Validation of sea ice concentration - European sector
 Bulletin date: 2025-10-07
 Data source: OSI SAF N.H. sea ice concentration
 Model vs. observations, sea ice class contingency tables
 Date: 2025-10-07:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 45758 | 3039 | 0 | 0 | 0 | 0 | 0 | 0 |  
| OW | 11 | 89 | 0 | 3 | 0 | 0 | 0 | 0 |  
| VODI | 5 | 171 | 1 | 28 | 10 | 0 | 0 | 0 |  
| ODI | 0 | 211 | 15 | 104 | 66 | 3 | 1 | 0 |  
| CDI | 0 | 67 | 9 | 66 | 129 | 244 | 81 | 0 |  
| VCDI | 0 | 11 | 3 | 56 | 283 | 3431 | 2735 | 0 |  | 
 Date: 2025-10-09:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 45725 | 3421 | 2 | 12 | 4 | 0 | 0 | 0 |  
| OW | 0 | 88 | 0 | 10 | 2 | 0 | 0 | 0 |  
| VODI | 0 | 175 | 5 | 21 | 8 | 1 | 0 | 0 |  
| ODI | 0 | 176 | 14 | 87 | 39 | 38 | 10 | 0 |  
| CDI | 0 | 63 | 3 | 94 | 98 | 333 | 271 | 0 |  
| VCDI | 0 | 13 | 2 | 66 | 227 | 2433 | 3189 | 0 |  | 
 Date: 2025-10-11:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 44792 | 3972 | 28 | 130 | 21 | 0 | 0 | 0 |  
| OW | 0 | 54 | 3 | 37 | 12 | 0 | 0 | 0 |  
| VODI | 0 | 85 | 4 | 80 | 39 | 6 | 0 | 0 |  
| ODI | 0 | 44 | 7 | 88 | 96 | 20 | 3 | 0 |  
| CDI | 0 | 37 | 3 | 95 | 155 | 122 | 214 | 0 |  
| VCDI | 0 | 0 | 0 | 21 | 132 | 1721 | 4600 | 9 |  | 
 Date: 2025-10-13:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 44459 | 3903 | 10 | 125 | 209 | 9 | 0 | 0 |  
| OW | 0 | 44 | 5 | 12 | 22 | 8 | 0 | 0 |  
| VODI | 0 | 119 | 5 | 23 | 14 | 24 | 0 | 0 |  
| ODI | 0 | 89 | 7 | 45 | 35 | 51 | 13 | 0 |  
| CDI | 0 | 116 | 15 | 99 | 81 | 196 | 294 | 0 |  
| VCDI | 0 | 37 | 3 | 119 | 229 | 1911 | 4087 | 212 |  | 
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