General December Weather

[Tornado Tim]

Tomorrows prospects are interesting, a big factor will be cloud cover as we have no cap and any early convection will hinder setup somewhat.

Since 500hpa is quite cold around -21/22 degrees, hail is probable/likely. Size will depend on decent shear, BOP seems to have the most with a SFC southerly progressing up throughout the afternoon, converging with a light N/NW then interacting with an upper NW.

Hail accumulation is more likely to be significant factor to consider tomorrow as any decent showers develop they will tend to drop hail in the payload.

Will have a look at prospects tomorrow again to see if its worth taking a drive.

[Orion]

Overcast, raining, 6°C: pathetic.

[Richard]

Pathetic, but welcome rainfall, 56mm since Wednesday, 545mm for the year.

[Cantab03]

35mm here over the last few days. Didn't get as much as I thought we would yesterday, but heavy showers overnight has brought 12mm so far today. IN the very early hours of Christmas morning, managed to get 2.6mm of rain in 10 minutes which is heavy for here! YTD still well below average but looking better at 385mm.

[Awhituobs]

North islands turn next

20201227_072703.jpg

[NZstorm]

The cold pool is timed nicely with peak heating.

A risk of severe hail in the western Bay of Plenty this afternoon I think. Dewpoint in Tauranga this morning looks good 10C.

gfs 500mb temp chart 1pm.

[Awhituobs]

Shower movement on the radar over BOP shows a NW flow there...is that surface or upper level?

[spwill]

Amazing cold trough for the time of year but a mostly sunny and dry day for Auckland

[NZstorm]

Mainly Fine yesterday in Timaru despite the rain forecast, shower clouds inland.

[spwill]

Another trough across NZ for early New Year, perhaps we will get something interesting from that one.

[NZstorm]

Shower movement on the radar over BOP shows a NW flow there...is that surface or upper level?

WNW aloft today but turning S later.
On the surface S but onshore flow near the coast this afternoon.

[Orion]

Pathetic, but welcome rainfall, 56mm since Wednesday, 545mm for the year.

Ya, rain is Good, that temperature was a bit unnecessary though

Now 7.7°C and probably between showers.

[jamie]

Thunder shower here. Shame it came through so early in the day.
I’m tempted to follow it into western BOP.


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[Tornado Tim]

Got Thunder here now.... Fairly early on, shows lapse rates are good.

[jamie]

Got Thunder here now.... Fairly early on, shows lapse rates are good.

Tim will you chase into BOP?


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[Tornado Tim]

Got Thunder here now.... Fairly early on, shows lapse rates are good.

Tim will you chase into BOP?


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Will see, this stuff that's developing now is now creating lots of cloud cover. Might not be able to see storms as well. Will probably decide at 2PM.

Based on Himawari Vis there is an LLCC pass through North Waikato/South Auckland atm, this is causing early convergence with the southerly, this will move away to the east.

[jamie]

The storm in north Waikato looks to have broad rotation with the radar showing it rotating around itself. Wonder if it will have low level tight rotation to form a super cell?


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[Awhituobs]

strikes

strikes.png

[jamie]

Heaps of thunder near me at the moment. Even a tiny funnel formed a few times. Overall today has been nothing to write home about for here. Ive seen some people got hail and a lightning strike caught a swamp in hauraki on fire.


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[Awhituobs]

View of North Waikato from Waiuku

[David]

Feels like a cold night coming up. Perhaps dipping below 10, unusual for this time of year.

[David]

Wow, thunder!

[Cyclone Tracy]

Thunder heard here as well. As already mentioned, uppers are nice and cold.

[Awhituobs]

Hail and thunder at our place

[tornado]

Thunder here too. Made it here. Unexpected. I thought it was all south but it made. It