Narrative:

As we approached runway 8 in den for takeoff; tower cleared a flight ahead of us for takeoff and told them that they had a windshear alert over the runway. That flight continued takeoff. I told my first officer that if they try to clear us for takeoff; that we can't go with a windshear alert on airport. Sure enough; they cleared us for takeoff and we told them we can't go with a windshear alert on airport. They cancelled our takeoff clearance and told us to clear off to the holding area. They then asked a flight behind us if they could takeoff; and that flight told them to standby. I then started to ask for more information about the windshear alert. Tower said he had the alert since he had been there. I asked if the system was malfunctioning and if they had someone looking into the system. Tower wasn't sure and then said that the alert had been there most of the day.tower asked the aircraft that just took off if they experienced any windshear; they said no. The aircraft behind us then said that they could takeoff. I told my first officer that we would see what that flight sees before we make our decision. In the meantime; I turned on the weather radar and pointed our nose toward the departure end of the runway to check things out; no issues. I told my first officer we would also do the 'adverse takeoff' profile just to be safe. After the second aircraft was cleared for takeoff; tower asked them if they encountered windshear; they said no. Given everything we had heard/seen; we told tower we were good now and tower cleared us for takeoff and issued winds but did not issue us a windshear alert. During takeoff; we did experience a momentary increase of about 15-20 knots passing about 200 feet AGL. Passed that information on to tower and continued flight.ATC needs to take windshear alerts a little more seriously. Even in VMC; being at the base of the rockies; windshear is always a concern. If tower is getting a consistent alert that does not seem to make sense; then they need to look into their systems.

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Original NASA ASRS Text

Title: During taxi to takeoff; a B737-700 flight crew reports being informed by the Tower of a windshear alert. The next aircraft is cleared to takeoff and does so without issue. The reporters elect to delay their takeoff and query the Tower for more information. The Tower indicates the system has been alarming all day and the crew elects to depart and encounters a 20 knot increasing headwind at 200 feet AGL.

Narrative: As we approached Runway 8 in DEN for takeoff; Tower cleared a flight ahead of us for takeoff and told them that they had a windshear alert over the runway. That flight continued takeoff. I told my FO that if they try to clear us for takeoff; that we can't go with a windshear alert on airport. Sure enough; they cleared us for takeoff and we told them we can't go with a windshear alert on airport. They cancelled our takeoff clearance and told us to clear off to the holding area. They then asked a flight behind us if they could takeoff; and that flight told them to standby. I then started to ask for more information about the windshear alert. Tower said he had the alert since he had been there. I asked if the system was malfunctioning and if they had someone looking into the system. Tower wasn't sure and then said that the alert had been there most of the day.Tower asked the aircraft that just took off if they experienced any windshear; they said no. The aircraft behind us then said that they could takeoff. I told my FO that we would see what that flight sees before we make our decision. In the meantime; I turned on the weather radar and pointed our nose toward the departure end of the runway to check things out; no issues. I told my FO we would also do the 'adverse takeoff' profile just to be safe. After the second aircraft was cleared for takeoff; Tower asked them if they encountered windshear; they said no. Given everything we had heard/seen; we told Tower we were good now and Tower cleared us for takeoff and issued winds but did not issue us a windshear alert. During takeoff; we did experience a momentary increase of about 15-20 knots passing about 200 feet AGL. Passed that information on to Tower and continued flight.ATC needs to take windshear alerts a little more seriously. Even in VMC; being at the base of the Rockies; windshear is always a concern. If Tower is getting a consistent alert that does not seem to make sense; then they need to look into their systems.

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.