Validation of sea ice concentration
Bulletin date: 2025-05-29
Model vs. observations, sea ice class contingency tables
Date: 2025-05-23:
| 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 |
58778 |
20748 |
5388 |
705 |
167 |
32 |
28 |
0 |
| OW |
9 |
354 |
2460 |
3796 |
1435 |
438 |
175 |
0 |
| VODI |
2 |
34 |
479 |
3025 |
2862 |
2860 |
1067 |
7 |
| ODI |
3 |
0 |
55 |
979 |
1099 |
4549 |
4972 |
55 |
| CDI |
0 |
0 |
17 |
249 |
327 |
1804 |
17774 |
445 |
| VCDI |
0 |
0 |
0 |
95 |
38 |
114 |
5560 |
15860 |
|
...date precedes bulletin
|
Date: 2025-05-27:
| 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 |
62976 |
20818 |
5805 |
776 |
149 |
31 |
60 |
0 |
| OW |
4 |
221 |
1906 |
3093 |
1747 |
343 |
305 |
0 |
| VODI |
3 |
13 |
411 |
2306 |
3426 |
1948 |
800 |
0 |
| ODI |
1 |
4 |
87 |
635 |
1370 |
4829 |
3564 |
0 |
| CDI |
0 |
0 |
31 |
293 |
288 |
2498 |
13915 |
182 |
| VCDI |
0 |
0 |
0 |
73 |
34 |
39 |
9053 |
14807 |
|
...date precedes bulletin
|
Date: 2025-05-29:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
Date: 2025-06-02:
| 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 |
67161 |
20528 |
4053 |
1327 |
307 |
55 |
53 |
0 |
| OW |
5 |
243 |
1895 |
3641 |
2034 |
379 |
253 |
0 |
| VODI |
0 |
5 |
310 |
2072 |
3626 |
2590 |
709 |
8 |
| ODI |
0 |
4 |
23 |
524 |
1274 |
5622 |
3552 |
57 |
| CDI |
0 |
0 |
3 |
303 |
322 |
1601 |
13342 |
1820 |
| VCDI |
0 |
0 |
0 |
2 |
12 |
117 |
8475 |
10537 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
67161 |
20290 |
2925 |
639 |
224 |
54 |
53 |
0 |
| OW |
5 |
468 |
2736 |
3605 |
1602 |
562 |
241 |
1 |
| VODI |
0 |
14 |
575 |
2366 |
3657 |
2341 |
847 |
23 |
| ODI |
0 |
5 |
37 |
827 |
1570 |
4635 |
3511 |
69 |
| CDI |
0 |
3 |
11 |
317 |
460 |
2618 |
13661 |
2802 |
| VCDI |
0 |
0 |
0 |
115 |
62 |
154 |
8071 |
9527 |
|
Date: 2025-06-04:
| 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 |
68677 |
19395 |
5062 |
1267 |
323 |
67 |
84 |
0 |
| OW |
4 |
237 |
2092 |
3526 |
1935 |
299 |
444 |
0 |
| VODI |
0 |
19 |
508 |
1671 |
3413 |
2118 |
1471 |
11 |
| ODI |
0 |
5 |
88 |
462 |
1120 |
2834 |
4877 |
37 |
| CDI |
0 |
0 |
16 |
370 |
371 |
1093 |
15176 |
5623 |
| VCDI |
0 |
0 |
0 |
2 |
12 |
129 |
7566 |
6440 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
68677 |
19226 |
3553 |
522 |
170 |
70 |
84 |
0 |
| OW |
4 |
385 |
3461 |
3211 |
1814 |
484 |
426 |
1 |
| VODI |
0 |
30 |
639 |
2384 |
3023 |
1696 |
1670 |
13 |
| ODI |
0 |
14 |
88 |
682 |
1492 |
2543 |
5058 |
41 |
| CDI |
0 |
1 |
25 |
367 |
610 |
1561 |
15143 |
6839 |
| VCDI |
0 |
0 |
0 |
132 |
65 |
186 |
7237 |
5217 |
|
Date: 2025-06-06:
| 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 |
70643 |
19644 |
4995 |
1122 |
151 |
34 |
116 |
0 |
| OW |
0 |
353 |
3294 |
3796 |
762 |
178 |
313 |
4 |
| VODI |
0 |
7 |
685 |
2489 |
3018 |
1703 |
1017 |
40 |
| ODI |
0 |
0 |
41 |
637 |
1376 |
3294 |
3509 |
109 |
| CDI |
0 |
0 |
0 |
155 |
284 |
955 |
14097 |
6503 |
| VCDI |
0 |
0 |
0 |
103 |
35 |
13 |
4425 |
8944 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
70643 |
18927 |
3273 |
648 |
132 |
68 |
117 |
0 |
| OW |
0 |
1054 |
3789 |
3178 |
1061 |
448 |
425 |
6 |
| VODI |
0 |
23 |
1702 |
2668 |
1719 |
1713 |
1329 |
42 |
| ODI |
0 |
0 |
239 |
1144 |
1794 |
2167 |
3468 |
99 |
| CDI |
0 |
0 |
12 |
542 |
865 |
1729 |
13542 |
7999 |
| VCDI |
0 |
0 |
0 |
122 |
55 |
52 |
4596 |
7454 |
|
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