Validation of sea ice concentration - European 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 | 45885 | 2702 | 0 | 5 | 4 | 1 | 0 | 0 |  
| OW | 0 | 97 | 2 | 11 | 5 | 4 | 0 | 0 |  
| VODI | 0 | 219 | 2 | 32 | 27 | 6 | 0 | 0 |  
| ODI | 0 | 268 | 8 | 98 | 46 | 43 | 24 | 0 |  
| CDI | 0 | 66 | 12 | 129 | 205 | 191 | 281 | 2 |  
| VCDI | 0 | 7 | 1 | 65 | 282 | 977 | 4726 | 197 |  | 
 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 | 45963 | 2906 | 8 | 36 | 42 | 7 | 0 | 0 |  
| OW | 0 | 90 | 3 | 20 | 24 | 8 | 0 | 0 |  
| VODI | 0 | 100 | 4 | 34 | 27 | 18 | 0 | 0 |  
| ODI | 0 | 146 | 1 | 75 | 47 | 26 | 10 | 0 |  
| CDI | 0 | 70 | 6 | 94 | 149 | 262 | 292 | 3 |  
| VCDI | 0 | 11 | 3 | 57 | 278 | 1352 | 4302 | 156 |  | 
 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 | 45946 | 3077 | 15 | 80 | 67 | 33 | 3 | 0 |  
| OW | 0 | 45 | 3 | 25 | 24 | 7 | 2 | 0 |  
| VODI | 0 | 55 | 3 | 31 | 29 | 15 | 0 | 0 |  
| ODI | 0 | 87 | 4 | 49 | 54 | 20 | 18 | 0 |  
| CDI | 0 | 87 | 7 | 93 | 138 | 300 | 347 | 0 |  
| VCDI | 0 | 8 | 2 | 51 | 270 | 1560 | 4060 | 15 |  | 
 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 | 45711 | 3190 | 23 | 183 | 134 | 29 | 25 | 0 |  
| OW | 0 | 26 | 2 | 29 | 9 | 7 | 1 | 0 |  
| VODI | 0 | 37 | 3 | 48 | 29 | 15 | 4 | 0 |  
| ODI | 0 | 22 | 1 | 47 | 63 | 23 | 7 | 0 |  
| CDI | 0 | 37 | 2 | 44 | 141 | 303 | 356 | 4 |  
| VCDI | 0 | 11 | 0 | 16 | 130 | 1355 | 4496 | 67 |  | 
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