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2020 LTS airport announcement and Iceland intro draft: Difference between revisions
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2020 LTS airport announcement and Iceland intro draft (view source)
Revision as of 08:34, 5 November 2020
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FlightGear's Advanced Weather (AW) engine simulates terrain-driven, continually evolving, weather on multiple scales - you can watch the lifecycle of a single cumulus cloud from the first wisps to eventual decay depending on the conditions it encounters. Look under Environment > Detailed Weather > Advanced Weather settings for controls. To activate the weather simulation, choose weather scenarios in the list from "Core high pressure region", through to "Warm Sector" - these describe the air masses around your starting point. "Fair Weather" is also fine, as it's just "Core high pressure region". Other types of scenarios will do things like tie weather to best guesses at vague METARs, and apply the same weather everywhere all the time. Using live METARs will additionally tie FG to weather conditions for the current time of day and season for that location - regardless of the time, date, and season you simulate. | FlightGear's Advanced Weather (AW) engine simulates terrain-driven, continually evolving, weather on multiple scales - you can watch the lifecycle of a single cumulus cloud from the first wisps to eventual decay depending on the conditions it encounters. Look under Environment > Detailed Weather > Advanced Weather settings for controls. To activate the weather simulation, choose weather scenarios in the list from "Core high pressure region", through to "Warm Sector" - these describe the air masses around your starting point. "Fair Weather" is also fine, as it's just "Core high pressure region". Other types of scenarios will do things like tie weather to best guesses at vague METARs, and apply the same weather everywhere all the time. Using live METARs will additionally tie FG to weather conditions for the current time of day and season for that location - regardless of the time, date, and season you simulate. | ||
To recreate the turbulent windfields associated with the rugged mountainous terrain make sure terrain effects, terrain presampling, and thermal generation are enabled. The controls for detailed gust controls, cloud shadows, realistic visibility, ground haze and structure are also there. For shorter trips you may want to decrease the sizes of distinct air masses and scales of weather patterns, to see more change, more often. There are far more weather variables under the hood than are (and can be) exposed in the GUI. These weather variables are randomised each time the AW simulation is restarted - press 'Apply' to restart. What you see around your starting point, for each scenario very roughly describing airmasses around you like "Border of a high pressure region", is just one of a huge number of weather possibilities that can exist with those airmasses - for that terrain, at that latitude, and at that time. Remember that to recreate Iceland's cool temperatures, the temperature offset needs be lowered to adjust the weather scenarios used AW simulation - put in a negative value to lower temperatures like "-25". As temperatures decrease, rain will turn to snow or hail as appropriate. With lower temperatures you'll be rewarded more often with stunning halos around the sun and other types of scattering by ice crystals in clouds. | To recreate the turbulent windfields associated with the rugged mountainous terrain make sure terrain effects, terrain presampling, and thermal generation are enabled. The controls for detailed gust controls, cloud shadows, realistic visibility, ground haze and structure are also there. For shorter trips you may want to decrease the sizes of distinct air masses and scales of weather patterns, to see more change, more often. There are far more weather variables under the hood than are (and can be) exposed in the GUI. These weather variables are randomised each time the AW simulation is restarted - press 'Apply' to restart. What you see around your starting point, for each scenario very roughly describing airmasses around you like "Border of a high pressure region", is just one of a huge number of weather possibilities that can exist with those airmasses - for that terrain, at that latitude, and at that time. Remember that to recreate Iceland's cool temperatures, the temperature offset needs be lowered to adjust the weather scenarios used AW simulation - put in a negative value to lower temperatures like "-25". As temperatures decrease, rain will turn to snow or hail as appropriate. With lower temperatures you'll be rewarded more often with stunning ice halos around the sun and other types of scattering by ice crystals in clouds. | ||
Aurora Borealis, and sun halo. The halo is caused by light bouncing off ice crystals in the atmosphere. The halo is red as the sunlight from the low sun is red. Try setting 'time warp' to 4x or more in Environment > Time to see the Aurora dance a bit more clearly. | Aurora Borealis, and sun halo. The halo is caused by light bouncing off ice crystals in the atmosphere. The halo is red as the sunlight from the low sun is red. Try setting 'time warp' to 4x or more in Environment > Time to see the Aurora dance a bit more clearly. | ||
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[ [[:File:Aurora_and_ice_halo_(Flightgear_2020.x).jpg|Screenshot of Aurora in Iceland]] ] | [ [[:File:Aurora_and_ice_halo_(Flightgear_2020.x).jpg|Screenshot of Aurora in Iceland]] ] | ||
Sun dogs on both sides of the sun caused by ice crystals , and a faint ice halo ( | Sun dogs on both sides of the sun caused by ice crystals, and a faint ice halo. The vertical spike of light at the center of the sun is a light pillar (sun pillar) also caused by ice crystals. | ||
[ [[:File:Sun_dog_and_ice_halo_in_Vatnajokull_National_Park,_Iceland_(Flightgear_2020.x).jpg|Screen shot of sundogs and faint halo]] ] | [ [[:File:Sun_dog_and_ice_halo_in_Vatnajokull_National_Park,_Iceland_(Flightgear_2020.x).jpg|Screen shot of sundogs and faint halo]] ] | ||