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Huge thanks to Kerry for helping make this happen!
This flight happened to be during “women in aviation week” 2016!
Tropospheric Ducting – details thanks to Kerry
and William Hepburn: Http://www.dxinfocentre.com
– caused by temperature & humidity inversions
– warm dry air over cool moist air
– 4 types
1. Nighttime Tropo – radiation inversion – most common, caused by radiational cooling @ night, burns off when sun rises
2. High Pressure Tropo – subsidence inversion – causes widespread conditions day or night, caused by sinking (subsiding) air aloft
3. Frontal Tropo – frontal inversion – ahead of warm fronts & behind cold fronts – usually brief
4. Marine Tropo (a.k.a. Lake Effect Tropo in Great Lakes region) – marine inversion – warm dry air advecting over cooler waters, most common in spring/early summer
Ducting will often cause false echoes on radar (a.k.a. “AP” or anomalous propagation).
Today’s ducting was “High Pressure Tropo”.
In a typical airmass, the temperature drops as you go up in altitude and the humidity increases. Sometimes, under strong high pressure, along a weather front, or over an ocean or lake, this condition is reversed. The temperature may increase with altitude; this is called a temperature inversion. If a temperature inversion is also accompanied by a corresponding humidity inversion, then we have the necessary conditions for anomalous propagation, or “A.P.”
On this chart (tephigram), we have cool moist air on surface, with milder and much drier air aloft, in this case 10% r.h. We can see the sharp boundary that separates the two airmasses just below 1500â€™ above ground. When VHF radio signals, that would normally head straight out into space, hit this boundary they get bent downwards and run parallel to the ground. This results in extended range and, along with that, the potential for increased interference.
This (tropospheric ducting forecast) map highlights the areas where there is a potential for A.P. to develop. In this case, propagation between Ontario and Iowa was possible.
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She’s a meteorologist, pilot and awesome photographer.
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