Cumulonimbus flammagenitus (pyrocumulonimbus) building over north east VIC, as the Walwa fire temperature increases.

Aussie weather in 2025.

Tropical Cyclone Hayley crossing the Dampier Peninsula, just south of Lombadina/Djarindjin.

The weather in 2025.

Tropical low over north west QLD.

Almost cloudless skies over VIC. Marvellous day for cricket.

Period of negative AAO/SAM caused by sinking/warm air over Antarctica during spring slowly coming to an end. The pattern is behind the dominance of westerly winds and associated weather over southern Australia in recent months.

Cloudy Christmas Day ahead for eastern NSW, after a sparkling Christmas Eve.

Christmas Day temperature forecast for Australia. 🎄

Dank, coastal air fighting its way under crystal clear westerlies over the Southern Highlands of NSW. There'll be to and fro, but the easterly will win during Christmas Eve.

Sydney Observatory Hill enduring its warmest day since January 2020.

Projections for Christmas Day across Australia from ECMWF and NOAA's AI models, and their dynamic counterparts. White Christmas possible for far southern parts.

North easterly breeze stabilising skies over the Sydney Basin.

Central NSW bushfires. The fire near Bogee, south east of Mudgee, is currently at emergency level. There's a chance of worthwhile rain over these areas during the next few days.

The eruption of Hunga Tonga-Hunga Ha'apai in January 2022 - among the most remarkable observations of the satellite era.

Cold giving way to heat over south east Australia, as a high pressure system moves over the Tasman Sea.

Cool and windy start to summer across south east Australia.

Kati Thanda-Lake Eyre turning pink, as water evaporates, salinity increases and microorganisms make hay (or carotenoids).

Summer begins with negative AAO/SAM continuing (warmth/high pressure over Antarctica pushing sub-Antarctic westerlies further north than usual). The bushfire risk across parts of eastern Australia increases with every burst of westerlies.

Low sun angle highlighting dust blowing over the Tasman Sea on Wednesday evening - the result of strong winds and gusty thunderstorms further west.

Antarctic sea ice bobbing around south of WA. In October, there was a touch more of it than usual at these longitudes, but sea ice extent on the whole is low. climate.copernicus.eu/sea-ice-cove...

Widespread thunderstorms over central and eastern Australia on Tuesday afternoon.

In satellite imagery, Severe Tropical Cyclone Fina's eye feature has tended to be obscured by cirrus. It's a bit more apparent on Monday morning, as the system approaches the northeast Kimberley coast.

Tropical Cyclone Fina's journey across the Cobourg Peninsula, over Melville Island and Van Diemen Gulf, past Darwin, and south west towards Joseph Bonaparte Gulf.

Latest projections from BOM ACCESS-C and ECMWF HRES for Severe Tropical #CycloneFina. Both already a little off the mark; ACCESS closer. Official forecast track at www.bom.gov.au/warning/trop....

Severe Tropical #CycloneFina - now category 3 - over Van Diemen Gulf, north east of Darwin. www.bom.gov.au/warning/trop...

Tropical Cyclone Fina approaching the Top End's Cobourg Peninsula.

Tropical Cyclone Fina doing some rebuilding on Thursday. Consolidation is expected on Friday, with a return to category 2 intensity.

Tropical Cyclone Fina's cirrus shield concealing a well-defined eye feature.

Comparison between projections from ECMWF HRES and BOM ACCESS-G for Tropical #CycloneFina. Official forecast track at www.bom.gov.au/warning/trop....

Convection associated with Tropical #CycloneFina. The system may be over Van Diemen Gulf, north east of Darwin, by Saturday. www.bom.gov.au/warning/trop...

Tropical Cyclone Fina - the Australian region's first of the season - north of the Top End. www.bom.gov.au/warning/trop...

The fingerprint of negative AAO/SAM - sub-Antarctic westerlies pushed northward. Differing alignment of planetary waves has brought slightly cooler air masses to southern Australia during the first half of November, compared with October.

Himawari's high temporal resolution "target" area monitoring the tropical low developing over the Timor Sea.

Cold front ploughing across TAS on Thursday.

November top-up for the Snowy Mountains. link.dataspace.copernicus.eu/lqip

An incursion of dry, polar air brought widespread frost and a swag of November record low temperatures across south east Australia on Wednesday morning. Records for stations with 15+ years of history are highlighted.

This cold front, and tonight's late-season frost under the dry air behind it, are the latest effects of ongoing negative AAO/SAM on south east Australia.

Another burst of strong westerlies (then shallow coastal southerlies) across eastern NSW on Tuesday, before dry and rapidly stabilising air brings late-season frost to the ranges and slopes.

Dry, stable air in the wake of a cold front will produce late-season frost across prone parts of south east Australia on Wednesday morning.

Typhoon Fung-wong / Uwan near the Philippine coastline.

Tropical Storm Fung-Wong building over the Philippine Sea. The system is expected to intensify and cross northern parts of the Philippines early next week.

Low pressure system over Central West WA on Wednesday.

Cross section of the 2025 southern polar vortex in the middle stratosphere. Disturbances propagating up from the troposphere since September have caused this year's vortex to dissipate more quickly than usual.

Multi-centred low pressure system bringing fresh westerly winds and wintry showers across south east Australia.

Thunderstorms ahead of and behind the cold front crossing south east Australia, and along the trough extending to its north.

Polar and tropical air masses interacting over south east Australia.

Severe thunderstorms affecting parts of eastern NSW on Friday evening.

A shortwave rippling across eastern Australia will combine with a surface trough to produce showers and thunderstorms on Friday and Saturday.

Eastern Australia has gone from dry, stable westerlies in mid-October to something a little more showery for the start of November. Here's how the broad-scale pattern has evolved. Note that negative AAO/SAM (reds over Antarctica) hasn't quite dissipated yet.