Page 209 - PPL-2025-9fag
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Meteorologi
3.4.8.2 Vindbyger og vindstød ......................................................................... 264
3.4.8.3 Veer og bakke ....................................................................................... 264
3.4.8.4 Vindpose .............................................................................................. 265
3.5 Fugtighed og nedbør .................................................................................. 266
3.5.1 Vands tre tilstandsformer ....................................................................... 266
3.5.2 Luftens fugtindhold ................................................................................. 267
3.5.3 Damptryk og mætningstryk ..................................................................... 268
3.5.3.1 Absolut fugtighed ................................................................................. 269
3.5.3.2 Relativ fugtighed .................................................................................. 269
3.5.3.3 Fugttighedsangivelse ved flyvning ....................................................... 270
3.5.4 Stabil og instabil luft ................................................................................ 271
3.5.4.1 Stabil, instabil og betinget instabil luftmasse ...................................... 271
3.5.5 Adiabatiske processer ............................................................................. 273
3.5.5.1 Tøradiabatisk proces ............................................................................ 273
3.5.5.2 Fugtadiabatisk proces .......................................................................... 273
3.6 Skyer ........................................................................................................... 276
3.6.1 Dannelsen af skyer .................................................................................. 276
3.6.1.1 Kondensationsniveau ........................................................................... 276
3.6.2 Skyer - typer............................................................................................. 278
3.6.2.1 Strato – lavtliggende skyer ................................................................... 278
3.6.2.2 Alto – mellemliggende skyer ................................................................ 279
3.6.2.3 Cirro – højtliggende skyer .................................................................... 279
3.6.2.4 Nimbus - nedbørsskyer ........................................................................ 280
3.6.3 Dannelsen af skyer .................................................................................. 281
3.6.3.1 Konvektionsskyer ................................................................................. 282
3.6.3.2 Frontskyer / advektionsskyer ............................................................... 282
3.6.3.3 Orografiske skyer ................................................................................. 282
3.6.4 CB-skyen .................................................................................................. 283
3.6.4.1 CB-skyens vækstbetingelser ................................................................. 284
3.6.4.2 CB-skyens udvikling .............................................................................. 285
3.6.5 Vindgradient og vindbyger på start og landing ....................................... 286
3.6.5.1 Angivelse af skymængde ...................................................................... 287
3.6.6 Tåge ......................................................................................................... 287
Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 209
