William Hepburn's
Worldwide

Tropospheric Ducting Forecast
6-Day Forecast of VHF, UHF & Microwave Radio & TV Anomalous Propagation & Interference
Low-Bandwidth Version


2019 William R. Hepburn
CLICK HERE FOR
Current Conditions

by Jon Harder / APRS
For personal use only. Please check here for usage restrictions.
Maps updated daily around 1800 UTC
Low
1
2
3
4
5
6
7
8
9
10+
NIL
MARGINAL
FAIR
MODERATE
HIGH
STRONG
VERY STRONG
INTENSE
VERY INTENSE
EXTREME
EXTREME
CLICK HERE FOR 42 HOUR FORECAST IN 6 HOUR INTERVALS

6 DAY PREVIEW
Click on map for more detail - Hit Refresh on your browser to ensure display of latest maps
Day 1 Day 2
Day 3 Day 4
Day 5 Day 6


42 HOUR FORECAST
1
2
3
4
5
6
7
8


EXTENDED  FORECAST
Day 3
Day 4
Day 5
Day 6
Low
1
2
3
4
5
6
7
8
9
10+
NIL
MARGINAL
FAIR
MODERATE
HIGH
STRONG
VERY STRONG
INTENSE
VERY INTENSE
EXTREME
EXTREME

PAST WEEK MAPS
Sunday
Monday Tuesday Wednesday Thursday Friday Saturday
Sunday
Monday Tuesday Wednesday Thursday Friday Saturday
Click for larger image



 The areas noted in the forecast have the necessary atmospheric conditions to produce tropospheric bending of VHF, UHF and/or  microwave radio waves. Tropospheric bending extends the range of radio & TV stations well beyond their normal limit and thus increases interference amongst stations as well.
 How to use the Tropospheric Ducting Forecast
 
Tropospheric DX Modes
 
History of the Tropospheric Ducting Forecast


 USAGE RESTRICTIONS IN EFFECT

The information on this website is primarily for personal use.
The re-posting of current forecast maps on other websites
, forums, Facebook, etc. is not permitted under any circumstance.

NON-COMMERCIAL USE
Reposting of current maps on websites, forums, Facebook, etc. is not permitted. Please provide a link instead. Broadcast of text or verbal information derived from using the maps, and display of old maps on websites, forums, Facebook and/or in publications for non-commercial purposes is permitted as long as William Hepburn is credited as the original source and a link to this website is provided. Terms for government use (including statutory corporations) are the same as for commercial use.

COMMERCIAL OR GOVERNMENT USE
Commercial or government use of any maps (forecast or archived) or the information they contain, whether for internal operational use or for use in the development of products or services, without obtaining licensed consent from the owner, is strictly prohibited.

To request a LICENCE, please contact the owner at dxinfo at cogeco.ca .



GrADS 2.0 (COLA/IGES) used to create maps.
GrADS copyright at http://cola.gmu.edu/grads/gadoc/COPYRIGHT.
Raw meteorological data source : Meteorological Service of Canada.
MSC licence at http://dd.weatheroffice.ec.gc.ca/doc/LICENCE_GENERAL.txt.

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Member of WTFDA Since 1977
Tropo Forecasts Since 2000
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