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2018-12-29: NL using software WRF v3.5. Only "today" is available. Better and faster predictions should be coming.

Regional   Atmospheric   Soaring   Prediction
Boundary Layer Information Prediction MAP
The Netherlands, North Belgium and Northwest Germany

The atmospheric Boundary Layer (BL) is the vertical region above the surface within which air has been mixed by thermal or windshear eddies, i.e. the region where gliders, hanggliders and paragliders normally fly. The RASP BLIPMAP model is developed by Dr. John W. (Jack) Glendening and is a WRF model specifically adapted for these gliders. The basic parameters are described here and all parameters here. A description of all parameters in German can be found here. If you have any remarks or questions, please email
The model for today and tomorrow starts at 00 UTC and for the day after tomorrow at 06 UTC. For today and yesterday the results are available in 2 resolutions, 4 km ("coarse grid") and 1.3 km ("fine grid"). The area that's computed using the fine grid is much smaller than the area that's computed using the coarse grid. For tomorrow and the day after tomorrow, results are only available using the coarse (4 km) grid.
The results are available for today at 08:30 local time, for tomorrow at 09:30 and for the day after tomorrow at 10:30 at the latest and depending on the weather sometimes up till 30 minutes earlier. Animations have only been made for those parameters of which the legenda doesn't change througout the day. After midnight all results are copied to one day earlier. Due to this until 10:30 no results are available for the day after tomorrow. How actual the forecast is can be derived from the number of hours that is noted in each picture before the text "hrFcst@". This is the difference between the model starttime and the time at which the forecast is valid. If you have difficulties distinguishing colors then thishelps.

Other areas for which RASP BLIPMAP predictions are available on this server: North- and Central France
Overview of areas for which RASP BLIPMAP predictions are available world-wide

PARAMETERS [Description] Yesterday (coarse grid) Yesterday (fine grid) TODAY (COARSE GRID) (local time) Today (fine grid) Tomorrow The day after tomorrow
Surface Temperature    
Normalized Surface Sun    
Height of Boundary Layer Top    
Height of Critical Updraft Strength (<0,9 m/s)    
Maximum Thermalling Height including cloudbase limitations    
Thermal Height Uncertainty    
Thermal Updradft Velocity for 0,9 m/s sinkrate    
Buoyancy/Shear Ratio    
Thermal Updraft Velocity and B/S ratio    
Surface wind    
Boundary Layer Average Wind    
Wind at the Boundary Layer Top    
Boundary Layer Wind Shear    
BL Convergence    
Height at which BL Max. Up/Down Motion occurs    
Cumulus Cloudbase where CuPotential>0    
OvercastDevelopment Cloudbase where ODpotential>0    
BL Cloud Cover    
Surface Dew Point Temperature    
1 hr Accumulated Rain    
Vertical velocity at 955mb (m)    
Vertical velocity at 899mb (m)    
Vertical velocity at 846mb (m)    
Vertical velocity at 795mb (m)    
Vertical velocity at 701mb (m)    
Vertical velocity at 616mb (m)    
Vertical velocity at 540mb (m)    
Vertical Velocity Slice through location of Max. Vertical Velocity at wind-parallel angle    
Soundings and locations:
AMS (Amsterdam)    
EIN (Eindhoven)    
GRO (Groningen)    
DUS (Dusseldorf)    
BRE (Bremen)    
KAS (Kassel)    
HAN (Hannover)    
HAM (Hamburg)    
ERF (Erfurt)    
MAG (Magneburg)    
BRU (Brussel)    
LUX (Luxemburg)    
FRA (Frankfurt)    
NUR (Nurnberg)    
LIL (Lille)    
LML (Lemelerveld)    
Ground level  


Potential flight distance   Total