Page History

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• most commonly as absolute values:  
  • instantaneous values,
  • averages over a period,
  • totals over a period,  
  • maxima or minima over a period.
• sometimes as:
  • anomalies relative to re-forecast data
  • an assessment of how extreme the anomalies might be (Extreme Forecast Index and Shift of Tails).

Medium

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range forecasts

Daily Twice daily runs based on data times 00UTC and 12UTC data time are available for the following forecast times:are given in the ECMWF dissemination schedules:

• Atmospheric model ensemble medium range ( 10-day ) forecast (CONTROL-10 and CONTROL10-WAM analysis and forecasts based on 00UTC and 12UTC: hourly up to T+90, 3-hourly from T+93 to T+144, 6-hourly from T+150 to T+240.medium range (15-day) ENS & ENS-WAM analysis and forecasts based on 00UTC 3 hourly up to T+144, 6-hourly from T+150 to T+360. ???????/HRES) and analysis and forecast data (Set I-i, I-ii, I-iii)
• Atmospheric model ensemble 15-day forecast (ENS) and analysis and forecast data (Set III)
• Ocean wave model ensemble 15-day forecast (ENS-WAM) and analysis and forecast data (Set IV-i, IV-ii, IV-iii)

For Members of the Boundary Conditions (BC) optional programme (members using ECMWF IFS model forecast values as boundary conditions for their own local areas models) Medium Range forecasts based on

Twice daily runs based on data times 06UTC and 18UTC data times are available for the following forecast times:
are given in the ECMWF dissemination schedules:

• Atmospheric model ensemble 15-day forecast (ENS) and analysis and forecast data (Set III)medium range (10-day) CONTROL-10 and CONTROL10-WAM analysis and forecast based on 06UTC and 18UTC:  hourly up to T+90, 3-hourly from T+93 to T+144

Note: Precipitation forecasts are provided as values accumulated from the start of the forecast integration.  The range of the daily variation of the forecast 2m temperature and wind gust is best estimated by retrieving the forecast maximum and minimum values.  The combination of accumulated and instantaneous forecast information can occasionally lead to inconsistencies as in both cases the valid time is defined as the time at the end of the period (e.g. during the passage of a cold front when significant precipitation amounts might be accumulated by the IFS models over the whole time interval though instantaneous cloud-free conditions will be shown at the end of the interval). ?????Definitive information on the ECMWF dissemination schedule and products can be found in the the Catalogue of ECMWF real-time products (HRES*: Set i, HRES*-WAM: Set ii, ENS: Set iii, ENS-WAM: Set iv).

Extended Range forecasts

Run Once daily runs based on 00UTC data time, six 7-day ranges per run are available for the following forecast times :

For data:

• ENS-extended & ENS-WAM-extended: 6-hourly from T+366 to T+1008. ?????
• ENS-extended & ENS-WAM-extended ensemble means and anomalies: 
  • T+0 to T+168(week1),  T+168 to T+336(week2),  T+336 to T+504(week3),  T+504 to T+672(week4),  T+672 to T+840(week5),  T+840 to T+1008(week6). ?????

For  Sea :

• ENS-extended & ENS-WAM-extended: 6-hourly from T+366 to T+1008. ?????

data times 00UTC are given in the ECMWF dissemination schedules:

• Atmospheric model ensemble extended forecast (ENS extended) forecasts of ensemble means and anomalies. 
• Ocean wave model ensemble extended forecast (ENS-WAM extended) and wave forecast data (set VI-v-c)ENS-extended & ENS-WAM-extended ensemble means and anomalies (output is for corresponding forecast weeks) on:T+0 to T+168(week1),  T+168 to T+336(week2),  T+336 to T+504(week3),  T+504 to T+672(week4),  T+672 to T+840(week5),  T+840 to T+1008(week6). ?????

Note: Precipitation forecasts are provided as values accumulated from the start of the forecast integration.  The range of the daily variation of the forecast 2m temperature and wind gust is best estimated by retrieving the forecast maximum and minimum values.  The combination of accumulated and instantaneous forecast information can occasionally lead to inconsistencies as in both cases the valid time is defined as the time at the end of the period (e.g. during the passage of a cold front when significant precipitation amounts might be accumulated by theIFS the IFS models over the whole time interval though instantaneous cloud-free conditions will be shown at the end of the interval).

Definitive information on the ECMWF dissemination schedule and products can be found in the the Catalogue of ECMWF real-time products (ENS-extended: Set vi, ENS-WAM-extended: Set iv-i).

Seasonal forecasts

These are made available Once monthly runs based on 00UTC data time on 1st of each month run on the 5th of each month in the form:

For data:

• Seasonal

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• 7-month forecast (SEAS) and forecast data (set V)
• Seasonal 7-month forecast (SEAS-WAM) and wave forecast data (set V-iii-c and set V-v-e))

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For ecCharts

• Seasonal: Monthly ensemble means and anomalies means from Month 0 to Month 7, extended to Month 12 four times per year.

See available Seasonal datasets for more detail of the resolution of the data and the parameters available and the dissemination schedule.

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