Validation of sea ice concentration - European sector
 Bulletin date: 2025-09-16
 Data source: OSI SAF N.H. sea ice concentration
 Model vs. observations, sea ice class contingency tables
 Date: 2025-09-16:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 46241 | 2429 | 0 | 5 | 1 | 0 | 0 | 0 |  
| OW | 1 | 143 | 3 | 11 | 4 | 0 | 0 | 0 |  
| VODI | 0 | 362 | 13 | 40 | 48 | 5 | 0 | 0 |  
| ODI | 0 | 297 | 24 | 263 | 119 | 30 | 24 | 0 |  
| CDI | 0 | 18 | 5 | 155 | 402 | 934 | 240 | 0 |  
| VCDI | 0 | 0 | 0 | 9 | 95 | 2549 | 2125 | 35 |  | 
 Date: 2025-09-18:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 46021 | 2903 | 9 | 62 | 34 | 27 | 0 | 0 |  
| OW | 0 | 81 | 3 | 14 | 10 | 13 | 0 | 0 |  
| VODI | 0 | 129 | 4 | 41 | 19 | 41 | 0 | 0 |  
| ODI | 0 | 129 | 12 | 113 | 79 | 37 | 12 | 0 |  
| CDI | 0 | 14 | 1 | 87 | 286 | 391 | 298 | 24 |  
| VCDI | 0 | 1 | 0 | 9 | 60 | 2009 | 3229 | 428 |  | 
 Date: 2025-09-20:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 45799 | 3011 | 16 | 118 | 75 | 8 | 0 | 0 |  
| OW | 0 | 40 | 1 | 20 | 14 | 9 | 0 | 0 |  
| VODI | 0 | 87 | 0 | 34 | 30 | 14 | 0 | 0 |  
| ODI | 0 | 74 | 1 | 77 | 102 | 25 | 13 | 6 |  
| CDI | 0 | 10 | 1 | 55 | 281 | 323 | 250 | 53 |  
| VCDI | 0 | 2 | 0 | 15 | 161 | 2792 | 2496 | 617 |  | 
 Date: 2025-09-22:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 45938 | 2893 | 16 | 119 | 93 | 48 | 7 | 0 |  
| OW | 0 | 37 | 2 | 6 | 7 | 6 | 1 | 0 |  
| VODI | 0 | 74 | 0 | 14 | 12 | 12 | 3 | 0 |  
| ODI | 0 | 154 | 1 | 27 | 22 | 21 | 18 | 5 |  
| CDI | 0 | 109 | 12 | 72 | 104 | 96 | 370 | 56 |  
| VCDI | 0 | 33 | 4 | 108 | 326 | 905 | 4332 | 567 |  | 
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