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35 members (James, janiemae, russellb, CouchNapper, Chad Burnette, Mulcher, desertdog, mcninja, Ron A., MIB, dave260rem!, NoHuntin, ImThere, RareBreed, sanderson, Oscarflytyer, cmontgomery, robinhedd, Longtine, odocoileus, RSF, Uokman2014, Cactus_buck, remlap, sevenup, MountainTopHunter, Dixiepatriot, BRP549, jawbone, jake5050, kodiak06, 4 invisible),
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Joined: Sep 2012
Posts: 24,103 Likes: 296
Freak of Nature
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Freak of Nature
Joined: Sep 2012
Posts: 24,103 Likes: 296 |
Temp drop = thermals lowered
Temp rise = thermals raised
What, and how do, other variables affect thermal movement, i.e. hills, swamp, lowland, wind? Anybody have edumacated knowledge on this? Other than the basics you stated, be mindful of steep inclines either from rocks or cedars. This can cause the air to swirl back on itself. Like an Eddie in a river. A light wind and thermals will work together. But heavy wind will push the thermal the direction of the wind. Don't get lazy and think that mornings = rising thermals. Really cold mornings with no wind will continue to sink. Humidity also makes air heavier. Use this cause bucks may be traveling on the bottom. I think the best thing to do is to keep a journal. Monitor temp and forcasted wind. Then write down actual scent direction at that stand and try to figure out why so you can learn more about all your other stands. Still learning myself, but I'm getting to where I like hunting mountains better than flat cause of thermals and hunting benches. Increased humidity DECREASES air density, i.e. makes it lighter. Use a psychrometric table or air properties calculator. For example, where I hunt, elevation is 300' above sea level. For 32 F and 40% RH, air density is 0.07974 lb/cu ft. If RH increases to 80%, density is 0.07966 lb/cu ft. Molecular weight of water is roughly 18 g/mol regardless of liquid or gas phase. Air without water is roughly 29 g/mol. More humidity = more water = reduced density for the overall mixture. Yes, it only feels heavier to us, but humid air is lighter. Long distance shooters know this.
Dying ain't much of a living boy...Josey Wales
Molon Labe
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Joined: Feb 2014
Posts: 2,785
10 point
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10 point
Joined: Feb 2014
Posts: 2,785 |
Temp drop = thermals lowered
Temp rise = thermals raised
What, and how do, other variables affect thermal movement, i.e. hills, swamp, lowland, wind? Anybody have edumacated knowledge on this? Other than the basics you stated, be mindful of steep inclines either from rocks or cedars. This can cause the air to swirl back on itself. Like an Eddie in a river. A light wind and thermals will work together. But heavy wind will push the thermal the direction of the wind. Don't get lazy and think that mornings = rising thermals. Really cold mornings with no wind will continue to sink. Humidity also makes air heavier. Use this cause bucks may be traveling on the bottom. I think the best thing to do is to keep a journal. Monitor temp and forcasted wind. Then write down actual scent direction at that stand and try to figure out why so you can learn more about all your other stands. Still learning myself, but I'm getting to where I like hunting mountains better than flat cause of thermals and hunting benches. Increased humidity DECREASES air density, i.e. makes it lighter. Use a psychrometric table or air properties calculator. For example, where I hunt, elevation is 300' above sea level. For 32 F and 40% RH, air density is 0.07974 lb/cu ft. If RH increases to 80%, density is 0.07966 lb/cu ft. Molecular weight of water is roughly 18 g/mol regardless of liquid or gas phase. Air without water is roughly 29 g/mol. More humidity = more water = reduced density for the overall mixture. Yes, it only feels heavier to us, but humid air is lighter. Long distance shooters know this. Good to know. Thanks guys.
I believe that this is a practical world and that I can count only on what I earn. Therefore I believe in work, hard work. -George Petrie (1945)
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Joined: Dec 2017
Posts: 271
4 point
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4 point
Joined: Dec 2017
Posts: 271 |
Just learned something new. So how does a change in humidity affect scent travel? Thermals rise or lower at a different rate?
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Joined: Jul 2011
Posts: 39,938 Likes: 130
Freak of Nature
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Freak of Nature
Joined: Jul 2011
Posts: 39,938 Likes: 130 |
Scent just hangs in humid air . Deer gets close at all he'll smell ya. Thermals work best on clear , cold sunny days on a south facing slope . They take the scent up.
"Why do you ask"?
Too many people spend money they don't have , on things they don't need, to impress people they don't know.
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