Validation of sea ice concentration - American sector
 Bulletin date: 2025-09-23
 Data source: OSI SAF N.H. sea ice concentration
 Model vs. observations, sea ice class contingency tables
 Date: 2025-09-23:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 16512 | 4494 | 1 | 7 | 0 | 0 | 0 | 0 |  
| OW | 79 | 416 | 5 | 15 | 1 | 0 | 0 | 0 |  
| VODI | 333 | 1290 | 25 | 130 | 42 | 38 | 7 | 0 |  
| ODI | 253 | 2160 | 71 | 703 | 448 | 254 | 61 | 0 |  
| CDI | 3 | 89 | 17 | 428 | 1033 | 1414 | 646 | 0 |  
| VCDI | 0 | 2 | 0 | 37 | 498 | 3666 | 8977 | 1402 |  | 
 Date: 2025-09-25:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 16262 | 5704 | 9 | 48 | 9 | 0 | 0 | 0 |  
| OW | 31 | 494 | 5 | 19 | 9 | 0 | 0 | 0 |  
| VODI | 60 | 1141 | 17 | 103 | 24 | 7 | 0 | 0 |  
| ODI | 14 | 1577 | 63 | 650 | 418 | 235 | 26 | 0 |  
| CDI | 0 | 79 | 8 | 462 | 877 | 1407 | 739 | 13 |  
| VCDI | 0 | 1 | 0 | 46 | 361 | 3117 | 9051 | 2471 |  | 
 Date: 2025-09-27:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 16003 | 5587 | 16 | 66 | 3 | 1 | 0 | 0 |  
| OW | 4 | 717 | 2 | 32 | 3 | 4 | 0 | 0 |  
| VODI | 6 | 1083 | 29 | 125 | 22 | 7 | 1 | 0 |  
| ODI | 3 | 1452 | 48 | 474 | 303 | 217 | 65 | 2 |  
| CDI | 0 | 100 | 11 | 254 | 695 | 1076 | 1162 | 150 |  
| VCDI | 0 | 6 | 0 | 20 | 193 | 1864 | 9242 | 4509 |  | 
 Date: 2025-09-29:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 15309 | 5099 | 23 | 103 | 52 | 2 | 0 | 0 |  
| OW | 0 | 604 | 5 | 40 | 11 | 1 | 0 | 0 |  
| VODI | 0 | 1079 | 22 | 178 | 60 | 16 | 0 | 0 |  
| ODI | 0 | 1046 | 36 | 736 | 308 | 81 | 25 | 0 |  
| CDI | 0 | 393 | 13 | 481 | 728 | 960 | 883 | 59 |  
| VCDI | 0 | 5 | 0 | 33 | 316 | 2029 | 12778 | 2043 |  | 
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