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This might help explain how ECMWF calculates the surface wind and gusts speeds.
https://confluence.ecmwf.int/display/FUG/9.3+Surface+Wind
In my view, this is not a perfect relationship for gusts and I have seen many situations where the forecast gust speed has been over/under estimated.
I have a question related to the data point spacing on the Route Cross Section and ECMWF resolution?
Out of curiosity, I was looking at the data point spacing along the Route Cross Section window and determined that the distance spacing came out to approx 11km (or 5 data points across 53-55km). This was roughly the same for near the equator and close to the pole.
The ECMWF state a grid point resolution of ~9km (as per Windy info window) for the Hi-Res model.
@marekd , are you sampling actual data points along the cross section path OR interpolating the data at an increased spacing (~11km)?
Regards Stitch
I too would like to see the 250hpa wind barbs added to the IFR cross section window - this flight level "FL340" is very useful like FL390 for commercial aircraft operations.
Regards
@marekd ,
I'm loving it :)
Just had to get my head in the right space wrt ISA+/- . After a quick bit of Googling I can see the benefits of ISA esp with the tropopause highlighted and areas of potential instability/lower level inversions & cold/warm air advection. Neat!
Are the bottom 2 rows "cloud base height" & "cloud top height"?
I can't wait to get my hands on the Beta product......great work!!!!!!
Is it possible at your end (coding wise) to add the height of the terrain to the fcst freezing height which should then give the true freezing height abv sea level?
Thx
Hi @marekd ,
could you check the "Freezing Level" line/trace in the cross-section display for the correct plotted height?
I have attached a screen shot (below) showing the EC forecast freezing height at Cootamundra (see picker) as 3000ft.
The cross-section freezing height line is up near the 2000m/6000ft level at the same point. The height of the topography is ~420m.
It doesn't look right????
Thankyou @marekd for the updated VFR display.
I greatly appreciate the work you (and the team) are putting into this product - which makes my work a little bit easier :)
I would also like to see "range rings" added as an overlay option.
With a settings feature which would nominate the number of rings and user nominated radial distances. And also include an option to display the user nominated set-up at a number of selected locations.
I have an interest in knowing when storm systems are nearing (or are forecast to penetrate) set distances from a number of locations of interest. This covers thunderstorms and regions of stronger winds assoc with tropical storms/cyclones.
Thx
Hi guys, on your VFR route cross-section, and I right in saying that the highest "Dew-point spread" value presented is 5°C?
Could you increase the highest value to say 12°???
This would give an estimated cloud base height range [when looking at boundary layer cloud physics] up to ~5000ft (or up to the CAVOK cloud base height) when using the following rule....." The difference between the dry adiabatic lapse rate and the rate at which the dew point drops is around 8 °C per 1,000 m. Given a difference in temperature and dew point readings on the ground, one can easily find the LCL by multiplying the difference by 125 m/°C (410ft/C°) - from Wikipedia".
Thx Craig