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Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 10:08
by Awhituobs
you can see that extra moisture band for north Canterbury that you are getting Richard on the rain radar
looks like its been fed a bit from moisture enjected from further north?
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 10:12
by Richard
Yes its quite interesting how its being feed in from the SE. Not a breath of wind at the moment
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 10:14
by tich
Banks Peninsula snow/rainshadow sheltering Chch this morning, so just cloudy. Could see a slight dusting of snow on Sugarloaf.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 10:34
by Lawrence
Had a bit of sleet and snow during the night here,but was quickly dissolved by the rain.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 10:38
by Tracy Herbert
Quite a pleasant day in Rakaia, no wind, no rain just overcast and now blue sky appearing from the south. Not chilly cold outside either.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 12:34
by TonyT
A number of soft hail showers here this morning.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 12:45
by Lawrence
Looking a bit dark to the south of here at the moment. Prominent virga
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 13:14
by Lawrence
TonyT wrote: ↑Mon 08/08/2022 12:34
A number of soft hail showers here this morning.
One just came through now, fairly moderate enough to turn the lawn white in patches, but quickly through.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 13:22
by mikestormchaser
One thing in my opinion with these cold set ups is they arnt the tru wintry blasts we normally see without the convective clouds we would have, had the upper temperature aloft be alot colder. 500mb temp sitting on a mild -26 which in my mind is pretty warm for a winter cold outbreak.the CBs would lower the freezing level. These cold set ups are more at the surface. Inland places like castle hill should be getting a hammering with alot of the moisture pointing that way today.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 13:42
by Bradley
mikestormchaser wrote: ↑Mon 08/08/2022 13:22
One thing in my opinion with these cold set ups is they arnt the tru wintry blasts we normally see without the convective clouds we would have, had the upper temperature aloft be alot colder. 500mb temp sitting on a mild -26 which in my mind is pretty warm for a winter cold outbreak.the CBs would lower the freezing level. These cold set ups are more at the surface. Inland places like castle hill should be getting a hammering with alot of the moisture pointing that way today.
0.5cm of snow recorded at 320m asl in Mid-Canterbury for this event, I wonder if those 500mb temps of around -26 was the cause of snow amounts being massively lower then forecast around that 300m asl level? Even with 850hpa temps of -7C and -8C around? Surely these forecasters who do this for a job would have picked that up though in their forecast? Something isn't adding up...
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 14:08
by darcyplumb
Sleety shower moving through here right now.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 14:23
by Orion
darcyplumb wrote: ↑Mon 08/08/2022 14:08
Sleety shower moving through here right now.
Clouds visible to the east at the moment have that yellowish cast to them that means 'snow'.
Temp. currently 4.9°, has fallen a little over the past hour or so.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 14:31
by Dean.
Bradley wrote:mikestormchaser wrote: ↑Mon 08/08/2022 13:22
One thing in my opinion with these cold set ups is they arnt the tru wintry blasts we normally see without the convective clouds we would have, had the upper temperature aloft be alot colder. 500mb temp sitting on a mild -26 which in my mind is pretty warm for a winter cold outbreak.the CBs would lower the freezing level. These cold set ups are more at the surface. Inland places like castle hill should be getting a hammering with alot of the moisture pointing that way today.
0.5cm of snow recorded at 320m asl in Mid-Canterbury for this event, I wonder if those 500mb temps of around -26 was the cause of snow amounts being massively lower then forecast around that 300m asl level? Even with 850hpa temps of -7C and -8C around? Surely these forecasters who do this for a job would have picked that up though in their forecast? Something isn't adding up...
Methven at 320 metres recorded 5cm here in Mid Canterbury
Sent from my SM-A226B using Tapatalk
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 14:35
by Lawrence
darcyplumb wrote: ↑Mon 08/08/2022 14:08
Sleety shower moving through here right now.
Seeing them showers clearly on the radar at the moment. We are getting a few threatening looking showers here but they seem to be weakened as they are skirting around the edge of Banks Peninsular. I'm sort of sitting just off to side the shadow.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 14:55
by darcyplumb
Orion wrote: ↑Mon 08/08/2022 14:23
darcyplumb wrote: ↑Mon 08/08/2022 14:08
Sleety shower moving through here right now.
Clouds visible to the east at the moment have that yellowish cast to them that means 'snow'.
Temp. currently 4.9°, has fallen a little over the past hour or so.
The shower activity seems to be increasing offshore. We’ve been mostly dry all day. Just doing school pick up and another sleety shower falling, a lot heavier than the first.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 15:54
by Richard
We havent had a lot of rain, 30mm in the last two days, the water table starts to drop a little next thing its back to how its been for weeks on end. At least the natives will handle sitting in water.
driveway.JPG
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 16:34
by NZ Thunderstorm Soc
Hail here in the street in Geraldine around 1:40pm, sorry I mean 1pm.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 16:40
by mikestormchaser
Bradley wrote: ↑Mon 08/08/2022 13:42
mikestormchaser wrote: ↑Mon 08/08/2022 13:22
One thing in my opinion with these cold set ups is they arnt the tru wintry blasts we normally see without the convective clouds we would have, had the upper temperature aloft be alot colder. 500mb temp sitting on a mild -26 which in my mind is pretty warm for a winter cold outbreak.the CBs would lower the freezing level. These cold set ups are more at the surface. Inland places like castle hill should be getting a hammering with alot of the moisture pointing that way today.
0.5cm of snow recorded at 320m asl in Mid-Canterbury for this event, I wonder if those 500mb temps of around -26 was the cause of snow amounts being massively lower then forecast around that 300m asl level? Even with 850hpa temps of -7C and -8C around? Surely these forecasters who do this for a job would have picked that up though in their forecast? Something isn't adding up...
Yes I'm just picking out some points, basic stuff really and it's only my opinion. There was no real cold upper troughing with the cold event. So nothing to enhance anything.
I personally like a 700mb temp of -18 or colder for any chance sea level snow for coastal south island. Today was -16 at best. The THK levels way to warm. I'm no expert on snow systems aside generally like to concentrate on thunderstorms. Just my thoughts anyways
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 17:14
by NZ Thunderstorm Soc
Another hail photo from today.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Mon 08/08/2022 20:26
by NZ Thunderstorm Soc
Here's another photo of the hail shower that moved across here just before 1pm today taken from the backroom window.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Tue 09/08/2022 07:20
by darcyplumb
Some interesting conditions here this morning that I thought were worth a mention. I’ve been awake since 5am, light snow accumulations on the ground again. There’s been snow and sleet falling since I got up which stopped 15 minutes ago. There has been a steady accumulation of ice on the vehicles and house with the sleet falling which isn’t something that happens here often. Temp currently 0.9 degrees with the radar showing more showers coming.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Wed 10/08/2022 18:24
by Thunder081
Some pictures from inland Canterbury on Monday morning at 300 - 500m asl
IMG_20220808_104122.jpg
IMG_20220808_100640.jpg
IMG_20220808_101116.jpg
IMG_20220808_104126.jpg
Re: Cold easterly airflow 7th - 12th Aug
Posted: Wed 10/08/2022 22:39
by NZ Thunderstorm Soc
After a good frost, and a red sunrise and sunset, a blue dome day eventuated. A light but cold southerly wind. Maximum temperature was 8.8C.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Thu 11/08/2022 08:30
by darcyplumb
A number of school bus services cancelled for Methven schools today due to what the locals are calling ‘very unexpected snowfall’ overnight.
Re: Cold easterly airflow 7th - 12th Aug
Posted: Thu 11/08/2022 11:05
by mikestormchaser
darcyplumb wrote: ↑Thu 11/08/2022 08:30
A number of school bus services cancelled for Methven schools today due to what the locals are calling ‘very unexpected snowfall’ overnight.
Not surprised to hear the snowfall there. The THK levels overnight and today are cold, Colder than they were on Monday from what I saw on the GFS last night. Big frosts coming tonight and over the weekend, Over eastern areas and severe inland.
Need to be taking care on the roads for next few mornings.