[ 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 or Grid Locations All the graphs provided are aware of RASP i/k coordinates or for easier use, you can use the three letter UK Turnpoint references. So for example, Lasham Club house would look like either of the following:
  • &i=1074&k=1657
  • &tp=LAS
... and are both valid. Some points on usage and performance:
  • Make sure your turnpoints are in uppercase. Where the turnpoint is wrong, it will default to my home turnpoint of Rattlesden (RAT).
  • 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 5Km 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 today using RASP coordinates, this would look like:
http://app.stratus.org.uk/blip/blip_main.php?region=UK12&source=remote&i=1074&k=1657
or for next Thursday just using the turnpoint reference:
http://app.stratus.org.uk/blip/blip_main.php?region=Thursday&tp=LAS
And this would produce:
Temperature This script provides a graph of wet/dry temperatures.
http://app.stratus.org.uk/blip/blip_temp.php?region=UK12&source=remote&i=1074&k=1657
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/blip_wind.php?region=UK12&source=remote&i=1074&k=1657
And this would produce:
Or for Aboyne next Saturday we would get
http://app.stratus.org.uk/blip/blip_wind.php?region=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/blip_wind_dir.php?region=UK12&source=remote&i=963&k=1381
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/blip_cu.php?region=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/blip_sun.php?region=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 Biscester for Sunday we get:
http://app.stratus.org.uk/blip/blip_rain.php?region=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 Biscester for Sunday we get:
http://app.stratus.org.uk/blip/blip_stars.php?region=Sunday&tp=BIC
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/dayview.php?lat=53.751&long=1.20673&region=Sunday
Or by turnpoint:
http://app.stratus.org.uk/blip/dayview.php?tp=LAS&region=Wednesday
These are without headers/footers so you can embed in another site. Note if you do not put a day in, it will default to today's forecast.
     

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BLIPMAP = Boundary Layer Information Prediction MAP - Created by Dr. John W. (Jack) Glendening, Meteorologist