The GFS model has some instability increasing offshore tonight. This means there is a risk of storms developing particular near the coast but mainly offshore.
Today and particularly this afternoon has seen some sultry conditions across eastern NSW with high dew points for mid March. An upper trough is expected to over ride the region this evening and tonight. Depending on the wind change, this could be the focus for the development of showers and thunderstorms.
Here is the forecast sounding for this evening right on Sydney! Instability increases during the evening with upper level cooling as the upper trough takes effect.
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