Category Archives: Numerical modelling

Soil Moisture retrieval from satellite SAR imagery

By Keith Morrison Soil moisture retrieval from satellite synthetic aperture radar (SAR) imagery uses the knowledge that the signal reflected from a soil is related to its dielectric properties. For a given soil type, variations in dielectric are controlled solely … Continue reading

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Can observations of the ocean help predict the weather?

By Amos Lawless It has long been recognized that there are strong interactions between the atmosphere and the ocean. For example, the sea surface temperature affects what happens in the lower boundary of the atmosphere, while heat, momentum and moisture … Continue reading

Posted in Boundary layer, data assimilation, Numerical modelling, Oceans, Weather forecasting | Leave a comment

Why has there been a rapid increase in heat-related extremes in Western Europe since the mid-1990s?

By Buwen Dong In the last few decades, Europe has warmed not only faster than the global average, but also faster than expected from anthropogenic greenhouse gas increases (van Oldenborgh et al., 2009). With the warming, Europe experienced record-breaking heat … Continue reading

Posted in Aerosols, Atmospheric chemistry, Climate, Climate change, Climate modelling, Environmental hazards, Numerical modelling | Leave a comment

The physics behind a physics scheme

By Alan Grant When I joined the Met Office (or, as it was then, The Meteorological Office), I was posted to the boundary layer group. I spent a number of years investigating the atmospheric boundary layer, using data from aircraft … Continue reading

Posted in Boundary layer, Environmental physics, Numerical modelling, Oceans, Waves | Leave a comment

Changing wet and dry seasons

By Richard Allan The fickle nature of weather patterns is ultimately responsible for the where and when of tropical rainfall extremes which wreak damage on agriculture, infrastructure and people. Tropical cyclones, such as Enawo which battered Madagascar in March, can … Continue reading

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Water vapour transport by tropical cyclones over East Asia

By Liang Guo When talking about tropical cyclones (TCs), people tend to think about gusty winds and heavy rain. These weather phenomena impress us due to the immense impacts on our surroundings. However, these weather phenomena are short-lived. Most TCs … Continue reading

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Nice weather, atmospheric blocking and forecasts

By Oscar Martinez-Alvarado With the beginning of spring (either the ‘meteorological’ spring on 1 March or the ‘astronomical’ spring on 20 March, as the Met Office explains here), the UK and indeed the whole Northern Hemisphere start experiencing warmer weather. The … Continue reading

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Observation uncertainty in data assimilation

By Sarah Dance Approximately 4 million properties in the UK are at risk from surface-water flooding which occurs when heavy rainfall overwhelms the drainage capacity of the local area. Several national weather centres have been developing new numerical forecasting systems … Continue reading

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An update on the North Atlantic cold blob (January 2017)

by Pablo Ortega One of the most remarkable climate events in the last two years has been an exceptional cooling in the eastern sub-polar North Atlantic (ESPNA, Figure 1), commonly referred to as “the cold blob”. Occurring while the planet … Continue reading

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HEPEX: a community of research and practice to advance hydrologic ensemble prediction

By Hannah Cloke Although formal funded societies and projects can be very important in advancing research and improving how science is used, the unfunded voluntary community initiative of HEPEX has been one of the most important networks that I have … Continue reading

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