Wind direction over S. Paolo on 19 Aug /12 UTC , were:
at surface : from South 10~25 km/h
at 1000m : SSW 15 km/h
at 3000m : W 55 km/h
at 5500m : W 60 km/h
Satellite images for that day, can be found:
I'm a contractor in the US, weather dictates what I do day to day, sometimes hour to hour. I have searched forever to find a full screen radar page that loads fast with no clutter and and no ads all over the place. I also use a start page on my browser and this can be embedded into that page and is always current with out a refresh. When I click on the link itself that I have set my area to, it loads right away, no waiting. As for local forcast, I use weather.com, but their radar is horrid and loads slow.
WIndy load time is less that 1 second for every test I have run. They do have some errors that could be sorted but that is for IE, Safari, and a few Android versions.
Imo This is by far the absolute best out there. Granted I mainly use the radar, but I like the fact that I can also see real time lightning strikes and wind direction and speeds.
As far as ease of use, for me it is quite straightforward. The sidebar to set the layers I want to use is a plus. But for others it might be somewhat confusing.
Weather observations from METAR and SYNOP have the same accuracy.
METARs are half-hourly or hourly observations.
SYNOPs are observations made in a 3-hours basis (00 UTC, 03 UTC, 06 UTC etc).
Example: SYNOP at 12 UTC shows temperature 20C.
Next SYNOP at 15 UTC shows 22C.
METARS (for the same time period) may show:
METAR 12 UTC, 20C
METAR 13 UTC, 23C
METAR 14 UTC, 24C
METAR 15 UTC, 22C.
You are right, the cyclonic activity in the Atlantic is very low this year. But it could change this autumn according to this article: