Regional   Atmospheric   Soaring   Prediction

Decentralised forecasts for the Western Cape Province of South Africa (SA, Western Cape).

BLIPMAPTM = Boundary Layer Information Prediction MAP.
This software was created by Dr. John W. (Jack) Glendening, Meteorologist.
These forecasts were run using a locally-run WRF model.
These forecasts have been run on computer(s) and published on a website located in South Africa.
These pages are maintained by Ian Forbes of the Cape Gliding Club.
Bandwidth and computing resources to generate and publish these forecasts has been supplied by ZSD.

Links to Forecasts:

Notes on forecasts:

Forecast Times:

Please check the date and time indicated at the top of each graphic before looking at the detail. There are two pieces of information:

Archived forecasts:

Archives of forecasts have been published here. Forcasts going back to November 2005 are available. Only the 14h00 forecast for each day is available. When the model was run multiple times for forecasts 48 hour, 24 hour, 12 hour etc in advance, only the most recent forecast has been published. Publishing of archived forecasts is currently done manually (hopefully this will change in the future). In the meantime I will try and update the archive a few times during the season. If you want access to a recent forecast that has not yet been published on the archives, send me an e-mail. Only the raw files are on this site, there are no pretty indexes. You will have to navigate your way to find the desired year/date and then download the graphics which interest you. (Look at the file names for a recent forecasts to guide you). Note there will be some days missing. There were occasions when the model crashed and no forecast was generated. In these cases there might be an older forecast for the same day available (eg 24 hour instead of 12 hour). Occasionally you may even find high resolution graphics are from a different run than the low resolution graphics. Check the headings on each graphic carefully! There was a redesign of the model in 2013 from April onwards the new forecast with 4km and 1.3km graphics replaced the old one with 12km and 4km graphics. There was a period of overlap when both models were run, but I have only published archives of the highest resolution forecasts available.

Some trivial statistics:

(Approximately correct at the time of writing, August 2016). Since we started running these models we have logged:


If you have any questions or feedback regarding the RASP software, please join the RASP forum and publish your comments there. They will be read by all users of RASP world wide, including Dr Jack, author of the software.

If you have any queries regarding the local publishing of these pages, please post a message on the CGC Discuss mailing list. I assume that most keen users of these forecasts are already on that list. If you interested in soaring weather in the area of these forecasts, you are welcome to subscribe to this list, even if you are not a member of the Cape Gliding Club.


If the forecasts don't appear when expected, or if you find a particular bug, you may e-mail me directly, or if it is seriously effecting your task planning, you may even send me an SMS, but please don't phone me either at home or at work.


Use this information entirely at your own risk! There is no guarantee that there will be any similarity between the forecasts and the actual weather. There may even be fundamental errors - like I may have typed in the co-ordinates wrong or that the time clock on my computer may be out by a few hours!