The Wind Change at the Ridge Road Interface
It is 14:20 on a Total Fire Ban day with a Severe fire danger rating. You are the crew leader of a 4WD light tanker with 600 L of water, tasked to a rural-residential estate of 40 properties strung along Ridge Road. The fire is 6 km to the west and wind is forecast to swing from NW to SW between 15:00 and 16:00, which would push the flank onto the estate. A resident at number 12 refuses to leave, saying she must stay for her horses. Two of your crew are 19-year-old recruits on their first season. Radio reception is patchy. Your sector commander asks for your assessment within 10 minutes.
1. What is your primary recommendation to the sector commander, and what reasoning drives it?
Read the worked answer
Recommend withdrawal of the tanker to a safe anchor point before the wind change, unless the sector commander can guarantee a cleared escape route and a defendable structure plan for the estate.
Reasoning chain:
- Wind change is the danger, not the fire front. A NW-to-SW swing turns a flank into a head fire and can widen the fire edge dramatically; crews caught in a change on a road with one access point are the classic fatality scenario.
- 600 L is roughly 2-3 minutes of effective firefighting. That is not enough to defend 40 properties or to recover from being overrun.
- Crew capability: two first-season recruits need direct supervision; you cannot split the crew to both defend and evacuate.
- Escape: a single road with 40 properties and a resident refusing to leave is a trap. Confirm with the sector commander whether Ridge Road is still a viable exit and whether the refusing resident has been logged for police welfare follow-up.
- Do not commit to structure defence on a flank that the wind change will hit. Advise the commander of the trigger point (e.g. smoke column leaning toward you, wind shift felt, ember shower) at which you leave regardless.
2. How do you handle the resident at number 12?
Read the worked answer
- Do not physically remove her. Firefighters do not have authority to forcibly evacuate in WA; that is a police matter.
- Record and report: log her address, name, and refusal, and pass it to the sector commander so police can attend for a welfare/evacuation check.
- Give her a clear, honest warning: the wind change will bring the fire onto the estate, and if she stays she must be inside a cleared, non-combustible area with water and wool/leather clothing, and she must not expect firefighters to rescue her.
- Practical advice: release horses to a large cleared paddock with water, do not tether them in a stable, and shut gates so they are not on the road when the tanker needs to move.
- Do not spend crew time on her animals while the estate is under threat; your duty of care is to your crew first.
3. What trigger points would you set for leaving, and why?
Read the worked answer
Set observable, unambiguous triggers rather than clock times, because fire behaviour outruns forecasts:
- Wind shift felt or observed (smoke column changes lean, flags change direction) - leave immediately; the change is the event.
- Ember shower or spot fires within 500 m - the fire is already ahead of you.
- Smoke obscuring Ridge Road - the escape route is compromised; leave before it closes.
- Any crew member showing heat stress or confusion - capability is degraded.
- A hard time trigger (e.g. 15:00) as a backstop if the forecast holds.
Leaving early is the decision that keeps the crew alive; defending a structure is only justified when the structure is defendable, the crew is trained and rested, and there are two ways out.