Posts made by aug1234

@Gkikas-LGPZ
Thanks so much for your answer.
I’ve just realized I was not predicting the correct wind speed after 2 years hahaha. I was always using the “search tool” entering the place and seeing the “basic model” just like this. I always thought that the search tool knew the point in the map with the correct altitude. And giving us the “surface wind” at that altitude.

Know I understand that maybe it works like this if it is in a really flat area, if not… probably the prediction for this point is some hundred meters below… so you need to change the altitude on the scroll bar or in the sounding forecast.

Thanks so much for all your comments! I really appreciate them!

@Gkikas-LGPZ
I would like to start by thanking you for the time and dedication you have invested in trying to help me solve my doubts. It is greatly appreciated and very helpful. I am a beginner paragliding pilot and I am starting to study meteorology.

From your last post, I have understood:

1. WX models approximate the real terrain relief, and this approximation is clearly seen in the sounding forecast in the model elevation section. So, I understand that the greater the difference between the real altitude and the model prediction, the more difficult it is to have an accurate prediction.

2. ECMWF (9km) means that this model has a resolution of 9 x 9 km, and the prediction is made at a mean altitude of the selected point, so predictions will be better in flat areas than in peaks, as the model altitude will be more similar to the real terrain altitude.

3. I have also learned to interpret wind direction in degrees, with North being 0º (simple, but I had never thought about what 40 degrees means). I understand it now.

4. From your last comment, I understand that the best way to know the wind prediction at a point is by using sounding and selecting the desired time and altitude.

5. I also found the link you shared very interesting.

Surely, by this point, I should have understood all your explanations, but I still have doubts. Could you tell me in simple words what the difference is between these two predictions? Same point, same time; one is surface wind at a point at 750m and the other is the prediction for a point at 750m where the point is at 750m altitude. I understand that selecting surface at this point is incorrect.

On the other hand, I now have three places on Windy where I can compare the wind for the same point and time:

1. The basic time window, where the prediction is 26km/h.
2. The general map where I can select the prediction altitude: surface (23 km/h) or at 750m (34 km/h).
3. The sounding, which with an elevation model of 586m predicts 32km/h.

Which of all these predictions should I assume will be on the slope for takeoff? Around 23 km/h or closer to 34 km/h?

Thank you very much for your help."

@Gkikas-LGPZ I really appreciate your comments thanks so much. Could you help me once more?
I’ve read your old post, and I understood : as the wind is “measured” at levels of pressure, then will be the same to compare the wind at surface in a spot which is 3000 m than set the altitude to 3000 m and select a point in the map which is at 3000 m. Is it right?

But then my results are not the same and I’m very confused. Thanks a lot

Please see this example
In picture one the wind is 11km/h for 16 h on Saturday
On the second picture is 21 km/h for the same point and same hour.
With the explanation from your post I’ve expected to have the same result as the two pictures are at the same level of pressure (hpa)

Thanks again

@idefix37 thanks a lot

@Gkikas-LGPZ Hello, but the village is at 750 m above the sea level, should be the same, right? Thanks a lot.

Hello,
Does anyone knows why for a same spot,time,model and altitude has different forecast?
For example on the first picture we have 28 km/h for icon eu model at 750 m which is the altitude for this village. At 15h
Then at the second picture the icon eu model says 22kmh for the same point and same hour.
Do you know why?.
Thanks a lot
Please check the pictures