Joint Centre for Mesoscale Meteorology (JCMM)

What is JCMM?

The Joint Centre for Mesoscale Meteorology (JCMM) is a collaborative research centre involving some of the staff of the Department of Meteorology at the University of Reading and a unit of the Met. Office's Numerical Weather Prediction Division located together in the Meteorology Building at the University of Reading.

The aim of JCMM

The aim of JCMM is to develop the insights into mesoscale processes that are necessary for improvements in the prediction of climate, weather, local circulations and their effects. The Met. Office unit also aims to apply these insights in the diagnosis and development of weather prediction techniques.

JCMM pursues its research aim through a combination of observational, modelling and theoretical studies, by exploiting the complementary skills of staff and facilities available from a university and a national weather service.

What is mesoscale meteorology?

Mesoscale meteorology is the science of local and regional atmospheric phenomena. These phenomena include individual storms, fronts, convective clouds and boundary-layer circulations, including topographical effects. Mesoscale systems interact strongly with microscale processes at scales of order a kilometre or less and with the large-scale global circulation. These interactions are also part of JCMM's remit.

Research approaches used by JCMM


  • Ground-based radar measurements and interpretation
  • Interpretation of satellite measurements
  • Interpretation of airborne measurements
  • Ground-based microphysical and pollution measurements
  • Mesoscale analysis techniques


  • Numerical model formulation using modern theoretical concepts
  • Diagnostic studies using high-resolution numerical weather prediction models, especially the Met. Office's Unified Model
  • Very-small-scale numerical modelling with explicit representation of physical processes
  • Theoretical modelling
  • Conceptual (descriptive/physical) modelling

JCMM Research Links


  • to Met. Office Groups concerned with weather and climate research and prediction
  • to the Department of Meteorology, and through it to groups at the University of Reading such as the Environmental Science Systems Centre, the Departments of Mathematics, Soil Science and Chemistry, and to the Institute of Hydrology (which is associated with the University)
  • through the Universities Weather Research Network (UWERN), to other universities and research groups with common interests


  • through the involvement of its staff in many collaborative ventures with groups in Europe and North America, and more widely through the research programmes of the World Meteorological Organization

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