Small surf continues but watching the South Pacific for potential TC intrusion into the Coral Sea
South-east Queensland and Northern NSW Surf Forecast by Steve Shearer (issued Fri 1st Dec)
Features of the Forecast (tl;dr)
- Small weak surf extending into the weekend with light winds
- Small S-S/SE swell Mon/Tues with S-SE winds
- Tracking potential tropical depression or TC near Solomon Is later next week, odds firming on a cyclone swell as it enters Coral Sea- check back Mon for revisions
- Building E’ly tradewind swells at a minimum likely into next weekend
Recap
Small and clean yesterday with a hot W/NW-NW flow before N'ly breezes and size in the 2ft range. Similar winds today with the MNC picking up a small signal of SE swell from a low off the South Coast and the rest of the region seeing small NE swells to 1-2ft.
This weekend (Dec 2-3)
Few tweaks the weekend f/cast, mostly in terms of local winds. Low pressure has moved off the Far South coast and is slow moving, with a broad fetch of strong E’ly winds on the southern flank of the low supplying some small 2ft SE swell to the MNC. Elsewhere we’re looking at small, weak NE swells to 1-2ft or less. A lingering trough off the MNC is maintaining a hot NW flow through the region with clean conditions for Sat morning before winds tend N/NE in the a’noon.
Light offshore winds again for Sun morning before a variable SE/NE flow as the trough stalls out and dissipates across the region. Not much surf expected with a very small weak signal from the NE in the 1-1.5ft range.
Next week (Dec 4 onwards)
Looks like a small troughy area advancing up the NSW Coast early next will steer a S-SE flow through the f/cast region, possibly light early and tending to mod/fresh SE’lies during the day. We’ll see some small S and S/SE swells, from a parent front/low which traversed the lower Tasman on the weekend and more local onshore winds. Not much to it- 2-3ft at S facing beaches and with the onshore flow keep expectations low.
Weak high pressure moving NE into the Tasman brings light land and SE seabreezes Tues, tending more E-E/NE on the MNC. Not much surf expected, just some small weak windswell, possibly tending to NE windswell in the a’noon. Nothing more than 1-2ft under current modelling.
A trough mid week brings a weak S’ly change late Wed on the MNC before stalling with potential for a small, clean morning before the change and small weak surf to 1-2ft. Again, nothing to get excited about.
Further ahead and some weather model runs are starting to look pretty damn juicy with respect to a developing TC in the South Pacific moving into the Coral Sea later next week. Still very early days but a full blown cyclone swell is now a definite possibility, possibly as early as next weekend and into the week 9/12 - initially very much favouring QLD and NENSW.
A more bog standard E-E/NE trade-swell also looks highly likely later next week and into the weekend as high pressure and the southwards moving depression/TC combine.
Obviously, expect revision, possibly major when we come back on Mon.
Until then, have a great weekend!
Comments
Eerily good agreement between latest GFS and EC runs too.
Juicy/scary prospects on charts this morning.
We could have a Cat 3 or above TC in the Coral Sea next week.
looks like it might get up close and personal if all comes together
Fingers crossed GFS wins the long game and it stays out to sea.
EC this morning not looking good for surfers or CQlders.
Maybe stupid question.
But does warmer sea temps coming down further south mean cyclones would travel further south than normal or this isn’t a factor ?
Yes, it means that it's likely to maintain its tropical warm core structure for longer.
And here's the 18Z GFS run. Getting close!
heres hoping it stays east !!
whats the lowest hectapascle a cyclone has got in our waters or neighbouring ??
I’m still leaning towards her getting whisked away to the SE.
Or possibly stalling in the Coral Sea. It's a good ridge to the south.
EC is the better model on average, but after 29 years of forecasting, I have a soft spot for GFS when it comes to TCs.
Yep what I said. Mad waves are possible.
That local wind prediction tho...
Latest GFS run, 12Z 02/12. Starting to look scary.
And 06Z GFS ensemble tracks, for the keen:
https://www.tropicaltidbits.com/storminfo/92P_gefs_latest.png
A coast hugger or crossing would be devastating.
Latest EC similar, but crucially has centre staying out to sea. Fingers crossed for you guys; parts of NZ (Hawkes Bay) still a wasteland after TC Gabrielle.
https://www.tropicaltidbits.com/analysis/models/?model=ecmwf®ion=swpa...
EC's tropical storm outlook.
geez it's not looking great
Ok the shits not looking good ATM.
B. TROPICAL DISTURBANCE SUMMARY:
(1) THE AREA OF CONVECTION (INVEST 92P) PREVIOUSLY LOCATED NEAR
8.9S 168.8E IS NOW LOCATED NEAR 8.9S 168.0E, APPROXIMATELY 476 NM EAST
OF HONIARA, GUADALCANAL. ANIMATED MULTISPECTRAL SATELLITE IMAGERY AND
A 020205Z AMSR2 89 GHZ MICROWAVE IMAGE DEPICT A BROAD AND WEAKLY
DEFINED LOW-LEVEL CIRCULATION (LLC) WITH SCATTERED DEEP CONVECTION
ALONG THE NORTHERN PERIPHERY. ENVIRONMENTAL ANALYSIS INDICATES THAT
92P IS IN A FAVORABLE ENVIRONMENT FOR DEVELOPMENT WITH ROBUST OUTFLOW
ALOFT, LOW (5-10 KTS) VERTICAL WIND SHEAR, AND WARM (29-30 C) SEA
SURFACE TEMPERATURES. GLOBAL MODELS ARE IN GOOD AGREEMENT THAT 92P
WILL TRACK WESTWARD TOWARD THE SOLOMON ISLANDS AND CONTINUE TO DEVELOP
OVER THE NEXT 48 HOURS BEFORE MAKING A POLEWARD TURN AT AROUND TAU 96.
MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 20 TO 25 KNOTS.
MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1006 MB. THE
POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN
THE NEXT 24 HOURS REMAINS MEDIUM.
Latest GFS run (00Z), looking much less ominous.
Hope your right bud.
What I’m seeing 10 days out is scaring the shit out of me.
Last day or so of tropicaltidbits run, which I thought was GFS has it swinging into the nth coast nsw.
I’m no weather guru at all so I rely on you guys that can decipher the modern internet stuff.
Like I said mate
Hope your right.
I take it back.
I just got a better version of gfs and it has it brushing the coast.
Still,
Don’t want any floods on the nth coast.
if it comes too close to the coast, is the problem that it will destroy all the banks? sorry for the ignorance, never got round to learning how to read weather systems etc. i just see a TC and get frothed for north facing stretches of coast.
Well, in relation to surfing yes, if it's too close to the coast it will just be a big blustery mess. Locations south of the cyclones centre will also experience significant storm surges, leading to extensive beach erosion, so that'll further ruin surf banks.
I think the comments on here are more concerned about the associated damage to land close to the coast if it were to make landfall.
ah ok thanks, didnt realise it was that strong
Back to hugging the coast, sorry.
Following the possible development and movement of a TC is a good exercise in humility.
https://www.tropicaltidbits.com/analysis/models/?model=gfs®ion=swpac&...
holy,
given we are in that first transition year back to el nino, what have previous cyclones done in this same time period,
also whats the lowest one of these storms has ever gotten down too?
That would be a rather remarkable weather event were it to come off like that.
Wow, wouldn't a path like that be a lump of coal in the stocking.
if it follows that trajectory they have atm then it wont be a merry xmas for a lot of people.....
I’m Barracking for EC now, fickle fan.
Yeah latest GFS is deadly.
Specific-path model runs a week out are pretty useless IMO. There'll be a southerly-track TC in the Coral Sea but that's about all to bank on
Indeed.
Nobody would stake a claim on one model run (say GFS at 00Z on day xx/yy) a week out, but when you keep following model runs and comparing different models, you get a better understanding of where the battle lines are, so to speak. Is the blocking ridge of high pressure strengthening or weakening? Is there a sharp upper trough coming in from the west which may pick up the system and steer it eastwards? Etc etc.
Combined with the use of ensemble models you will not only increase you forecast skill but also your understanding of system and synoptic features.
True... useless was maybe not the correct term... mitigated-utility? I'm just dreading a news.com.au doom-article for a "2000km cyclone" or something based on far-off model runs. Maybe Swellnet could run a betting service? Odds based on models. Coast-hugger/Crossing/No-crossing??
I can see it coming as well (news hype) if the models keep sniffing further south.
EC's latest thoughts..
interesting that their probability map indicates that their forecast is probably wrong.
or I'm wrong.. but I would have thought that for the 2 to align, the green blob should be dead centre over the position of the low on 13th Dec in the synoptic forecast.
It’s based on the ensemble forecasts not just the current EC model run I believe.
“The maps show the strike probability based on the number of ENS members that predict a tropical cyclone, and each member has equal weight. The strike probability is the probability that a tropical cyclone will pass within a 300 km radius from a given location and within a time window of 48 hours. ”
https://en.wikipedia.org/wiki/Ensemble_forecasting
Scroll down in this link.
More detail here
https://windy.app/blog/ecmwf-ens-weather-forecast-model.html
Yep, ensemble forecast vs deterministic.
Thanks gents
Hi Craig,
Where did you get that screenshot from?
Here ya go..
https://charts.ecmwf.int/products/medium-tc-genesis?base_time=2023120312...
Thanks mate !
New moon tides next week. Sunny Coast is showing the tide range maxing itself out at around that 2m mark from Wednesday 13th to Saturday 16th, so likely through the peak of the swell and wind. Throw in some storm surge, and a likely a bunch of N and NE in the swell, and beach erosion could be significant. Hey Craig, which weather model does Swellnet use for its online long-term synoptics and forecasts?
That'd be GFS.
Oh no!
Lol