Validation of sea ice concentration - American sector
Bulletin date: 2025-12-04
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-11-28:
| 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 |
19512 |
3385 |
185 |
257 |
26 |
0 |
0 |
0 |
| OW |
41 |
315 |
130 |
438 |
119 |
0 |
0 |
0 |
| VODI |
5 |
74 |
61 |
559 |
402 |
121 |
0 |
0 |
| ODI |
0 |
32 |
5 |
289 |
444 |
202 |
2 |
0 |
| CDI |
0 |
4 |
1 |
102 |
496 |
389 |
50 |
0 |
| VCDI |
0 |
0 |
0 |
26 |
295 |
2912 |
9882 |
20470 |
|
...date precedes bulletin
|
Date: 2025-11-30:
| 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 |
16059 |
5741 |
165 |
382 |
55 |
4 |
0 |
0 |
| OW |
128 |
323 |
78 |
523 |
236 |
43 |
0 |
0 |
| VODI |
18 |
113 |
49 |
539 |
425 |
299 |
0 |
0 |
| ODI |
0 |
15 |
11 |
257 |
369 |
309 |
2 |
0 |
| CDI |
0 |
0 |
0 |
114 |
417 |
568 |
81 |
16 |
| VCDI |
0 |
0 |
0 |
33 |
259 |
2935 |
9976 |
20689 |
|
...date precedes bulletin
|
Date: 2025-12-02:
| 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 |
15122 |
5762 |
288 |
300 |
1 |
0 |
0 |
0 |
| OW |
26 |
420 |
98 |
553 |
128 |
0 |
0 |
0 |
| VODI |
3 |
97 |
17 |
469 |
494 |
5 |
0 |
0 |
| ODI |
0 |
2 |
2 |
124 |
715 |
136 |
1 |
0 |
| CDI |
0 |
0 |
0 |
80 |
705 |
584 |
50 |
13 |
| VCDI |
0 |
0 |
0 |
10 |
271 |
2770 |
11661 |
20324 |
|
...date precedes bulletin
|
Date: 2025-12-04:
| 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 |
12847 |
6568 |
245 |
472 |
2 |
0 |
0 |
0 |
| OW |
63 |
462 |
142 |
626 |
142 |
6 |
0 |
0 |
| VODI |
3 |
122 |
57 |
438 |
513 |
69 |
0 |
0 |
| ODI |
0 |
13 |
6 |
192 |
686 |
217 |
0 |
0 |
| CDI |
0 |
6 |
1 |
97 |
555 |
613 |
3 |
2 |
| VCDI |
0 |
0 |
0 |
51 |
329 |
2579 |
7471 |
25633 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12837 |
6663 |
273 |
586 |
21 |
0 |
0 |
0 |
| OW |
73 |
380 |
111 |
515 |
178 |
16 |
0 |
0 |
| VODI |
3 |
113 |
65 |
451 |
477 |
79 |
0 |
0 |
| ODI |
0 |
12 |
1 |
198 |
683 |
232 |
0 |
0 |
| CDI |
0 |
3 |
1 |
71 |
559 |
624 |
1 |
2 |
| VCDI |
0 |
0 |
0 |
55 |
309 |
2533 |
7473 |
25633 |
|
Date: 2025-12-06:
| 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 |
12461 |
6127 |
232 |
420 |
52 |
0 |
0 |
0 |
| OW |
109 |
647 |
94 |
381 |
218 |
23 |
0 |
0 |
| VODI |
4 |
295 |
81 |
360 |
361 |
201 |
0 |
0 |
| ODI |
0 |
50 |
19 |
187 |
420 |
280 |
0 |
0 |
| CDI |
0 |
26 |
23 |
99 |
567 |
832 |
21 |
0 |
| VCDI |
0 |
2 |
1 |
36 |
408 |
2737 |
6457 |
27000 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12436 |
6181 |
232 |
461 |
64 |
0 |
0 |
0 |
| OW |
132 |
585 |
90 |
346 |
230 |
64 |
0 |
0 |
| VODI |
6 |
295 |
88 |
387 |
367 |
190 |
0 |
0 |
| ODI |
0 |
61 |
27 |
177 |
430 |
332 |
0 |
0 |
| CDI |
0 |
25 |
13 |
77 |
544 |
785 |
20 |
0 |
| VCDI |
0 |
0 |
0 |
35 |
391 |
2702 |
6458 |
27000 |
|
Date: 2025-12-08:
| 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 |
11045 |
6729 |
299 |
668 |
49 |
0 |
0 |
0 |
| OW |
214 |
532 |
69 |
401 |
171 |
0 |
0 |
0 |
| VODI |
33 |
234 |
74 |
326 |
448 |
50 |
0 |
0 |
| ODI |
0 |
66 |
31 |
271 |
526 |
153 |
2 |
0 |
| CDI |
0 |
17 |
4 |
54 |
606 |
411 |
35 |
11 |
| VCDI |
0 |
4 |
4 |
58 |
968 |
3174 |
6435 |
27059 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11030 |
6308 |
265 |
546 |
53 |
0 |
0 |
0 |
| OW |
214 |
778 |
83 |
446 |
143 |
0 |
0 |
0 |
| VODI |
48 |
363 |
87 |
367 |
443 |
49 |
0 |
0 |
| ODI |
0 |
117 |
37 |
301 |
586 |
151 |
2 |
0 |
| CDI |
0 |
14 |
5 |
68 |
598 |
402 |
26 |
7 |
| VCDI |
0 |
2 |
4 |
50 |
945 |
3186 |
6444 |
27063 |
|
Date: 2025-12-10:
| 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 |
11134 |
6511 |
278 |
363 |
28 |
0 |
0 |
0 |
| OW |
175 |
506 |
124 |
436 |
64 |
0 |
0 |
0 |
| VODI |
23 |
141 |
90 |
461 |
253 |
6 |
0 |
0 |
| ODI |
0 |
15 |
11 |
242 |
625 |
48 |
0 |
0 |
| CDI |
0 |
10 |
2 |
61 |
578 |
748 |
59 |
0 |
| VCDI |
0 |
2 |
0 |
50 |
365 |
3592 |
6471 |
27759 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11095 |
5694 |
235 |
421 |
71 |
0 |
0 |
0 |
| OW |
178 |
779 |
88 |
363 |
140 |
0 |
0 |
0 |
| VODI |
48 |
476 |
98 |
362 |
373 |
3 |
0 |
0 |
| ODI |
11 |
213 |
66 |
336 |
558 |
197 |
1 |
0 |
| CDI |
0 |
23 |
17 |
102 |
404 |
646 |
31 |
13 |
| VCDI |
0 |
0 |
1 |
29 |
367 |
3548 |
6498 |
27746 |
|
Date: 2025-12-12:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
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