Validation of sea ice concentration - American sector
Bulletin date: 2025-11-13
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-11-07:
| 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 |
23864 |
3492 |
342 |
630 |
60 |
0 |
0 |
0 |
| OW |
34 |
197 |
122 |
869 |
403 |
50 |
0 |
0 |
| VODI |
8 |
20 |
43 |
461 |
585 |
105 |
0 |
0 |
| ODI |
0 |
0 |
0 |
195 |
447 |
143 |
4 |
0 |
| CDI |
0 |
0 |
0 |
50 |
486 |
406 |
83 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
452 |
1632 |
8644 |
17401 |
|
...date precedes bulletin
|
Date: 2025-11-09:
| 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 |
23689 |
3076 |
215 |
471 |
42 |
0 |
0 |
0 |
| OW |
39 |
324 |
111 |
721 |
492 |
62 |
0 |
0 |
| VODI |
8 |
124 |
54 |
542 |
580 |
174 |
15 |
0 |
| ODI |
1 |
17 |
24 |
191 |
480 |
205 |
24 |
0 |
| CDI |
0 |
2 |
8 |
79 |
477 |
505 |
118 |
0 |
| VCDI |
0 |
0 |
0 |
46 |
220 |
1534 |
7678 |
18883 |
|
...date precedes bulletin
|
Date: 2025-11-11:
| 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 |
23644 |
2893 |
202 |
337 |
41 |
0 |
0 |
0 |
| OW |
37 |
293 |
108 |
583 |
197 |
0 |
0 |
0 |
| VODI |
19 |
79 |
49 |
488 |
748 |
58 |
0 |
0 |
| ODI |
1 |
2 |
3 |
81 |
898 |
435 |
0 |
0 |
| CDI |
0 |
0 |
0 |
39 |
373 |
814 |
46 |
5 |
| VCDI |
0 |
0 |
0 |
19 |
100 |
1280 |
6610 |
20749 |
|
...date precedes bulletin
|
Date: 2025-11-13:
| 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 |
23660 |
2543 |
243 |
446 |
17 |
0 |
0 |
0 |
| OW |
47 |
404 |
102 |
363 |
113 |
1 |
0 |
0 |
| VODI |
10 |
175 |
57 |
453 |
560 |
65 |
0 |
0 |
| ODI |
1 |
23 |
4 |
114 |
553 |
313 |
0 |
0 |
| CDI |
0 |
12 |
2 |
44 |
349 |
1104 |
74 |
0 |
| VCDI |
0 |
15 |
1 |
20 |
201 |
1479 |
8857 |
18806 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
23661 |
2526 |
241 |
427 |
36 |
0 |
0 |
0 |
| OW |
44 |
414 |
106 |
361 |
95 |
1 |
0 |
0 |
| VODI |
11 |
170 |
53 |
485 |
557 |
62 |
0 |
0 |
| ODI |
2 |
35 |
6 |
103 |
535 |
342 |
1 |
0 |
| CDI |
0 |
13 |
2 |
44 |
361 |
1084 |
99 |
1 |
| VCDI |
0 |
14 |
1 |
20 |
209 |
1473 |
8831 |
18805 |
|
Date: 2025-11-15:
| 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 |
23268 |
2559 |
286 |
385 |
2 |
0 |
0 |
0 |
| OW |
74 |
295 |
68 |
535 |
165 |
0 |
0 |
0 |
| VODI |
12 |
51 |
64 |
533 |
468 |
46 |
0 |
0 |
| ODI |
0 |
4 |
0 |
102 |
268 |
241 |
21 |
0 |
| CDI |
1 |
0 |
0 |
39 |
250 |
861 |
118 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
202 |
1938 |
10539 |
17835 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
23258 |
2538 |
279 |
413 |
36 |
0 |
0 |
0 |
| OW |
78 |
318 |
90 |
475 |
145 |
0 |
0 |
0 |
| VODI |
18 |
46 |
49 |
558 |
442 |
51 |
0 |
0 |
| ODI |
1 |
7 |
0 |
115 |
292 |
212 |
13 |
0 |
| CDI |
0 |
0 |
0 |
31 |
252 |
756 |
132 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
188 |
2067 |
10533 |
17835 |
|
Date: 2025-11-17:
| 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 |
20941 |
4460 |
305 |
255 |
1 |
0 |
0 |
0 |
| OW |
4 |
191 |
141 |
719 |
21 |
0 |
0 |
0 |
| VODI |
6 |
27 |
8 |
509 |
529 |
1 |
0 |
0 |
| ODI |
1 |
0 |
0 |
42 |
727 |
66 |
5 |
0 |
| CDI |
0 |
0 |
0 |
20 |
412 |
971 |
82 |
0 |
| VCDI |
0 |
0 |
0 |
6 |
193 |
2040 |
9878 |
18670 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
20939 |
4308 |
261 |
336 |
22 |
0 |
0 |
0 |
| OW |
5 |
311 |
159 |
494 |
173 |
0 |
0 |
0 |
| VODI |
7 |
52 |
34 |
560 |
596 |
49 |
0 |
0 |
| ODI |
1 |
7 |
0 |
120 |
458 |
160 |
0 |
0 |
| CDI |
0 |
0 |
0 |
37 |
333 |
441 |
57 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
301 |
2428 |
9908 |
18670 |
|
Date: 2025-11-19:
| 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 |
21768 |
3019 |
218 |
266 |
3 |
0 |
0 |
0 |
| OW |
15 |
235 |
102 |
525 |
118 |
0 |
0 |
0 |
| VODI |
3 |
126 |
25 |
547 |
538 |
76 |
0 |
0 |
| ODI |
0 |
25 |
3 |
113 |
497 |
309 |
1 |
0 |
| CDI |
0 |
0 |
0 |
29 |
315 |
813 |
33 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
100 |
2720 |
10021 |
18664 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
21763 |
2943 |
195 |
386 |
50 |
0 |
0 |
0 |
| OW |
14 |
372 |
118 |
386 |
108 |
25 |
0 |
0 |
| VODI |
9 |
70 |
26 |
537 |
535 |
162 |
0 |
0 |
| ODI |
0 |
20 |
9 |
133 |
518 |
373 |
0 |
0 |
| CDI |
0 |
0 |
0 |
41 |
299 |
662 |
25 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
61 |
2696 |
10030 |
18664 |
|
Date: 2025-11-21:
| 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 |
21394 |
3075 |
206 |
175 |
3 |
0 |
0 |
0 |
| OW |
20 |
379 |
106 |
401 |
76 |
0 |
0 |
0 |
| VODI |
4 |
199 |
106 |
561 |
411 |
38 |
0 |
0 |
| ODI |
1 |
44 |
14 |
257 |
501 |
190 |
2 |
0 |
| CDI |
9 |
1 |
0 |
97 |
605 |
473 |
22 |
0 |
| VCDI |
10 |
0 |
0 |
1 |
381 |
2653 |
9472 |
19344 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
21392 |
3052 |
186 |
317 |
111 |
34 |
0 |
0 |
| OW |
9 |
442 |
142 |
298 |
42 |
19 |
0 |
0 |
| VODI |
17 |
188 |
87 |
545 |
385 |
132 |
2 |
0 |
| ODI |
4 |
16 |
16 |
229 |
520 |
278 |
14 |
0 |
| CDI |
8 |
0 |
1 |
98 |
577 |
519 |
38 |
0 |
| VCDI |
8 |
0 |
0 |
5 |
342 |
2372 |
9442 |
19344 |
|
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