Mountain skiers

@Eand
You have probably an old iPad because the current version is iOS12.4

@hgwindsails
Here are the coordinate formats which are supported by Windy

https://community.windy.com/topic/7290/inserting-coordinates/2

It seems you use a mix of DD and DMM
(42.14.548,-49.18444.)

@tomhudu

As you probably know the shape of waves, in a given place, is a mix of different kind of waves:

The windsea (also called wind waves) is produced by the local wind.

The main swell is produced by a strong wind far away.

Secondary swells are produced also by winds far away but in other places.

All of them have different heights, come from different directions and show different periodes (which is the time between 2 wave crests)
Swell 1 is the main swell, swell 2 and 3 are secondary swells (the swell classification 1, 2, 3 depends on their respective height).

See also:
https://community.windy.com/topic/3361/description-of-weather-overlays

For example close to NewZealand coast you can observe different swell trains due to several storms at this season.

In this example, main swell is E-W and Swell 2 is S-N caused by 2 different storms.

@AndiDuen
In Thunderstorms layer, l/km2 means lightning per square kilometer.
The amount of rain is in mm or in inches, but never mm/m2. Sometime one uses l/m2 (liter per square meter).
10mm=10l/m2

@jpowell

Here is the description of layers:
https://community.windy.com/topic/3361/description-of-weather-overlays

Wind accumulation shows the areas of the map where the strongest gusts are forecasted over the next 10 days. So it gives the forecasted track of strong but concentrated storms like tropical hurricanes.

To turn off Reported wind click on the cross (empty map) .

@pavelneuman
OK well done. The title and the screenshot must be taken in the second degree !

@pavelneuman
Your article gives this information a sensational side while the situation is very commonplace. Indeed Chantal is a tropical storm (weakening to a tropical depression). The sustained 1-minute winds are 35kt as shown by NRL (weakening 30kt) in south semi-circle. In north semi-circle winds are very weak as displayed by ECMWF and GFS (they show only 25 kt in south semi-cercle)

So Chantal is not threatening this boat !

@CPBRA
This high concentration of PM 2.5 is probably due to wildfires near north boarder. They are confirmed by NASA observation:
https://firms.modaps.eosdis.nasa.gov/map/#z:7;c:18.9,-7.5;d:2019-08-20..2019-08-21;l:firms_viirs=D,firms_modis_a

And shown by CO layer on Windy:

These fires increase the content of PM 2.5 as displayed in you post and also the NO2 as below:

@Develper
Please find below information about the data source of Currents layer.
(BTW Information about each layer is displayed by clicking on the clock icon in low right corner)

Note that this prediction of currents is not accurate along the coasts. It does not take into account the tidal flow in the region where the tidal range is observable.

@btschumy
FL100 is a short cut for Flight Level 10000ft. So FL300 (or 30000ft) you should have clouds if their base is 28000ft.
Have you tried to see what the Clouds and High clouds layers shows near your location at same time?