Beautiful Cloud Pictures Of A Cap On Around Cumulus

Over the weekend 2 people independently sent me pictures that amazed them...and they were looking for an explanation.

The kickoff was from Ellen Baker from Glacier, Washington taken piece of cake Fri afternoon.  There was a growing cumulus alongside what appears to move a lenticular ("lens shaped") cloud correct inwards a higher house it.


 And hither is i taken past times Catherine McConnachie around Marrowstone Island on Fri evening.  Influenza A virus subtype H5N1 chip different, simply the same idea...there appears to move a lenticular cloud correct inwards a higher house a growing cumulus.  And these clouds own got soft boundaries...they are made of ice.


What is going on?   How tin you lot larn a lenticular cloud without a mount barrier?

You can....and these are called Pileus cloud (which agency "cap" inwards Latin).

This is how it works.  Cumulus clouds, item growing cumulus congestus clouds equally seen above, are associated alongside strong upward motion.  This upward displace tin force the air inwards a higher house the cloud upwards.  Air existence pushed upwards cools because it expands equally it shoved toward lower pressure, since expansion is associated alongside cooling (like air coming out of wheel or car tire).   If that air aloft is relatively moist together with unopen to saturation, the cooling tin drive the air to saturate, producing clouds.

OK... let's meet if this makes sense.     Here is the upper air sounding on the WA coast for five PM Friday.  Temperature is inwards red, dew signal is inwards bluish together with the air is saturated alongside they are on overstep of each other.  The meridian coordinate is pressure, alongside 500 existence near 18,000 ft together with 700 near 10,000 ft.  The cumulus inwards the motion-picture demo were perchance 10,000 to 15,000 ft high.    The air was pretty much saturated to 550 hPa (about 17,000 ft) together with fairly unopen to saturation inwards some layers inwards a higher house (e.g., near 450 hPa).    Strong lifting from the growing cumulus could own got lifted together with saturated that upper layer--which equally mutual frigidity plenty to shape clouds made of ice.


Pileus clouds are to a greater extent than frequent that you lot powerfulness think, together with then proceed you lot eyes opened upward for them.  And forthwith you lot know a novel Latin word.



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