FWIW: i have to say that they're working OK for me, too... i have the latest 2018.3.0 beta code from the repos... i start with the launcher with AW enabled and live METAR data... once the sim is running, i go to F10->Environment->Weather, switch the "Weather conditions" drop box from "Live data" to "CAT II minimum" and click on the [OK] button... i repeated the moves and this time selected "CAT IIIb minimum"... there is a very noticeable lack of visibility in CATIIIb than CATII...
here're my CATII and CATIIIb METAR strings...
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CATII: XXXX 012345Z 15010KT 0400 -RA BKN001 OVC002 08/06 Q0990
CATIIIb: XXXX 012345Z VRB01KT 0100 -RA FG OVC001 OVC002 02/02 Q0990
EDIT: Mihajlo posted while i was writing the above... i'm testing Mihajlo's scenario now... will be back with updates...
EDIT2: ok, yes... there is a problem if FG is started with the launcher and the launcher is set with AW off... when you get into FG and go to turn on AW, you get the following as well as the message on screen about the local weather being aborted... it is important that it says local weather... this does not happen if you try a second time to turn on AW in the sim...
here's the sequence from the command line...
1. start the launcher "FGFS --launcher"
2. check that Weather->Active Weather is turned off
3. click [Fly!] button
4. FG loads with basic weather and the following console output...
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[...]
Reading materials from /home/myuser/flightgear-dev/fgdata-ng/Materials/regions/materials.xml
Reading systems from Path "/home/myuser/flightgear-dev/fgdata-ng/Aircraft/Generic/generic-systems.xml"
Initializing HUD Instrument
Reading sound sound from Path "/home/myuser/flightgear-dev/fgdata-ng/Aircraft/ufo/ufo-sound.xml"
Creating subsystems took:3798
Splash screen progress binding-subsystems
Volcanic activity on.
Submodels: Unable to read AI submodel list
setWeight() - not supported for ufo
5. now, in-sim, F10->Environment->Weather-> enable AW->click [OK]
adds the following to the above...
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Request detected to initialize Advanced Weather on startup...
Loading local weather routines...
Starting hard-coded terrain presampling
Nasal runtime error: vector index 0 out of bounds (size: 0)
at /home/myuser/flightgear-dev/fgdata-ng/Nasal/local_weather/local_weather.nas, line 390
called from: /home/myuser/flightgear-dev/fgdata-ng/Nasal/local_weather/local_weather.nas, line 3868
called from: __dlg:weather, line 175
Reading materials from /home/myuser/flightgear-dev/fgdata-ng/Materials/regions/materials.xml
Reading systems from Path "/home/myuser/flightgear-dev/fgdata-ng/Aircraft/Generic/generic-systems.xml"
Initializing HUD Instrument
Reading sound sound from Path "/home/myuser/flightgear-dev/fgdata-ng/Aircraft/ufo/ufo-sound.xml"
Creating subsystems took:3798
Splash screen progress binding-subsystems
Volcanic activity on.
Submodels: Unable to read AI submodel list
setWeight() - not supported for ufo
AW is not active even though the dialog says it is... you have to run the dialog a second time and click [OK] and then AW starts as desired... this was also started from in the sim and NOT a "request to initialize AW on startup" like the message(s) say...
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."