Topic: False humidity spike?

[WxLover16]

Welp, looks like 99% is as high as it got this morning (still 98% now). Still a thick fog outside so no doubt atmosphere is completely saturated. Ah well. It's close enough.

[dendrite]

I'll just add that I've seen ASOS many times with a 1-2F dewpoint depression with M1/4SM FG obs. I wouldn't fret too much over it...98/99% is pretty good.

[belfryboy]

I'll just add that I've seen ASOS many times with a 1-2F dewpoint depression with M1/4SM FG obs. I wouldn't fret too much over it...98/99% is pretty good.

and still within the +/-2% quoted in the data sheet

[WxLover16]

I'll just add that I've seen ASOS many times with a 1-2F dewpoint depression with M1/4SM FG obs. I wouldn't fret too much over it...98/99% is pretty good.

True and I'm not. That is basically as good as it gets without actually hitting the 100 mark.

[CW2274]

I can tell you this much, DMA AFB (NWS/FAA) ASOS, hits 100% on a regular basis. Four miles away, TUS (NWS/FAA) ASOS, never hits 100%. You be the judge.

[dendrite]

I'm bouncing between 98% and 99% right now with my 2nd SHT31...temp is 67F. It's definitely soupy out, but there's no visible fog on cam.

[dalecoy]

I'll just add that I've seen ASOS many times with a 1-2F dewpoint depression with M1/4SM FG obs. I wouldn't fret too much over it...98/99% is pretty good.

and still within the +/-2% quoted in the data sheet

Out of curiosity - why don't folks whose humidity peaks at 99%, and never goes to 100%, use the console capability to add 1% to the sensor-measurement?

[CW2274]

Cheating. 

[WxLover16]

I'll just add that I've seen ASOS many times with a 1-2F dewpoint depression with M1/4SM FG obs. I wouldn't fret too much over it...98/99% is pretty good.

and still within the +/-2% quoted in the data sheet

Out of curiosity - why don't folks whose humidity peaks at 99%, and never goes to 100%, use the console capability to add 1% to the sensor-measurement?

I want it to do it on its own, gosh darnet! HA!

[dalecoy]

Out of curiosity - why don't folks whose humidity peaks at 99%, and never goes to 100%, use the console capability to add 1% to the sensor-measurement?

I want it to do it on its own, gosh darnet! HA!

It's doing that, within the +/-2% quoted in the data sheet. 

If you have long-term experience that says that it's actually just off by about 1% (at the maximum humidity), then applying 1% correction would seem to be making your measurements even more accurate.

Of course, you shouldn't do that casually - you should be convinced that the sensor is saying 99% when the humidity is actually 100%.  It appears (to me) that you have established a convincing case.