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High humidity and warm nights in Sydney
Tristan Meyers, Wednesday February 25, 2015 - 12:38 AEDT
The last seventeen nights have been sticky and humid for Sydney, with temperatures struggling to dip below 20 degrees since the 9th February.
In this time, Sydney-siders have sweated through the nights, where the average minimum temperature has been over 2.5 degrees warmer than the February average. In fact, this is the longest stretch above 20 degrees since 2010.
The most dominant synoptic feature this time period was a high pressure ridge extending along the east of NSW. This system directed moist winds onshore, causing isolated showers along the coasts. Sea surface temperatures off the southeast of Australia have also been warmer than average, adding to the amount of moisture in these winds. This easterly-component flow fed more and more moisture inland, creating high levels of humidity. This humidity was most noticeable during the night, where heat was "trapped" by the extra moisture in the air.
Aside from pausing your fan's rotation so the air hits nothing but your face while you sleep, residents of Sydney should hope for a strong southerly change. These are famous for drying out the Sydney Basin and cooling down the city. Although a brief change came through yesterday bringing some slight relief, a proper gusty southerly is looking to move up the east coast of NSW around next Sunday evening.
- Weatherzone
© Weatherzone
2015
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