Key Takeaways
- A large low-pressure system is moving across the North Island and the top of the South Island, bringing heavy rain, localized downpours, and thunderstorms.
- A severe thunderstorm watch has been issued for several regions, including Northland, Great Barrier Island, Coromandel Peninsula, Gisborne, Hawke’s Bay, Taihape, Wanganui, Manawatū, Tararua, and Wairarapa.
- Orange heavy rain warnings and watches are in effect for many parts of the country, with downpours potentially reaching 120mm/h in some areas.
- Residents are advised to clear drains and gutters, avoid low-lying areas, and drive cautiously due to the risk of surface flooding, slips, and difficult driving conditions.
Introduction to the Weather Forecast
MetService has issued a warning for a "thundery Thursday" as a large low-pressure system moves across the North Island and the top of the South Island, bringing heavy rain, localized downpours, and thunderstorms. The system has been upgraded to include more areas across the entire North Island, with watches and warnings already in place. The forecaster has issued a severe thunderstorm watch for several regions, including Northland, Great Barrier Island, Coromandel Peninsula, Gisborne, Hawke’s Bay, Taihape, Wanganui, Manawatū, Tararua, and Wairarapa, effective from today into Friday.
Severe Thunderstorm Watch and Heavy Rain Warnings
The severe thunderstorm watch is in effect due to a moist unstable northwesterly flow that is expected to bring frequent showers and possible thunderstorms to the affected regions. There is a moderate risk of severe thunderstorms with downpours bringing localized rainfall rates of 25 to 40 mm/h. Orange heavy rain warnings and watches are still in effect for many parts of the country, including the top of the South Island, where downpours could reach a maximum of 120mm/h. The heavy rain warnings and watches are in place to alert residents of the potential for surface flooding, slips, and difficult driving conditions.
Meteorologist Insights
MetService meteorologist Katie Lyons explained that while lightning strikes may be exciting, the forecaster is "really focused" on the "double-whammy" element of localized heavy rain falls and high hourly rates. Lyons said that the combination of high hourly rates and broad-scale heavy rain for a prolonged period of time is of particular concern. She also noted that lightning strikes were confined to the west overnight, but are expected to move over the country as the day progresses. The risk areas for thunderstorms are mainly in the northern half of the North Island for the morning, and will flow through to the southern half of the North Island for the afternoon and evening.
Regional Weather Forecast
The severe thunderstorm watch and heavy rain warnings are in effect for various regions, including Northland, Great Barrier Island, Coromandel Peninsula, Gisborne, Hawke’s Bay, Taihape, Wanganui, Manawatū, Tararua, and Wairarapa. The watch is in effect for 13 hours from 11am to midnight tonight for Northland, and 17 hours from 1pm today for Great Barrier Island and Coromandel Peninsula. The heavy rain warning is in effect for 25 hours from 9am today for Bay of Plenty and Rotorua, and 19 hours from 8pm Wednesday for Marlborough about and north of Ward.
Preparation and Safety
Residents are advised to take necessary precautions to prepare for the heavy rain and potential flooding. This includes clearing drains and gutters, avoiding low-lying areas, and driving cautiously due to the risk of surface flooding, slips, and difficult driving conditions. The rain is expected to ease from the west on Friday morning, but until then, residents should remain vigilant and stay up to date with the latest weather forecast and warnings.
Conclusion
In conclusion, the weather forecast for Thursday is looking ominous, with a large low-pressure system moving across the North Island and the top of the South Island, bringing heavy rain, localized downpours, and thunderstorms. Residents are advised to take necessary precautions to prepare for the heavy rain and potential flooding, and to stay up to date with the latest weather forecast and warnings. The severe thunderstorm watch and heavy rain warnings are in effect for various regions, and residents should remain vigilant and cautious throughout the day.