My first octave A is flat.
Other notes seem normal…?
R
Hmmm…
Sounds like a flat A to me.
there’s a word for them kinda replies around these parts…
something that rhymes with ChartGlass.
I post the A, only because I’ve never had a flat A…
Flat A … Are you complaining or boasting? 
I should add that the back D is gurgling a bit with slightly higher than normal air volume..
hmm
…okay…this is impossible to do here for about 1000 reasons, but maybe a trim of a 1/64th off that reed, and perhaps a wee scrape after where the pitch is. that is, IF the back d is in gurggles-ville too close to operating pressure.
Or just wait for the weather to change again…
What the…??? Was it in tune before and only now is flat?
If so check for dust or dirt in the reed itself. Also check for anything that may have gotten lodged in the chanter bore or tone hole.
You should make sure that the reed is firmly seated in the chanter. My back d’s usually act up if it’s in any way loose.
Hope that helps,
Paul
If after making, and fitting, several reeds the A is still flat, that usually requires altering the A tone hole, usually by undercutting, if the note is slightly flat; and filling and actually moving the hole if the note is very flat.
All of this should be done by a good pipe maker.
Have fun,
Pat Sky
Maybe you just need to squish your bridle a little bit.
Yep
the weather might change and the reed will too
if its gonna stay this way for the season, I guess opening the lips slightly might improve things…BUT…
a lot of players will simply adapt technique a bit as a temporary measure while waiting for the reed to change back
ie vent the A by opening the F finger/F hole at same time as the A hole, it might even need more than that
as for the back D, try venting with the top finger (C#)
that or easing off the pressure
or play long back D’s off the knee with the C# hole open as well as the back D hole
A friend of mine (Trevor Stewart) used to tell me that if the reeds were out of sorts, he tended to put the pipes away after a couple of tunes and wait to see if the weather was the reason. A day or two later they were often back to normal again.
I have noticed that my pipes “huff” with me. If I havent played them in a while, they always misbehave 
Boyd