Validation of sea ice concentration - American 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 | 16174 | 4150 | 1 | 12 | 0 | 0 | 0 | 0 |  
| OW | 228 | 548 | 3 | 17 | 7 | 0 | 0 | 0 |  
| VODI | 536 | 1558 | 29 | 191 | 65 | 29 | 8 | 0 |  
| ODI | 440 | 2154 | 84 | 872 | 397 | 361 | 90 | 0 |  
| CDI | 17 | 195 | 37 | 1206 | 2427 | 1660 | 680 | 0 |  
| VCDI | 0 | 5 | 0 | 59 | 729 | 4276 | 6312 | 0 |  | 
 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 | 15745 | 6174 | 91 | 64 | 9 | 0 | 0 | 0 |  
| OW | 140 | 514 | 54 | 72 | 12 | 0 | 0 | 0 |  
| VODI | 277 | 1113 | 134 | 358 | 84 | 11 | 0 | 0 |  
| ODI | 196 | 1003 | 325 | 911 | 392 | 227 | 44 | 0 |  
| CDI | 3 | 59 | 49 | 1036 | 2293 | 1613 | 567 | 32 |  
| VCDI | 0 | 1 | 0 | 96 | 921 | 3787 | 6517 | 633 |  | 
 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 | 16551 | 6402 | 32 | 146 | 18 | 0 | 0 | 0 |  
| OW | 96 | 443 | 9 | 86 | 12 | 2 | 0 | 0 |  
| VODI | 164 | 856 | 44 | 169 | 59 | 60 | 3 | 0 |  
| ODI | 138 | 1031 | 57 | 722 | 310 | 198 | 26 | 0 |  
| CDI | 0 | 134 | 16 | 493 | 1122 | 1550 | 399 | 76 |  
| VCDI | 0 | 25 | 2 | 81 | 761 | 5156 | 6576 | 1532 |  | 
 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 | 16423 | 6801 | 124 | 182 | 65 | 13 | 0 | 0 |  
| OW | 40 | 322 | 26 | 85 | 40 | 22 | 0 | 0 |  
| VODI | 84 | 553 | 43 | 161 | 116 | 77 | 3 | 0 |  
| ODI | 82 | 844 | 103 | 396 | 378 | 201 | 21 | 0 |  
| CDI | 1 | 165 | 65 | 409 | 828 | 1067 | 230 | 40 |  
| VCDI | 0 | 39 | 17 | 157 | 701 | 5483 | 7118 | 2032 |  | 
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