been complaining about this issue for a long time. Honestly Aircraft X should not have been in a position that he can't respond to windshear and Aircraft should have had a safe clear path to LGA. The pilots deserve safety as due the passengers deserve safety! [A nearby airport] gets their departures stopped due to overflights and since they get to ride on the count of those overflights they get to be a big bad level 9 tower despite getting stopped and twiddling their thumbs. HPN doesn't stop; we run traffic with that questionable 1000 foot buffer. We don't get counts for those overflights because we don't own that 1 foot of airspace! Should an arrival to LGA descend out of 3000 feet or our departure climb above 2000 feet there is a huge potential for loss of life. Even our Prop1 departure is a joke for single engine props keeping our departures on Runway 16 from turning into our arrivals because it doesn't address the twin props that turn just as sharp as single engine props. We should be a part of this Bravo airspace of LGA with redesigned airspace to better safely move traffic. I keep hearing nothing can be done... I keep hearing how we are behind on ELMS and that we can barely get a communication for safety class going; but really instead of these semi useless check a box stuff why can't we sit down and figure some important stuff out and not just give us new equipment that tries to get us to walk away from our position.

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.