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The cool wet season has arrived

After a record dry spell and the continuing drought, finally some rain arrived into areas around the Hauraki Gulf on early Monday 13th April. With a lack of ex-tropical weather systems again this summer, the weather pattern change could not have come soon enough for those who desperately need the water for storage, stock, produce and the gardens.

The cool wet season is triggered each year around April by a surging polar jet stream, which allows cold upper air to interact with sub-tropical moisture and the warm sea surface water. Cold and warm frontal boundaries then help trigger initial rain bands followed by days of unstable south westerlies. Generally the warmer dry season starts at the commencement of November.

Here were the 24 hour local rainfall totals up until 7pm, 13th April.

Hunua 23mm Riverhead 22mm Rothesay Bay 22mm Paremoremo 22mm Birkenhead 21mm Chatswood 20mm Greenhithe 19mm Torbay 18mm Long Bay 18mm Waimauku 18mm Browns Bay 18mm St Heliers 18mm Whitianga 18mm Mission Bay 17mm Stanley Point 16mm Helensville 15mm Wharekawa 15mm Herne Bay 14mm Murrays Bay 14mm Hobsonville 13mm Bayswater 13mm Waiheke Is 13mm Grey Lynn 13mm Great Barrier Is 13mm Narrow Neck 13mm Onehunga 13mm Thames 12mm Castor Bay 12mm Ellerslie 12mm Hauraki 12mm Milford 12mm Takapuna 12mm Devonport 12mm Henderson 11mm Red Beach 11mm Howick 11mm Redvale 10mm Albany 10mm Campbells bay 10mm Pukekohe 10mm Warkworth 10mm Auckland city 9mm Stanmore Bay 9mm Beach Haven 9mm Bucklands beach 9mm Wellsford 9mm Whangaparaoa 9mm Beachlands 8mm Orewa 8mm Omaha 7mm Northcote Point 6mm Whangarei Heads 6mm Kawau Island 6mm Matakana 6mm Waipu 6mm Whangarei 6mm Coromandel 5mm Marsden Cove 5mm Glenfield 5mm Leigh 5mm Mangawhai 3mm

Sources: Online private weather stations. #Note with heavy downpours, some localised large differences can occur between close gauges.

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