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Wet season in the north: rostering when roads and flights close
Wet season rostering for northern remote sites is about deciding in advance what happens when travel fails, because in the wet it will. Roads go under, airstrips close and charters get cancelled on the morning, so a crew change that looked settled a week ago can fall apart in an afternoon. Nobody can roster the weather away, but you can agree the rules with clients before the rain, spread critical tickets across more people and make sure the office always knows who is where and who needs to hear what.
What the rainfall onset outlook says
The Bureau of Meteorology's northern rainfall onset outlook is a useful early signal for planning. The Bureau defines the onset as the date when at least 50 mm of rain has accumulated since 1 September. Parts of coastal Queensland and the western Top End typically reach it by late October or early November, while southern inland parts of the Northern Territory and Queensland, and western parts of Western Australia, usually get there around mid-January.
As at September 2026, the final outlook for the season, issued on 27 August 2026, gives northern and eastern Queensland and the Top End a 55 to 80 per cent chance of a later than normal onset, and the Pilbara and Gascoyne coastline a 55 to 75 per cent chance. An earlier than normal onset is favoured across the rest of Western Australia, western and central parts of the Northern Territory, and western and central Queensland.
Read it for what it is. The Bureau says the outlook gives a chance of an early or late onset, not how much rain the season will bring, and that the monsoon is a different measure, usually reaching Darwin in the last week of December. A later onset doesn't promise an easy wet. What it can help with is timing the conversations below.
Agree the rules with the client before the wet
The worst time to work out who pays for an extra week of camp is while the crew is sitting in it. Before the season, agree with each northern client what happens in the two situations you know are coming: the outgoing crew can't leave, or the incoming crew can't get in.
Cover whether stuck crew keep working or stand down, who pays for their accommodation and meals, whether a swing that runs long gets shortened next time, and who makes the call when a charter is cancelled. Put the answers in writing. Any extended stay also has to fit the site's fatigue management plan. Pay for stood-down or extended time is a question for your award, your agreements and your adviser, not your rosterer on a wet Tuesday.
Build the buffer into the crew
A buffer in the wet is mostly people. If the only person on the incoming crew who holds the ticket the site needs is on the charter that got cancelled, the site is short that ticket until the next way in. Spread the critical competencies across more than one person on each crew, and across both rotations where you can.
It also helps to know early in the season who could go in at short notice from somewhere closer, and who on the current crew would stay on if relief can't arrive. Workers in Mustr drag out their own availability on their phone, and the shift editor shows each person's verified competencies and the exact dates they're free, including partial fits. Anyone locked into another site that week is greyed out with the clashing site and dates, which saves ringing people who can't go anyway.
Keep the travel on the shift when it keeps changing
In a dry month a flight gets booked once. In the wet, the same crew change might be rebooked several times, pushed back a day, or switched from a charter to a road trip and back again. Every rebooking is another chance for the roster and the travel to stop matching. Keep flights and accommodation on the shift itself and update them there every time they move, so the office and the client are looking at the same thing. In Mustr the client site can tick off flights and accommodation on the shift too, which matters when the client books the camp and your office books the seats. The basics are in tracking flights and accommodation for FIFO crews.
Tell the crew fast, and tell them once
When a road closes or a charter is cancelled, the crew needs to know before they drive to the airstrip or pack up their room, and they need one clear version rather than different stories from the site, the office and a mate on the other crew. When a shift's dates change in Mustr, the crew on it are told and the client sees the previous details next to the new. The "let the people affected know" tick on the shift form is on by default, so the update doesn't rely on someone remembering to send it.
Push notifications need setting up per device, and on iPhone and iPad Mustr has to be added to the home screen first. Do that with the crew before the wet, not during it. And don't assume a message landed. Coverage in the north is patchy, so for a cancelled charter a phone call to confirm is still worth the minute it takes.
When the roads open again, go back over the swings that ran long and the crew changes that failed. Write down the ticket that was never held by two people while it's fresh, and fix it before the next wet.
Questions people ask
When does the wet season start in northern Australia?
The Bureau of Meteorology tracks the northern rainfall onset, the date when at least 50 mm of rain has fallen since 1 September. Parts of coastal Queensland and the western Top End typically reach it by late October or early November, and southern inland parts of the Northern Territory and Queensland and western Western Australia around mid-January. The monsoon is measured separately and usually reaches Darwin in the last week of December.
Is the wet season onset expected to be late?
As at September 2026, the Bureau's final onset outlook for the season, issued 27 August 2026, favoured a later than normal onset for northern and eastern Queensland, the Top End and the Pilbara and Gascoyne coastline. An earlier than normal onset was favoured across the rest of Western Australia, western and central parts of the Northern Territory, and western and central Queensland. The outlook is a probability, and it says nothing about how much rain the season will bring.
What happens to FIFO crews when flights are cancelled in the wet?
That depends on what you agreed with the client before the season. The outgoing crew either keeps working or stands down on site until there's a way out, and the incoming crew waits for the next one. Any extension has to fit the site's fatigue management plan, and pay for the extra time is a question for your award, agreements and adviser.
How do you roster a remote site through the wet?
Agree the rules for stuck and delayed crews with each client before the rain starts. Spread critical tickets across more than one person on each crew so a missed charter doesn't take a task off site. Keep travel on the shift, and tell the affected crew as soon as anything changes.
If you run crews into the north, see how it works for remote mine site rosters or book a demo and walk through a swing that changes twice.