Simon Lee

@simonleewx.com

4743 Followers 878 Following

Lecturer in Atmospheric Science, University of St Andrews. Large-scale dynamics of the atmosphere and its role in weather and climate variability, predictability and change. FRMetS. simonleewx.com

EGU welcome banner
Screenshot of abstract for "Recent summertime North American weather regime trends in a very large seasonal model ensemble"
Blue skies over St Mary’s Quad with blossom
Stacked bar chart showing probabilities of four weather regimes (positive NAO, Atlantic Ridge, negative NAO and Scandi Blocking) plus No Regime
Chris White introducing the ANTICIPATE COST Action on extended-range multi-hazard predictions and early warnings
Staff and students on the summit of Helvellyn
Thirlmere Reservoir on an overcast day in June 2025 looking toward Helvellyn
Join us for the RMetS Annual Weather and Climate Conference! The conference will provide a platform for scientists and operational meteorologists working in academia, public and private sectors to present their work to the weather and climate community, with dedicated sessions to showcase early career researchers and early career professionals, alongside RMetS Award winners and keynote speakers. Call for Papers: Abstract submission has now been extended until Friday 6th March.
Sunny skies over St Andrews Bay
PT = Pacific Trough, PR = Pacific Ridge, AKR = Alaskan Ridge, GH = Greenland High, NO = No Regime Bars show the proportion of ensemble members assigned to each regime. Squares across the top show the attribution of the ensemble mean, which often tends toward No Regime at long lead-times.
ERA5 time series of daily-mean zonal mean zonal winds at 10 hPa 60°N for 2025/26 so far
A time series of the January–February frequency (in days) of the AKR regime from 1979 to 2025 using ERA5 data, based on the year-round classification of Lee et al. 2023 (J. Climate) updated through 2025.
Screenshot of a Yellow weather warning for rain over eastern Scotland
Screenshot of part of our paper "Increasing Frequency and Persistence of the Summertime Greenland High Regime Not Captured by a Seasonal Prediction Model Very Large Ensemble" in GRL
ECMWF IFS stratospheric wave reflection index ensemble forecast from 7 Jan 2026 showing a forthcoming reflection event
Met Office surface pressure and frontal analysis for 12Z 8 January 2026
Weather Regime Index time series for 2025, with the assigned regimes marked. Any days not marked are No Regime.
Composite-mean normalised 500 hPa geopotential height anomalies for the four North American weather regimes: Pacific Trough, Pacific Ridge, Greenland High and Alaskan Ridge. The remaining 14% of days are classified as No Regime.
Waves breaking onto the beach at East Sands, St Andrews, under a pastel-coloured winter sky at sunset
A significantly empty Thruscross with lots of exposed rocks normally underwater
Looking along St Andrews Pier to the cathedral ruins, flanked by blue waters underneath blue skies.