Anomaly probability products show the probability that parameter's weekly means exceed the 12-years model climatology. Available parameters are listed in the Table 10.7.

Table 10.7 (ECMWF Local Code Table 2, parameter table, Version Number 131)

FIELD CODE	MARS ABBREV.	FIELD NAME	UNITS	NO. OF BITS/VAL.
1	2TAG2	2M Temperature anomaly of at least 2 K	%	8
2	2TAG1	2M Temperature anomaly of at least 1 K	%	8
3	2TAG0	2M Temperature anomaly of at least 0 K	%	8
4	2TALM1	2M Temperature anomaly of at most -1 K	%	8
5	2TALM2	2M Temperature anomaly of at most -2 K	%	8
6	TPAG20	Total precipitation of at least 20 mm	%	8
7	TPAG10	Total precipitation of at least 10 mm	%	8

Data values are percentage probabilities of the indicated meteorological parameter being above the lower threshold or being below the upper threshold or lying between the upper and lower thresholds. Monthly forecast anomaly probability products are disseminated together with other real-time Monthly forecast data.

Monthly Forecast Anomaly Probability requirements

The following command language parameters are specific for the control and perturbed forecast requirements. Other parameters are listed under the general Monthly Forecast requirements above.

STREAM	=	ENSEMBLE FORECAST		[ENFO]
TYPE	=	EVENT PROBABILITY		[EP]
DOMAIN	=	GLOBAL	[G]
NUMBER	=	OFF
PARAM	=	2 METRE TEMPERATURE ANOMALY OF AT LEAST 2K 2 METRE TEMPERATURE ANOMALY OF AT LEAST 1K 2 METRE TEMPERATURE ANOMALY OF AT LEAST 0K 2 METRE TEMPERATURE ANOMALY OF AT MOST -1 K 2 METRE TEMPERATURE ANOMALY OF AT MOST -2 K TOTAL PRECIPITATION ANOMALY OF AT LEAST 10 MM TOTAL PRECIPITATION ANOMALY OF AT LEAST 20 MM		[2TAG2] [2TAG1] [2TAG0] [2TALM1] [2TALM2] [TPAG10] [TPAG20]
LEVTYPE	=	SURFACE	[SFC]	*
LEVELIST	=	OFF	*
STEP	=	96-264 264-432 432-600 600-768

GRIB section 1 definition for Monthly Forecast Anomaly Probability products

The ECMWF local GRIB definition used for Monthly Forecast Anomaly Probability data is 5 (http://www.ecmwf.int/publications/manuals/libraries/gribex/localDefinition5.html ).

18-01-2011