How KNMI meteorologists work with meteorological information systems

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How KNMI meteorologists work with meteorological
information systems
Jos Diepeveen forecaster Central Weather room De
Bilt
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Overview

• Weather room
• Different types of forecasts/forecasters
• Example of 2 types of forecasts with a link to
  GIS.
• Short demonstration of Meteorological Workstation

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General forecaster Maritime forecasterAviation
forecaster
Central weather room De Bilt
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Forecasts have different scales in time and space

• 0-18 hrs ? NOWCASTING
• 18-48 hrs ? Short term Forecasting
• 48-240 hrs ? Long term forecasting

Working methods and added value of forecaster is
very dependent of timescale.
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Long term forecasting (48-240 hrs)

• Looking at large scale flow patterns
• Forecast to ten days at 40 km resolution
  (high-resolution model)
• Added value of
• a forecaster?

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Long term forecasting (48-240 hrs)

• Ensemble prediction system

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Short term forecasting 18-48 hrs

• Use of Local area models (HiRLAM) resolution
  11/22 km

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Short term forecasting 18-48 hrs

• Regional differences can be made
• Added value of a forecaster?

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Nowcasting (0-18 hrs)

• High resolution local area models
• Radar/Satellite/Ground observations
• Added value of a forecaster.

NWP models Observations
End Production
forecaster
Workstation
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Nowcasting (0-18 hr)

• Combination of Sat-observations and modelfields
  to verify the numerical model.

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Nowcasting (0-18 hr)
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Nowcasting (0-18 hr)

• Combination of ground-observations and
  modelfields to verify the numerical model.

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Nowcasting (0-18 hr)

• Marking of important meteorological items. Quite
  often using of simple linear extrapolation.
  Finescale structures are usually not caught by
  the numerical model

Radar (loop)
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Example of 2 types of forecasts with a link to
GIS.

• Downscaling
• Chemical calamities

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Downscaling

• Highest resolution of Hirlam model 11 km
• Flightplanning on e.g. Airports (sometimes) needs
  finer scale
• Downscaling is bases on simple model of the
  Planet Boundary layer and on the use of high
  resolution topographical information of surface
  roughness derived from GIS datasets

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Downscaling
Model wind (10m)
Downscaling wind
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Downscaling
Windprofiles for runways on Amsterdam airport
http//oper.knmi.nl/downscaling
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Chemical calamities vs GIS

• In case of a chemical calamity KNMI provides
  meteorological information on a interactive
  internet portal of the responsible ministry of
  environment.
• Calculation of dispersion is made and combined
  with an advanced GIS functionality

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Short Demonstration of Meteorological Work Station