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Progress Report on Global Data Processing System for 1999
ISRAEL METEOROLOGICAL SERVICE
1. Summary of Highlights
During 1999 an effort was devoted to adapt all the operational systems to be Y2K
compliant.
DWD multi-processor HRM version was regionally adapted. Since November 1999 it was put
into quasi-operational run up to 48 hrs. Till November 1999 a workstation version of
"Euroupa-Model" was in use.
A version of the regional WAM model for Eastern Mediterranean has been fully
implemented .
2. Equipment in Use
2.1 operational equipment
| Computer |
memory (MB) |
Operating system |
| 1xSGI Origin 2000 server, 2 cpu |
256 |
IRIX 6.4 |
| 2xSGI Origin 200 servers, 1 cpu |
128 each |
IRIX 6.4 |
| 1xSGI O2 workstation |
64 |
IRIX 6.3 |
| 3xSGI INDY workstations |
64 each |
IRIX 6.2 |
| 4xSGI INDY workstations |
32 each |
IRIX 6.2 |
| 1xIBM RS/6000 320H |
48 |
AIX 3.2.5 |
Total disc storage is about 95 GB (including external SCSI RAID)
External devices : 1 Roland DPX-2700 plotter
1 Roland DPX-3600 plotter
1 Dataproducts CI-500e line dot matrix printer
One of the Origin 200 computers is used as a database server and the other is used as a
communication server ( backing up each other ), while Origin 2000 is used mainly for NWP
operational and research activities.
2.2 Communications
- ETHERNET
- Point to point links
- National public network
- Frame Relay link to RTH Offenbach (64 KB)
3. Data and Products from GTS in Use
3.1 Data
Number of observations/day in average
| SATEM |
900 |
| TEMP/PILOT (TTAA, PPAA, UUAA) |
1000 |
| TEMP (TTBB, UUBB) |
600 |
| SYNOP/SHIP/BUOY |
9300 |
| AVIATION DATA |
34000 |
3.2 Products
| GRID KWBC |
32 bulletins |
| GRID EGRR |
875 bulletins |
| GRID EDZW |
1112 bulletins |
| GRIB EDZW |
150 bulletins |
| GRIB ECMF |
42 bulletins |
| CDF in T.4 format |
90 charts |
4. Data Input System
Fully automated. INFORMIX DBMS is used for the data management.
5. Quality Control System
no change
6. Monitoring
no change
7. Forecasting System
7.1 System run schedule
| Time (UTC) |
System running |
| 01:40 02:00
03:05
03:40
07:15
10:40
13:40
14:00
15:05
15:40
19:15
22:40 |
00 UTC preliminary analysis 00 UTC MM4 forecast (00h-24h)
00 UTC quasi-operational regional forecast (00h-48h)
00 UTC main analysis
00 UTC WAM forecast (00h-48h)
00 UTC final analysis
12 UTC preliminary analysis
12 UTC MM4 forecast (00h-24h)
12 UTC quasi-operational regional forecast (00h-48h)
12 UTC main analysis
12 UTC WAM forecast (00h-48h)
12 UTC final analysis |
MSL pressure analysis is carried out every 3 hours with cut-off of 0:40 and 2:40 hrs.
7.3 Short - range forecasting system.
There is no essential change in MM4 model run which is now used for a preliminary
guidance.
Hereby are the characteristics of a new regional model used quasi-operationally.
7.3.2 Model
Analysis and forecast data of GME from DWD are used
as an initial and lateral boundary data.
| Basic equations |
- primitive equations |
| Independent variables |
l - longitude in rotated
coordinate system
j - latitude in rotated coordinate system
h - vertical coordinate
t - time |
| Time dependent variables |
- Ps - surface pressure
T - temperature
qd - water vapor
qw - cloud water content
u,v - horizontal wind components |
| Diagnostic variables |
- p - sea level pressure
f - geopotential
w - vertical velocity |
| Numerical Technique |
- Rotated spherical grid, mesh size=0.25°
- (~ 27 km), Arakawa C-grid.
- Hybrid vertical coordinates, 20 layers
- Second order central differencing in space is combined with a leap frog time scheme and
a split semi-implicit correction step, 150 sec. time step ; Asselin filter.
- Lateral boundary formulation due to Davies (1976)
- Fourth-order linear horizontal diffusion, slope-correction for the diffusion of
temperature.
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| Integration domain |
- the rectangular area in rotated spherical coordinates, the corners are located at:
( 11.88 E, 25.47 N)
( 38.34 E, 18.77 N)
( 13.12 E, 50.45 N)
( 53.46 E, 40.12 N)
121 x 101 grid points
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| Physical parametrization |
- Grid-scale precipitation including parameterized cloud microphysics.
- Mass flux convection scheme after Tiedtke (1989).
- Vertical diffusion after Louis (1979) for the surface layer, an extended level-2 scheme
after Mellor and Yamada (1974) higher up.
- d - two-stream radiation scheme after Ritter and Geleyn
(1992) for short and longwave fluxes, full cloud-radiation feedback.
- Two-layer soil model after Jacobsen and Heise (1982) including snow and interception
storage.
- Climate values changing monthly (fixed during forecast) in third layer.
- Fixed analysed sea surface temperature.
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| Topographic data sets |
- Received from DWD for all grid points.
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7.3.3 The products of short-range model run
The products are: sea level pressure, geopotential, temperature, wind and relative
humidity at 1000, 975, 950, 925, 900, 850, 700, 500 and 300 hpa
Surface level: temperature, max/min temperature, wind, relative humidity, cloud
amount and accumulated 6-hours precipitation.
All products are predicted for 6 to 48 hours with output every 6hr.
Model runs twice per day based on 00 UTC and 12 UTC.
7.7 Regional WAM model version
The regional wave model version is identical to the WAM model, cycle 4, in all aspects,
except the following:
| Model type: |
Spectral model (third generation) |
| Integration domain: |
Eastern Mediterranean sea |
| Grid : |
From 30° N to 39°
N and from 15° E to 37° E. |
| Resolution: |
0.25° latitude; 0.25°
longitude. |
| Frequency resolution: |
25 frequency components spaced between 0.04 Hz and 1 Hz. |
| Direction resolution: |
12 equally spaced direction components. |
| Forecast range: |
+24, +36, +48 hours. (2 times/day) |
| Source timestep: |
600 sec |
| Data inputs: |
surface (10m ) analysis and forecast maps (+12, +24, +36,+48 hours)
of the wind components are used. These maps are produced by GME, DWD. |
| Surface classification: |
No sea ice |
8. Verification of prognostic products
Verification against analysis for region (27E-37E , 28N-40N)
EM |
HRM |
RMS error of mean sea level
pressure (hPa) |
| |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
| 24h |
1.6 |
1.6 |
1.2 |
1.2 |
1.2 |
1.3 |
1.2 |
1.1 |
0.9 |
0.9 |
1.4 |
| 48h |
2.2 |
2.1 |
1.6 |
1.7 |
1.8 |
2.2 |
2.0 |
1.4 |
1.1 |
0.6 |
2.1 |
| 72h |
2.5 |
2.6 |
2.0 |
2.3 |
2.1 |
2.7 |
2.8 |
1.6 |
1.3 |
|
|
RMS error of geopotential
height at 500 hPa (m) |
| |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
| 24h |
18 |
16 |
13 |
10 |
12 |
9 |
9 |
11 |
11 |
11 |
14 |
| 48h |
25 |
25 |
17 |
20 |
18 |
16 |
12 |
15 |
15 |
17 |
20 |
| 72h |
32 |
31 |
21 |
24 |
19 |
19 |
16 |
16 |
19 |
|
|
RMS error of temperature at
850 hPa (C°) |
| |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
| 24h |
1.6 |
1.5 |
1.6 |
1.5 |
1.4 |
1.3 |
1.4 |
1.3 |
1.3 |
1.2 |
1.1 |
| 48h |
1.9 |
1.8 |
1.9 |
2.0 |
1.6 |
1.8 |
1.9 |
1.6 |
1.6 |
1.4 |
1.5 |
| 72h |
2.0 |
2.0 |
2.1 |
2.3 |
1.8 |
2.1 |
2.3 |
1.9 |
1.8 |
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- From the end of January 1999 the verifications have been performed on regular basis.
9. Plans for the future
- The regional model will be fully implemented.
- Further development and improvement of the regional WAM model.
- An ongoing inprovement of the GDPS operations at IMS.
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