196119711981199120012011 IFS-(Var)EPS re-forecasts Avaialbility of VarEPS Reorecasts (% Members,...

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1961 1971 1981 1991 2001 2011 IFS-(Var)EPS re-forecasts Avaialbility of VarEPS Reorecasts (% Members, started once every Week) Day0 Day+5 Day+10 Day+30 Day+90 IFS-(Var)EPS Medium-to-extended range forecast of available water resources with PREVAH Estimation of deviation from climatological mean (focus on water scarcity and low-flows) Observed climatolog Towards Seasonal Forecasts

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Transcript of 196119711981199120012011 IFS-(Var)EPS re-forecasts Avaialbility of VarEPS Reorecasts (% Members,...

Page 1: 196119711981199120012011 IFS-(Var)EPS re-forecasts Avaialbility of VarEPS Reorecasts (% Members, started once every Week) Day0Day+5Day+10Day+30Day+90 IFS-(Var)EPS.

1961 1971 1981 1991 2001 2011

IFS-(Var)EPS re-forecasts

Avaialbility of VarEPS Reorecasts (% Members, started once every Week)

Day0 Day+5 Day+10 Day+30 Day+90

IFS-(Var)EPS

Medium-to-extended range forecast of available water resources with PREVAHEstimation of deviation from climatological mean (focus on water scarcity and low-flows)

Observed climatology

Towards Seasonal Forecasts

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Skill of ECMWF VarEPS monthly reforecasts

Kein Skill nach 10 TagenWie verifizieren (mehr)tägliche Abflussprognosen?

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runo

ff

lead-time

threshold severity

duration

• duration = length of longest forecast period below MMR• severity = cumulative runoff deficit w.r.t. MMR• Magnitude= severity/duration

• Calculated for each monthly forecast (weekly issued, 1991-2008), 5 members and according observations• Results are ensemble forecasts of indices & verification

Drought Indices

Mean monthly runoff

MMR

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Low-Flow Duration

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Low-Flow Severity

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Low-Flow Magnitude


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