FYI: Re the comment below,
Andrew wrote:Re: setting up a local Club RASP Page
See: TJ Olney's
a) Pacific Northwest RASP BlipMap Service (example) at: http://home.comcast.net/~wxtofly/blipspotWoodside.html
b) Pacific Northwest RASP Service (example) at: http://home.comcast.net/~wxtofly/
"I've been recently working on setting up a RASP for Pemberton.
There is no need to add observational feeds to our 24/36 hour runs as all of it has been assimilated into the data which I am pulling
... and by meteorologists not hacks like me.
So far I've been using the (freely available) 2.5km grid data from the Canadian high resolution local area model
(HRDPS: http://www.weatheroffice.gc.ca/grib/gri ... _HR_e.html
) which runs on the west coast
with some extra data from NCEP Model Analysis
for some of the less relevant parameters that the WRF model needs.
Peter managed to find us a cheap machine to do the runs on, a quad-core last generation processor, and I am providing internet, electricity, and hours.
It is about 4x slower than a top of the line server with quad-channel memory (approx cost $2000).
So far a 100x100km at 1km grid Pemberton model takes 5 hours to do a 24 hour forecast
(30 minutes of 1GB of data retrieval and assimilation and 4:30 of run time).
If I start getting interesting results I will move it over to my personal gaming machine
(which gets little use during the flying season) which will be about 2-3x faster (which means we could do coverage of the interior as well).
TJ Olney manages to run a 4km outer domain over the whole pacific north west and then a handful of
small 1km type grids local around interesting regions on a single machine with reasonable run times.
Maybe I can shrink the pemberton domain, but my gut says I need to expand it so the boundaries are
outside the coast mountains to remove the boundary "noise" due to topography mismatches between
models which will require more processing power... in the end my hopes for accuracy may be overly
optimistic anyway, so I wouldn't throw money at it yet. Later maybe we can offset my electricity / internet bills
The reason I'm not done yet (it's been a whole two weeks!) is twofold, first I am using a modern version of the weather models
(WRFV3.4) and second I am trying to use the HRDPS input data, both instead of the out of the box GFS/NAM solution by
Dr. Jack Glendening (though I would say a fair assessment of what comes out of the RASP box would be, appropriately,
a Jack in the Box). Oh, and third, I only have evenings to work on this
Another not out of the box solution is the google-maps based RASP visualization I'd like to get up and running
(see http://rasp.inn.leedsmet.ac.uk/RASPtabl ... bleGM.html
). I won't forget TJ's windgrams either,
which is the easiest way to get an "is it soarable" forecast.
The reason I am fiddling with data input and fine gridding, though, is that I am interested in capturing some of the local valley wind behavior
(for example, the feared Whistler Express) which requires some of the more interesting RASP outputs and likely careful modeling.
Of course, it may be that it is not predictable easily, but local lore has it that it correlates well with Howe Sound wind advisories,
so all I need to capture is whether that wind can move up the Whistler valley into the Pemberton valley.
(Just in case I fooled you with confidence, here's another reminder that I am not a meteorologist).
Generally, it's in support of some of my XC flying goals
TJ -- thanks for your input... I'll be back with real questions once I believe my model is giving reasonable results
(which will probably be on Tuesday or so since so far all it has been doing is raining and snowing up there which isn't particularly interesting). Bye! Andrew"