MetSim (Meteorology Simulator)

MetSim is a meteorological simulator and forcing disaggregator for hydrologic modeling and climate applications. Metsim is based on MtClim and the preprocessor from version 4 of the VIC hydrologic model.




Initial contribute: 2019-10-16


UW Hydro | Computational Hydrology
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Method-focused categoriesProcess-perspectivePhysical process calculation

Detailed Description

English {{currentDetailLanguage}} English

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MetSim consists of 3 main modules that govern the operation of 3 major aspects of its operation:

1. Management of dataset preprocessing and IO

The MetSim object provides high level support for setting up jobs and infrastructure for running simulation/disaggregation steps. It is the main interface through which the other modules are accessed.

2. Simulation of daily meteorological forcings

The base implementation of the meteorological simulator is based off of the algorithms described in[1]. This component has been designed to be flexible in allowing for alternative implementations which may be specified during the setup of the MetSim object. The default implementation allows for the daily simulation of:

  • Mean daily temperature
  • Incoming shortwave radiation
  • Cloud cover fraction
  • Potential evapotranspiration
  • Vapor pressure

For the "triangle" and "mix" methods of precipitation disaggregation, doumentation can be found here. This will eventually be superceded by a journal article that is currently in review [7].

3. Disaggregation of daily simulation values to sub-daily timesteps

Daily data from given input or simulated via the forcings generation component of MetSim can be disaggregated down to sub-daily values at intervals specified in minutes (provided they divide evenly into 24 hours). The operation of these algorithms is also described in [1]. The variables estimated are:

  • Temperature
  • Vapor pressure
  • Relative and specific humidity
  • Air pressure
  • Cloud cover fraction
  • Longwave radiation
  • Shortwave radiation
  • Precipitation
  • Wind speed

Getting Started

A tutorial for running MetSim and working with input/output data can be run via binder here:



MetSim group (2019). MetSim (Meteorology Simulator), Model Item, OpenGMS,


Initial contribute : 2019-10-16



UW Hydro | Computational Hydrology
Is authorship not correct? Feed back

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