Weather Glossary - Z
Large-scale atmospheric flow in which the east-west component (i.e., latitudinal) is dominant. The accompanying meridional (north-south) component often is weaker than normal. Compare with meridional flow. Weather systems tend to move past quickly in a zonal flow regime.
Greenwich Mean Time (GMT). Centred on zero degrees longitude. For scientific purposes this time zone is also known as Universal Time (UTC). All meteorological observations worldwide are reported using this time (for ease of comparison and computation). This timezone is commonly suffixed with 'Z'.
With a few days to go until the official end to the summer season, it looks like parts of New South Wales could still see the odd drop of rain.
A weak cold front will clip the southern parts of South Australia today and reach Victoria in the afternoon.
Heavy rainfall that caused flooding across southern Western Australia a week ago has filled Perth's river systems with sediment and nutrients, as well as potentially harmful bacteria.