Validation of sea ice concentration - American sector
 Bulletin date: 2025-09-02
 Data source: OSI SAF N.H. sea ice concentration
 Model vs. observations, sea ice class contingency tables
 Date: 2025-09-02:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 14599 | 3302 | 4 | 14 | 3 | 0 | 0 | 0 |  
| OW | 186 | 905 | 2 | 32 | 5 | 2 | 0 | 0 |  
| VODI | 222 | 1836 | 30 | 213 | 71 | 55 | 5 | 0 |  
| ODI | 173 | 3093 | 109 | 1114 | 1007 | 469 | 46 | 0 |  
| CDI | 13 | 824 | 72 | 1293 | 3164 | 3206 | 285 | 0 |  
| VCDI | 0 | 3 | 0 | 99 | 2077 | 5785 | 1239 | 0 |  | 
 Date: 2025-09-04:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 15277 | 5330 | 30 | 177 | 13 | 0 | 0 | 0 |  
| OW | 38 | 602 | 10 | 67 | 20 | 0 | 0 | 0 |  
| VODI | 71 | 1088 | 17 | 231 | 77 | 47 | 8 | 0 |  
| ODI | 110 | 2092 | 82 | 1088 | 771 | 454 | 66 | 0 |  
| CDI | 19 | 657 | 49 | 1466 | 2887 | 3020 | 562 | 0 |  
| VCDI | 0 | 9 | 1 | 114 | 2049 | 5022 | 1936 | 0 |  | 
 Date: 2025-09-06:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 15188 | 6491 | 46 | 373 | 69 | 6 | 0 | 0 |  
| OW | 15 | 398 | 4 | 76 | 12 | 0 | 0 | 0 |  
| VODI | 34 | 759 | 18 | 187 | 67 | 26 | 2 | 0 |  
| ODI | 75 | 1849 | 70 | 971 | 627 | 367 | 36 | 0 |  
| CDI | 10 | 690 | 58 | 1435 | 2439 | 3104 | 315 | 0 |  
| VCDI | 0 | 26 | 3 | 231 | 1907 | 6598 | 975 | 0 |  | 
 Date: 2025-09-08:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 15132 | 7296 | 81 | 428 | 69 | 8 | 0 | 0 |  
| OW | 14 | 297 | 1 | 54 | 6 | 1 | 0 | 0 |  
| VODI | 27 | 616 | 13 | 140 | 30 | 13 | 7 | 0 |  
| ODI | 55 | 1590 | 69 | 748 | 428 | 331 | 30 | 0 |  
| CDI | 7 | 634 | 52 | 1513 | 2302 | 2681 | 270 | 0 |  
| VCDI | 0 | 65 | 9 | 366 | 1801 | 7181 | 1192 | 0 |  | 
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