Weather

Little Navmap can display weather as METARs and decoded weather in the information window and tooltips as well as weather symbols on the map.

Weather can be taken from the following sources:

  • FSX or P3D if connected. This also applies to network setups.
  • X-Plane real time weather from the METAR.rwx file. Not available when Little Navmap runs on a different computer than your flight simulator.
  • NOAA online weather service
  • VATSIM network online weather service
  • IVAO network online weather service
  • HiFi Simulation Technologies:
    • Active Sky Next (ASN)
    • AS16
    • Active Sky for Prepar3D v4 (ASP4)

You can define in the Options dialog on the Weather tab which sources are used to display the METAR information in tooltips or the tab Weather in the Information dock window.

You have to set the base path for X-Plane in the Load Scenery Library dialog to enable reading of the weather file. Certain features like regions of manually created weather files are not supported.

METARs are shown in the airport tooltips and on the Airport overview tab. Decoded weather information for all sources is available in the tab Weather.

The date and time information of the decoded weather display is highlighted in red if the METAR information is older than six hours.

Notes about X-Plane weather: Little Navmap can only read the X-Plane METAR.rwx file which contains downloaded online weather. The program cannot read custom weather situations from X-Plane. If you use custom weather, Little Navmap only has access to the local weather around the aircraft. Be aware that Little Navmap might display information from an obsolete or inactive downloaded weather file.

Also, weather and nearest weather in X-Plane might be inaccurate. This is due to interpolation between weather stations. Another problem is X-Plane falling back to default weather if a METAR cannot be decoded although it is reported correctly in Little Navmap.

Weather tab

Picture above: Decoded weather information from X-Plane and NOAA. The weather symbols on the map use NOAA as source (suffix - Map after the flight rules). X-Plane weather is older than six hours and therefore highlighted red.

Weather Sources

Flight Simulator

Weather information from a flight simulator or the X-Plane METAR.rwx falls in one of three categories, depending on the selected airport:

  • Station: The airport has a weather station. This is the most precise weather indication.
  • Nearest: The selected airport has no weather station and the report from the closest existing weather station was fetched. The ident of the closest station as well as distance and elevation are shown in the METAR and on the decoded weather tab. Note that the this weather station is not necessarily an airport.
  • Interpolated (not for X-Plane): The weather is interpolated by the flight simulator using three stations closest to the selected airport. FSX and P3D only provide non-interpolated weather for airports close to the user aircraft. The weather for other airports is always interpolated. The ident of the selected airport is used in the METAR report for this kind of weather report.

The flight simulator weather is updated every 15 seconds to catch manual changes or changes in the weather theme.

Little Navmap watches the X-Plane METAR.rwx file for changes and will apply updates immediately.

Note that the nearest weather will not necessarily depict the weather at the selected station due to the interpolation between multiple stations which is done by the simulator.

Online - NOAA, VATSIM and IVAO

Online weather from both sources is updated every 10 minutes.

Active Sky

All Active Sky programs are recognized automatically on startup for each simulator. The current_wx_snapshot.txt and activeflightplanwx.txt files are loaded and monitored for changes. Weather will be reloaded and updated in the information display if necessary.

You can also select the current_wx_snapshot.txt file manually. In that case the METARs from this file are displayed for all installed flight simulators. The activeflightplanwx.txt will be loaded from the same directory.

Manual file selection can also be useful if a new Active Sky version is not supported by Little Navmap yet.

Departure and destination weather will be displayed if a flight plan is loaded in one of the Active Sky programs. A suffix Destination or Departure will indicate the usage of Active Sky flight plan weather on the tab Weather. This gives Active Sky users the most precise weather indication for departure and destination.

Note that the indication of Departure or Destination depends entirely on the flight plan loaded in Active Sky and not the flight plan in Little Navmap.

Airport Weather

Little Navmap can show weather symbols for airports having a weather station for all available weather sources. Select sources for display with the Airport Weather Source menu item.

Note that airport weather is only displayed for stations and not interpolated. Stations which are not airports are not supported.

A suffix - Map is added to the flight rules in the METAR and decoded weather display of the information window and tooltips to indicate which source is shown on the map.

See Legend - Airport Weather for an explanation of the symbols.

Airport Weather

Picture above: Weather situation around New York. All airports are VFR and low winds.

Winds Aloft

Little Navmap can download and display winds aloft based on either X-Plane or the National Oceanic and Atmospheric Administration data.

The latter one are winds aloft forecasts which are updated four times a day and are used by most simulators and weather programs as data source. The wind speed and direction is arranged in an one-degree grid.

Little Navmap can display a wind barbs grid for a selected wind layer or at flight plan waypoints. Tooltips at the wind barbs show wind details for several layers at the position.

Hovering the mouse over the elevation profile shows the wind at the flight plan position. See Flight Plan Elevation Profile - Top Label.

Winds are used to calculate flight time, trip fuel, block fuel, top of descent and top of climb.

A manual wind setting for cruise altitude can also be used. See [Aircraft Performance - Buttons] (AIRCRAFTPERF.md#aircraft-performance-buttons).

See Legend - Winds Aloft for an explanation of the wind symbols and Options - Weather for more configuration options.

Select wind data source for display with Wind Source.

Wind Levels Button Wind Levels Button

Same as Wind Levels Menu.

The menu button enables or disables wind aloft display by a wind barb grid at different layers as well as at flight plan waypoints.

The drop down menu has the following items:

  • At Flight Plan Waypoints: Toggles wind barbs with a yellow border at flight plan waypoints on and off. Wind barbs below 4000 feet above mean sea level are omitted. This function is independent of the selection below.
  • None: Do not show the wind barb grid. Wind data is still downloaded and processed until the source is set to Disabled.
  • Ground (only NOAA): Show the wind barb grid for winds near ground (about 260 feet). Only available if the NOAA wind source is selected.
  • At Flight Plan Cruise Altitude: Show the wind barb grid for winds at the current flight plan cruise altitude.
  • At 5,000 ft - At 45,000 ft: Show wind barb grid for the selected altitude.

Tooltips

The wind barbs show an optional tooltip with wind direction, speed and wind source if you hover the mouse over them.

Direction is magnetic per default but can be changed in the options dialog on page Units. These tooltips show the wind for all layers where the currently shown layer is highlighted bold. The cruise altitude is added as an extra layer if selected for display.

Winds Aloft

Picture above: Winds aloft display with tooltip at wind barbs in grid and wind drop down menu.

Winds Aloft at Flight Plan

Picture above: Wind barbs shown at flight plan waypoints and wind data in tooltip.

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