1. CARPE DIEM, Helsinki Recent activities of SMHI hydrological research unit within CARPE DIEM, area 3 Jonas Olsson, Barbro Johansson, Sofia Fogelberg Swedish Meteorological and Hydrological Institute Norrköping, Sweden

2. CARPE DIEM, Helsinki Completed work Comparison of precipitation estimates and their performance in runoff modelling Ongoing work Combining radar and gauge data Planned work Radar for hydrological forecasting: tests for actual flooding incidents in summer/autumn 2000

3. CARPE DIEM, Helsinki Study region - Gimån catchment PTHBV: interpolated gauge data HIRLAM: NWP model (+30h - +6h forecasts) RADAR: gauge-adjusted radar data MA22, MA11: mesoscale analysis, real-time (22) and climate- corrected(11)

4. CARPE DIEM, Helsinki Rainfall, summary of results HIRLAM: high in spring, irregular in summer RADAR: high in autumn (inhomogeneities)

5. CARPE DIEM, Helsinki Runoff, summary of results HIRLAM: overestimated spring flood Other sources: OK (R²=0.8-0.9)

6. CARPE DIEM, Helsinki Completed work Comparison of precipitation estimates and their performance in runoff modelling Ongoing work Combining radar and gauge data Planned work Radar for hydrological forecasting: tests for actual flooding incidents in summer/autumn 2000

7. CARPE DIEM, Helsinki Combining radar and gauge data Example 2000-07-13 Radar only Interpolated difference field (from pixles containing gauges) Radar and gauges combined Gauges only (PTHBV)

8. CARPE DIEM, Helsinki Combining radar and gauge data HBV-model runoff simulations (1999-09-01 - 2002-08-31) Improvement by radar

9. CARPE DIEM, Helsinki Completed work Comparison of precipitation estimates and their performance in runoff modelling Ongoing work Combining radar and gauge data Planned work Radar for hydrological forecasting: tests for actual flooding incidents in summer/autumn 2000