Deepening low prediction/ cold outbreak Mid June
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Re: Deepening low prediction/ cold outbreak Mid June
is it just me or has that line of showers just drifted inshore a tad?
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Re: Deepening low prediction/ cold outbreak Mid June
Not you...they have...won't last, though...?Razor wrote:is it just me or has that line of showers just drifted inshore a tad?
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Re: Deepening low prediction/ cold outbreak Mid June
Looks like it has edged a little closer, possibly clipping the Port Hills now with some snow.
Could be an outside chance of a few good showers coming through in the next few hours but very coastal, snow flakes still a possibility going by how steady those showers are on the radar.
Could be an outside chance of a few good showers coming through in the next few hours but very coastal, snow flakes still a possibility going by how steady those showers are on the radar.
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Re: Deepening low prediction/ cold outbreak Mid June
Never really bought that too much to tell you the truth, I've been inclined to think it's more to do with temp gradients, and for snow settling, the typically saturated state of the soil during winter. You normally only have to travel a short distance inland in any direction to see significant increases in accumulation. The Stewart Island hypothesis just doesn't seem very geographically sound, especially when talking about increases in snowfall to the E.NZstorm wrote:southernthrash wroteStewart Island has a major sheltering effect on Invercargill in SW flows and I'm sure thats part of the reason why the city gets less snowfall than eastern areas.it certainly looks as though Invercargill missed most of the precip., which is often the case in these events.
And I should have said accumulation, rather than precip sorry. I have no doubt that a fair whack of snow fell last night (having seen it), but it wasn't settling in a hurry.
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Re: Deepening low prediction/ cold outbreak Mid June
Saturated soil state wont be a factor but Invercargill temps probably are.Never really bought that too much to tell you the truth, I've been inclined to think it's more to do with temp gradients, and for snow settling, the typically saturated state of the soil during winter.
Mid afternoon sat pic, perhaps some sheltering showing up for Invercargill from Stewart Island in this snap shot.
http://satellite.landcareresearch.co.nz ... d16069.txt
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Re: Deepening low prediction/ cold outbreak Mid June
Hmm sky radar update suggests it should be raining accross town now...or worse?
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Re: Deepening low prediction/ cold outbreak Mid June
It certainly does have an effect but obviously there is a critical direction. It doesn't stop all precip but cuts it down quite a bit.The Stewart Island hypothesis just doesn't seem very geographically sound,
Invercargill is also a fairly maritime location so the sea warms the low level air in wintry conditions.
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Re: Deepening low prediction/ cold outbreak Mid June
A photo taken at lunch time in Macandrew bay.
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Berkshire North of Te Anau west of Hokitika.
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Re: Deepening low prediction/ cold outbreak Mid June
yup...sleety rain confirmed here. seems to be settling in too...7.45 radar shows it might last a wee while. A temp drop would be handy now
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Re: Deepening low prediction/ cold outbreak Mid June
Looks like the showers are swinging into that chain line thing they often do .
Heavy snow on the Port Hills now too.
Heavy snow on the Port Hills now too.
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Re: Deepening low prediction/ cold outbreak Mid June
hail shower here with some flaaaaaaakes in the mix
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Re: Deepening low prediction/ cold outbreak Mid June
Went up for a drive on port hills, yeah its snowing up there ineedy!
summit road it is settling so i thought i would turn back because i don't particularly want to get stuck or slide off the cliff
The latest radar does look good with those showers joining up and and quite good depth to them to.
The main key for me again would have to be the lack of moisture..
But hey there will come a time when we will get a warm advection snow event, we are due for a big dump again in Christchurch.
summit road it is settling so i thought i would turn back because i don't particularly want to get stuck or slide off the cliff
The latest radar does look good with those showers joining up and and quite good depth to them to.
The main key for me again would have to be the lack of moisture..
But hey there will come a time when we will get a warm advection snow event, we are due for a big dump again in Christchurch.
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Re: Deepening low prediction/ cold outbreak Mid June
Yes, just been up the port hills around Victoria Park area for the last hour - hour and a half and have had several nice snow showers. Good thick flakes as well. Also managed to catch a pure snow shower in Barrington ( so reaching to sea level at times, probably from an isolated heavier pocket). If this chain shower hangs about and takes a while to clear like it normally does then the port hills could get 2-3cm settling on the ground by morning.
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Re: Deepening low prediction/ cold outbreak Mid June
Just cold sleety rain now in central Chch, no snow. (yet)
Reports of snow to unusually low levels again in parts of lower North Island this afternoon, eg Marton and Pahiatua. East Coast probably getting the full impact of the southerly now. (Gisborne down to 5C at 9pm, with recent precip)
Reports of snow to unusually low levels again in parts of lower North Island this afternoon, eg Marton and Pahiatua. East Coast probably getting the full impact of the southerly now. (Gisborne down to 5C at 9pm, with recent precip)
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Re: Deepening low prediction/ cold outbreak Mid June
SNOW SHOWER!! Nice one too atm, dont know if it will last, prob an isolated heavy pocket but never the less its snowing!
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Re: Deepening low prediction/ cold outbreak Mid June
Sleet and snow in St Albans. Wind has picked up a lot too.
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Re: Deepening low prediction/ cold outbreak Mid June
yup grapel turnd to snow here to.. then back to grapel again.. my car is white and the road has a coating to.
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Re: Deepening low prediction/ cold outbreak Mid June
Probably been some flakes in central city too, but I couldn't be bothered going outside in the cold to look all the time.
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Re: Deepening low prediction/ cold outbreak Mid June
I don't blame you, Ben Stay in the warmth.tich wrote:Probably been some flakes in central city too, but I couldn't be bothered going outside in the cold to look all the time.
Nothing out here, just a cold wind and 2.8C now.
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Re: Deepening low prediction/ cold outbreak Mid June
Just had some rain here with sleet , southerly breeze picked up abit too.
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Re: Deepening low prediction/ cold outbreak Mid June
Snow has settled on the cars outside now, just very light falls though
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Re: Deepening low prediction/ cold outbreak Mid June
Hasnt done anything here for around 20-30mins now unfortunately. The chain line seems to have been broken. I guess 11pm radar will tell the story.
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Re: Deepening low prediction/ cold outbreak Mid June
Saturated soil has a greater thermal capacity (due to increased water content), this changes the thermal inertia of the soil, and slows down radiative heat loss. Subsequently, the lag between cooling of soil and air increases, meaning that the surface onto which snow falls is relatively warm, causing melting of snowflakes on impact, therefore snow can't settle. This effect has been observed with the presence of asphalt and concrete overburdens as well.spwill wrote:Saturated soil state wont be a factor but Invercargill temps probably are.Never really bought that too much to tell you the truth, I've been inclined to think it's more to do with temp gradients, and for snow settling, the typically saturated state of the soil during winter.
Mid afternoon sat pic, perhaps some sheltering showing up for Invercargill from Stewart Island in this snap shot.
http://satellite.landcareresearch.co.nz ... d16069.txt
Dunedin has just as much, if not more, of a maritime climate as Invercargill.
Also, if you consider the direction of flow today, which here had a considerable W component, the Stewart Is thing still doesn't really hold much sway. A correlation between a trough in the wave pattern induced by mountains in Fiordland / W Southland hills and Invercargills location seems more likely...
Interesting to note that such effects are not seen for Dunedin under the same conditions, when topographic barriers are larger and more numerous.
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Re: Deepening low prediction/ cold outbreak Mid June
Should also add, I have just been out in Makarewa (just north of Invercargill) where I was surprised to see there was still plenty of snow on the ground, and some pretty decent ice as well.
Had a hail / sleet shower on the drive back into town, so still pretty cold out there.
Had a hail / sleet shower on the drive back into town, so still pretty cold out there.