Forum Replies Created
-
Posts
-
Fronts either coming in or retreating sometimes provide for the multi-layers of wind not all going in the same direction..which produces great displays as the orientation of wind direction changes over the day. You captured a pretty neat day Hans!
Another shot showing the physics that produce Asperitas, existing over two sets of cloud.
Arizona Asperitas #129
Thanks Keelin, They don’t last for very long so keep an eye for them when the congestus build up on a not too windy day. Later in the afternoon is when the physics get strong enough to force these little delights out of hiding.
Yes Hans, a tropical storm came up the Baja and kinda sat there on the California/ Arizona border feeding what seemed like days of storm. Lots of rain. Some small parts of the Valley flooded. Temperatures dropped from lows in low 80 f to mid 50 f.Ground is still wet as of this a.m.
I found The South West Regional Weather Statistics Report , centered out of San Diego Ca. and it shows:
Average temperature for August Phoenix Arizona 1950 – 2000: Disgusting!
Highest temperature During August Phoenix Arizona 1950-2000: When Everybody Left Town And Went To Flagstaff
Average Humidity During August Phoenix Arizona 1950-2000: Fetid Panting Dog Breath
One of the challenges is dealing with several Pileus occurring at the same time. Sometimes you get lucky when photographing one, another pops into view nearby. An interesting velum shot turned into a photo bomb opportunity for Pileus.
Arizona Cloudscape#85
ps..Im gettin some excessive red saturation on pics at this website. Anybody else noticing a difference between a pic as seen on your computer and as seen on the CAS website?
Hans, Thanks for contributing!. My comment on humidity is deceptive. Relative humidity might be more accurate. At 110f any humidity over, even 10% is uncomfortable, but the point is,,the atmosphere contains much moisture as it is pumped up from the subtropics by a High Pressure centered around 4corners area of the Southwest. I don’t have the formula in front of me but when the atmosphere is very warm it can contain a lot of moisture and it does. What percentage an atmosphere can be of moisture, before it reaches maximum, when it condenses out of the atmosphere, its dew point, depends on temperature and pressure. Both play significant roles in manifesting Pileus. The temperature of the atmosphere puts parameters on the existing dew point ,and the fast rising column of cloud (heat being its engine) compresses the atmosphere above it, increases pressure to eventually bring the above atmosphere to a dew point forcing condensation to happen, a human below witnesses a faint smudge that appears out of nowhere and says Look! Magic! and is entertained by the evolving fashion show of fine linen flowing down and through the columns of cloud. Versace can’t touch this stuff. btw, a side note,,its my observation that in order to more successfully spot Pileus, look for the fast rising columns amongst the congestus. You may notice at a certain height Pileus is manifested. Pileus doesn’t always happen at the very tops of cloud cells. Anyway, 35% moisture at 110F is rather disgusting .And thats just for starters. If you do not want to sweat,you stay in an air conditioned environment period. Even thats a misstatement. We are always sweating. Its just the air absorbs the moisture we exude, but stops when the air already has plenty of moisture. Then it stops absorbing our moisture and it stays on our bodies turning us into clams and jelly fish…a Nobel Peace Prize to the first geneticist who figures out how to make our sweat smell like roses!
Looks like you had a great time in France, Hans. I think if you look closely you’ll see undulations within undulations in a lot of Asperitas shots.
Heres an easy going Asperitas shot.
Arizona Asperitas# 128
