1. Use of radar data in the HIRLAM modelling consortium
Magnus Lindskog
Swedish Meteorological and Hydrological Institute
Lisbon, Portugal, 8 October 2003

2. Structure Introduction Radar wind processing and assimilation
Verification against radar derived precipitation
Direct use of radar reflectivities
Future plans

3. Typical weather radar
8 km 7 6 5 4 3 2 1 km

4. HIRLAM main components
assimilation
forecast

5. De-aliasing
Mapping into torus
Radial wind velocities from one scan

6. Illustration of de-aliasing
Observed velocities
De-aliased velocities .

7. Filtering (Method 1)
Generation of vertical profile of horizontal winds using different methods:
Verification of different methodoligies against radiosondes (1 Oct July profiles)
VAD

8. Filtering (Method 2) Horizontal filtering: superobservations
Time filtering:
unfiltered and filtered observations
filtered observations and model

9. Assimilation experiment
10 day experiment
(1-10 Dec., 1999)
Three parallel runs
CRL:conv. obs.
RWD:conv. obs+rwd
VAD:conv. obs.+VAD
Integration area
and radar sites
RMS of +24 h wind forecasts at 850 hPa

10. Results from pre-operational monitoring of VAD-profiles
BIAS BG-OB wind speed (m/s)
RMS BG-OB wind speed (m/s)

11. Radar derived precipitation for verification of products from BALTEX
regional reanalysis project

12. HIRLAM Precipitation

13. Radar simulation model
CASE study: 15 July, 2000 at 12 UTC
Synoptical situation

14. Radar simulation Model

15. Radar simulation Model

16. Daily ratios
computed for each grid and then
classified by altitude and month respectively. Values from 2002.
Deviations versus altitude
Deviations versus season

17. Future plans Operational assimilation of VAD profiles
Extended radial wind experiments
Increased use of radar data for verification of models
Assimilation of radar derived precipiation/reflectivities
Support operational exchange of radar data