MetService New Zealand has issued a Severe Thunderstorm Watch for parts of the Tasman District from 2pm to 7pm today.
An unstable front is expected to bring heavy showers, hail and thunderstorms. A few of these thunderstorms may become severe, producing large hail in excess of 2 cm in diameter or significant hail accumulations. Large hail can cause significant damage to crops, orchards, vines, glasshouses and vehicles, as well as make driving conditions hazardous.
Keep up to date with the latest MetService warnings here(external link).
If you're going to be on the roads during this time, it's a good idea to check the road conditions before travelling. Any relevant roading information can be found on this page.