[frank.oconnor19]

yesterday I was taking a flight from TX back to NC. On my climb out I passed through a few cloud layers on way up to FL190. The plane was stable, about 110 IAS climbing at 700-800 FPM. Prior to entering clouds and picking up any moisture no issues. Outside air temp was slightly below freezing, maybe -2C. Once we entered the cloud and there was visible moisture on the windscreen I started to get a warning horn, Almost sounded like the stall warning, but no as consistent. Was kind of warbling. I applied Pitot heat, and turn the prop heat on, though these was at this time no visible ice on the leading edge of the wings. The horn remained, in the unstable warble until we were clear of the clouds for about 3-4 minutes. At this time we were climbing through 17,000 feet. My guess is I picked up a little ice on the stall tab and it was bouncing around. Would love to know if anyone has other ideas, and a way to remediate.

thanks

Frank