Validation of sea ice concentration
 Bulletin date: 2020-04-23
 Model vs. observations, sea ice class contingency tables
 Date: 2020-04-17:
 | Best estimate | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 11564 | 6098 | 1820 | 716 | 345 | 169 | 57 | 0 |  
| OW | 0 | 0 | 130 | 126 | 147 | 104 | 63 | 0 |  
| VODI | 0 | 0 | 55 | 123 | 221 | 229 | 160 | 0 |  
| ODI | 0 | 0 | 7 | 72 | 148 | 193 | 314 | 4 |  
| CDI | 0 | 0 | 1 | 51 | 92 | 237 | 918 | 36 |  
| VCDI | 0 | 0 | 0 | 28 | 76 | 277 | 8824 | 4754 |  | ...date precedes bulletin | 
 Date: 2020-04-21:
 | Best estimate | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 11656 | 6395 | 1406 | 676 | 358 | 258 | 45 | 0 |  
| OW | 0 | 2 | 181 | 178 | 173 | 158 | 72 | 0 |  
| VODI | 0 | 0 | 83 | 195 | 212 | 264 | 217 | 0 |  
| ODI | 0 | 0 | 26 | 119 | 200 | 239 | 503 | 10 |  
| CDI | 0 | 0 | 2 | 72 | 139 | 299 | 1406 | 10 |  
| VCDI | 0 | 0 | 0 | 45 | 52 | 165 | 7754 | 4589 |  | ...date precedes bulletin | 
 Date: 2020-04-23:
 | Best estimate | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 11909 | 6198 | 942 | 1088 | 448 | 162 | 33 | 0 |  
| OW | 0 | 20 | 166 | 257 | 197 | 105 | 85 | 0 |  
| VODI | 0 | 5 | 48 | 217 | 214 | 203 | 226 | 0 |  
| ODI | 0 | 7 | 3 | 162 | 139 | 222 | 432 | 1 |  
| CDI | 0 | 0 | 0 | 96 | 177 | 343 | 1395 | 6 |  
| VCDI | 0 | 0 | 0 | 94 | 128 | 324 | 7490 | 4617 |  | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 11908 | 6199 | 973 | 1099 | 463 | 162 | 57 | 0 |  
| OW | 1 | 18 | 122 | 227 | 184 | 104 | 71 | 0 |  
| VODI | 0 | 5 | 57 | 221 | 200 | 192 | 194 | 0 |  
| ODI | 0 | 8 | 7 | 166 | 143 | 222 | 439 | 0 |  
| CDI | 0 | 0 | 0 | 105 | 181 | 364 | 1322 | 3 |  
| VCDI | 0 | 0 | 0 | 96 | 132 | 315 | 7578 | 4621 |  | 
 Date: 2020-04-27:
 | Best estimate | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 11531 | 6384 | 810 | 1292 | 655 | 149 | 30 | 0 |  
| OW | 8 | 27 | 123 | 262 | 200 | 129 | 72 | 30 |  
| VODI | 3 | 8 | 79 | 242 | 222 | 223 | 127 | 142 |  
| ODI | 0 | 5 | 14 | 99 | 231 | 421 | 304 | 179 |  
| CDI | 0 | 0 | 9 | 60 | 154 | 858 | 852 | 214 |  
| VCDI | 0 | 0 | 22 | 62 | 103 | 796 | 6296 | 4732 |  | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 11522 | 6377 | 852 | 1353 | 762 | 273 | 72 | 0 |  
| OW | 17 | 32 | 62 | 196 | 135 | 123 | 62 | 44 |  
| VODI | 1 | 7 | 42 | 186 | 149 | 214 | 155 | 144 |  
| ODI | 2 | 8 | 35 | 100 | 141 | 252 | 295 | 203 |  
| CDI | 0 | 0 | 29 | 72 | 220 | 838 | 675 | 179 |  
| VCDI | 0 | 0 | 37 | 110 | 158 | 876 | 6422 | 4727 |  | 
 Date: 2020-04-29:
 | Best estimate | Forecast | 
 | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 11561 | 5976 | 1234 | 1046 | 909 | 335 | 53 | 0 |  
| OW | 2 | 9 | 78 | 227 | 220 | 251 | 59 | 0 |  
| VODI | 3 | 10 | 30 | 186 | 173 | 348 | 203 | 0 |  
| ODI | 0 | 2 | 4 | 109 | 148 | 503 | 493 | 9 |  
| CDI | 0 | 0 | 0 | 48 | 130 | 781 | 1321 | 23 |  
| VCDI | 0 | 0 | 0 | 56 | 45 | 585 | 6693 | 4296 |  | 
|  | observations |  
|  | Ice free | Ice free near MIZ
 | OW | VODI | ODI | CDI | VCDI near MIZ
 | VCDI |  
| m o
 d
 e
 l
 | Ice free | 11556 | 5975 | 1285 | 1123 | 985 | 443 | 76 | 0 |  
| OW | 7 | 9 | 46 | 135 | 132 | 175 | 87 | 0 |  
| VODI | 3 | 5 | 10 | 112 | 137 | 302 | 225 | 0 |  
| ODI | 0 | 8 | 4 | 107 | 129 | 332 | 475 | 10 |  
| CDI | 0 | 0 | 1 | 105 | 165 | 839 | 1106 | 20 |  
| VCDI | 0 | 0 | 0 | 90 | 77 | 712 | 6853 | 4298 |  | 
 Date: 2020-05-01:
 | Best estimate | Forecast | 
 | ...observations not yet available | ...observations not yet available | 
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