Friday, 5 December 2025

The cold supermoon will appear in the night sky tonight. Here's how to spot it.

 Extract from ABC News

Behind the Lines political cartooning exhibition opens in Canberra, awarding Matt Golding the top prize.

Extract from ABC News

New York Times sues the Pentagon over press access restrictions.

 Extract from ABC News

Indigenous Tribe NYT Lawsuit

The New York Times is suing the Pentagon. (AP: Mark Lennihan)

In short:

The New York Times has failed a lawsuit against the US Department of Defense in an effort to force the Pentagon to abandon a restrictive new press policy.

The policy requires journalists to sign a pledge to refrain from reporting information not authorised for release by the Pentagon.

The Times alleged the policy violates the rights to free speech and due process.

Today in History, December 5: How Prohibition was brought down by gangsters, bootleggers and violence.

Extract from ABC News

Heatwave stretches from Kimberley to Sydney as hot summer arrives.

Extract from ABC News

A hot northwesterly airstream will send temperatures above 40C in a band from the northwest to eastern NSW during Friday and Saturday.

Wave of heat travelling coast to coast

A broad mass of hot air started the week along the west coast, bringing Perth's hottest start to summer on record with a Monday high of 39C.

By Thursday, a north-westerly airstream had carried the wave of heat to south-east states — Adelaide and Melbourne both reached 35C, their warmest days since March.

While cooler onshore winds have now brought relief to Australia's southern coastline, the north-westerlies will continue to increase temperatures across the interior and NSW on Friday.

Maximums will reach the low to mid 40s in a broad swathe of the outback from the Pilbara and Kimberley to western NSW, including predicted tops of 45C in Fitzroy Crossing, 44C at Oodnadatta and 42C in Ivanhoe.

The sun rising on the horizon

The sun rises over Lake Macquarie where Thursday reached 33C and highs of 37C and 39C should follow Friday and Saturday. (Supplied: Beth Bunn)

However, the highest temperatures relative to average will impact eastern NSW, including highs near 40C in Western Sydney.

For Sydney suburbs closer to the coast, the ever-reliable divergence to a cooler north-easterly off the Tasman Sea should limit highs to the mid-30s.

The highest fire dangers on Friday at 'extreme' will impact the Riverina and Mallee, where temperatures from 38C to 41C will combine with winds to 45 kilometres an hour and humidity down around 10 per cent.

Severe heatwave for NSW coast to peak Saturday

The belt of fresh winds will shift north on Saturday and result in temperatures peaking over northern and eastern NSW, with an extreme fire danger from the state's north-west through parts of the central inland to the Hunter, Sydney and Illawarra/Shoalhaven.

For Sydney, the region of 40C heat will expand to within about 20 kilometres of the coast, while outer western suburbs peak at 41C, as much as 12C above average.

Penrith may record its first pair of successive 40C days since 2023, while the city could record two consecutive days above 35C for the first time in five years.

Away from Sydney, much of the Hunter, Illawarra and Central West will also nudge 40C on Saturday, while the state's north-west bakes in tops up to 43C in Bourke and Brewarrina.

However, while the outback sweats through the highest temperatures, a heatwave warning is only in force near the coast.

A map of new south wales showing heat predictions.

A severe heatwave warning is current from the Hunter to the South Coast and Snowy Mountains, including Sydney.

The BOM has assigned a 'severe' rating to the heatwave from the Hunter to South Coast, which indicates challenging conditions for vulnerable people if precautions are not taken to keep cool.

So why is the heatwave considered more intense near the coast?

The BOM uses what's called the excess heat factor (EHF) to monitor and forecast heatwaves, which includes a comparison of the temperatures for a three-day period with a region's normal climate, and also the observed temperatures over the past 30 days.

In simple terms, according to the BOM, "the EHF measures how much of a shock to the body the forecast temperatures will be, compared to the weather over the past month".

This method ensures a hot city like Darwin is not warned of a heatwave every day, and a cooler city like Hobart is warned during spells of relatively high temperatures, even though they may seem cool by mainland standards.

The calculation for a heatwave is also based off the minimum temperature and the maximum, since cooler nights allow some recovery from each day's heat.

Around Sydney, Saturday minimums will range from about 20 to 23C, up to 5C above average, while Saturday night could remain above 30C until near midnight.

Southerly buster ahead for NSW, but summer tipped for a scorcher

As with most heatwaves over southern Australia, cool relief will arrive quickly and Sydney can expect a 24-hour temperature drop close to 15C.