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-   -   SkySight forecast available for SW USA (http://www.aviationbanter.com/showthread.php?t=229154)

JS March 13th 17 07:41 PM

SkySight forecast available for SW USA
 
As used at the recent WGC in Benalla... An excellent forecasting tool has been released in the USA, first available for the SW. More to come?
https://skysight.io
I have flown using Matthew Scutter's SkySight website when in Australia and found it extremely useful.
Jim

Mike the Strike March 13th 17 09:26 PM

SkySight forecast available for SW USA
 
On Monday, March 13, 2017 at 11:41:59 AM UTC-7, JS wrote:
As used at the recent WGC in Benalla... An excellent forecasting tool has been released in the USA, first available for the SW. More to come?
https://skysight.io
I have flown using Matthew Scutter's SkySight website when in Australia and found it extremely useful.
Jim


The graphics are well done and a very useful selection of parameters - I will be evaluating this with my other forecasting tools.

What model does it use for the Western USA?

Mike

JS March 13th 17 10:07 PM

SkySight forecast available for SW USA
 
On Monday, March 13, 2017 at 1:26:25 PM UTC-7, Mike the Strike wrote:
On Monday, March 13, 2017 at 11:41:59 AM UTC-7, JS wrote:
As used at the recent WGC in Benalla... An excellent forecasting tool has been released in the USA, first available for the SW. More to come?
https://skysight.io
I have flown using Matthew Scutter's SkySight website when in Australia and found it extremely useful.
Jim


The graphics are well done and a very useful selection of parameters - I will be evaluating this with my other forecasting tools.

What model does it use for the Western USA?

Mike


Walt Rogers has been comparing it to other forecasts, including HRRR. Believe he's traveling now and will likely comment later.
Jim

[email protected] March 14th 17 12:07 AM

SkySight forecast available for SW USA
 
Looks interesting. Would love to hear what Walt has to say.

[email protected] March 14th 17 06:34 AM

SkySight forecast available for SW USA
 
It uses wrf iirc

WaltWX[_2_] March 14th 17 07:07 AM

SkySight forecast available for SW USA
 
Walt Rogers "WX" REVIEW of Skysight - Service announced today...
Western and Eastern U.S. domains

I first learned of Skysight in late 2016 from Jim Staniforth, who was impressed by Matthew Scutter's work. I browsed it just before writing my Soaring article published in February 2017 and included it a table of soaring web services. My first introduction came when briefing the U.S. Team in Benalla during several weeks in January.

Overall I'm very impressed. Matthew Scutter bases his work on Dr Jack's RASP software. It is running one of the later versions of the U.S. community WRF numerical prediction model at something like 3-4km resolution (comparable to NOAA/NWS's HRRR model - which also uses the very same model framework).. Matthew is forecasting for seven domains in the world: East, West Australia, Alice Springs, East and Western U.S., Europe and South Africa. A model run is produced before the soaring day starts... and in the evening for the next day, plus three additional soaring days. There is a total of four days forecast: Today, Day+1 (tomorrow), Day+2 and Day+3. Each model run is initialized by the U.S. Global Forecasting System (GFS) model for each of the days. It's amazing what one person can do with cloud computing resources! Over 2 terabytes of data are moving around each day! Matthew is ... or was....a Google software engineer with cloud infrastructure experience, skilled at managing a large deployment like this (also with several years of running RASP). From now on he will be working full time on the project (not counting the time flying his Discus 2A in 1000km flying weather:). Matthew is Junior World Soaring champion and competed at Benalla 2017 for the Australian team.

My initial impressions are that Skysight is a major contender as a world class soaring forecast service. It is not as polished at TopMeteo, but can be expected to be constantly improved over time. Forecasts of thermal height (soarable height Hcrit) and thermal strength are comparable to all the services from my spot checks during the last several months. XCSkies covers soaring over the world using the U.S. GFS model and also performs quite well. Although, lately XCSkies has not shown any indications of new development.

Take one day as an example ... Mar 13, 2017 valid time 21GMT (2pm PDT). I have compared graphical forecasts for Skysight, XCSkies, DrJack and TopMeteo for the SW U.S. concentrating on a small region in my neighborhood around Mojave, California. Here, I've posted a folder of screen shots for thermal height (Hcrit) and thermal strength in a Dropbox folder for you to compa

bit.ly/SkysightCompare_20170317

My Comments comparing this one day... also based on a general impression of how all the services perform:

Skysight wins in the comparison of both time and spatial resolution (horizontal detail; 30minute time resolution). So far, thermal height (Hcrit) and thermal strength are comparable to DrJack with the NAM (to be expected)... even comparable to XCSkies when looking at their GFS and RAP output. Surprisingly, the XCSkies NAM output looks "hot"... too strong thermal strength. DrJack is of course much harder to read the fields and coarser in resolution. TopMeteo uses double digit thermal strengths on their charts. TopMeteo from my experience tends to run "conservative" on thermal heights/strengths... but not unreasonably so. All services except DrJack legacy provides 4-5 day forecasts.. but Skysight provides high detail (time and resolution) after day one. In todays numerical weather prediction world, it doesn't make any sense to operate at any higher resolutions than 3-4km... because the physical simulation of thermal prediction don't work well at higher detail.

XCSkies in my opinion has a slight edge in the UI department. It's easier to read model winds plotted as wind vectors over the colorized fields. Skysight's embedded streamline vectors over the color contoured graphics on top Google Maps gets washed out. I'm finding that I use the slider to change transparency a lot ... first to geolocate myself, then to clearly see the colorized fields and interpret them numerically. I like having some vector lines of reference like roads on XCSkies maps because I then don't have to constantly fiddle with transparency. Skysight's UI is not bad... a close second... but needs improvement.

Skysight is being actively developed by a young, and energetic software developer with loves to fly gliders. Quitting your day job to start such an ambitious undertaking is a big motivator. So, we'll be seeing and hearing a lot more from Matthew. Even though TopMeteo has a strong team of skilled modeling/science professionals who are also glider pilots... they had better keep an eye on Matthew's project.

Walt Rogers "Wx"

WaltWX[_2_] March 15th 17 12:53 AM

SkySight forecast available for SW USA
 
Updated my sample graphics under the bit.ly link:

bit.ly/SkysightCompare_20170317

to include HRRR model forecast for same day and hour, 21Z, showing thermal strength (wstar), thermal height (max soarable TI=0) pblmsl, and winds at 80 meters agl vectors, wind speed. Also includes convergence of wind field at 80meters agl. These calculations are based on my ncl version of DrJack's parameters displayed in the Integrated Data Viewer (IDV) from Unidata.

Walt WX


[email protected] March 16th 17 12:24 PM

SkySight forecast available for SW USA
 
G'day folks,
I run SkySight.io, I'm thrilled people are liking it.
I've been working on the US version for a few months now with the support of a few prominent US pilots (JS & Walt included), but development never stops and I'd love to hear what you'd like to see next.
If you have any questions, feedback or comments, please do drop me an email at matthew -at- skysight.io.
Further, I'm happy to sponsor prizes for your competitions too and generally get involved in US gliding - planning to do a tour of your gliding clubs next year as well.
Cheers,
Matthew Scutter

Tom BravoMike March 16th 17 04:13 PM

SkySight forecast available for SW USA
 
Get to know Matthew Scutter on YouTube:

https://youtu.be/htANHB-L_zI

Matthew, I like your approach to gliding and especially the thorough preparation ahead of planned flights.

Tom BravoMike

[email protected] March 16th 17 10:18 PM

SkySight forecast available for SW USA
 
On Friday, 17 March 2017 01:43:28 UTC+10:30, Tom BravoMike wrote:
Get to know Matthew Scutter on YouTube:

https://youtu.be/htANHB-L_zI

Matthew, I like your approach to gliding and especially the thorough preparation ahead of planned flights.

Tom BravoMike


I have videos on how to use SkySight.io to plan your task around the weather, I have instructional videos on this too.
https://www.youtube.com/watch?v=8RIN0086LzY


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