WILDFIRE: LATEST LEARNINGS- v01.6

WILDFIRE: LATEST LEARNINGS

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General learning outcome:

SPECIFIC HIGH COUNTRY WEATHER:

Specific learning outcome:

Foehn winds are important in southeast Australia.

Topic:

The types of foehn winds and the conditions for their formation.

General Awareness for All Fireground Personnel


A prominent barrier ridge aligned across the prevailling wind flow can have a major impact on weather downwind through two processes, collectively called Foehn Winds. Firstly, it may block the low level air mass, with upper level air flowing down on the lee side. Secondly it may raise low level air (in passing over the ridge), causing the air to lose moisture through precipitation. When it descends it is warmer and drier than it was upwind of the ridge. Additionally the downward descent may accelerate the air flow.


Thermodynamic foehn wind process.


Mechanical foehn wind process.
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This website is dedicated to bringing forward the latest research findings. They are provided to allow firefighters to be made aware of critical safety issues ahead of the material being included in the national training curriculum.
Material prepared by Rick McRae for AFAC Research Dissemination Pilot Study, March 2012.