POAMA-2 Hindcasts and Forecasts on OPeNDAP Server


POAMA-2 hindcast and realtime data are now available on an OPeNDAP server.

Conditions of Use

The data is made available for research collaboration only. Full conditions of use.

The Model Configuration

POAMA-2 consists of both a seasonal and a monthly forecast system using version 2.4 of the model. POAMA-2 is also a multi-model ensemble consisting of three different model configurations. For the seasonal forecasts these configurations are called p24a, p24b and p24c and for the multi-week forecasts they are called m24a, m24b, m24c

Model setsm24a, m24b, m24c
Ensembles11 Members and 1 Ensemble Mean. (e00 -> e10 & emn)
Forecast Availability9 month lead times are available from 3rd of May, 2012
Forecast FrequencyForecasts are available on a twice weekly basis. Start Dates are Sunday and Thursday.
Forecast Lead TimeLead time to 270 days.
Hindcast AvailabilityJan 1981 -> Jun 2014
Hindcast Frequency Hindcasts start on the 1st, 11th and 21st of the month.
Hindcast Lead TimeLead time to 270 days for years 1981-2011.

Data available - Structure on the OPeNDAP Server

The data that is available on the OPeNDAP Server is catalogued under the following folder/directory structure.

Higher Level Directories

These are the directories that are available on the OPeNDAP server.

  1. Current POAMA system
    1. POAMA 2.4 Multiweek Real Time Forecasts/
    2. POAMA 2.4 Multiweek Hindcasts from 1981/
  2. Ocean Re-analysis
    1. PEODAS Re-Analysis/
    2. PEODAS Real Time/
  3. Previous POAMA systems
    1. POAMA 2.4 Seasonal Real Time Forecasts/
    2. POAMA 2.4 Seasonal Hindcasts from 1960/
    3. POAMA 1.5 Data Catalog/
  4. Other POAMA Related Datasets
    1. POAMA 2.4 Control Runs/

Second Level Directories of the Current POAMA system

The m24 dataset has been broken up into Daily, Weekly, Monthly time spans. This minimises the number of files presented, but not all the files are listed, so the "All Multiweek Realtime Forecasts" directory contains the complete list of files.

  1. Daily Datasets
    1. Model A/
    2. Model B/
    3. Model C/
    4. Multimodel/
  2. Weekly Datasets
    1. Model A/
    2. Model B/
    3. Model C/
    4. Multimodel/
  3. Monthly Datasets
    1. Model A/
    2. Model B/
    3. Model C/
    4. Multimodel/
  4. Masks
  5. Atmosphere Mask File
  6. Ocean Mask File
  7. Multiweek Realtime Tailored Products/
  8. All Multiweek Realtime Forecasts/

Lower Level Directories

In the POAMA Hindcast and Forecast folders, there are a number of ensemble folders and climatology folders:

Multi Model Configurations and Multi Model Anomanlies

Three different model configurations are used (p24a, p24b, p24c) for the seasonal and (m24a, m24b, m24c) for the monthly/multi-week configurations. These should be used together to form a multi-model ensemble. Ensure that you use the Model's Climatology with the Model's Ensemble or Ensemble Mean when determining Multi Model Anomalies.

Note about Model Climatology

Model climatology is calculated by averaging all ensemble members, for a given start date in the year, over all the years specified in the climatology. The climatologies are lead-time dependent.

The model climatology files will have the same format as the individual forecasts, one can then calculate anomalies by subtracting the climatology from the forecast file. Be aware that the climatology file may be shorter that the individual ensemble files.

File Naming Convention

Current files - Atmoshpere only

File PrefixSizeDescription
dagc_YYYYMMDD.nc~300 MBDaily Atmosphere file - 270 days
wac_YYYYMMDD.nc~21 MBWeekly Atmosphere file - 11 weeks
mac_YYYYMMDD.nc~17 MBMonthly Atmosphere file - 9 full months
moc_YYYYMMDD.nc~46 MBMonthly Ocean file - 9 full months - Available through All Multiweek Realtime Forecasts link.
w2ac_YYYYMMDD.ncvariousFortnightly Atmosphere file - 10 x 2 weekly values
m3ac_YYYYMMDD.ncvariousSeasonal Atmosphere file - 7 x 3 monthly values

Older files - these files are Ocean files and pre-processed Atmosphere files

File PrefixSizeDescription
da_YYYYMMDD.nc~300 MBDaily Atmosphere file - same as dagc_
dag_YYYYMMDD.nc~300 MBDaily Atmosphere file - same as dagc_
mn_hrzYYYYMMDD.nc~55 MBDaily Ocean file
ma_YYYYMMDD.nc~19 MBMonthly Atmosphere file - first partial month and 9 full months
oa_YYYYMMDD.nc~23 MBMonthly Ocean file - first partial month and 9 full months
wa2_YYYYMMDD.nc~7 MBFortnightly Atmosphere file - 6 fortnights
wa_YYYYMMDD.nc~21 MBWeekly Atmosphere file - same as wac_

Known Issues

IssueFiles affectedDetails
Surface wetness units All atmospheric files: ma, sa, dag, dar sfc_wet units are incorrectly reported as "m" (metres), not "mm" (millimetres).

Data available - Historical Structure

A description of the older POAMA files and the planned progression of files (this is a dated page).

A description of how to get the Daily Forecast from the OPeNDAP Server.

OPeNDAP server

Click here to go to OPeNDAP server