  Using observations for two UK coastal sites <3 km from the sea, one on the
West coast near the nuclear new build (NNB) site Hinkley Point C (HPC) and the
other on the East coast, near the proposed NNB site Bradwell B (BRB), changes
in surface two-metre temperatures are analysed. The output from a numerical
model (WRF) experiment is used for a control period, 1990-1995, [Gadian et al.
2018] and for the period 2031-2036. The nested convective permitting model at a
resolution of O(3km) is driven by a global channel model at a resolution of
O(20km), enabling a more detailed comparison on the weather scale than is
available with current climate models. Further, using the RCP8.5 warming
scenario, the results are analysed. In the future scenario, there is an
increase in the number of days where the summer (JJA) model temperatures exceed
25{\deg}C. There is a future warming of 1.2{\deg}C (BRB) and 1.1{\deg}C (HPC)
in the mean JJA maximum daily temperatures compared with the control values and
an average annual maximum daily temperature warming of 1.2{\deg}C (BRB) and
0.5{\deg}C (HPC). For the control period, the model under-predicts both the
maximum and particularly the minimum temperatures. Results indicate there will
be a >25% increase in the number of summer days when the maximum temperature
exceeds 25{\deg}C, a 60% increase when the temperature exceeds the minimum of
13{\deg}C, (Tables 3, 4) and an increase in heat wave events per annum of
greater than 10 days, [Gadian et al. 2018]. The increases in summer
temperatures are larger than those predicted in the 2013 IPCC assessment
[Collins et al 2013], but consistent with the maximum temperatures and
increased number of hot days listed in UKCP18 [Met Office 2019(b)]. The higher
resolution model results suggest that the IPCC report underestimates the
increases in maximum temperatures at these locations.
