SunLive – Thunderstorm and rain forecast
by rfergusonlaw.com ·
MetService has issued a severe thunderstorm watch for Hawke’s Bay. The watch is valid for eight hours from 3pm to 11pm on Saturday 20 January.
A MetService spokesperson says: “This is an alert for possible locally heavy rainfall over inland parts of Hawke’s Bay south of SH 5, and near the coast south of Hastings.”
“Between 3pm and 11pm tonight, locally heavy rain at 25-40mm per hour may affect parts of this area. These heavy rains can occur with or without thunderstorms.”
Rainfall of this intensity can cause surface and/or flash flooding, especially in low-lying areas such as streams, rivers or narrow valleys, and may also lead to slides.
Driving conditions will also be hazardous due to surface flooding and poor visibility during heavy rain.
A severe thunderstorm watch means that conditions are favorable for severe thunderstorms in and near the watch area. People in these areas should be on the lookout for hazardous weather conditions and monitor possible warnings for severe thunderstorms.
For information about preparing and staying safe during a storm, see the Civil Defense “Get Ready” website.
Heavy rain on Sunday and Monday
MetService says rainfall on the South Island’s west coast has eased, but heavy rain is expected over Gisborne/Tairawhiti on Sunday and Monday.
“The heavy rain affecting the west coast of the South Island over the past few days has eased, and all warnings and watches have now been lifted,” a MetService spokesperson says.
“On Sunday and Monday, a wet east-northeast flow is expected to impact Gisborne/Terwhiti, bringing a period of heavy rain to the area where a watch and warning are in effect.”
A heavy rain watch has been put in place for the Gisborne/Tairawhiti area south of Tolaga Bay. This is valid for 12 hours from 11pm on Sunday 21st January to 11am on Monday 22nd January.
Monday 22 January
A subtropical depression is moving south over the northeastern North Island, and warnings and alerts.
Meanwhile, the trough moves into southern New Zealand from the west.
There is high confidence that rainfall amounts will reach warning criteria for Gisborne/Tairawhiti from Tolaga Bay to the north, and moderate confidence in warning amounts for the rest of the Gisborne/Tairawhiti region and the Bay of Plenty from Whakatane to the east, as well as the Westland and Gray areas.
There is also low confidence that easterly winds will reach severe gusts around exposed parts of Gisborne/Tairawhiti. Finally, there is low confidence that northeasterly winds will rise to severe gale force around the Chatham Islands.
Tuesday 23 January
The subtropical depression continues to move away to the southeast, with low confidence in strong northeasterly storms around the Chatham Islands.
At the same time, the trough is expected to move northeastward over the rest of the country. Strong or stormy winds are likely to blow from the south to the southwest in many places after the depression, along with cold, rainy weather.
There is low confidence that rainfall amounts will reach warning criteria for Gray and Westland counties from Glacier North and Buller.
In addition, there is low confidence that southwesterly winds will rise to gale force for some time around coastal parts of Clutha and Dunedin.
Wednesday 24 January
The strong south-southwest flow over the country should retreat as a ridge of high pressure builds over the South Island.
Thursday 25 January
There is still a series of high pressure covering most parts of the country.