the Clutha river help cool Alexandra to a certain degree,gets warmer as you get further away from the river.
For cooling affect you would need to jump in the river
A sunny afternoon with the full impact of a fohn NW right on the back of a clearing southerly and night time cooling would see a big temp range for low lying east coast locations.
I recall Timaru having a temp range of 31C in under 36hrs a few years back, low was 4C and the high 35C but the following day.
Last edited by spwill on Sat 16/10/2010 19:30, edited 1 time in total.
A place I should have remembered sooner from monthly summaries, which pretty consistently had the highest average daily range on the Met. lists: Earnscleugh, on the western side of the river, significantly further from it than the Alex. site. Its mean daily max. over a long period of records was a very slight 0.2C higher than Alex in summer months (and overall for the year), but the mean minimum was about 1.7C lower. Even so, the best it could manage from 36 years' data for a daily range was on 25/2/1972, from 0.8C to 31.0C, so a highest recorded range of 30.2C.
I see Timaru reached 26.9C today, Canterbury temperatures should fall overnight to near 0C for sheltered low lying areas, could well be atleast a 25C temperature range ( 24hrs) for some areas.
What about Big Barometer Range?
6 days ago it was 1045hPa and yesterday it was 975hPa, 'roughly' in the same area of the Tasman Sea.
A 70 hPa drop in only 6 days.
WOW
NZ Thunderstorm Soc wrote:What about Big Barometer Range?
6 days ago it was 1045hPa and yesterday it was 975hPa, 'roughly' in the same area of the Tasman Sea.
A 70 hPa drop in only 6 days.
WOW
NZ Thunderstorm Soc wrote:What about Big Barometer Range?
6 days ago it was 1045hPa and yesterday it was 975hPa, 'roughly' in the same area of the Tasman Sea.
A 70 hPa drop in only 6 days.
WOW
JohnGaul
NZThS
West Melton Storm season wont be far away now
...sorry, Ive forgotten the meaning of the word 'Storm' ???
A lot of cloud cover over Canterbury through the night with that unstable airmass slowly crossing, kept lows to around 6C so the temp range from yesterday afternoon was only about 20C.
spwill wrote:A lot of cloud cover over Canterbury through the night with that unstable airmass slowly crossing, kept lows to around 6C so the temp range from yesterday afternoon was only about 20C.
That's nice.
There was a wee bit of potential thunder today. More luck tomorrow
spwill wrote:A lot of cloud cover over Canterbury through the night with that unstable airmass slowly crossing, kept lows to around 6C so the temp range from yesterday afternoon was only about 20C.
That's nice.
There was a wee bit of potential thunder today. More luck tomorrow
JohnGaul
NZThS
A big temperature range in the upper levels very cold up there until early afternoon,was unstable despite the cool day.
Hopefully the West Melton storm season will start soon.
spwill wrote:I see Timaru reached 26.9C today, Canterbury temperatures should fall overnight to near 0C for sheltered low lying areas, could well be atleast a 25C temperature range ( 24hrs) for some areas.
Richard wrote:
How did it go spwill??did it beat my 25??
I would say you're still winning Richard but I think the biggest temp range will occur when two different airmass are involved rather than one cooling then heating.
Richard wrote:
How did it go spwill??did it beat my 25??
I would say you're still winning Richard but I think the biggest temp range will occur when two different airmass are involved rather than one cooling then heating.
In coastal regions yes, but inland areas of the SI its during periods of strong anticyclone weather in mid to late summer that the greatest temperature range occurs.
29 degrees thats a big temp range. So far this season the biggest temp range here has been 24 degrees. In november 2007 we had a temp range of 30 degrees started on -1 and reached a high of 29.
As a comparison, here in the UK, the largest diurnal ranges have occured in the Scottish Glens and in known frost hollows.
On 9th May 1978, at Tummel Bridge (Perthshire, Scotland) the temperature rose from -7.0*C to a maximun of 22.0*C, a range of exactly 29*C.
On 29th August 1936, at Rickmansworth (Hertfordshire) the temperature rose from a chillly (for a summer month) 1.1*C at dawn to 29.9*C in the afternoon, a range of 28.8*C. This frost hollow is not far from London and had a met site in the thirties and fourties, but alas no more. It is only a very shallow valley, but had a railway embankment at the lower end which acted as a dam and the cold air collected here, hence the low temperatures recorded. Many a local gardener could testify to damaging spring + summer frosts in this valley.
very cold up there until early afternoon,was unstable despite the cool day.
but I think the biggest temp range will occur when two different airmass are involved rather than one cooling then heating.
