We are working on this issue in SU2 beta which is available at the downloads page (http://hifisimtech.com/downloads), or see the pinned posts regarding this. Most users report that this issue is resolved in the open beta build.
Fix Attempted - Please Confirm in New Build Wind shifts in latest builds
- Thread starter airbadger
- Start date
We have this one (maybe two, unconfirmed) reports of continued shift issues with 9126. The vast amount of issues reported were confirmed related to trying to depict > 149kt winds. Now we're trying to go back to >149 knots at users request, but it may not be possible (as this apparently nearly always causes wind to stop depicting temporarily causing massive shifts).
As to speed not changing and wind direction changing, this appears something else/new entirely. If you're climbing through layers, this is MSFS depiction as stated above, the shear experienced is from MSFS layer depiction and not something we have control over at the moment. This is in regards to stable altitude cruise winds. In any case, since this is apparently much different that the previous issue, can you please post details in a new thread and title in something like "Wind direction shift changes new to B9126"? Thanks.
As to speed not changing and wind direction changing, this appears something else/new entirely. If you're climbing through layers, this is MSFS depiction as stated above, the shear experienced is from MSFS layer depiction and not something we have control over at the moment. This is in regards to stable altitude cruise winds. In any case, since this is apparently much different that the previous issue, can you please post details in a new thread and title in something like "Wind direction shift changes new to B9126"? Thanks.
LiquidDinosaur
New member
Same behavior with 9126 today.
Winds are at 356 @ 54 then rotate through all headings clockwise to 333 @ 66 in the climb.
Video clip jumps to a few minutes later where winds are 344 @ 81 then flip around settling at 97 @ 82, level at 35000.
Winds are at 356 @ 54 then rotate through all headings clockwise to 333 @ 66 in the climb.
Video clip jumps to a few minutes later where winds are 344 @ 81 then flip around settling at 97 @ 82, level at 35000.
The fixes worked on are regarding level cruise only. Wind shifts in climb out or descent are known due to MSFS wind layer depiction and not currently something we can control and this can be reproduced in sim by setting "shearing" wind layers similarly or using live weather. We’ve not yet been able to replace all winds in MSFS due to the weather api restrictions. We are working on some new things but this is not yet in scope for current ASFS features.
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Don't know if folks have tested much with sim rate at 2x, but I'm getting wild wind direction and velocity swings while at steady cruise at times that seem inexplicable, in pretty much clear weather conditions. Wind direction changes of over 60 degrees back and forth, and velocity changes of about 70kts, all at the same time. Which feels very similar to the issues other folks have reported here. Wind speeds are nowhere near 149.9, and this issue isn't new for me with B9126. I switched back to MSFS Live Weather for a while and things were a lot more stable during time acceleration.
LiquidDinosaur
New member
I am unable to reproduce this behavior with live weather, in fact I now need to switch to live weather in order to avoid this. Also, the issue does not occur only during climb. The same thing happens when flying level. The second part of the second video I posted shows that.
After more investigation and testing, we're finding that it's likely a recent MSFS update has introduced a new issue here affecting preset weather. We're able to reproduce easily without ASFS using preset customized weather, but this does not seem to affect live weather. In the past we noticed some anomalies in some conditions/wind parameters that caused shifting but also affected live weather.
We're working on it.
We're working on it.
LiquidDinosaur
New member
Thanks for the update! If there is any more data you need that would help, please let us know.
If anyone has a good test case here with recent weather, please post your location and date/time UTC to help with repros. Please also specify if this was at stable cruise altitude or during climb/descent with altitude details.
I'm on hour ~35 of testing actual sim flights specifically on this, with 2020 vanilla, FL330-410, ASFS SU2 beta and //42 SimFX, basically around the world, with live weather (active), and have not had any shifts. I have been able to duplicate the issue with manual wind layer setting without any add-ons as mentioned, but nothing in actual sim use. Reproduction scenarios are very much appreciated.
Thank you!
I'm on hour ~35 of testing actual sim flights specifically on this, with 2020 vanilla, FL330-410, ASFS SU2 beta and //42 SimFX, basically around the world, with live weather (active), and have not had any shifts. I have been able to duplicate the issue with manual wind layer setting without any add-ons as mentioned, but nothing in actual sim use. Reproduction scenarios are very much appreciated.
Thank you!
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Hi Damian,
thank you for the continued effort to fix this!
Do you have any indication at this time as to whether you will be able to overcome the 149.9 knot limit?
I fly regularly in ~200 knot jet streams, l across the mid-Pacific and so far I have not suffered any windhsifts using B9115.
P.S. I only use MSFS 2020 and as far as I know there has not been an update to it since October 1, 2024. What could have changed to introduce this new maximum wind speed limit and potential wind shift bug?
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In latest builds, using preset weather control, we have not been able to exceed 150 knots. It results in zero winds any time the speed is over 149.90000 in our tests. We are working on it, it is still early, but at this time with current build it looks like wind speed is being limited in MSFS directly to 150 most of the time, and occasionally 149.9 (and possibly a lower threshold for inconsistent wind zeroing). Are you able to achieve higher wind speeds via any means?
I just tested B9115 with Active Preset Control (Historic Weather) and the latest MSFS 2020 build and indeed the moment I climb through the FL where the wind speed exceeds 149.9 knots, the depicted wind speed suddenly falls to ~10 knots and remains there. i.e., the sim is not depicting speeds greater than 149 knots
I am certain that I previously saw wind speeds in excess of 149 knots being depicted accurately in MSFS 2020 using ASFS.
What would cause this to suddenly no longer work?
@damian Any chance you can post a older ASFS build?
I would like to test if that makes any difference. Unless you know for a fact it won’t.
Very frustrating to say the least. If Asobo broke this then this really a a major issue. Limiting winds to a arbitrary 150 knots is absurd. The Atlantic/Pacific jet streams are regularly moving at 200+ knots.
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Hello, I've also been experiencing some pretty severe wind shifts. Here is the log for the last flight I did. It happened maybe 3 or 4 times in steady cruise and then I once in descent. Times I made note of were 16.27 and 16.28 but think it happened twice before and then once after in descent
LiquidDinosaur
New member
Here is my reproducible scenario. Hopefully this will be of help.
KPDX to KSAN : KPDX/10L CASCD3 PUHTS DCT PITVE Q11 PASKE DCT HUULK COMIX2 KSAN/27
Date & Time :
ASFS Historical Weather : 07 Jan 2025 @ 18:37Z
Takeoff Roll : 07 Jan 2025 @ 18:56Z - (Video timestamp 18:40)
Video shows ASFS Debug window and MSFS Developer Debug Weather window. (Note: Recording only goes until PITVE)
Noted wind direction changes
Gradual to quick directions changes switching between 125, 009 and 320
22:10 - 23:41 : 130 CCW 009
23:41 - 25:52 : 009 CW 320
25:52 - 28:44 : 320 CCW 009
28:44 - 29:19 : 009 CW 117
29:19 - 29:34 : 117 CCW 008
Then steady around 008 for a while.
29:34 - 32:42 : Steady
Then a sudden 340 degree change (long way) from 008 to 348
32:42 - 33:29 : 008 CW 348
Steady winds for a while.
33:29 - 37:50 : Steady
37:50 - 37:50 : ToC
37:50 - 42:23 : Steady
Sudden 123 degree change from 358 to 121
42:23 - 43:01 : 358 CW 121
Steady winds for a while.
43:01 - 43:33 : Steady
Sudden change from 111 to 082 then back to 112
43:33 - 43:51 : 111 CCW 82 CW 112
Steady winds for a while
43:51 - 50:23 : Steady
Sudden 109 degree change from 114 to 005
50:23 - 50:36 : 114 CCW 005
Steady winds for a while
50:36 - 53:03 : Steady
Sudden change from 005 to 030 then back to 005
53:03 - 53:18 : 005 CW 030 CCW 005
KPDX to KSAN : KPDX/10L CASCD3 PUHTS DCT PITVE Q11 PASKE DCT HUULK COMIX2 KSAN/27
Date & Time :
ASFS Historical Weather : 07 Jan 2025 @ 18:37Z
Takeoff Roll : 07 Jan 2025 @ 18:56Z - (Video timestamp 18:40)
Video shows ASFS Debug window and MSFS Developer Debug Weather window. (Note: Recording only goes until PITVE)
Noted wind direction changes
Gradual to quick directions changes switching between 125, 009 and 320
22:10 - 23:41 : 130 CCW 009
23:41 - 25:52 : 009 CW 320
25:52 - 28:44 : 320 CCW 009
28:44 - 29:19 : 009 CW 117
29:19 - 29:34 : 117 CCW 008
Then steady around 008 for a while.
29:34 - 32:42 : Steady
Then a sudden 340 degree change (long way) from 008 to 348
32:42 - 33:29 : 008 CW 348
Steady winds for a while.
33:29 - 37:50 : Steady
37:50 - 37:50 : ToC
37:50 - 42:23 : Steady
Sudden 123 degree change from 358 to 121
42:23 - 43:01 : 358 CW 121
Steady winds for a while.
43:01 - 43:33 : Steady
Sudden change from 111 to 082 then back to 112
43:33 - 43:51 : 111 CCW 82 CW 112
Steady winds for a while
43:51 - 50:23 : Steady
Sudden 109 degree change from 114 to 005
50:23 - 50:36 : 114 CCW 005
Steady winds for a while
50:36 - 53:03 : Steady
Sudden change from 005 to 030 then back to 005
53:03 - 53:18 : 005 CW 030 CCW 005
I don't use preset weather, only live weather. I'm having a few days off and we're flying through Europe back and forward. Winds are massively shifting up to 180 degrees during climb and descend. Stalled a few times, overspeed more than 80kts. Wind speeds today around 10-20kts so not a big deal, but yesterday around 100kts (Jetstream?) causing major problems. Wind is shifting on every flight. I played a bit with the settings, but that didn't help.
Running build 9126, but a friend of mine is running build 9115 experiencing the same issue.
Update
First, our findings from more testing and examination over the past few days:
We've found that there is an override of the wind speed maximum value capped at 150.0000649kts (77.1667mps) internally in the MSFS UI code, which not only clamps/limits max wind speed, but causes a zeroing of wind speed as winds approach this (~149 knots, depending on some units conversion and variable resolution) due to an apparent bug. It not only limits the UI-settable speed, but also the internal weather listener preset data update logic to apparently ensure that UI-based add-ons cannot set a higher wind speeds. We are not sure when this limit was added, but we suspect it was done approximately late October or early November based on reports that we received during that time frame. We're not sure the reason this was done or exactly when it was done. It could just be an oversight/bug. It could have been for a long time and we just now noticed. We recommend that users request a higher settable wind speed in the weather layer UI configuration that will also allow add-ons such as ASFS to set higher speeds. Perhaps with enough demand/interest they will consider "fixing" this.
The wind speed zeroing is likely the main culprit of reported wind shifts over the past few months, when flying in areas/altitudes where wind speeds exceeded this per the real conditions data. This has been "resolved" by ASFS B9144, just posted, by adding a new wind speed limiter option (sim depiction options) which default to 148. We've also added source data modification to match this maximum setting so that flight planning/briefing using ASFS is all consistent based on this. You're free to set a higher speed, but if higher than 149 knots is experienced, you will get zero winds, based on all our testing, so we don't recommend increasing this speed unless a new MSFS build releases with a fix here.
The second cause of wind shifts found was due to a long-standing bug in MSFS wind code that we have observed for many years, related to some kind of normalization or vectorization issue where winds that go back and forth through clockwise or anti-clockwise rotations during climb or descent can cause "wrong way" interpolation/smoothing as well as hard reset of direction unexpectedly. We've resolved this in the past with our direct wind control, but until now, this was not something we've been able to achieve in MSFS. However, with B9144 just posted, we have introduced experimental DWC which should, in theory, control all aloft winds and prevent further wind shifts. We invite all to try the new SU2 OPEN BETA with this new feature (it's defaulted ON) to confirm its effectiveness. Preliminary testing looks positive but it is still early.
Please give 9144 a test and let us know your results. Thanks!
First, our findings from more testing and examination over the past few days:
We've found that there is an override of the wind speed maximum value capped at 150.0000649kts (77.1667mps) internally in the MSFS UI code, which not only clamps/limits max wind speed, but causes a zeroing of wind speed as winds approach this (~149 knots, depending on some units conversion and variable resolution) due to an apparent bug. It not only limits the UI-settable speed, but also the internal weather listener preset data update logic to apparently ensure that UI-based add-ons cannot set a higher wind speeds. We are not sure when this limit was added, but we suspect it was done approximately late October or early November based on reports that we received during that time frame. We're not sure the reason this was done or exactly when it was done. It could just be an oversight/bug. It could have been for a long time and we just now noticed. We recommend that users request a higher settable wind speed in the weather layer UI configuration that will also allow add-ons such as ASFS to set higher speeds. Perhaps with enough demand/interest they will consider "fixing" this.
The wind speed zeroing is likely the main culprit of reported wind shifts over the past few months, when flying in areas/altitudes where wind speeds exceeded this per the real conditions data. This has been "resolved" by ASFS B9144, just posted, by adding a new wind speed limiter option (sim depiction options) which default to 148. We've also added source data modification to match this maximum setting so that flight planning/briefing using ASFS is all consistent based on this. You're free to set a higher speed, but if higher than 149 knots is experienced, you will get zero winds, based on all our testing, so we don't recommend increasing this speed unless a new MSFS build releases with a fix here.
The second cause of wind shifts found was due to a long-standing bug in MSFS wind code that we have observed for many years, related to some kind of normalization or vectorization issue where winds that go back and forth through clockwise or anti-clockwise rotations during climb or descent can cause "wrong way" interpolation/smoothing as well as hard reset of direction unexpectedly. We've resolved this in the past with our direct wind control, but until now, this was not something we've been able to achieve in MSFS. However, with B9144 just posted, we have introduced experimental DWC which should, in theory, control all aloft winds and prevent further wind shifts. We invite all to try the new SU2 OPEN BETA with this new feature (it's defaulted ON) to confirm its effectiveness. Preliminary testing looks positive but it is still early.
Please give 9144 a test and let us know your results. Thanks!
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Have you posted a thread in MSFS DevSupport about it? Users requesting it is one thing, but since you're a dev for a pretty popular 3rd party add-on, wouldn't it help to post your findings in the forum dedicated for 3rd party developers to reach MS/Asobo reps?