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on the Met Office website and the 8 weather patterns are displayed in Figure 1. This document can be cited as: McSweeney, C. and Thornton, H. (2020) UKCP European Circulation Indices: Weather Patterns. UKCP Factsheet. Met Office. References Kendon, M., Sexton, S. and McCarthy, M. (2020) 20 °C in the UK

system. References Migliorini, S., and Candy, B. (2018), All-sky satellite data assimilation of microwave temperature sounding channels at the Met Office. Q.J.R. Meteorol. Soc., under revision. Migliorini, S., Lorenc, A. C. and Bell, W. (2018), A moisture-incrementing operator for the assimilation of humidity- and cloud-sensitive observations: formulation and preliminary results. Q.J.R. Meteorol. Soc.. doi:10.1002/qj.3216

the planning steps, and this phase is about revisiting and compiling these in a robust framework, rather than about generating new content and ideas. Step 1.1 Select and define the area(s) of transformation: The area(s) of transformation will guide data collection and help narrow down the types

the following is an an example of the XML that would be returned <Rep D="ENE" P="1016" S="8" T="13.8" V="23000" W="7">780</Rep> For sites that do not have all the parameters available, the following is an example of the XML that would be returned <Rep D="N" S="3" T="11.5">0</Rep> UK hourly site-specific observations

• C-band to S-band wavelength • Magnetron to klystron transmitter • Conventional (Doppler) to polarimetry • In-house integration to commercial off-the-shelf (COTS) hardware solution • Change of industrial vendor • New data representation (file formats) Applications: from largely qualitative

for both the daily maximum and minimum average temperatures.   Northern Ireland had its joint-warmest September on record, with mean temperatures of 14.2°C matching 2006’s figure, in part because of some record breaking warm nights. Northern Ireland recorded their highest average minimum temperatures

mm - 1988 England S 121.7 228 2 134.1 mm - 1936 England E & NE 113.8 194 6 156.6 mm - 1940 England NW & Wales N 175.3 203 3 196.1 mm - 1939 Midlands 144.8 256 1 135.6 mm - 1915 East Anglia 74.3 147 Not significant 115.6 mm - 1936 England SW & Wales S 164.5 230 3 204.9 mm - 1939 England SE & central

The UK had its joint-warmest September on record in a series which goes back to 1884 according to provisional Met Office statistics. The UK’s September 2023 mean temperature of 15.2°C puts it level with 2006’s record figure in statistics that have been ‘substantially influenced’ by the impact

ensemble seasonal forecast for the next six months is generated by combining and bias correcting all forecast members available from the most recent three weeks.   References: Harada, Y., Kamahori, H., Kobayashi, C., Endo, H., Kobayashi, S., Ota, Y., Onoda, H., Onogi, K., Miyaoka, K., & Takahashi, K

and CDF plots for UK on the UKCP18 User Interface. The full dataset is available from the CEDA Data Catalogue: note that this requires familiarity with handling large datasets. References Lowe JA, Bernie D, Bett PE, Bricheno L, Brown S, Calvert D, Clark RT, Eagle KE, Edwards T, Fosser G, Fung F