Afternoon Showers & Thunder, Upper North, 27th-1st.

Paul Mallinson · Unread post by **Paul Mallinson** » Sun 01/10/2006 21:30

I just checked the prog charts for tomorrow and the front is depicted over Northland at noon and over the central North Island by midnight. So you would have to think that daytime heating will help the activity on the front and also under a probable cold pool aloft behind the front and east of the low over the land in the afternoon/evening. There is usually several organised active bands of heavy showers/thunderstorms following the front and closer to the low.

Paul

NZstorm · Unread post by **NZstorm** » Sun 01/10/2006 21:30

The media in Australia and the United Kingdom also use the term 'mini tornado'. I bet it originates from the UK.

Paul Mallinson · Unread post by **Paul Mallinson** » Sun 01/10/2006 21:32

GraemeWi wrote:I got a really nice reply from the reporter from TVNZ who did the tornado report. It seems the term came from the fire crews on the scene. Anyway, if another tornado occurs hopefully we may not hear the 'mini' word

I sent her a link to the forum and a link to the wikipedia article on tornadoes.

Cheers,

G

Good stuff.

I can't abide that term mini tornado either. The same goes for a 'freak' wave at sea!

Paul

NZstorm · Unread post by **NZstorm** » Sun 01/10/2006 21:35

So you would have to think that daytime heating will help the activity

Yes, I am hoping there will be enough breaks in the cloud tomorrow to allow some good surface heating which would make things more unstable. With a moist onshore NE wind I don't know that we will see much sun but heres hoping.

spwill · Unread post by **spwill** » Sun 01/10/2006 22:17

I see a Brynderwyn weather station is showing 27.4 mm rain last hour, not sure how accurate this station is though.

Willoughby · Unread post by **Willoughby** » Sun 01/10/2006 22:43

Not as much as Auckland, but 23mm here this evening!

Well done for all the reports!

gllitz · Unread post by **gllitz** » Sun 01/10/2006 22:43

With regards to the "mini-tornado" (acccck....ptthewwy...), could it have not been a microburst from the thunderstorm that developed?:

A downburst is a severe localized wind blasting down from a thunderstorm. These strong downward currents are classified by meteorologists as microbursts if the downburst covers an area less than 2.5 miles in diameter and as macrobursts if the down burst covers an area of at least 2.5 miles in diameter.

Wind shear is any sudden change of speed or direction in wind flow. Since a microburst is a sudden vertical drop of air, it produces considerable wind shear.

source:http://netcaster.weather.com/encycloped ... rtstm.html

Based on the TV3 news report, they said it was isolated to that street, or words to that effect....thoughts?

spwill · Unread post by **spwill** » Sun 01/10/2006 22:48

could it have not been a microburst from the thunderstorm that developed?:

Yes, but it looks like a Tornado due the very very narrow damage path.

Willoughby · Unread post by **Willoughby** » Sun 01/10/2006 22:51

GFS 00z for Auckland has LI at -4C, and CAPE at 840j/Kg, 500mb temp @ -23.3Â°C at 1pm Monday.

I really want the day off tomorrow?

Manukau heads obs · Mon 02/10/2006 05:43

lots of fronts have put some of the eggs into one basket now...to the NE of northland.....BOP is in the firing line from that...
northland and auckland to only get narrow short heavy shower lines embedded in general rain (we are up to 66mm here now), this morning, but there could be a better organised front this afternoon with some heating from the sun?

NZ Weather Forum

Afternoon Showers & Thunder, Upper North, 27th-1st.

Could it have been a "microburst"?