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Foggy Sunday morning for NSW

Drew Casper-Richardson, Sunday July 17, 2016 - 11:52 AEST

Parts of central and southern New South Wales have awoken to a foggy Sunday morning.

A broad high pressure system brought ideal fog conditions overnight on Saturday and into Sunday morning. Fog needs a couple of key ingredients to form: moisture and light winds. The high directed an onshore breeze over eastern parts of New South Wales, bringing an increase in atmospheric moisture as well as the required light winds. As the airmass cooled overnight it reached its saturation point and water droplets developed to form fog.

Murrurundi Gap in the Upper Hunter recorded some of the thickest fog with visibility dropping below 50 metres. Elsewhere around the state Armidale dropped to 500 metres, Moss Vale 300 metres, Mt Boyce 150 metres and Williamtown 100 metres. The nation's capital didn't escape either with visibility down to 150 metres.

Freezing temperatures combined with the fog to produce freezing fog in some of the elevated areas in southern New South Wales. Bombala and Cooma both dropped to minus four degrees this morning with visibility in fog dropping to 200 metres and 150 metres respectively, making for a truly wintry start to the day.

In Sydney fog wasn't as thick but combined with some early morning drizzle to drop visibility.

Overall the fog has lingered a little longer than normal leading to the slow rise in temperatures. The fog will burn off during the late morning and early afternoon with a mild mid-winter day ahead for much of the state.

- Weatherzone

© Weatherzone 2016

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