Annex 5

Thresholds for ensemble forecast evaluation

 

 

The following thresholds are linked to the sport decision-making requirementsfor winter Olympics (Annex 6) and might be subjected to change in case of possible sport demands revision.

 

 

Thresholds for new snow:

Accumulation period [hrs]

Thresholds [cm]

1

6

12

24

1, 2

2, 5, 15

15, 30

15, 30

 

 

Thresholds for total precipitation:

Accumulation period [hrs]

Thresholds [mm of equivalent water]

3

6

 

12

24

 

48

72

 1, 5, 10, 15

 1, 5, 10, 15

 

1, 5, 10, 20, 50

1, 5, 10, 20, 50, 100

 

20, 50, 100, 150

20, 50, 100, 150

 

 

Thresholds for wind speed [m/s]: 3, 4, 5, 10, 11, 15, 17.

 

Thresholds for wind gust [m/s]: 4, 5, 10, 14, 15, 17.

 

Thresholds for T2m [°C]: -25, -20, -10, -5, 0, 5.

 

(Instantaneous) thresholds for visibility [meters]: 20, 30, 50, 100, 250, 500, 1000.

 

(Instantaneous) thresholds for the height of the zero isotherm [meters]: 50, 100, 200, 300, 400, 500, 1000, 2000.