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?
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????
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.
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".
Another comment that I wanted to add.....
Again with VFR option, and in this case concerning Tstorms:
1/ The RH as a proxy for cloud may not always work for cellular convective situations. I have marked out specific regions where the EC model is indicating a line of TStorms on the Rain/Tstorm layer and the Cloud Top layer.....however the RH display in the Route slice only presents cloud below 6000ft. NB: this is consistent with the RH fields found within the area display when you ascend and descend through the available layers. The cloud top layer shows a distinct line of elevated cloud abv 50k ft and would be best avoided.
NOTE: I read in your comments that you will be attempting to add an IFR option for the upper level fields. Could you include a graphical feature OR a line along the bottom of the cross section highlighting "Cloud Top" values???
I would also support upper level isotach lines showing jet streams (80/120/160kt etc) and regions of significant vertical wind shear.
2/ A comment regarding the weather/rainfall along the cross section.....the users need to be aware that the rainfall towers/weather(in this case TS's) are for the previous 3hrs hours from the forecast time. I have highlighted this in top image. Just so the user is not critical of the model output when they see rain/weather at a distance point along the route following a weather system OR think that the weather system providing the precip is some x100km wide.
3/ The cloud base....I'm not a great fan of this field (cloud > SCT) when in the case of these tropical Tstorm situations (see above) the cloud base forecast is >8000-12000ft - which is not the case for this region. I like the addition of the DewPoint spread which as least gives an approximation potential cloud base (1-8 Oktas) -- DewPointSpreadx400ft - and again would be better suited to any VFR pilot.
AND finally.........I can see the benefit of "Relative Wind" vectors from a flight planning perspective. But I would also favour "Absolute Wind" vectors from a forecasting perspective. And the official forecasts are all in Real/Absolute wind directions which would make it easier to evaluate the Windy forecast against other official forecasts.
Thanks for the all the effort.........I look forward to utilising this feature.
Congratulations gang for another amazing feature within Windy.....I have long been anticipating something with this type of functionality for forecasting purposes. VERY NICE.
As this is still in development/testing phase, could I add some comments to the general discussion?
You might need to make users aware that the freezing level is "height above terrain". I added an image displaying the freezing level rapidly decreasing with height passing over the NZ Alps. This could cause some concern for a VFR pilot considering Icing conditions overflying elevated terrain when in reality the freezing level could be well above the intended flight path. I did a search through the EC data fields and found no fields that map freezing level abv MSL.
As a future addition....could you include the temp at the corresponding height at the head of each wind barb.
The current freezing level line also gives a wrong indication of snow line across the Alps - it appears as if snow will fall to very low levels over the Alps.
Am I right is saying the times related to the solar time bar (on the left) are based on local computer time?
Could you include an input option to set a Universal Time Coord (UTC) ie, for Sydney Aust +10, which will then convert all times to UTC in the solar time bar.
This would then allow me to move the cursor around the world and attain the relevant solar rise/set times in UTC time as opposed to the local (computer time).
Otherwise, handy plugin....thx.