MetService says severe thunderstorms have eased in Southland after earlier issuing warnings for parts of the region.
The forecaster issued two severe thunderstorm warnings earlier in the evening, for several areas including around Dipton, Winton, Hokonui Hills and Hedgehope.
A MetService spokesman said the thunderstorms were expected to be accompanied by torrential rain and hail.
In an update just before 8pm MetService said thunderstorms were still present in the Southland area, but none was severe.
A severe thunderstorm watch remained in force for Central Otago, Clutha and Southland.
MetService meteorologist John Law earlier said the "unsettled" weather was being caused by the same weather pattern that was causing flooding and mayhem in the North Island.
"Essentially what’s driving the thunderstorms in the southern region is daytime convection.
"We’ve got those very warm temperatures, we’ve got all this moisture in the air making it very muggy, so you’ve got all those elements that you need to spark off some of those thunderstorms.
"Most of them could be severe and perhaps have that risk of downpours towards the afternoon and evening."
Some of these thunderstorms might produce localised downpours of 25mmh to 40mmh and hail, and could cause surface or flash flooding about low-lying areas such as streams, rivers and narrow valleys.
MetService earlier issued a severe thunderstorm watch for Canterbury High Country, Central Otago, Clutha and Southland for the period of 2pm until 9pm today.
The watch stated scattered heavy showers and a moderate risk of thunderstorms could be expected for the regions.
People should avoid outdoor activities, particularly after a dozen sheep were killed instantly earlier this month when a nearby tree was struck by lightning, Mr Law said.
"Just be aware that if you’re outside, the best place to be during a thunderstorm is inside.
"Stay away from trees. They will attract lightning strikes."
Similar weather conditions were expected to hit inland areas of the region on Thursday.
"We’ve got that same air mass over us and still very warm temperatures, so it’s worth keeping a close eye on the forecast.
"We’re getting more and more information as we get closer to the event."
The National Emergency Management Agency advises that as storms approach you should:
- Take shelter, preferably indoors away from windows;
- Avoid sheltering under trees, if outside;
- Get back to land, if outdoors on the water;
- Move cars under cover or away from trees;
- Secure any loose objects around your property;
- Check that drains and gutters are clear;
- Be ready to slow down or stop, if driving.
During and after the storm, you should also:
- Beware of fallen trees and power lines;
- Avoid streams and drains as you may be swept away in flash flooding.
