NSW/ACT Cold Front and ECL - August 23-25

Winterwolf

One of Us
Jun 2, 2019
144
290
163
Looks like the low is off Lake Macquarie going by radar? Could be a temporary clearing out of Sydney while the low orientates itself, so that 9 degree temp at Obs Hill might not last too long?
 
  • Like
Reactions: Snowmaker7

Steve777

One of Us
Ski Pass
Ski Pass
Jul 4, 2019
1,307
3,749
363
Artarmon, Sydney North Shore
A rain hole moving Southwards over Eastern Sydney:

Capture Radar 20210824.JPG


Still just 9.3 deg in Sydney OH, up from 8.7 at 11:00.

Event total so far at OH: 43 mm.
 
Remove ads with a
Ski Pass

POW Hungry

Old n' Crusty
Moderator
Ski Pass
May 28, 2000
23,700
38,786
1,063
Eastern Burbs of Sydney
We're seeing light showery stuff here in Bondi but certainly no clearing, as such.
Bringing it back on shore (under Westerlies at the surface) shortly.
 

Wavey

One of Us
Ski Pass
Jul 3, 2019
809
1,552
263
Wollongong, NSW
The models are still going for some big winds here tonight. FWIW, EC has been quite accurate with the wind gust predictions so far today (I have chosen Kiama because it's the most exposed to SW winds).
Here is 9am:

1629772375703.png

Gusts on the ground were mainly maxing out around the 60 and 70s but a peak of 83km/h at Kiama.
And 12pm:
1629772468426.png

Kiama and Albion Park just had some 80+ km/h gusts not long ago

1629772650841.png

1629772681557.png


And now for tonight's predictions, 9pm:

1629772742946.png


Certainly going to be wild around here.
 

Wavey

One of Us
Ski Pass
Jul 3, 2019
809
1,552
263
Wollongong, NSW
After not too much action this morning, the wind is really starting to pick up here in the last half hour or so.

Ooft 106km/h at Montague.
 

Winterwolf

One of Us
Jun 2, 2019
144
290
163
High Range is starting to drop but temps in Bowral are annoyingly bucking the trend and heading up. Assume it's the positioning of the low at fault and we might see temps start to fall once the low heads more east. It seems to be having a nice time heading north up to the Hunter at present.
Would not be surprised to see 10+ cm in the BMs looking at the last image.
 

warrie

One of Us
Ski Pass
Jun 15, 2008
1,009
980
363
Sydney
Solid totals across the upper catchments in central NSW. Going to be some full storages. With widespread 25mm+ across upper Warragamba catchment i wouldn't be surprised if it goes over again? Its 1m below spillway. No warnings out.
Barely budged - up 6 cm - now back to 4cm -but it takes a few days to flow in from Goulburn:
1629783579283.png
 

warrie

One of Us
Ski Pass
Jun 15, 2008
1,009
980
363
Sydney
So is at a bomb? Once the TV news gets onto it. LOL ..... Checking BoM chart for 10 am today the central pressure is 1003 hPa. 24 hours earlier at the same coordinates it was 1012. So a fall of just 9 hPa- a tom thumb at best--- so far. BoM prog is to go to 995 so only -17 in 48 hrs
 

POW Hungry

Old n' Crusty
Moderator
Ski Pass
May 28, 2000
23,700
38,786
1,063
Eastern Burbs of Sydney
So is at a bomb? Once the TV news gets onto it. LOL ..... Checking BoM chart for 10 am today the central pressure is 1003 hPa. 24 hours earlier at the same coordinates it was 1012. So a fall of just 9 hPa- a tom thumb at best--- so far. BoM prog is to go to 995 so only -17 in 48 hrs
That's a bomb.
The parameters you talk of are set at 60S (or N) as a benchmark for mid-latitude.
 

warrie

One of Us
Ski Pass
Jun 15, 2008
1,009
980
363
Sydney
That's a bomb.
The parameters you talk of are set at 60S (or N) as a benchmark for mid-latitude.
I quoted from the Ch 7 weather woman, who said 24 hPa in 24 hrs. From Wiki for the rest of forum
"In 1980, Sanders and his colleague John Gyakum defined a "bomb" as an extratropical cyclone that deepens by at least (24 sin φ/ sin 60°)mb in 24 hours, where φ represents latitude in degrees. This is based on the definition, standardised by Bergeron, for explosive development of a cyclone at 60°N as deepening by 24 mb in 24 hours.[15] Sanders and Gyakum noted that an equivalent intensification is dependent on latitude: at the poles this would be a drop in pressure of 28 mb/24 hours, while at 25 degrees latitude it would be only 12 mb/24 hours. All these rates qualify for what Sanders and Gyakum called "1 bergeron"

Low centre at about 35*S so the 9 hPa is NOT a bomb as it would need to be between 12 and 24hPa.
 
  • Like
Reactions: piolet

Snowmaker7

One of Us
Jul 25, 2013
440
1,226
263
Bowral, NSW
Great link! Nth K-Town Cam (looks like the Heavy Vehicle weighing station at Mt Boyce?) showing flakeage + settling

1629785219936.png
Someone can probably correct me, but if you click on that cam it takes you to a point just north of Blackheath on the GWH. A bit more consistent with the settling I've seen in other Blackheath social media posts. Impressive nonetheless
 

ecowain

One of Us
Ski Pass
Apr 14, 2003
2,704
4,435
363
Mount Victoria, NSW
Yes. It’s just near the heavy vehicle station between blackheath and mount vic.

It’s one of the cams on the Airservices link above.

When it’s clearer, the other directions are more useful
 
Remove ads with a
Ski Pass

Log in

or Log in using
Remove ads with a
Ski Pass