Seasonal forecasts Laura Ferranti and the Seasonal Forecast Section User meeting 15-17 June 2005.

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Presentation transcript:

Seasonal forecasts Laura Ferranti and the Seasonal Forecast Section User meeting June 2005

Outline: -Performance Drought conditions over the Iberian peninsula -Progress with the multi-model system - Some results from the experimentation done to test the next system (S3).

Performance Monsoon 2004 Tropical storm activity Anomalously cold Feb 2005

SST predictions for the JJA 2004 i.c. 01/05/2004 JJA 2004 SST anomaly Op. anal-era40 ( )

Precipitation JJA 2004 GPCP anomalies ( ) Prob. for the below normal categoryEnsemble mean anomaly

Tropical storm activity: Climate 2004 Observed tropical storm frequency over the Atlantic: Over Western North Pacific:

2mt anomalies JFM 2005

January February March 2005

user meeting June Seasonal forecast performance Feb 2005 Forecasts starting on 1 st January

Seasonal forecast performance JFM 2005 Z 500 Feb 2005

Accumulated precip 1 Sept 2004 – 10 June 2005

Accumulated precip 1 Oct 2004 – 31 May 2005 % of normal Instituto da Água, Portugal

Drought index 31 May 2005 Instituto da Água, Portugal Weak drought Moderate drought Severe drought Extreme drought % of territory affected by drought 31 May May 05 Weak drought 45 Moderate drought 2823 Severe drought 2028 Extreme drought 4844

Precipitation, Centre/South Portugal Instituto da Água, Portugal Monthly precipitationAccumulated Accumulated, climate

Southern Iberian Peninsula 40-37N 9E-0W: Soil MoisturePrecipitation (GPCP) months

Seasonal predictions of precipitations:

summer 2005 versus summer 2003 Precipitation (GPCP) Soil Moisture N 0-15E

Probability of 2m Temp > upper tercile of the model climate JJA 2005 JJA 2003

Probability of 2m Temp > upper tercile of the model climate for JJA 2005 Forecasts start 1 May 2005 Met Office ECMWF Météo France

Probability of 2m Temp > upper tercile of the model climate Forecast start 1 April 2005 Met Office ECMWF Predictions for JJA 2005 Météo France

Conclusions -Predictions of the monsoon precipitation for JJA 2004 verified well. -Over the West Pacific basin the forecast predicted successfully higher tropical storm activity than the climatology. Over the Atlantic the forecast has not been as good. -Beyond the first month the skill of the seasonal forecast for a single month can be limited by the chaotic nature of the atmosphere. -Dry conditions over the Iberian Peninsula were consistently predicted since November For the next summer warm anomalies are predicted over the South- western Europe.

Multi-model : Verification of the individual multi-model component is completed this includes the original and revised Météo France system. Multi-model products as well as their verification is in progress. What issues are involved for reaching the operational status: - A suitable hind-cast ensemble size covering the same period. - Some coordination on how to display the products on the web.

Météo France S2 Météo France S1

Météo France S2Météo France S1

Météo France S2Météo France S1

System 3 experimentation:

Too weak easterlies

System 3 experimentation:

Experimentation for System 3: Results from coupled integrations with a more recent version of the atmospheric model (CY29R1) indicate generally a higher skill except for a specific season and location. This seems to be related with the mean state of the atmospheric model that tends to underestimate the easterlies over the central tropical Pacific. One possible solution to this problem may be a correction term during the model integration. Further experimentation is in progress including the testing of the latest atmospheric cycle.