Updated 03/11/2019

The VSAWeather Page from last year (2018) may be found here, but I have removed it from the menu bar at the top of each page.


RASP – Williams, aka 2-3 Day —

  • The Williams 2-3 Day RASP is the most accurate forecasting tool available to glider pilots at Williams

RASP – NorCal, aka Panoche, aka 7 Day —

  • The 7 Day RASP is very helpful since it provides a longer range forecast, and the turnpoints are selectable, but some say that model is less accurate than the Williams 2-3 Day, but there is no consensus  regarding accuracy.


  • Select any region in the USA.  Zoom in and pan to our gliding area.  Helpful for flights of greater than normal distances.

GG – Golden Gate —

  • GPS model (top section) is 12 hour increments.  ‘700mb/  at 12z/  All’ is commonly selected and used to show moisture at 10,000 ft. – From WSC pages –,38.177,-122.149,7,i:pressure,m:eKqacLA

  • Helpful for seeing the big picture, and, you can see forecast weather profiles, including soundings.

Discussion by National Weather Service –

  • Also, see…
  • The San Fran station has an ID of MTR ( see it at the end of the address line above re:Discussion)
  • The Sacamento NWS has an ID of STO

7 Day forecast NWS7-Day Forecast for Latitude 39.15°N and Longitude 122.13°W (Elev. 72 ft) – This is a good one that provides fcst several days more than the 2 Day Williams RASP, but most pilots agree the 2 Day Williams RASP is THE most accurate for a one day forecast.

Satellite Imagery   National Weather Service  (NWS)

GOES 17 Images of Pacific NW coastline – vivid color images of visible clouds (discovered by Pete-98 (1/2/19)

Spot Forecast by NWS

  • Stonyford  A good one to check if you are taking a mountain tow

For those pilots looking for standard pressure charts:  Cool weather page by Morgan 



Significant changes continue in the world of weather forecasting.

  •  The GPS weather model has often been shown to unreliable for forecasts more than four days (but Federal funding is supposedly improving, in spite of non-believers in global warming).  The European model is the best available.
  • provides just about all of the info you need for a forecast of more than two days – if you become adept at using menu choices, it’s like watching a TV show. See pressure patterns at all levels, moisture, temps, thus clouds as well as precipitation. Simply amazing. It’s no wonder why UNISYS was forced to shutdown – it was in need of a major overhaul.


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