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.