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8.33 radio frequencies
- After 03Jan2019 remaining 8.33 frequency conversions
will be notified via the Skywise
e-mail alerts system, so make sure your subscription requests the
- Check your e-mail for Skywise messages about frequency changes
and make sure your radio's presets are up to date if this change
- Pick a suitable forecast site from Weatherjack's weather data
and use it to see if the day is likely to be suitable for what
you have in mind. If you're in England south of the Pennines,
you have other choices, which include:
CGC Heads-UP weather forecast. This is only available during
the soaring season.
Gliding Club's forecast. There is usually one every
day, but poor days may be skipped.
Masson's Lasham weather briefing. David only does a
forecast if the following day looks promising and he has
- Check the synoptic charts and/or look at METARs to get an
idea of wind strength, direction, and how good the day is
likely to be. Use your favourite site:
- AvBrief (free
login access to 5 day UK Met Office synoptics and forms 214
and 215, subscription for additional services).
- Decode METARs from Worldwide TAFs
& METARs selected from the Avbrief Weather
This opens in a new window so you can cut and paste between
Avbrief and it.
- ECMWF is the
European Centre for Medium-Range Weather Forecasts: you can
use it to cross-check the UK Met Office forecasts if the
weather predictions look unstable.
Jetstream position forecasts, which are provided by the
ECMWF, can help you decide if an existing weather pattern
is being locked in by a southerly jet stream loop and, if
so, whether change is likely in the next six days.
- UK Met
Office provides a decent summary of expected weather for the
next few days. The amount of detail tapers off the further ahead
Volcanic Ash Advisories for the UK should be consulted if
ash from major eruption is reaching the UK.
- XC Weather.
shows current weather in a graphical map format. Each wind
arrow is associated with an airfield that provides METAR
information. Hover the cursor over a wind arrow to see the
decoded METARs and forecasts in the right margin. This site
will be opened in a new window.
- If there's a chance of heavy cloud or rain, look at the satellite
images to see what is in store:
resolution visible UK shows a cycle of the last two
hours images at 15 minute intervals. It links to a similar
cycle of radar rainfall images.
Weathercast has a weather radar display that cycles between
4 hours and 1 hour ago.
satellite images. Choose from:
- Geostationary satellite images. Choose
SEVIRI and then pick year, month, day, time and
channel from the menus. Channel 12(North) and Colour
are likely to be the most useful. This site requires
you to sign up for a (free) login.
- Search by area. Click the top left and
bottom right of the rectangle you want to see. Then
pick the satellite, the date range of interest and
whether to show a list or thumbnails. Click Query
database to get a list of suitable images. Pick one
and choose the channel you want to view, which varies
from satellite to satellite.
- Zoom Earth by Paul Neave,
Neave Interactive, provides two
zoomable, high resolution realtime images each day over the
entire globe. The first zoom levels use NASA's MODIS images at
from 5km to 250m per pixel. These images are no use for planning
flights, but are good for post-flight analysis or simply as
a record of the weather for that day. They display a control for
selecting an AM or PM image for the required date.
Zooming in further looses the data selection control as you switch
to less frequently updated images with much higher resolutions
(up to 0.5m per pixel).
- If volcanic ash warnings are in force, look at the Met
- Check the soundings using one of the RASP tools:
Now you have enough information to plan a task and
If you're doubtful about getting round, use the
Stratus Track Average tool to see if its doable and get a predicted
With the task planned you must check the NOTAMS for flight
restrictions and warnings.
NOTAMS from NATS
The following summary assumes that you're flying a closed task
from Gransden Lodge that's entirely within the London FIR and
that you do not intend to climb above cloud base. If any of these
assumptions are untrue you'll have to modify your NOTAMS request
Go to the National
Air Traffic Services Ltd web site. This is free but requires
You need to request a NOTAMS and then a UK Narrow
Route brief. To minimise the amount of irrelevant information
- a briefing ID. Accept the default.
- Select SNOWTAM, ASHTAM and BIRDTAM briefing
- the date and time of the flight. The time must be UTC
- EGSC (Cambridge) as your departure and an airfield
near the furthest point of the task as the destination.
- VFR traffic
- Validity period for the date you'll fly and times as 1000 -
- Narrow Route Width as the distance in NM from EGSC
to your farthest turn point and round it up a bit
- upper FL as the likely cloud base for the day, e.g.
050 for a 5,000 foot cloudbase
Leave all other boxes on their default values and click
Submit to generate a NOTAMS briefing. Scan through the
briefing. Mark any hazards on your map and you're ready to
declare your task to the Duty Instructor and go.
These suggested settings should give the required results but
check them carefully. I normally use SPINE (see below) and these
directions are adapted from the NATS site as it was when I last
used it in anger: it has been redesigned since then and not in a
way that helps glider pilots. I think the way I've suggested you
set the route width and destination should cover anywhere you're
likely to end up while you're on task. If GRL is not at one end
of the task, then set the departure and destination points to
either end of the task and adjust the width so that anywhere you
intend to go to either side of this line is covered.
NOTAMS via the SPINE graphical tool
Alternatively, you can use the SPINE desktop tool
to check NOTAMS. This application was written by Jeff Goodenough, who also wrote
TPSelect. SPINE lets you add your planned task to the on-screen
map which shows airfields, BGA turnpoints and plottable NOTAMS,
making it easy to set yourself a task avoiding restricted
airspace. SPINE reads NOTAM data directly from the AIS web site
and is capable of exporting it in either TNP or OpenAir so that
it can be displayed on task by suitable navigation programs, e.g.
LK8000, Winpilot or XCSoar.
Hazards near Cambridge
If there are NOTAMS for any of the following, check their
websites for launch schedules:
- CU Spaceflight launch
high altitude met balloons from a park just inside the west
edge of Cambridge.
- EARS launch high
power rockets near Ellsworth. We're barely 3 miles away from
their launch site.
Random Engineering launch high altitude met balloons from
the EARS launch site.
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