20th-21st July Weekend - Low and Cold snap

[gllitz]

Chch usually gets light S-SW winds in moderate NE airflow, only gets properly NE once the flow picks up strength (which it doesnt look like this one will do).

I have to ask....HOW??

NE airflow "bouncing off" BP or something similar?

[mikestormchaser]

but then again its not going to snow anyway is it .
Cheers
Jason.

thats right jase its not going too snow
dull, wet foggy conditions here now in Addington area and yes it is light S

[gopolks]

but then again its not going to snow anyway is it .
Cheers
Jason.

thats right jase its not going too snow
dull, wet foggy conditions here now in Addington area and yes it is light S

Well up to 400 metres on banks penisula, but for us ppor folk at sea level, its just going to be dull and grey with light rain.

[mikestormchaser]

thats right jase its not going too snow
dull, wet foggy conditions here now in Addington area and yes it is light S

Well up to 400 metres on banks penisula, but for us ppor folk at sea level, its just going to be dull and grey with light rain.

yup Wont be much, not enough precipitation, i say...
Cold S change tomorrow afternoon brings showers with snow too down as low as 300m sunday, showers with light snow 400m very cold and clearing.
im no forcaster but if you ask me anything thats, my prediction.
Man its foggy in this part of the city now!!

[Lawrence]

Looks like it's being spun and squeezed between the Jet stream and a developing pressure system fom the south, the high over Australia is'nt moving much as well.

So what does it mean for the upcoming weather?

Sorry it took so long to answer , well I think that as the pressure builds from the South followed with a strong jet stream,both streams will meet as the low moves closer to the west coast, I'm not entirely sure. .I know that its going to be really cold though

[Michael]

They get undercut if I am correct?
thats why Ch has lots of windless days

Chch usually gets light S-SW winds in moderate NE airflow, only gets properly NE once the flow picks up strength (which it doesnt look like this one will do).

I have to ask....HOW??

NE airflow "bouncing off" BP or something similar?

[NZstorm]

Its kind of ironic that Saturdays cold change will bring a rise in temperatures to much of the South Island. Weather looks milder next week which will please people in central Otago in particular.

[Storm Struck]

Well I say no more .
Still looks ok in my eyes.
Cheers
Jason.

[NZ Thunderstorm Soc]

Yes it needs a good southerly or SW blast to get rid of the "'Clag" down here and in SI central regions of recent days or week.
Unfortunately the surface pressures will not be low enough for a good storm but at least it will change the current weather pattern and the north will be looking forward to higher pressures to give them fine weather this coming week
No more effing AEC lows forming and moving across the top of the North Island.

JohnGaul
NZTS

[03Stormchaser]

Models have been consistent with showing snow down to 300m. Fingers crossed Hamner will get a snow fall over night!

[NZstorm]

Its kind of ironic that Saturdays cold change will bring a rise in temperatures

Ofcoarse I was refering to inland areas with this comment.

Models have been consistent with showing snow down to 300m

Yes, looks like they will be bang on for today.

[Andy]

Calm and foggy in Alexandra, temp has actually dropped -0.7 degrees since 9am this morning.
Current temp is -4.7 edgrees C

[gopolks]

CHCH this morning is its usual, crappy cloudy miserable, light drizzle, no excitement what so ever.

No weather action here.

[Lawrence]

Here's my midday report from Rolleston,Baro holding steady at 1008, 6.4 c and rising,RH 93%,wind S.W. 6.5kph,max Gust was just 16.9kph at 12:01,Overcast 100%

[gopolks]

latest from that burwood weather station.

Temperature: 5.5°C Warmer 0.6°C than last hour.
Heat Index 5.5°C
Wind Chill 4.7°C

Humidity: 98 %
Dewpoint: 5.2°C
Wind Speed: Calm Wind fromS
Gust Speed: 14.8 km/h
Gust Last Hour: 20.9 kmh S
Barometer: 1012.3 hPaRising 0.30 hPa/hour.
Today's Rain: 0.2 mm
Days with no rain: 0 days
Sunshine Today: 00:00

[Storm Struck]

First time I have seen chch under a snow symbol this winter i think but forecasting sleety showers by MS.
Still wouldnt rule out sleety showers overnight either, currently 6.3C with a breezy southerly and overcast so I don't think the temperature is going to rise that much before the change.
I was looking at the isobaric map and noticed a warm front moving south attached to a low off the south island east coast, this would be ideal if it pushed ashore more but perhaps the Chatams may just see some white stuff.
Cheers
Jason.

[Gary Roberts]

First time I have seen chch under a snow symbol this winter i think but forecasting sleety showers by MS.

I wish the Met Service would get over June 2006 already. They have gone from conservatism to the opposite extreme. Nothing but blue sky and fog in the Mackenzie and no reason to think that's going to change.

[gopolks]

Well they shouldnt predict snow because the sun is now out and it seems to be clearing in my part of town.

[gopolks]

Temperature: 6.4°C Warmer 1.1°C than last hour.
Heat Index 6.4°C
Wind Chill 4.2°C

Humidity: 98 %
Dewpoint: 6.1°C
Wind Speed: 14.4 km/h Wind fromSSW
Gust Speed: 18.5 km/h
Gust Last Hour: 19.3 kmh SSW
Barometer: 1012.1 hPaFalling 0.20 hPa/hour.
Today's Rain: 0.2 mm
Days with no rain: 0 days
Sunshine Today: 00:00
Time of Last Lightning: 12:57:53 2007/07/21
Last strike recorded: 710 KM @ 7°

[Andy]

Small snow flakes falling, temp -1.6, still the fog hangs around

[Janos]

A constant temperature up and down the coast 6.2deg at the moment on the Peninsula.

[gopolks]

Has the cold front come through chch yet? because if so, it anit that strong.

[NZ Thunderstorm Soc]

Here's my midday report from Rolleston,Baro holding steady at 1008, 6.4 c and rising,RH 93%,wind S.W. 6.5kph,max Gust was just 16.9kph at 12:01,Overcast 100%

Same here at West Melton, although the sun did pop out briefly just before onepm

JohnGaul
NZTS

[melja]

No the cold front has not come through yet.

[03Stormchaser]

If you takea look at the models it isnt due to hit ChCh till this evening.

Its a bit stupid to be saying its a fizzer before the event has even happened, and if metservice has snow icons out and its currently sunny, maybe some paitence is needed till the southerly has 'actually' come thru!! Then comment on whether or not metservice were right in there forecast.