HBRC - Summer Climate Briefing
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.