Validation of sea ice concentration - European sector
 Bulletin date: 2025-08-26
 Data source: OSI SAF N.H. sea ice concentration
 Model vs. observations, sea ice class contingency tables
 Date: 2025-08-26:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 45618 | 3437 | 2 | 31 | 3 | 0 | 0 | 0 |  
| OW | 9 | 115 | 4 | 27 | 6 | 0 | 1 | 0 |  
| VODI | 7 | 235 | 17 | 145 | 98 | 39 | 2 | 0 |  
| ODI | 0 | 138 | 21 | 232 | 662 | 431 | 90 | 0 |  
| CDI | 0 | 20 | 2 | 101 | 1379 | 1714 | 470 | 0 |  
| VCDI | 0 | 1 | 1 | 6 | 399 | 795 | 372 | 0 |  | 
 Date: 2025-08-28:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 45594 | 3775 | 12 | 169 | 30 | 2 | 0 | 0 |  
| OW | 0 | 56 | 3 | 27 | 7 | 5 | 1 | 0 |  
| VODI | 0 | 70 | 8 | 101 | 87 | 52 | 7 | 0 |  
| ODI | 0 | 70 | 15 | 162 | 603 | 473 | 76 | 0 |  
| CDI | 0 | 25 | 3 | 92 | 1462 | 1857 | 361 | 0 |  
| VCDI | 0 | 0 | 0 | 8 | 475 | 746 | 196 | 0 |  | 
 Date: 2025-08-30:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 45713 | 3783 | 30 | 223 | 54 | 3 | 0 | 0 |  
| OW | 0 | 38 | 3 | 31 | 23 | 3 | 0 | 0 |  
| VODI | 0 | 48 | 6 | 80 | 100 | 41 | 11 | 0 |  
| ODI | 0 | 68 | 10 | 152 | 547 | 376 | 124 | 0 |  
| CDI | 0 | 11 | 2 | 161 | 1607 | 1701 | 509 | 0 |  
| VCDI | 0 | 0 | 0 | 11 | 428 | 545 | 188 | 0 |  | 
 Date: 2025-09-01:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 46172 | 3472 | 34 | 289 | 85 | 11 | 0 | 0 |  
| OW | 0 | 32 | 1 | 37 | 16 | 3 | 0 | 0 |  
| VODI | 0 | 30 | 1 | 92 | 91 | 22 | 18 | 0 |  
| ODI | 0 | 32 | 6 | 138 | 520 | 366 | 129 | 0 |  
| CDI | 0 | 14 | 3 | 253 | 1539 | 1384 | 650 | 0 |  
| VCDI | 0 | 1 | 0 | 64 | 515 | 366 | 244 | 0 |  | 
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