IF you think the weather has been warmer and more humid than normal, then you might be right.
The Bureau of Meteorology (BoM) has confirmed that humidity levels have recently been above the March average in many parts of WA.
It is classified as humid when the dew point temperature is forecast above 15 or 16 degrees Celsius – which happened last weekend and early this week.
In Geraldton, the average monthly dew point temperature is 15.6oC.
From March 11, it began to exceed this, reaching 18.7oC on Friday.
For those further south, the average dew point for York in March is 12°C, but from March 12 it reached 15.5°C and 17.5°C on Sunday.
Fog also increased, including areas along the Great Northam Highway towards Northam.
BoM forecaster Jessica Lingard said this week had been wetter due to unusual trough activity.
“Usually our troughs sit vertically, so to speak, if you look at a map,” Ms Lingard said.
“They are on the west coast, but the tail of this trough has sat over the southwest of the state while the head of the trough, the northern end of it, has moved eastward. is as she normally would.”
Ms Lingard said this meant air circulated at the base of the trough where dry air came out of the land and picked up moisture from the ocean, before returning to land.
This is common along the Pilbara Coast, bringing fog and humidity.
With the higher humidity in the air, it’s no wonder there was also rain last weekend.
BoM recorded 22.6mm at Nyabing, while Jacup had 21.2mm, Mount Barnett 21mm and Ongerup had 19.6mm.
With continued afternoon monsoon thunderstorms in the Kimberley some places received over 10mm.
The falls in the southern half of WA were due to the passage of an upper trough, which Ms Lingard said encouraged the development of thunderstorms.
“The upper trough started further west of the state around Friday and just as that trough moved eastward it took the thunderstorms with it,” she said.
“The thunderstorms that moved through then Monday, Tuesday in the Eucla District and southern interior south – it’s still the same system that moved through the southwest.”
This weekend, a cold front is expected late Friday, early Saturday.
“The cold front could bring rainfall to the southwestern parts of the agricultural areas, then the coast and the south coast will also see a good drop,” Ms Lingard said.
“This time of year, fall, we have a few hot days with troughs along the west coast, then we have a few days of weak cold fronts.
“We’re switching between summer patterns and winter patterns, hopefully we’ll see a few more winter patterns and get some precipitation where it’s needed.”
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