Validation of sea ice concentration - European sector
 Bulletin date: 2025-04-29
 Data source: OSI SAF N.H. sea ice concentration
 Model vs. observations, sea ice class contingency tables
 Date: 2025-04-29:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 17055 | 14083 | 111 | 751 | 231 | 16 | 0 | 0 |  
| OW | 20 | 269 | 13 | 148 | 58 | 11 | 0 | 0 |  
| VODI | 25 | 444 | 15 | 339 | 194 | 38 | 13 | 0 |  
| ODI | 0 | 254 | 22 | 505 | 450 | 447 | 213 | 3 |  
| CDI | 0 | 87 | 11 | 438 | 1045 | 1342 | 1114 | 181 |  
| VCDI | 0 | 23 | 6 | 188 | 912 | 3045 | 7148 | 5400 |  | 
 Date: 2025-05-01:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 17686 | 13968 | 123 | 1083 | 317 | 34 | 2 | 0 |  
| OW | 1 | 87 | 14 | 162 | 71 | 16 | 1 | 0 |  
| VODI | 0 | 150 | 17 | 357 | 220 | 90 | 18 | 0 |  
| ODI | 0 | 134 | 11 | 445 | 434 | 568 | 280 | 6 |  
| CDI | 0 | 43 | 8 | 337 | 912 | 1613 | 1288 | 175 |  
| VCDI | 0 | 46 | 4 | 176 | 928 | 3053 | 6307 | 5483 |  | 
 Date: 2025-05-03:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 17945 | 13943 | 159 | 1115 | 322 | 30 | 0 | 0 |  
| OW | 5 | 68 | 8 | 143 | 86 | 18 | 0 | 0 |  
| VODI | 8 | 100 | 16 | 247 | 260 | 97 | 16 | 1 |  
| ODI | 10 | 79 | 14 | 401 | 485 | 621 | 253 | 13 |  
| CDI | 14 | 53 | 9 | 347 | 1069 | 1709 | 1194 | 142 |  
| VCDI | 30 | 27 | 4 | 280 | 1054 | 2936 | 6421 | 4916 |  | 
 Date: 2025-05-05:
 | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 17747 | 14072 | 143 | 1334 | 357 | 54 | 0 | 0 |  
| OW | 6 | 61 | 5 | 154 | 120 | 32 | 0 | 0 |  
| VODI | 5 | 83 | 13 | 288 | 303 | 164 | 18 | 1 |  
| ODI | 1 | 66 | 12 | 346 | 718 | 673 | 197 | 28 |  
| CDI | 9 | 31 | 13 | 346 | 1242 | 1800 | 1010 | 219 |  
| VCDI | 29 | 11 | 3 | 217 | 931 | 3431 | 6102 | 4273 |  | 
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