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Old 07-26-2021, 11:15 PM   #21
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Originally Posted by cadillackid View Post
there is still a dewpoint when its below freezing.. look up freezing fog.. its real and happens at temperatures below freezing wherew the humidity reaches 100% below freezing.

I've weather courses numerous times (military navigator, civilian pilot) and the only freezing fog or rain I'm familiar with is that which freezes to a below freezing object when it contacts that object (like the leading edge or a wing or prop.


Never saw fog at 30F or lower and I know at 0F there is no moisture in the air. At the negative 29 we played in the environment was drier than the sahara.


Just because I haven't seen it doesn't mean it can't exist but everything I've been taught tells me that very close to freezing it's possible to have transitioning moisture but 3 degrees would have to be pushing it. I could be wrong, but I'd need a scholarly journal, bonofide weather course or science manual.

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Old 07-27-2021, 12:22 PM   #22
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Quote:
Originally Posted by HamSkoolie View Post
I've weather courses numerous times (military navigator, civilian pilot) and the only freezing fog or rain I'm familiar with is that which freezes to a below freezing object when it contacts that object (like the leading edge or a wing or prop.


Never saw fog at 30F or lower and I know at 0F there is no moisture in the air. At the negative 29 we played in the environment was drier than the sahara.


Just because I haven't seen it doesn't mean it can't exist but everything I've been taught tells me that very close to freezing it's possible to have transitioning moisture but 3 degrees would have to be pushing it. I could be wrong, but I'd need a scholarly journal, bonofide weather course or science manual.



Who knew? THe cadillackid of course.


I didn't have time to find a "scholarly journal, bonofide weather course or science manual." but I was curious so a quick search

https://duckduckgo.com/?t=ffsb&q=loo...ing+fog&ia=web
found this
https://wgntv.com/weather/weather-bl...-freezing-fog/


although I still wonder just how much moisture the air can hold at 29 degrees F or lower. Now where did I put that water psychometric chart? Found it, but only goes down to to 0 degrees C aka 32 degrees F. now what? gotta find another chart? later, no time now
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Old 07-28-2021, 02:57 AM   #23
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Interesting but yeah, how little water is in the air at that temp?


I've been in sub zero (in a tent in the woods) for two weeks and never saw fog. I don't even remember seeing fog from our breath except inside the tent where it was 27F. It got down to -29 on that trip with a wind chill of -60 at one point.
And to think I volunteered for that thinking it would be better than the desert. NEVER AGAIN
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