Ex-tropical storm & heavy rain, Jan 31st to Feb 3

[Nathanaelcraven]

Got 30 mm here from around midnight also was very heavy early thismorning for about an hour. A mix of torrential drizzle and big drops also. We don't often get that in Canterbury what causes that? High humidity levels? Probably standard for you guys up north.

[jamie]

This ex cyclone is still hanging on. The radar looks awesome. It’s like a pin sized tropical cyclone.

[NZstorm]

That vortex looks interesting on radar. We end up with instability today and tomorrow. Upper air will be relatively cold with 500mb cooling off to -17C and surface dps 16C.

Maybe some nightime lightning over Hauraki Gulf/North Auckland overnight tonight given warm sea temps as well.

[NZstorm]

Just add that it would be more favourable if the rain out to the west stayed out at sea. We want the sun out today for some locally grown convection.

[Thunder081]

Wow haven't seen a small spinning low with red in it before!!

[David]

Feeling chilly given how warm it's been recently. Only 18C currently!

[spwill]

Keeping watch for a possible thunderstorm in the Auckland area this afternoon

[David]

Doesn't seem as deep as EC showed it to be? Looks like it's crossing the Auckland area now and pressure is still 1004hPa, not in the 990s...

[spwill]

Metservice has Waitakere warmer on 24C currently, some convergence will occur over Ak region this afternoon.

[NZstorm]

A mix of torrential drizzle and big drops also. We don't often get that in Canterbury what causes that?

Likely two different cloud types precipitating. Drizzle comes from thick stratus. Bigger drops from nimostratus which typically has a higher base.

[GraemeWi]

Here in Swanson, there is a couple of mature anvils off to the north, and a great looking lump of cloud to the south where the low is. Some good heating going on at the moment.

Edit - really weird now, you can see clouds converging from the north and east into it.Wind has picked up here, dark to the south

[spwill]

It has been a quite sunny afternoon north of the Manakau harbour but cloudy with some rain to the south.

[GraemeWi]

The wind is really picking up here, 63kph gust. Hope the neighbour's trampoline is secure if it keeps on increasing!

Edit - 74kph gust, close lightning

[spwill]

A Thunderstorm showing over the Watakere ranges last 20min.

[spwill]

Distant thunder here last 10mins, Greylynn tracker looks busy

[Demchy]

Thunder and heavy rain at Titirangi for the last 10 minutes, thunder elevated.

[David]

Weather station in Waitakere showing 34mm last hour

[GraemeWi]

I've had 29.6mm in the last hour, wouldn't be surprised if there was local flooding around the west Auckland area.

[David]

Some very heavy rain in Howick last 15 mins.

[NZstorm]

I went for a drive out to Waitakere. Apart from a few flashes I didn't see much as the storm was a rainy mess. Torrential rain encountered. Lots of static on the am band, it would have been mostly IC.

[David]

19mm here in the last hour now.

[NZ Thunderstorm Soc]

Apart from a few flashes I didn't see much as the storm was a rainy mess. Lots of static on the am band, it would have been mostly IC.

Sounds similar to the thunderstorms we have had down here from off the 4 Peaks/Mt. Peel area.

[GraemeWi]

News of a couple of people swept away in the Cascades (Waitakere ranges), emergency services searching the Waitakere river

[Orion]

https://www.stuff.co.nz/auckland/101154 ... waitakeres

Sad news.

[NZstorm]

Sads news. There is a PWS in the area which collected 40mm in an hour (Mountain Road). The ground was wet from the Thursdays rain so todays thunderstorm would have produced excessive run off.

Radar showed the storm was most intense near Piha, would be interesting if there was a rain measurement from that area.