Windy is a very good weather app for outdoor activities, but it cannot be used as soon as you are offline.
So in any case you must rely on the advisories of local marine weather services via VHF, SSB HF or by GRIB files via satellite phone.
For 48h or 72h offline, I keep a screen video of the wind forecast for the next 5 days. But for long voyage there is no way to get weather prediction at sea from Windy.
Posts made by idefix37
RE: Pronóstico marítimo
RE: Colours on the pressure map
For a long time I have customized the colors of the Pressure layer so as to make it easier to identify the areas of high and low pressure, in red and blue with white in betwen. Recently Windy has introduced a new color palette for Pressure similar to my settings but with a slight different hue. For me this new palette is much better.
New Windy settings:
The white can be replaced by grey if you want to see the wind animation clearly when pressure is near 1013 hPa.
With the old Windy palette the wind animation was not so clear with Lows in white, as seen from an old post:
RE: Wind Values?
You cannot add wind values to the wind vectors, but it is possible to customize the wind layer colors.
The solution is to choose a different color for each 5 mph range for instance. This is what I have done with colors matching the Beaufort scale for the wind:
Note that colors are not smoothed and knowing your color settings you can identify the wind speed ranges e.g. the areas with a ...10-15 mph, 15-20 mph, 20-25 mph...wind.
RE: Annoing map labels in poland or Czechoslovakia
These labels need probably to be updated in OSM.
By the way, Czechoslovakia is no longer existing too ! 😁
RE: Conversion to PPM
SO2 data supplied by Copernicus are NOW corresponding to a column of this gas from ground to top of atmosphere and accordingly mg/m2 is the correct unit.
Please, the description of SO2 layer in the FAQ should be changed :
RE: What am I doing wrong. On the temperature layer, Windy.com flag says temperature back home is 91, but it is 82.
You already got several answers to the same question 2 years ago:
Have you tried all the models that Windy provides, ECMWF, GFS, NAM, METEOBLUE, and compared them?
Have you compared the temperature forecasts with local official weather stations?
For temperature, it seems that METEOBLUE (only available in Meteogram) matches fairly well a local Personal Weather Station (madis) close to your location :
Note that the Windy widget works only with ECMWF model and that METEOBLUE is not shown as a map neither in the weather picker (small flag), but only in Basic meteogram.
And as a conclusion the question is NOT "how accurate Windy is", because Windy does NOT make predictions, but just visualizes raw data from weather models run by major meteorological centers like ECMWF, NOAA,.... the right question would be "what is the best weather model for this location".
So which model do you use? They are 3 in you area : ECMWF, GFS and NAM. May be one is better for temperature forecast in Maine.
You can use these features to check which is the best one:
RE: Station close to Copiapó
Hi, there is a Sounding feature on Windy which could be interesting for you. It allows to get a profile of the atmosphere above your location as provided by ECMWF. Click the right button of your mouse to open it.
It shows 2 curves: the red one is the air temperature, the blue one the dew point. When the 2 curves are close together, there is a risk of clouds at this altitude (the water vapor condensates when the air temperature reaches the dew point). The profile changes when you move the timeline cursor.
So it's another way to estimate the risk of cloudiness. But I don't know if it brings really additional information compared to the Cloud layer as it comes from the same model forecast.
RE: Access to "Route planner"
That’s right, the route planner is not available on tablet via the app nor via the website... Hope it will be changed:
RE: Swell angle degrees missing on Android app
Are you talking about the slope angle of swell?
Breaking waves are observed near the seashore where the water depths are reduced and when the ratio height/wave length is about 1/7 i.e. the wave steepness dramatically increases.
Global waves models like ECMWF WAM and WW3 are not able to show that because their resolution is too low (13km and 22km) in particular to take into account a precise topography of seabed.
More info on surf breaks:
RE: Conversion to PPM
In the app, I see SO2 concentration in μg/m3 from GEOS-5 data:
But on website it is mg/m2 from Copernicus data:
It should be better to have the same data used both on website and in the app.
Anyway the mg/m2 are probably an error as the Copernicus website shows SO2 amounts expressed in μg/m3.
RE: Customize color isolines of atmospheric pressure?
No that’s not possible.
Not sure it would be really visible over layers in colours.
RE: Station close to Copiapó
If you cannot rely on this weather station for cloud coverage, on Windy you find forecasts from ECMWF and from GFS models:
As the effect on a PV solar plant depends probably on the clouds altitude:
High clouds layer
Medium clouds layer
Low clouds layer
Note that the density and altitude of clouds in Meteogram are not computed in the same way as the clouds layers.
And satellite observations in visible and infrared spectrum.
But I guess you already use them.
Then there is a Windy plugin (see Menu) which gives the Sun position at your location. Could be interesting ?
Dust storm in the Caribbean
As reported by CNN, The current Saharan dust episode is leading to the worst dust storm in the Caribbean in decades.
Last few days, the sky has turned brown with a dense dust haze in particular in Cuba:
Picture from BBC article:
As shown by the Dust layer on Windy, the dust plume is now extending up to the US and further north to Canada.
Dust layer with customized colors
RE: Terrain interfering with cloud viewing
It is difficult to distinguish ground and clouds when the ground is covered by snow. These satellite views in the visible spectrum are just a photography taken from the satellite. These are not "clouds above a base map". Do you know a camera which takes a shot of your friends with out any background? Of course it is possible to erase the background but not easy at all and not possible to turn off the terrain.
RE: Windy premium advantages
Here is an explanation from Meteoblue why they don’t provide data for the map, only for the Meteogram: