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Operational Scheme and Schedule: Basics

Basic scheme (analysis + forecast) Global-Modell (GME, global and synoptic-scale) Lokal Modell (LM, highly resolved mesoscale model)

3 runs per day 00, 12, 18 UTC 03, 06, 09, 15, 21 UTC only analysis

Schedule determined by data cut-off computational resources user priority

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Operational time schedule of DWD-models

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Boundary values and forecast range

forecast range of LM: 48h every hour LM gets new boundary data from GME

smooth transition within 8 grid points continous data assimilation

forecast range of GME 00, 12 UTC: 174h 18 UTC: 48h

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Schedule of GME/LM-runs (relative to starting time)

+2h 06min start of GME-analysis +2h 23 min start of LM-analysis +2h 30 min start of GME-forecast +2h 34 min start of LM-forecast +3h 45 min 48h-LM-forecast available +4h 30 min 174h-GME-forecast available Postprocessing-

Graphic-files: 5 min local forecast parameters: 15 min

Availability of final products about 5 hours after starting time

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Basic postprocessing

Interpolation between model levels and pressure levels model level (34m): Typical vertical profiles (depending on

stability, e.g)• T 2m

• wind 10m LM-model-levels 26 and 27 for 850-hPa-level, e.g

Reduction of model surface pressure to mean sea level base: adiabatic gradient in the case of mountainous areas (e.g. Greenland)

• reduced amount of vertical temperature gradient

• however, often too high surface pressure values

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Postprocessing (further steps)

Automatic weather interpretation for all fields and local products: describing model weather

output of GME and LM

Generation of graphical and alphanumerical products general analysis and forecast fields MPEG-files (TriVis) with animations of

• cloud development

• precipication

• wind

• temperature local model output as meteograms and local soundings local direct model output as alphanumerical information local output through Kalman, Model Output Statistics and

Perfect Prog

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MAP: Ps/T850, GME (21-11-01, 00 UTC)+48h

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Trivis (LM, precipitation): 19.12.01, 00 +24h

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LM-(17-04-01, 00 UTC+48h):Frankfurt/Kassel/Essen

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Postprocessing (Cross Sections)

Time series of preselected cross-sections of relevant parameters

cloudiness wind temperature

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LM(+30h)-cross-section Frankfurt to Tarbes (4-4-02, 06)

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Postprocessing (followed-up-models)

Followed-up models (based upon GME-/LM-output) sea state models

• water level (e.g. tides)

• waves trajectory model

• pollution (e.g.) winter road maintenance

• SWIS (1-D-model for road surface temperature and road condition)

agro- and biometeorological models• fungus disease

• ultraviolett irradiation test: 1-D-model for fog and low clouds

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SWIS-Input-EditorBereich: Ruhrgebiet Nr.:5420Höhenstufe: 0-200 Meterausgegeben am: Donnerstag, den 14.12.1995 von: Regionalzentrale EssenMeßstelle: Altenessen Nr.:H424

09-UTC-Startwerte: Während des Vorhersagezeitraums:Belagstemperatur: 7 Sicht: gutUntergrundtemperatur: 4Straßenzustand: trocken Schneedecke: nein

UTC 9 12 15 18 21 0 3 6 9 12

Lufttemperatur 0 3 1 2 0 1 1 4 6 8Taupunkt 0 1 0 -1 0 1 1 1 2 1

UTC 8-10 11-13 14-16 17-19 20-22 23-01 02-04 05-07 08-10 11-13

Windrichtung 210 210 210 220 230 230 230 300 310 310Windgeschwindigkeit 10 10 10 15 20 20 20 30 30 10Nebel nein nein nein nein nein nein nein nein nein neintiefe Wolken 3 4 7 8 8 7 7 8 3 2mittelhohe Wolken 1 4 8 8 8 8 8 7 3 0hohe Wolken 1 4 1 5 7 5 7 7 1 0Regenmenge 0 0 0 0 0 10 2 3 0 0Schneemenge 0 0 0 50 20 40 8 0 0 0

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detailed road weather forecast for „Ruhrgebiet“FD52 141100 DWEMdetaillierte Strassengebietswettervorhersage

Klimagebiet: Ruhrgebiet Höhenstufe: 0 - 200 Meterausgegeben am: Donnerstag, den 14.12.1995 um 12 Uhrvon: Regionalzentrale Essen

Uhrzeit (MEZ): 13 16 19 22 1 4 7 10 13

Bewölkung: 4 6 8 8 8 8 8 4 2Niederschlag: S05 S02 SR05 SR01 R00

Wind (km/h): SW20 SW20 SW30 SW40 SW40 SW40 NW60 NW60 NW60Böen: SW60 SW60 SW60 NW90 NW90 NW90

Lufttemperatur: 3 1 0 0 1 1 4 6 8Belagstemperatur: 5 2 0 0 1 1 2 8 10

Strassenzustand: Schnee Schnee Schnee naß naß naß

Bemerkung: Am Abend aufkommende Schneeglätte; bei ansteigenden Temperaturen taut der Schnee jedoch rasch auf.

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Computer-system: NWP-runs, IBM

distributed memory massively parrallel processors application units: 1920

different model areas are related to different processors communication between these areas is performed COS4: 448, COS5: 1472 processor units

memory: 1240 GByte disk capacity: 7562 GByte peak performance of each processor unit: 2.4 GFlop/s

„beat frequency“: 375 MHz each „beat“ : e.g. 8 floating point operations (by considering

more bits)!

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Computer-system: data storage, communication (I)

2 IBM p690, each 32 processors 128 GB memory 864 GB disk capacity tasks (e.g.)

• developments, tests

• routine jobs (decoding of observations, production of graphics, etc)

• data handling

Storage server (e.g., test results) 3 x 13.5 TByte

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Computer-system: data storage, communication (II)

data amount 174h-GME-run: 40 GByte 48h-LM-run: 5 GByte totaly NWP-production > 120 Gbyte per day (follow-up models

inclusive )

Archive (SGI O200) 24 processors 24 GB memory 853 GB disc capacity

archiving of data on cassettes (600 TByte)

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Operational computer system