Simon Peatman
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View article: Joint modulation of coastal rainfall in Northeast Australia by local and large‐scale forcings
Joint modulation of coastal rainfall in Northeast Australia by local and large‐scale forcings Open
This study investigates the impact of the interaction between large‐scale and local‐scale forcings in regulating rainfall patterns and their propagation over coastal areas of Northeast (NE) Australia using a convective‐scale regional model…
View article: Large-scale to local factors influencing Sumatra squalls affecting Singapore
Large-scale to local factors influencing Sumatra squalls affecting Singapore Open
The climate of the Maritime Continent, including Singapore, is influenced by a wide range of tropical drivers including the El-Niño Southern Oscillation (ENSO), the Indian Ocean Dipole (IOD), the Madden–Julian Oscillation (MJO), and equato…
View article: Physical Controls on the Variability of Offshore Propagation of Convection From Sumatra
Physical Controls on the Variability of Offshore Propagation of Convection From Sumatra Open
Previous work has explained the physical mechanisms behind nocturnal offshore propagation of convection southwest of Sumatra. Low‐level moisture flux convergence due to the land breeze front controls the progression of convection, typicall…
View article: Large-scale to local factors influencing Sumatra squalls affecting Singapore
Large-scale to local factors influencing Sumatra squalls affecting Singapore Open
The weather and climate of the Maritime Continent, including Singapore, is influenced by a wide range of tropical drivers including the El-Niño Southern Oscillation (ENSO), the Indian Ocean Dipole (IOD), the Madden-Julian Oscillation (MJO)…
View article: Cold pool contribution to the development of convective storms over southwest Sumatra: insights from sub-km modelling
Cold pool contribution to the development of convective storms over southwest Sumatra: insights from sub-km modelling Open
The large islands of the Maritime Continent experience a strong diurnal cycle, with enhanced convection and precipitation over land through the afternoon and evening. Convective storms that initiate over land may then propagate out over su…
View article: Atmospheric Response to Mesoscale Ocean Eddies in the Maritime Continent
Atmospheric Response to Mesoscale Ocean Eddies in the Maritime Continent Open
Mesoscale ocean eddies contribute to the mixing and transport of water properties throughout the global ocean. Sea surface temperature anomalies associated with these eddies can influence atmospheric boundary layer stability, and thus the …
View article: Synoptic and Mesoscale Dynamics of Cold Surges Over the South China Sea and Their Control on Extreme Rainfall
Synoptic and Mesoscale Dynamics of Cold Surges Over the South China Sea and Their Control on Extreme Rainfall Open
We investigate the synoptic and mesoscale dynamics of two wet and two dry cold surges in January 2021 using a combination of observations, reanalysis, and convective‐scale model forecasts from the Met Office Unified Model (MetUM). We focus…
View article: Evaluation of multi-season convection-permitting atmosphere – mixed-layer ocean simulations of the Maritime Continent
Evaluation of multi-season convection-permitting atmosphere – mixed-layer ocean simulations of the Maritime Continent Open
A multi-season convection-permitting regional climate simulation of the Maritime Continent (MC) using the Met Office Unified Model (MetUM) with 2.2 km grid spacing is presented and evaluated. The simulations pioneer the use of atmosphere–o…
View article: Impact of the Madden–Julian oscillation and equatorial waves on tracked mesoscale convective systems over southeast Asia
Impact of the Madden–Julian oscillation and equatorial waves on tracked mesoscale convective systems over southeast Asia Open
Southeast Asia is a region dominated by high‐impact weather, but numerical weather prediction here is a challenge owing to the complex orography and interactions between small‐ and large‐scale phenomena. Localised mesoscale convective syst…
View article: Evaluating pySTEPS optical flow algorithms for convection nowcasting over the Maritime Continent using satellite data
Evaluating pySTEPS optical flow algorithms for convection nowcasting over the Maritime Continent using satellite data Open
The Maritime Continent (MC) regularly experiences powerful convective storms that produce intense rainfall, flooding and landslides, which numerical weather prediction models struggle to forecast. Nowcasting uses observations to make more …
View article: Comment on egusphere-2023-1404
Comment on egusphere-2023-1404 Open
Abstract. The Maritime Continent (MC) regularly experiences powerful convective storms that produce intense rainfall, flooding and landslides, which numerical weather prediction models struggle to forecast. Nowcasting uses observations to …
View article: Mid‐level dry air intrusions over the southern Maritime Continent
Mid‐level dry air intrusions over the southern Maritime Continent Open
Patterns in extreme precipitation across the Maritime Continent in southeast Asia are known to be modulated by many processes, from large‐scale modes of variability such as the Madden–Julian oscillation, to finer‐scale mechanisms such as t…
View article: Evaluation of multi-season convection permitting atmosphere - mixed layer ocean simulations of the Maritime Continent
Evaluation of multi-season convection permitting atmosphere - mixed layer ocean simulations of the Maritime Continent Open
A multi-season convection permitting regional climate simulation of the Maritime Continent using the Met Office Unified Model with 2.2-km grid spacing is presented and evaluated. The simulations pioneer the use of atmosphere-ocean coupling…
View article: Applying pySTEPS optical flow algorithms to improve convection nowcasting over the Maritime Continent
Applying pySTEPS optical flow algorithms to improve convection nowcasting over the Maritime Continent Open
The Maritime Continent (MC) regularly experiences powerful convective storms that produce intense rainfall, flooding and landslides, which numerical weather prediction models struggle to forecast. Nowcasting uses observations to make more …
View article: Wet and Dry Cold Surges Over the Maritime Continent
Wet and Dry Cold Surges Over the Maritime Continent Open
Cold surges are synoptic weather systems that occur over the Maritime Continent during the boreal winter. They are characterized by the strengthening of prevailing low‐level northerly to north‐easterly winds, temperature falls of a few deg…
View article: The Role of Density Currents and Gravity Waves in the Offshore Propagation of Convection over Sumatra
The Role of Density Currents and Gravity Waves in the Offshore Propagation of Convection over Sumatra Open
The Maritime Continent experiences some of the world’s most severe convective rainfall, with an intense diurnal cycle. A key feature is offshore propagation of convection overnight, having peaked over land during the evening. Existing hypo…
View article: Impacts of the MJO and Equatorial Waves on Tracked Mesoscale Convective Systems Over Southeast Asia
Impacts of the MJO and Equatorial Waves on Tracked Mesoscale Convective Systems Over Southeast Asia Open
Southeast Asia is a region dominated by intense convection and characterised by the high-impact weather associated with synoptic scale tropical depressions, typhoons, or tropical cyclones (TCs). However, more localised convection such as m…
View article: Physical mechanisms of offshore propagation of convection in the Maritime Continent
Physical mechanisms of offshore propagation of convection in the Maritime Continent Open
The Maritime Continent, located within the Indo-Pacific warm pool, experiences some of the most intense convective rainfall on Earth, with a pronounced diurnal cycle. The spatio-temporal variability of convection, its organisation and its …
View article: Mid-Level Dry Air Intrusions over the southern Maritime Continent
Mid-Level Dry Air Intrusions over the southern Maritime Continent Open
Patterns in extreme precipitation across the Maritime Continent in Southeast Asia are known to be modulated by many processes, from large-scale modes of variability such as the Madden-Julian Oscillation and planetary waves, to finer-scale …
View article: Wet and Dry Cold Surges over the Maritime Continent
Wet and Dry Cold Surges over the Maritime Continent Open
Cold surges are synoptic weather systems that occur over the Maritime Continent during the boreal winter. They are characterised by the strengthening of prevailing low-level northerly to north-easterly winds, temperature falls of a few deg…
View article: The Leeds Africa Climate Hackathon – experiences of running a hackathon and highlights of results
The Leeds Africa Climate Hackathon – experiences of running a hackathon and highlights of results Open
The Leeds Africa Climate Hackathon aimed to generate user-relevant narratives of possible future climate in East and West Africa relevant to hydroelectric power generation and agriculture respectively. Here we discuss how the virtual hacka…
View article: Simulations of Bay of Bengal tropical cyclones in a regional convection-permitting atmosphere–ocean coupled model
Simulations of Bay of Bengal tropical cyclones in a regional convection-permitting atmosphere–ocean coupled model Open
Tropical cyclones (TCs) in the Bay of Bengal can be extremely destructive when they make landfall in India and Bangladesh. Accurate prediction of their track and intensity is essential for disaster management. This study evaluates simulati…
View article: Forecasts of tropical cyclones in the Bay of Bengal in a regional convection-permitting atmosphere-ocean coupled model
Forecasts of tropical cyclones in the Bay of Bengal in a regional convection-permitting atmosphere-ocean coupled model Open
<p>Tropical cyclones (TCs) forming over the Bay of Bengal can cause devastation when they make landfall in India and Bangladesh; accurate prediction of their track and intensity is essential for disaster management. TC intensity is m…
View article: The influence of air–sea coupling on forecasts of the 2016 Indian summer monsoon and its intraseasonal variability
The influence of air–sea coupling on forecasts of the 2016 Indian summer monsoon and its intraseasonal variability Open
Daily initialized coupled and uncoupled numerical weather prediction (NWP) forecasts from the global Met Office Unified Model (MetUM) are compared for the 2016 Indian summer monsoon. Three MetUM configurations are used: atmosphere only (AT…
View article: Subseasonal to Decadal Prediction: Filling the Weather–Climate Gap
Subseasonal to Decadal Prediction: Filling the Weather–Climate Gap Open
* This essay stems from international conferences on subseasonal to seasonal and seasonal to decadal prediction jointly convened by WWRP and WCRP in September 2018 in Boulder, Colorado: (www.wcrp-climate.org/s2s-s2d-2018-home). Adapted fro…
View article: Current and Emerging Developments in Subseasonal to Decadal Prediction
Current and Emerging Developments in Subseasonal to Decadal Prediction Open
Weather and climate variations on subseasonal to decadal time scales can have enormous social, economic, and environmental impacts, making skillful predictions on these time scales a valuable tool for decision-makers. As such, there is a g…
View article: The Indian summer monsoon in MetUM-GOML2.0: effects of air–sea coupling and resolution
The Indian summer monsoon in MetUM-GOML2.0: effects of air–sea coupling and resolution Open
The fidelity of the simulated Indian summer monsoon is analysed in the UK Met Office Unified Model Global Ocean Mixed Layer configuration (MetUM-GOML2.0) in terms of its boreal summer mean state and propagation of the boreal summer intrase…
View article: The Indian Summer Monsoon in MetUM-GOML2.0: Effects of air-sea coupling and resolution
The Indian Summer Monsoon in MetUM-GOML2.0: Effects of air-sea coupling and resolution Open
The fidelity of the simulated Indian Summer Monsoon is analysed in the UK Met Office Unified Model Global Ocean Mixed Layer configuration (MetUM-GOML2.0), in terms of its boreal summer mean state and propagation of the Boreal Summer IntraS…
View article: Intraseasonal Variability of Air–Sea Fluxes over the Bay of Bengal during the Southwest Monsoon
Intraseasonal Variability of Air–Sea Fluxes over the Bay of Bengal during the Southwest Monsoon Open
In the Bay of Bengal (BoB), surface heat fluxes play a key role in monsoon dynamics and prediction. The accurate representation of large-scale surface fluxes is dependent on the quality of gridded reanalysis products. Meteorological and su…