The Flood Summary layers show where GloFAS forecasts a flood is forecasted within the full 30-day forecast horizon (days 1-30) or within 3 distinct time periods : (days 1-3, days 4-10 , and or days 11-30. For ) for GloFAS model river network with upstream area larger than 1000km2, the layer has different colour depending on the forecast value during the forecast period:
- Purple: maximum of the ensemble mean discharge is >20 year (purple)
- Red: maximum of the ensemble mean discharge is between 5-20 year
- Dark yellow: maximum of the ensemble mean discharge is between 2-5 year
- Light yellow: total probability >20% exceeds 2-year
1000 km2 until GloFAS version 3, and larger than 250km2 from GloFAS version 4. The colours are defined according to the dominant flood signal in the probability of exceedance of the 2-, 5- and 20-year flood thresholds as follows:
- Dark purple: 20-year probability exceeds 75%
- Medium purple: 20-year probability between 50-75%
- Light purple: 20-year probability between 30-50%
- Dark red: 20-year probability is below 30% and 5-year probability exceeds 75%
- Medium red: 20-year probability is below 30% and 5-year probability is between 50-75%
- Light red: 20-year probability is below 30% and 5-year probability is between 30-50%
- Dark yellow: 5-year probability is below 30% and 2-year probability exceeds 75%
- Medium yellow: 5-year probability is below 30% and 2-year probability is between 50-75%
- Light yellow: 5-year probability is below 30% and 2-year probability is between 30-50%
