A total fire ban has been declared for the entire state of Victoria for tomorrow.

Conditions are expected to be most dangerous in the Wimmera where Victoria’s first code red catastrophic day has been declared.  The Country Fire Authority says all national state parks and forests in the district will be closed, in the interest of public safety. The CFA says fire danger is considered extreme in the Mallee, North Central, Western and Central districts including Melbourne.  The organisation is advising people in high risk areas across the state to activate their bushfire plans.

Temperatures are expected to top 40 degrees across much of the state.

In the Wimmera region, holidaymaker and residents are being urged to leave as the area braces for the first catastrophic fire danger day in Victoria since Black Saturday.  The warning came as a volunteer firefighter lost his life and four others were injured this morning when their truck rolled over on the way to do further blackouts after last week's Lake Mokoan fire.

While the Bureau of Meteorology will later today make the official announcement on fire danger ratings, fire authorities said it was important to get people moving out of danger zones as soon as possible.

The Wimmera fire danger rating is currently at extreme and conditions are expected to worsen.  "This is about protecting lives and taking action,"Country Fire Authority chief officer Russell Rees said.  "We want everyone to understand that you do not wait around for a fire and then get on the road. Being on the road during a fire is the most dangerous place to be."  He said people in the Wimmera should activate their fire plans and those choosing to leave should leave as soon as today.  "We're making this announcement and providing this information because we want the community to act now."

Rangers are today advising campers and other holidaymakers in state parks and forests in the Wimmera to leave the area and go to cool and safe places nearby, said Department of Sustainability and Environment chief fire officer Ewan Waller.

Mr Waller warned all Victorians not to go bushwalking or travelling in the bush tomorrow and campers to extinguish their fires immediately.  Mr Rees said that on Tuesday, it was highly likely that north-eastern Victoria would also reach Code Red conditions.

And the rating for Melbourne and outer metropolitan regions, from Geelong to the Mornington Peninsula, is expected to reach extreme on Tuesday.

Victoria Police Chief Commissioner Simon Overland said deaths could be expected as a result of the extreme weather events, and the elderly and very young should stay out of the heat and drink plenty of fluids.  He said all government agencies stood ready to deal with the catastrophic conditions but they needed people too co-operate too.  "Personal responsibility has to be the key part of the process. People need to be thinking about what they need to be doing and keep themselves and their loved ones safe," he said.

The warning came hours after Hugh Monroe, a 61-year-old CFA volunteer from Tolmie died and four others were injured when the fire tanker they were travelling in rolled near Tatong in northern Victoria.  The CFA crew had been called to a fire on Spring Creek Road and rolled near the Tatong Tolmie Road.  Police and paramedics were called to the scene about 6.30am, after one or two of the injured made their way to a nearby house to raise the alarm.  A local doctor and an off duty police officer were among the first on the scene, Ambulance Victoria spokesman John Mullen said.  When paramedics arrived, they found the deceased driver trapped in the tanker.

A 42-year-old man was flown to Royal Melbourne Hospital with spinal and chest injuries and a 52-year-old man with neck, back and head injuries was flown to The Alfred.  An injured man and woman were driven to Goulburn Valley Hospital in Shepparton.  The police, coroner and the CFA are investigating the incident.  Mr Rees and Acting Premier Rob Hulls extended their condolences to the family of the deceased man and said this was a time to reflect on sacrifices given by volunteers to protect the community.

With AAP - The Age- Selma Milovanovic and Kate Lahey