Storms NE SI & Eastern NI 12/12/2016
Posted: Mon 12/12/2016 09:29
Valid to: Midnight Monday 12 Dec 2016
Issued at: 9:11am Monday 12 Dec 2016
A trough is crossing the north of the North Island this morning. A front over northern Canterbury is expected to move onto the southern North Island around midday and reach Gisborne this evening.
There is a low risk of thunderstorms over Northland and northern Auckland this morning associated with the trough.
There is a moderate risk of thunderstorms associated with the front for northern Canterbury and the Kaikoura Coast this morning, Wellington, Kapiti, eastern Manawatu, Wairarapa and coastal Central Hawkes Bay this afternoon. These thunderstorms may bring localised heavy rain with intensities of 10 to 25mm per hour and hail of 5 to 20mm diameter. For the Kaikoura Coast and Wellington there is also the possibility of strong wind gusts of around 90 km/h. About the Canterbury Foothills and Kaikoura the moderate risk of thunderstorms continues into the afternoon. About northern Wairarapa there is also a low risk that one or two thunderstorms could be SEVERE with downpours of 25 to 35mm per hour and large hail.
About Gisborne, northern Hawkes Bay and inland Central Hawkes Bay sea breezes and afternoon heating are likely to create convection before the front arrives. There is a moderate risk of thunderstorms in these areas during the afternoon and evening. These thunderstorms could have localised heavy rain with intensities of 10 to 25mm per hour and hail of 5 to 20mm in diameter.
Cold air aloft is expected to move over the north of the South Island during the afternoon and for much of Marlborough away from the Kaikoura Coast and eastern Nelson there is a high risk of thunderstorms and a moderate risk that some may be SEVERE. The thunderstorms are likely to be accompanied by localised heavy rain and hail, with downpours of 25 to 35mm per hour and large hail in SEVERE thunderstorms.
Outside these moderate and high risk areas there is a low risk of thunderstorms as shown on the chart.
Issued at: 9:11am Monday 12 Dec 2016
A trough is crossing the north of the North Island this morning. A front over northern Canterbury is expected to move onto the southern North Island around midday and reach Gisborne this evening.
There is a low risk of thunderstorms over Northland and northern Auckland this morning associated with the trough.
There is a moderate risk of thunderstorms associated with the front for northern Canterbury and the Kaikoura Coast this morning, Wellington, Kapiti, eastern Manawatu, Wairarapa and coastal Central Hawkes Bay this afternoon. These thunderstorms may bring localised heavy rain with intensities of 10 to 25mm per hour and hail of 5 to 20mm diameter. For the Kaikoura Coast and Wellington there is also the possibility of strong wind gusts of around 90 km/h. About the Canterbury Foothills and Kaikoura the moderate risk of thunderstorms continues into the afternoon. About northern Wairarapa there is also a low risk that one or two thunderstorms could be SEVERE with downpours of 25 to 35mm per hour and large hail.
About Gisborne, northern Hawkes Bay and inland Central Hawkes Bay sea breezes and afternoon heating are likely to create convection before the front arrives. There is a moderate risk of thunderstorms in these areas during the afternoon and evening. These thunderstorms could have localised heavy rain with intensities of 10 to 25mm per hour and hail of 5 to 20mm in diameter.
Cold air aloft is expected to move over the north of the South Island during the afternoon and for much of Marlborough away from the Kaikoura Coast and eastern Nelson there is a high risk of thunderstorms and a moderate risk that some may be SEVERE. The thunderstorms are likely to be accompanied by localised heavy rain and hail, with downpours of 25 to 35mm per hour and large hail in SEVERE thunderstorms.
Outside these moderate and high risk areas there is a low risk of thunderstorms as shown on the chart.
0.6mm here, nothing this morning......so far
