|
|
Event probability
products provide the probabilities of the occurrence of weather
events at each grid point. The probabilities are calculated on the
basis that each ensemble member is equally likely. Probability
fields for wave height (with thresholds of 2,4,6,8 m) and mean
period (with thresholds of 8,10,12,15 seconds) are defined in the
ECMWF local table 2 version 131 (Event probabilities) and are as in
Table 7.2:
Table 7.2 Wave EPS Event Probability
Products
(ECMWF Local Code
Table 2, parameter table, Version Number 131)
|
FIELD CODE
|
MARS ABBREV.
|
FIELD NAME
|
UNITS
|
NO. OF BITS/VAL.
|
|
74
|
SWHG2
|
Significant wave
height of at least 2 m
|
%
|
8
|
|
75
|
SWHG4
|
Significant wave
height of at least 4 m
|
%
|
8
|
|
76
|
SWHG6
|
Significant wave
height of at least 6 m
|
%
|
8
|
|
77
|
SWHG8
|
Significant wave
height of at least 8 m
|
%
|
8
|
|
78
|
MWPG8
|
Mean wave period of
at least 8 s
|
%
|
8
|
|
79
|
MWPG10
|
Mean wave period of
at least 10 s
|
%
|
8
|
|
80
|
MWPG12
|
Mean wave period of
at least 12 s
|
%
|
8
|
|
81
|
MWPG15
|
Mean wave period of
at least 15 s
|
%
|
8
|
Event
Probability requirements
The following command
language parameters are specific for the event probability
requirements. Other DIS parameters are listed under the 7.2
above.
|
TYPE
|
=
|
EVENT
PROBABILITY
|
[EP]
|
|
NUMBER
|
=
|
OFF
|
|
STEP
|
=
|
* (hours)
12/to/360/by/12
and
120-168,168-240,120-240 and 240-360
|
|
PARAM
|
=
|
Field name
abbreviation
*
NB ALL is not
permitted.
Available
parameters are listed in the Table 7.2.
|
|
