Application of low- resolution ETA model data to provide guidance to high impact weather in complex terrain Juha Kilpinen Finnish Meteorological Institute (FMI), Finland Juan Bazo, Gerardo Jacome & Luis Metzger Servicio National de Meteorologia e Hidrologia (SENAMHI), Peru
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Application of low- resolution ETA model data to provide guidance to high impact weather in complex terrain Juha Kilpinen Finnish Meteorological Institute.
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Application of low-resolution ETA model data to provide guidance to high impact weather in complex terrain
Juha Kilpinen
Finnish Meteorological Institute (FMI), Finland
Juan Bazo, Gerardo Jacome & Luis Metzger
Servicio National de Meteorologia e Hidrologia (SENAMHI), Peru
Co-operation between FMI and SENAMHIInstitutional development
2. Post-processing of NWP output (training, application development: testing of Kalman filtering for NWP data)
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EUMETCAL training tools used
User-interface for the verifcation system at SENAMHI
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Introduction• Peruvian ETA-model data is available for guidance at Peruvian
Hydro-meteorological service (SENAMHI). The application of rather low resolution (22 km grid) data is not straight forward in complex terrain in terms of topography, climatic zones and sharp land-sea gradient.
• The applicability of the data is evaluated and if some problems are encountered a solution will be searched. So far data has been partly verified and tests with Kalman filter have started. The test data includes maximum and minimum temperature.
• Another focus is the heavy precipitation in Machu Picchu area resulting flooding and danger to life and property.
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• ETA-model• Resolution 22 km
• 18 vertical levels
• Output 6 h interval up to 72 h
• Kain Frish cumulus parameterization
• the GFS global model data is used for the lateral boundaries
• No data assimilation is made
• Test data periods: temperature 2009-2010
• Precipitation 2010
• Observations (21 stations) Tumbes
Piura
Huánuco
Pucallpa
Lima
Andahuaylas
Cuzco
Tacna
Chiclayo
Chimbote
Cajamarca
Tarapoto
Yurimaguas
Iquitos
Tingo Maria
Trujillo
Ayacucho
Puerto Maldonado
Arequipa
Juliaca
Pisco
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Data
Methods – post-processing/Kalman filter• Only for temperature
forecasts: • Two state parameters
• TKalman = B1 + B2 * TETA
• Optimized estimation of measurement noise R and system noise Q
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Methods - verification• For temperature
forecasts: • ME (Mean Error)
• RMSE (Root Mean Squared Error)
• HR (Hit Rate) (not shown)
• Also other scores
• For precipitation forecasts (categories):
• B (Bias)
• PC (Percent correct)
• POD (Probability of Detection)
• FAR (False Alarm Rate)
• KSS (Kuipers Skill Score)
• TS (Threat Score)
• ETS (Equility Threat Score)
• …
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Stations in focus:
Cusco 3399 m Pucallpa 154 m Andahuaylas 2866 m Huanuco 1859 m Lima 13 mTacna 452 m
Conclusions• The preliminary results indicate that ETA model has
problems with temperature forecasts in most regions; in tropical rain forest, at mountains and near coastline affected by cold sea current. The application of Kalman filter was used to minimize systematic errors from the ETA-model and rather encouraging results was received.
• For precipitation forecasts ETA model is not able to forecast higher precipitation amounts correctly
• A higher resolution (e.g. WRF) NWP model would be a way to inprove the forecast quality in complex terrain