I have been studying & experimenting for several years with regard to possible weather effects on radio propagation and in particular skywave propagation. In the course of my research I found that high pressure over areas and especially as this high pressure was moving into a particular area was causing skywave propagation enhancement from that area. This propagation effect was shown to be as a result of rising pressure in that area, hence the use of pressure tendency charts here. Research was carried out using aero and marine navigational Non Directional Beacons in the frequency region of 280 to 500 kHz. Suitable pressure tendency charts may be produced by ownloading synoptic data and using Digital Atomsphere software to generate the chart for your region. The purpose of these charts is for Radio Amateur and SWLs to be able to either predict, using the simple instructions below, areas where likly radio propagation enhancement may occur on a nightly basis or to study the reception results from a previous night by comparing them with the appropiate charts.Example charts are available using the links below. Please note that these are just example charts.
Although I used to produce charts for the USA and Europe at the weekends due to my workload this is no longer possible. However I can produce charts for Europe and USA and times (0600, 1200, 1800 or 2400 UTC) by e-mailing me and including the requested date, region and required chart time and requests will be actioned as soon as possible.
Basic instructions for using as a weather based propagation forecast tool.
These charts are based on pressure tendency. Areas of risng and falling pressure are shown using contours. In order to predict geographical areas of weather based propagation enhancement we need to look for the leading edge of rising pressure areas. The area of prime enhancement is the leading edge and this is usually the eastern edge in the northern hemisphere but not always so you may have to compare charts over a couple of days to guage a pattern.
It is possible the prime area of enhancement may have moved a little so a little bit of guess work may be required to estimate the current actual position. Often there may be several areas of rising on the chart. The area that you may receive weather based propagation enhancement from will depend if there are other higher pressure rises between your location and the target area. Think of the rising pressure areas as mountains and the falling pressure areas as valleys. If there is a higher "mountain" between you and another area you will not receive that other area. However it the reverse is the case then you may possibly receive from the more distant area.
The charts can also be used to compare a previous night's reception by comparing the chart for the evening before your reception period. For example if you were listening between 2300 Friday and 0100 Saturday use the Saturday 2400 UTC pressue tendency chart.
Please note that this forecast propagation chart service now only operates on request.
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