This page discusses how you can use the RASP spot location graphs.


The RASP forecast covers the entire UK and provides forecasts at differing resolutions for up to one week in advance. However, the raw tabular data is great, but sometimes is difficult to get visualisations of what is happening. Examples include subtle temperature and wind changes as a front passes through.

Why are spot forecasts useful?

Well, if you're not going more than 5km from your launch site, the RASP forecast further afield is not that useful. This is probably when local you're soaring locally and a forecast for a turn point well help you if staying in one place.

Before having a look at the graphs on offer, a quick word on how to use the URL script parameters.

The graph scripts use the standard Internet method for sending parameters to scripts. Here, all the parameters use an ampersand (&) to state the parameter is coming next, followed by the parameter name, followed by an equals symbol (=), followed by the value. So in the rest of this page, bear this in mind if you wish to change the input parameters.

Using Turn Points
All the graphs provided are aware the three letter UK Turnpoint references. So for example, Lasham Club house paramter would look like the following:

  • &tp=LAS

Some points on usage and performance:

  • Make sure your turnpoints are in uppercase. Where the turnpoint is wrong, it will provide an error indicating the problem.
  • As always, when you have a graph, check the displayed Latitude and Longitude are reasonably close. Note that it may not be spot on, as RASP produces forecasts on a grid and the turnpoint may not be exactly on the grid, so it picks the closest forecast on the grid to the turnpoint.
  • The graphs are created "on the fly" every time. As such, the results are not instant so be patient. The actual forecast data is only produced once per day for two or more days away (at 12Km resolution) and and twice for tomorrrow (at 2Km  or 4Km resolution).

Ok, lets have a look at the graphs we can use.

Main Metrics
This script provides a graph of parameters from the RASP core data set to give an idea of boundary height and cloud base.
For Lasham Club house next Thursday using a turn point would look like:

http://app.stratus.org.uk/blip/graph/blip_main.php?day=Thursday&tp=LAS

And this would produce:

Temperature

This script provides a graph of wet/dry temperatures.

http://app.stratus.org.uk/blip/graph/blip_temp.php?model=UK12&tp=ABO


And this would produce:





Wind Speed
This script provides a graph of  wind speeds in Knots. Using Lasham Clubhouse again we get:

http://app.stratus.org.uk/blip/graph/blip_wind.php?model=UK12&tp=LAS

And this would produce:



Or for Aboyne next Saturday we would get

http://app.stratus.org.uk/blip/graph/blip_wind.php?day=Saturday&tp=ABO

And this would produce:




Wind Direction

This script provides a graph of  wind direction. Using Long Mynd we get:

http://app.stratus.org.uk/blip/graph/blip_wind_dir.php?model=UK12&tp=MYN

And this would produce:




Cu Potential
This script provides a graph of  Cu Potential. Using Tibenham in Norfolk we get:

http://app.stratus.org.uk/blip/graph/blip_cu.php?model=UK12&tp=TIB

And this would produce:



Sun
This script provides a graph of  Sun in percent. Using Hus-Bos for Sunday we get:

http://app.stratus.org.uk/blip/graph/blip_sun.php?day=Sunday&tp=HUS

And this would produce:





Rain
After the sun comes the rain. This script provides a graph of  forecast rain in millimeters per half hour. Using Milfield for Sunday we get:

http://app.stratus.org.uk/blip/graph/blip_rain.php?day=Sunday&tp=MIL

And this would produce:



'Stars'
Paul Scorer came up with an experimental rating system called stars. The metric basically states a higher number equals better conditions.  This is an experimental metric based on using data from other standard RASP parameters.

Using Gransden Lodge for Sunday we get:

http://app.stratus.org.uk/blip/graph/blip_stars.php?day=Sunday&tp=GRL

And this would produce:




Day Viewer for a Given Location

Other tools you can embed include a day viewer by turnpoint or latitude/longitude with a given day (use the parameters: &lat and &lon):

http://app.stratus.org.uk/blip/graph/dayview.php?lat=53.751&lon=1.20673&day=Sunday

Or by turnpoint:

http://app.stratus.org.uk/blip/graph/dayview.php?tp=LAS&day=Wednesday

These are without headers/footers so you can embed in another site.

Using Models instead of Days

If you are interested in a model instead of a day, the options are slightly different. The models available are:

  • UK2 and UK2+1
  • UK4, UK4+1 and UK4+2
  • UK12, UK12+1, UK12+2,UK12+3,UK12+4,UK12+5 andUK12+6
  • UKGM and UKGM+1
  • UKGW1 and UKGW1+1

Use the text model= followed by one of the models listed above. The turn point or latitude/longitude must exist in that region for the plot to succeed.


Using Today and Tomorrow (Days)

You can also just today or tomorrow. To go this way, use the &day option with &day=Today or &day=Tomorrow. Examples for Lasham would look like:

http://app.stratus.org.uk/blip/graph/dayview.php?tp=LAS&day=Today
or

http://app.stratus.org.uk/blip/graph/dayview.php?tp=LAS&day=Tomorrow