[ RASP UK Forecast (Stratus) ]




RASP Graphs by Day

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 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 Bicester for Sunday we get:
http://app.stratus.org.uk/blip/graph/blip_rain.php?day=Sunday&tp=BIC
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:
http://app.stratus.org.uk/blip/graph/dayview.php?lat=53.751&long=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.

     

The Webmaster makes no representations or warranties, expressed or implied, as to the accuracy of the information held herein or its fitness for any purpose whatsoever. In no event will the Webmaster be held liable for any direct, indirect, special incidental or consequential damages arising out of the use of the information held on this server.
BLIPMAP = Boundary Layer Information Prediction MAP - Created by Dr. John W. (Jack) Glendening, Meteorologist