Goodbye rain, hello sunshine
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These topics are a read-only archive and may be subject to out-of-date information.
For today's weather discussion head to: New Zealand Weather & Climate
These topics are a read-only archive and may be subject to out-of-date information.
For today's weather discussion head to: New Zealand Weather & Climate
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- Willoughby
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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
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
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Yes, often it can happen. But not today.squid wrote:the same thing is happening up here foggy Ts when the baro is this high???
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.
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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.had 13mm of rain in 30 mins between 4 and 4 30 pm yesterday afternoon
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.Cap is weak and undefined, lower and higher atmosphere stable.
Though TS risk is higher than yesterday's, still minimal.
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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.
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.
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It is the 1030hPa range I was referring too.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.
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
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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.
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
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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.
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.
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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
see:
http://www.weather-display.com/windy/gb ... ntrend.gif
for the temperature rise occuring
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24.8C here today. Temp in the glasshouse was off the scale
There is no such thing as bad weather, just the wrong clothes.
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