Goodbye rain, hello sunshine

Manukau heads obs · Tue 25/10/2005 19:58

you could see the cloud base was much higher today...
a settled day in the end around here at least...
2 days are never the same in auckland!

GraemeWi · Unread post by **GraemeWi** » Tue 25/10/2005 20:06

Right on sunset there was a tasty cu buildup off to my north - what a shame it didn't fire a couple of hours earlier!

Cheers,

G

ricky · Unread post by **ricky** » Tue 25/10/2005 20:47

DP of 10+ could've cracked that cap today by the look of it... was almost there for a short time while things were getting warmed up but then dried up a bit...

spike_01 · Unread post by **spike_01** » Tue 25/10/2005 21:08

Wall to wall blue here for 3 days... Been sunburnt while whitebaiting...

NZ Thunderstorm Soc · Tue 25/10/2005 21:32

JohnGaul
NZTS

Same here just about

Real photo-synthesis sunshine since Labour WE.
Easterly a bit cool today in the sunshine.

squid · Unread post by **squid** » Wed 26/10/2005 08:44

had 13mm of rain in 30 mins between 4 and 4 30 pm yesterday afternoon form a slow moving heavy shower unexpected but still nice

Willoughby · Unread post by **Willoughby** » Wed 26/10/2005 10:52

Cu starting to tower this morning, more than yesterday where sea level pressure was 1025mb, 1030mb at the moment with a dewpoint of 12c, temp 17c with light variable winds, 3/8

Cap is weak and undefined, lower and higher atmosphere stable.
Though TS risk is higher than yesterday's, still minimal.

People starting to get wickedly sunburnt

squid · Unread post by **squid** » Wed 26/10/2005 11:03

the same thing is happening up here foggy Ts when the baro is this high???

Manukau heads obs · Wed 26/10/2005 13:09

yes some good towering cumulus around here too at times
and yup that sun is strong alright!
because its lower in the sky, more of your body is exposed to it, rather than more overhead in the peak of summer....just my thinking anyway

Willoughby · Unread post by **Willoughby** » Wed 26/10/2005 15:18

squid wrote:the same thing is happening up here foggy Ts when the baro is this high???

Yes, often it can happen. But not today.
People can take high pressure systems for granted and just assume it's fine sunny weather. As we all know it's a good producer of drizzle, but it can create thunderstorms if there is enough instability aloft,.. and also gales.

NZstorm · Unread post by **NZstorm** » Wed 26/10/2005 16:58

had 13mm of rain in 30 mins between 4 and 4 30 pm yesterday afternoon

There was isolated low topped cb's about yesterday. Tops to about 3500m. We never got one in Auckland but I could see them over Northland and in the Coromandal.

Cap is weak and undefined, lower and higher atmosphere stable.
Though TS risk is higher than yesterday's, still minimal.

With current state of atmosphere, we need dewpoints to be about 14-15C for deep convection. I expect dewpoints to slowly rise in the next few days but upper atmosphere will get warmer too, hence staying stable for now.

NZ Thunderstorm Soc · Wed 26/10/2005 17:36

JohnGaul
NZTS

Thunderstorms do occur in times of high pressure but not very often. A bolt of lightning did drop down from a cloud over New Brighton beach a couple of years ago in anticyclonic conditions - cant remember the date.
In Erick Brenstrum's NZ Weather book he mentions about thunderstorms in high pressure/anticyclonic conditions.

tich · Unread post by **tich** » Wed 26/10/2005 17:58

Thunderstorms do occur in times of high pressure but not very often.

Probably during a spell of very warm weather in mid or late summer, when afternoon convection about elevated inland areas is accentuated. February 1990 springs to mind as an example.

NZstorm · Unread post by **NZstorm** » Wed 26/10/2005 18:26

Thunderstorms do occur in times of high pressure but not very often

Depends what you define as high pressure. Thunderstorms with a barometer reading of 1020hpa are not unusual over the North Island but at 1030hpa would be extremely unusual.

squid · Unread post by **squid** » Wed 26/10/2005 20:37

thanks guys for clearing that up for me a fine boring day 2day boring few days

NZ Thunderstorm Soc · Wed 26/10/2005 21:02

NZstorm wrote:
Depends what you define as high pressure. Thunderstorms with a barometer reading of 1020hpa are not unusual over the North Island but at 1030hpa would be extremely unusual.

It is the 1030hPa range I was referring too.
Quite often here in ChCh you get what I call the "1030Scenario" espcially after a southerly has gone through and a ridge is building in behind, with pressures building up to 1030hPa.
Quite often you get strong Cu clouds some even coming up to congestus stage

RWood · Unread post by **RWood** » Wed 26/10/2005 22:28

This oldish article from a NZ Geographic series is a good description of the "bag of tricks" available in anticyclonic conditions.

http://www.metservice.co.nz/default/ind ... key=192949

In addition it could be noted that land heating and redistribution effects near the end of a hot summer day under cloudfree skies can produce quite strong winds at various places in (eg) the Cant'y - Otago hinterland - I often encountered these at certain recognisable (after a number of trips) points when travelling between Alexandra and Ch'ch. Some of these locations were not as obvious as the Clutha valley effect south of Alexandra.

Willoughby · Unread post by **Willoughby** » Thu 27/10/2005 14:42

Few clouds and warm across the basin today, 23c at the moment.

I notice Dunedin Airport is on 25c at 1pm, who could imagine what Alexandra is on?

Was 27c there yesterday.. quite hot for October

Guess it's global warming..

ricky · Unread post by **ricky** » Thu 27/10/2005 14:56

The Stronger NE breeze has kept the temperature in control a bit over 20deg here today, pretty much blue dome stuff now.. very nice

tich · Unread post by **tich** » Thu 27/10/2005 17:10

Warm too in Chch today, with temps up around 25C. First real summery day for this season, after what's been a rather chilly month so far.

RWood · Unread post by **RWood** » Thu 27/10/2005 18:27

Today's sun will bring us close to the 200hr mark with a few days left.
The August-Oct "season" here would be the best since 1987.

The 30-day SOI is racing "upwards" at present and is now +11.20 but if the consensus of models is right then no Nina or Nino is expected to mature in the next few months.

NZstorm · Unread post by **NZstorm** » Thu 27/10/2005 18:50

Yes, Wellington does look like its going to be the sunniest region in the country for October. Driest Otago, wettest Bay of Plenty, warmest Auckland. Thats my pick.

Manukau heads obs · Thu 27/10/2005 19:51

month to date temperature for here is 14oC, 0.4oC less than the average for Oct, but with warm (for this time of year) weather to continue, should end up being average for the month (the first 10 days were colder )

see:
http://www.weather-display.com/windy/gb ... ntrend.gif

for the temperature rise occuring

Fujita Phil · Unread post by **Fujita Phil** » Thu 27/10/2005 21:50

24.8C here today. Temp in the glasshouse was off the scale

NZ Thunderstorm Soc · Thu 27/10/2005 22:56

JohnGaul
NZTS

I noticed on the telly today that Dunedin was the country's max.
Would that be the airport or Musselborough?
26c it was.
I got up to 25.1C