On this page you will find a general description of the four most popular virtual aviation weather engines and texture generators:
1. Active Sky Next (ASN)
2. FS Global Real Weather (FSGRW)
3. OpusFSI
4. Real Environment Xtreme (REX)
Active Sky Next (ASN)
The weather engine ASN (Active Sky Next), like FSGRW, OpusFSI or REX updates the weather by downloading the latest information from the internet. There is also a possibility to use historical data (up to two years back).
ASN, FSGRW and OpusFSI use the default FSX cloud texture sets. So those weather engines can benefit from additional cloud texture sets (from REX for example) for a better visual depiction.
The cloud locations and coverage are accurate as well as realist. Thick overcast layers can be displayed. The cloud transitions are smooth, as well as the vertical variations in temperature, wind speed and wind direction.
Cloud-based effects include in-cloud reduced visibility, related turbulence (in cloud or when entering or exiting a cloud formation), accurate position of precipitation according to the type of clouds and to your position relative to the cloud formation.
Microbursts, wind shears, hail, turbulence as well as updrafts and downdrafts effects are modelled for thunderstorms. There are aural wind shear alerts when flying through a thunderstorm cell: That will nonetheless not be of great help if you attempt to cross a strong thunderstorm as, like in real life, you might not succeed…
You can use the radar to navigate through bad weather since radar and cloud positions are synchronized. The radar shows the intensity of precipitations as well as the echo tops.
Voiced warnings will be triggered when new Airmets and Sigmets are issued. They cover the world and can be viewed on a map. Associated icing and turbulence are added according to the warnings.
In flight, you can receive voiced weather updates through ATIS, FlightWatch or FSS.
ASN corrects the problems sometimes associated with low-level clouds, like inaccurate coverage and wrong position of the clouds, or layers that are really too thin.
Like with other weather engines, there is a flight planning mode. You can enter, import, or build a flight plan, as well as change the flight plan and waypoints at any time before or during a flight.
The weather, airports and navaids are displayed and can be edited, added or erased. The forecasts are available through graphics or text. If, along your route, there is no Metar issued for few hours, the engine will use the forecast to update the weather.
The thermals are modeled using the temperature and surface of terrain.
The wake turbulence trails are visible and, like in real life, are moving with the wind.
ASN does not rely only on interpolation to cover the oceanic areas and other territories where there are few weather stations.
The developers of ASN say that they have created a realistic hurricane simulation based on actual hurricane data. Their program would automatically disregard the ground data that seems incorrect. I cannot comment about the realism of that simulation since I have not tried it yet. But if it is correctly modelled, this function should interest whoever wants to experiment what it is to fly in or near a hurricane.
ASN is compatible with FSX, FSX: SE and the different P3D versions . It can support a multi-monitor setup.
I am not listing all the characteristics of this interesting software since there are always new options added. If you want more details, I provided the link below. Like with all the other weather engines, take the time to see what each has to offer since they have quite different features and spectrum of options.
Here is the link: Active Sky Next
FSGRW
FSGRW is a weather generator and it uses downloaded data from the internet to simulate actual real weather all around the world (24,000 + airports).
The program simulates very well what is going on in the atmosphere up to FL520, including the depiction of hurricanes and tropical cyclones.
FSGRW does not come with its own cloud texture packages. Like for ASN(Active Sky Next) or OpusFSI, you must add a texture package from a third party (like REX for example). FSGRW will then use those beautiful textures to represent the downloaded weather from the internet, instead of the old cloud files that were created years ago by Microsoft.
FSGRW was not created to give you access to all kind of fancy options like automatic connections to the weather radar of big airliners. It is a simple but very efficient program that aims at representing the weather accurately.
FSGRW includes some well-known local weather effects.
FSGRW is compatible with FS2004, FSX, ESP, and the different P3D versions. It is compatible with X-Plane 11.
FSGRW gives you the possibility to use the actual weather present at one airport and transfer it to another airport. You have access to historic weather through a file-mode option. You may also choose to fly with dynamic or static weather. The weather updates are made every six minutes now that version 027 has been issued.
You can create your own flight plan and weather sequence.
FSGRW can be used through a network.
I own FSGRW and use it in combination with REX texture packages. I am very satisfied of the result. But I don’t doubt that ASN, OpusFSI or REX weather engines can provide excellent results as well. The only thing to remember is that you have to buy a weather engine AND cloud texture packages in order to improve the virtual weather’s visual aspect.
Here is the link: PILOT’S
OpusFSI
It used to be called OpusFSX, but that was before P3D arrived on the market. Now it is OpusFSI (a more generic name applicable to many platforms)
OpusFSI is a weather engine which, like FSGRW, ASN or REX, downloads real live weather close to your route and integrates it in your computer so that your virtual flight is always done in actualized weather. All those programs will update the data more frequently if the weather deteriorates along your flight path.
OpusFSI does not add new cloud texture sets. If you wish to fly in more interesting clouds, you need to use OpusFSI in combination with REX.
Opus works well on a network, which is practical if you want to transfer some OpusFSI functions towards a second computer to limit the use of the main computer’s resources.
OpusFSI is compatible with FSX, FSX: SE and P3D and even with TrackIR real-time 3D view controls (some files will have to be deactivated in the Program Files if you were using TrackIR before buying Opus). You have access to multiple interactive maps to check the weather or SIDs/Stars and to adjust the many options according to your taste.
OpusFSI is quite an advanced program that is well adapted to the use of virtual cockpit cameras. It replicates head movements caused by vibrations or turbulence and allows views from left to right when taxiing or turning in flight. The effects are all adjustable by the user.
If you are using many computer screens for your virtual flight, you can program each screen to show a different view (like the left and right window, for example).
OpusFSI allows you to use historical weather. The program also offers the possibility to relocate the weather over an airport towards another one. As well, you can decide to make some low clouds disappear or eliminate any obstruction to visibility when you want to have a perfect view of the territory. You can even create your own Metar.
Like for other weather engines on the market, you have access to a “flight planning mode”.
An option allows you to include turbulence and wind shear caused by the surrounding terrain within 80 kilometers of an airport.
The data generated by OpusFSI can be used directly in the PMDG B737NGX. That means you can see the real weather on the aircraft’s radar.
OpusFSI is in continual development and new functions are frequently added. They are not all mentioned in the present article.
Like for other weather engines available on the market, it is necessary for you to visit the company’s web site in order to choose the most appropriate software that will be adapted to your type of virtual flying and to the equipment that you use or intend to use in the future.
Here is the link: OpusFSI
REX
REX offers a weather engine that downloads real weather in your computer while replicating the different weather phenomenon.
REX sells several products aimed at flight simulation for MSFS 2020, P3D and FSX. Here they are:
For MSFS 2020: AccuSeason, Real Global Airport Textures and Weather Force .
For FSX and P3D 1,2,3,4, 5+: Sky Force 3D.
For FSX and P3D 1, 2, 3, 4: Worldwide Airports HD and Texture Direct / Soft Clouds Enhanced.
I do not have P3D so cannot comment on the REX products. But I fly with MSFS 2020 and FSX, and am satisfied with Weather Force, although the automatic stations sometimes take control of a gigantic portion of the sky and the weather engine takes a lot of time to adjust to the real situation. So it could get some improvments.Texture Direct / Soft Clouds Enhanced works well for me in FSX.
Weather Force is a Metar-based dynamic real-time weather engine for MSFS 2020. The weather changes as you fly from one region to the other, based on what is reported by the station on the ground (that includes manned and automated weather reports). The clouds are also very realistic.
With Weather Force, you can decide to inject the weather you like for a specific airport, or you can fly either with live weather or even DCWS, which stands for Dynamic Changing Weather Scenario.
REX has been on the flight simulation market for many years and the company constantly issues new updates as required. If you have to write REX about an issue, you can count on the support.
Here is the link: REX