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MARINE WEATHER FORECAST OFF PERU

EXPERIMENTAL PRODUCT

Boris Dewitte, Patrick Marchesiello, & Katerina Goubanova (IRD)

The Weather Research and Forecast (WRF) modeling system is run on a 20km resolution grid over the Peru coastal area. Terrestrial data are provided by the US Geological Survey. The forecast uses initial and boundary data from the Global Forecast/Analysis System of the National Center for Environmental Prediction (NCEP, NWS/NOAA). The simulation starts one day before present using initial and boundary data interpolated from the 1-degree, 6-hourly NCEP Global Data Assimilation System (GDAS). Next, a 4 day forecast is conducted using boundary data from the 1-degree, 3-hourly NCEP Global Forecast System (GFS).

Note: GFS is run four times per day (00 UTC, 06 UTC, 12 UTC, and 18 UTC) out to 16 days. Computation is done with a resolution of about 55-km out to 3.5 days (84 hours), then about 80-km from 3.5 to 7.5 days (180 hours), and then about 110-km resolution for the rest - up to day 16 (384 hours). GFS data is then degraded for users on a global 1-degre resolution grid.

OBSERVATIONS:

• QuickSCAT: near real time product from KNMI
• Allmetsat: Observations at airport sites
• Windguru: report based on GFS forecast
• MeteoNews / TV5: report based on GFS and other models (Weather en Lima)
  

Collaborators: Florian Lemarié & Laurent Debreu (LMC-IMAG, Grenoble, France)

Warning: This product is part of an ongoing research effort at LEGOS, and does not represent official forecasts. These forecasts should not be used as the basis of any commercial, policy, or other decisions. They are strictly research tools for advancing the understanding of the regional circulation off Peru and Chile.