Summer Climate Briefing
Hawke’s Bay Regional Council environmental scientists gave a climate briefing today to a group of interested people.
The full briefing is available to watch here https://youtu.be/3RMnQZUAeV8
Climate – HBRC Climate Scientist Dr Kathleen Kozyniak
There was ample rain in the north in December, but it was drier than usual elsewhere. January has started well with all
ranges, northern parts of the region and CHB already hitting the January average.
Soil moisture is near or above average in most areas, though possibly drier than usual around the south coast.
Hawke’s Bay has a weak La Niña for summer, which is expected to transition to neutral conditions in autumn. Climate
models favour an east to northeast flow over the country for the remainder of summer due to a pattern of highs to the
southeast and lower than usual pressures to the north and in the Tasman Sea. That raises the chance of higher than
normal rainfall for Hawke’s Bay or at least decreases the risk of below normal rainfall.
Groundwater – HBRC Groundwater Scientist Simon Harper
Groundwater levels in early November were measuring near normal levels. By early December, groundwater levels had
sharply declined in both the Heretaunga and Ruataniwha Plains. For December, groundwater levels on the Heretaunga Plains
measured a mix of normal and below normal conditions. Typically, below normal groundwater levels cluster in the
unconfined area west of Fernhill but for December these conditions were also observed in wells located over the confined
area. On the Ruataniwha Plains groundwater levels measured a mix of normal, below normal and lowest-ever December
groundwater levels. These conditions were spread across the Ruataniwha Plains.
Our telemetered sites show groundwater levels rose between mid-December and mid-January. Our January groundwater levels
are scheduled to be measured in late January. We anticipate an increase in normal conditions for this month in response
to the rainfall received between mid-December and mid-January.
River Flows – HBRC Hydrologist Rob Waldron
River flows across all sites in the region during December 2017 were either below or close to normal. Meanwhile this
month, provisional figures show river flows across most sites in the region are above or close to normal, with the
exception of river flows in the Southern Coastal and Porangahau areas, which below normal.