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Severe thunderstorms hitting NSW as oppressive heat continues

Source Weatherzone Wed 05 Feb 2025

Dangerous thunderstorms are developing across parts of NSW this Wednesday afternoon, with more expected to form as the state grapples with hot and muggy conditions. A severe thunderstorm warning for heavy rainfall, damaging winds and large hail has been issued for parts of the Blue Mountains, Hunter and Southern Tablelands as of 1pm on Wednesday. This included a warning for giant hail from a very dangerous thunderstorm that had developed over the Wollemi National Park. The image below shows that storms have already begun in the Hunter, western Sydney, the Illawarra coast and the Southern Tablelands and you can see the cloud on the satellite through the central ranges and coast associated with the southerly change. Image: Himawari-9 satellite images for the four hours leading up to 12:40pm AEDT on Wednesday, February 5 Severe thunderstorms may continue to form along southern and central ranges and adjacent slopes in NSW, the ACT and northeast Vic this afternoon and evening. As well as large-to-giant hail and damaging winds, heavy rainfall that could lead to flash flooding is a major concern on Wednesday. There are several reasons for this: High levels of humidity and precipitable water means that there is a lot of moisture in the atmosphere to be rained out. The winds in the middle levels of the atmosphere which steer thunderstorms are slow, meaning that these storms will move slowly potentially dumping lots of rain in one region. The severe thunderstorms on Wednesday are being generated by abundant heat and humidity and a southerly change moving up through parts of NSW.  Sydney sweated through an uncomfortable night with the temperature at 5am sitting at 23.3°C and the humidity making the temperature feel like 28°C. This set the scene for a warm and muggy morning, with the maximum temperature of 32°C recorded at 11am before the southerly change arrived. Meanwhile, western NSW and parts of the Hunter should see maximums in the mid 30s on Wednesday. As the day develops, please keep an eye out for the latest forecasts and warnings. - Weatherzone © Weatherzone 2025