N.I. Heavy Rainfall Event - Jan 27-Feb 02

[David]

Much nicer than I expected today after the morning showers cleared. Really humid though with dewpoint 21-22C.

[spwill]

Towering Cu and small Cbs visible in the west with the convergence out there, a partly cloudy dry afternoon this side of town. Feels tropical today with the dew point up to 22C.

[jamie]

I’m at the southern end of lake Taupo on holiday. 204mm so far since it started and it is still pouring. Never seen rain like it.


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[Nev]

Mod Note: Have extended the date of this thread to include round 2 from this system in coming days.

[Nev]

Here's a few more notable N.I. 36 hour rainfalls from MS to midday today...

https://twitter.com/MetService/status/1 ... eHsfgsAAAA

Also a 24 hr Akld radar rainfall accumulation to 8am this morning...

Metservice 24 hour rainfall accum. to 8am Jan 28.jpg

[harveyt86]

Certainly one for the books. By a long shot as well. Feeling thankful we missed the worst of it at home.

Made it down to Eastern BOP today. Roads and weather okay but rivers and steams were certainly flowing. Be interesting to see what rest of the weekend and first half of the week bring here..

[RODALCO]

A couple of stills taken of a video I made last during Community Patrol. We assisted various people with cars stuck in flash flooded areas. The downpour was very heavy from 1800h till around 2130 hours in The New Lynn, Kelston, Glen Eden, Titirangi area.

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[James]

I wonder when someone will finally link the past year's strange weather with that pesky volcanic eruption last January, as I suggested back in August.

[jamie]

Up to 225mm now at the bottom of lake Taupo. Starting to see slips now. Relentless rain. No end in sight.


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[harveyt86]

Up to 225mm now at the bottom of lake Taupo. Starting to see slips now. Relentless rain. No end in sight.


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Was the lake still high prior to this or had it dropped some over the last month or so? This will certainly top it back up..

[jamie]

It had dropped back to normal levels but the rise in lake level over the past couple days has been notable.


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[David]

Hearing distant rumbling in the gulf

[David]

Lightning observed too

[Nev]

Yeah, heaps of lightning out this way from an incoming rainband. Became active fairly quickly too.

Edit. Heavy rain here now.

[jamie]

Back to torrential rain here too after a reprieve


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[Tornado Tim]

Convection is ramping up again with large amounts of water vapour, this is going to be interesting.

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Severe T-Storm Warning issued with Watches in Auckland and Waikato overnight:

image.png

Severe Thunderstorm Warning

Area: Gulf, Waikato, Hauraki, Matamata Piako, Franklin

Forecast: These severe thunderstorms are moving towards the south, and are expected to lie near KAIAUA, MARAMARUA, FIRTH OF THAMES, MIRANDA and THE HUNUA RANGES at 12:45 am and near HUNTLY, MARAMARUA, TE KAUWHATA, OHINEWAI, WAITERIMU, WAERENGA and TANIWHA at 01:15 am.

These thunderstorms are expected to be accompanied by torrential rain.

Torrential rain can cause surface and/or flash flooding about streams, gullies and urban areas, and make driving conditions extremely hazardous.

A Severe Thunderstorm Watch remains in force for AUCKLAND, GREAT BARRIER ISLAND, COROMANDEL PENINSULA, BAY OF PLENTY and WAIKATO.

thunderstormWarningImage.png

Severe Thunderstorm Watch

Area: Auckland, Great Barrier Island, Coromandel Peninsula, Bay of Plenty, Rotorua, Taupo

Period: 9hrs 30min from 11:30pm Sat, 28 Jan - 9am Sun, 29 Jan

Forecast: Updated 11:15pm to include Auckland and Great Barrier Island

There is a possibility of thunderstorms about Auckland including Great Barrier Island, Coromandel Peninsula, Bay of Plenty and Taupo overnight Saturday and during Sunday. Until about 9am Sunday morning, some of these thunderstorms may become SEVERE, producing localised downpours with intensities of 25 to 40 mm per hour.

Rainfall of this intensity can cause surface and/or flash flooding, especially about low-lying areas such as streams, rivers or narrow valleys, and may also lead to slips.

Driving conditions will also be hazardous with surface flooding and poor visibility in heavy rain.

Issued: 11:21pm Sat, 28 Jan
Next update: 9am Sun, 29 Jan

Area: Waikato, Waitomo, Taumarunui

Period: 7hrs from 2am - 9am Sun, 29 Jan

Forecast: There is a possibility of thunderstorms developing again about Waikato, Waitomo and Taumarunui overnight Saturday and Sunday morning. From about 2am till 9am Sunday morning, some of these thunderstorms may become SEVERE, producing localised downpours with intensities of 25 to 40 mm per hour.

Rainfall of this intensity can cause surface and/or flash flooding, especially about low-lying areas such as streams, rivers or narrow valleys, and may also lead to slips.

Driving conditions will also be hazardous with surface flooding and poor visibility in heavy rain.

[David]

Picked up a quick 10mm here just after midnight but the thunder stayed east of here.

[spwill]

Should see a clearing up process in our weather by Thursday however the system coming in later Tuesday could be very significant with more flash flooding.

[David]

Metservice has a new orange warning out for Auckland:

Heavy Rain Warning - Orange

Period: 15hrs from 4pm Sun, 29 Jan - 7am Mon, 30 Jan
Area: Auckland including Great Barrier Island

Forecast: Expect 50 to 90 mm of rain north of the City, but possibly 150 mm in localised places. Lesser amounts are likely about and south of the City but amounts may still exceed warning criteria in some places. Peak rates of 10 to 20 mm/h, but localised areas may see downpours of 25 to 40 mm/h, especially in the north. Thunderstorms are also possible.

Impact: Heavy rain may cause streams and rivers to rise rapidly. Surface flooding and slips are also possible and driving conditions may be hazardous.

Issued: 4:44pm Sun 29 Jan
Next update: 9:00pm Sun 29 Jan

[Nev]

More thunder out in the Gulf atm...

[David]

More thunder out in the Gulf atm...

Just hearing that here now. Looks intense on radar!

[Cherie]

Apologies if this has been asked, I haven’t read every post but I was stunned to read in the paper today that MetService didn’t declare a red rain warning for Auckland till 9.30pm Friday night. That seems awfully late. I knew about the orange warning, but it rains heavy all the time here and I was trying to get some deep work done before knock off so wasn’t even thinking about it (or checking media, socials etc) before I finished work at 7pm Friday. It was not good then, like a monsoon outside and streets/footpaths like rivers as I walked to Britomart only to find no trains, and buses not running properly and generally a lot of chaos with little information. I guess it just seems like no one official wanted to “call it” and I wondered if an earlier “red warning” would’ve been the first thing that helped. My work would’ve let us go home early. Can’t believe I’m saying this, but one of those emergency text alerts would’ve been nice!!

[Thunder081]

Would be awesome if one of the MetService lurkers could download a hi res rain radar loop for the 24 hours of the event in Auckland and post. Certainly one for the ages that’s for sure.

Here's a 120km radar timelapse from 12:00pm - 10:00pm

Also here's the images in a zip file with the time in 24hr in the file names https://www.mediafire.com/file/5itx33s5 ... s.zip/file

[David]

Radar is looking quite interesting. Up to 28mm for the day here.

[Nev]

Yeah, just got another 18mm here in the last hour from that T-storm (35mm since 9am).