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3.6.2 Tåge, tågedis og tør-dis ............................................................... 181
3.6.3 Advektions- og fronttåge ............................................................ 183
3.6.4 Sigtbarhed ved tågedis, sne, røg, støv og sandfygning ................ 184
3.7 Luftmasser ........................................................................ 187
3.7.1 Ændring af en luftmasse ............................................................. 188
3.8 Fronter ............................................................................. 193
3.8.1 Vandrende lavtryk ....................................................................... 195
3.8.2 Frontskyer ................................................................................... 196
Varmfronten ........................................................................................... 198
Koldfronten ............................................................................................ 199
Okklusion ............................................................................................... 199
3.9 Farligt flyvevejr ................................................................. 200
3.9.1 Vejrfænomener og SIGMETS ........................................................ 202
3.9.2 Isdannelse ................................................................................... 204
Symboler på vejrkort .............................................................................. 208
3.9.3 Torden ......................................................................................... 208
3.9.4 Flyvning i bjergområder ............................................................... 214
3.10 . Klimatologi ....................................................................... 215
3.11 . Meteorologisk information .............................................. 217
3.11.1 Vejrinformation til forberedelse af flyvning ............................... 218
3.11.2 Forkortelser – vejrfænomener .................................................... 221
3.11.3 Forkortelser og symboler på Significant Weather Chart .............. 222
3.11.4 General Aviation Forecast .......................................................... 224
3.11.5 Observationer – aktuelt vejr ....................................................... 225
3.11.6 Koder METAR, TREND, TAF ......................................................... 226
Metar .................................................................................................... 227
Trend .................................................................................................... 230
TAF ........................................................................................................ 231
VMC ...................................................................................................... 232
Vejroplysninger under flyvningen .......................................................... 233
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