This pic is from frequent flyer CATIII Approach while flying back to work into Fort McMurray, Alberta. The distinct line is low cloud affected by local terrain. It's due to subsidence which is sinking air causing clouds to dissipate. Subsidence is also prevalent with high pressure system which brings clearing skies.
Instead of heading south to Cozumel, Mexico I was asked to fly to Edmonton, Alberta last evening and fly the return "red eye" home. One passenger did not show up so procedure is to sequence their bags. We push back 20 minutes late. While waiting, I had a frequent flyer (Super Elite) ask if I would sign my article in the enRoute magazine. He said after 200 segments he finally met up with me. Great guy, and even better, he bought my book!
I make an announcement filling everyone in. "Our flight plan said we were 5 minutes under sked and our weather charts claimed a smooth flight." All the time there is an inner voice saying..."you are tempting the weather gods ...don't go out on a limb!" And sure enough! Sometimes that P.A pulls stuff out of me and I wonder where it came from? Just like some emails I send. :)
Weather precursors were indicating Toronto would be next on the meteorological list as an easterly wind, falling barometer and "grease around the moon" (cirrostratus cloud) said rain is nearby. Sure enough saturated runways and strong winds from the southeast greeted us at 6:00 a.m on the return leg.
Strong southerly jet streams over the Great Lakes turned Captain D into a meteorological fibber as we encountered light to moderate turbulence. Luckily the remainder of the flight mother nature's moodiness subsided. (Subsidence is everywhere) :)
The F/O flew a text book ILS onto runway 30 last night but we picked up a little ice on the wings on the approach and with minus 5 C surface temperatures it wasn't going away in a hurry.
Thought we were going to push back early, but a reset of the data link put a kibosh to that idea. I thought I escaped the "deice" checklist for the season but...NO...out it comes again.
More bumps greeted us over Green Bay (Lake Michigan area) at 3:00 a.m.
But luckily wet runways make for smooth runways and that held true for captain D during the wee hours this morning.
Off to Mexico tomorrow where the field elevation is the highest I fly to...7300 feet.
Can you say density altitude? One good thing, it must bestow easy membership for the "mile high club." LOL