Validation of sea ice concentration - American sector
Bulletin date: 2025-11-27
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-11-23:
| 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 |
21749 |
2022 |
189 |
349 |
33 |
0 |
0 |
0 |
| OW |
101 |
347 |
82 |
389 |
83 |
4 |
0 |
0 |
| VODI |
70 |
125 |
43 |
410 |
360 |
149 |
0 |
0 |
| ODI |
24 |
16 |
7 |
249 |
416 |
384 |
13 |
0 |
| CDI |
20 |
10 |
0 |
65 |
519 |
648 |
70 |
26 |
| VCDI |
11 |
9 |
3 |
12 |
239 |
2648 |
8282 |
21055 |
|
...date precedes bulletin
|
Date: 2025-11-25:
| 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 |
20275 |
3200 |
242 |
380 |
61 |
3 |
0 |
0 |
| OW |
11 |
248 |
141 |
551 |
64 |
18 |
0 |
0 |
| VODI |
3 |
25 |
19 |
640 |
244 |
27 |
0 |
0 |
| ODI |
0 |
2 |
2 |
129 |
586 |
139 |
7 |
0 |
| CDI |
0 |
0 |
0 |
23 |
561 |
913 |
82 |
0 |
| VCDI |
0 |
1 |
1 |
3 |
282 |
1927 |
5864 |
24557 |
|
...date precedes bulletin
|
Date: 2025-11-27:
| 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 |
20043 |
3109 |
212 |
297 |
44 |
0 |
0 |
0 |
| OW |
19 |
198 |
149 |
510 |
118 |
7 |
0 |
0 |
| VODI |
4 |
14 |
21 |
676 |
355 |
55 |
0 |
0 |
| ODI |
0 |
2 |
0 |
254 |
501 |
130 |
16 |
0 |
| CDI |
0 |
0 |
0 |
64 |
471 |
518 |
58 |
3 |
| VCDI |
0 |
0 |
0 |
11 |
290 |
2370 |
7307 |
23405 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
20033 |
3185 |
247 |
315 |
47 |
0 |
0 |
0 |
| OW |
29 |
128 |
110 |
515 |
109 |
13 |
0 |
0 |
| VODI |
4 |
10 |
25 |
662 |
355 |
59 |
1 |
0 |
| ODI |
0 |
0 |
0 |
238 |
546 |
131 |
22 |
0 |
| CDI |
0 |
0 |
0 |
66 |
434 |
553 |
47 |
4 |
| VCDI |
0 |
0 |
0 |
16 |
288 |
2324 |
7311 |
23404 |
|
Date: 2025-11-29:
| 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 |
19086 |
3342 |
209 |
258 |
42 |
4 |
0 |
0 |
| OW |
120 |
248 |
131 |
501 |
194 |
19 |
0 |
0 |
| VODI |
13 |
86 |
59 |
496 |
382 |
243 |
0 |
0 |
| ODI |
0 |
18 |
4 |
268 |
401 |
299 |
9 |
0 |
| CDI |
0 |
7 |
2 |
115 |
479 |
536 |
80 |
8 |
| VCDI |
0 |
0 |
0 |
17 |
261 |
2791 |
11131 |
19372 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
19079 |
3403 |
239 |
309 |
72 |
4 |
0 |
0 |
| OW |
119 |
202 |
110 |
446 |
182 |
21 |
0 |
0 |
| VODI |
21 |
76 |
51 |
531 |
401 |
239 |
0 |
0 |
| ODI |
0 |
15 |
3 |
237 |
409 |
319 |
13 |
0 |
| CDI |
0 |
5 |
2 |
109 |
439 |
555 |
65 |
11 |
| VCDI |
0 |
0 |
0 |
23 |
256 |
2754 |
11142 |
19369 |
|
Date: 2025-12-01:
| 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 |
15434 |
6003 |
236 |
272 |
7 |
0 |
0 |
0 |
| OW |
113 |
308 |
89 |
602 |
88 |
2 |
0 |
0 |
| VODI |
3 |
57 |
17 |
605 |
377 |
6 |
0 |
0 |
| ODI |
0 |
1 |
0 |
144 |
758 |
81 |
1 |
0 |
| CDI |
0 |
0 |
0 |
30 |
632 |
938 |
35 |
19 |
| VCDI |
0 |
0 |
0 |
3 |
136 |
3078 |
10203 |
20953 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
15418 |
5881 |
197 |
370 |
61 |
2 |
0 |
0 |
| OW |
109 |
361 |
108 |
490 |
251 |
17 |
0 |
0 |
| VODI |
23 |
110 |
34 |
542 |
643 |
248 |
0 |
0 |
| ODI |
0 |
15 |
3 |
187 |
477 |
302 |
3 |
0 |
| CDI |
0 |
2 |
0 |
59 |
319 |
575 |
60 |
33 |
| VCDI |
0 |
0 |
0 |
8 |
247 |
2961 |
10176 |
20939 |
|
Date: 2025-12-03:
| 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 |
13112 |
6947 |
288 |
498 |
4 |
0 |
0 |
0 |
| OW |
29 |
330 |
92 |
684 |
123 |
0 |
0 |
0 |
| VODI |
8 |
115 |
42 |
387 |
598 |
12 |
0 |
0 |
| ODI |
0 |
11 |
6 |
126 |
759 |
157 |
0 |
0 |
| CDI |
0 |
0 |
2 |
108 |
638 |
519 |
33 |
6 |
| VCDI |
0 |
0 |
0 |
40 |
368 |
2439 |
10276 |
22474 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13103 |
6875 |
253 |
532 |
24 |
0 |
0 |
0 |
| OW |
36 |
360 |
113 |
561 |
225 |
1 |
0 |
0 |
| VODI |
6 |
136 |
52 |
406 |
710 |
152 |
0 |
0 |
| ODI |
4 |
29 |
10 |
210 |
733 |
317 |
9 |
0 |
| CDI |
0 |
3 |
2 |
109 |
438 |
503 |
78 |
8 |
| VCDI |
0 |
0 |
0 |
25 |
360 |
2154 |
10222 |
22472 |
|
Date: 2025-12-05:
| 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 |
11975 |
6897 |
239 |
518 |
19 |
0 |
0 |
0 |
| OW |
62 |
517 |
75 |
503 |
218 |
89 |
0 |
0 |
| VODI |
1 |
186 |
44 |
385 |
409 |
211 |
0 |
0 |
| ODI |
0 |
27 |
6 |
152 |
578 |
306 |
0 |
0 |
| CDI |
0 |
13 |
0 |
40 |
599 |
759 |
7 |
2 |
| VCDI |
0 |
3 |
0 |
10 |
470 |
2466 |
6514 |
26931 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11694 |
6629 |
221 |
489 |
53 |
0 |
0 |
0 |
| OW |
340 |
769 |
91 |
447 |
137 |
36 |
0 |
0 |
| VODI |
4 |
199 |
49 |
467 |
405 |
254 |
3 |
1 |
| ODI |
0 |
25 |
3 |
157 |
520 |
550 |
9 |
11 |
| CDI |
0 |
14 |
0 |
41 |
618 |
690 |
35 |
99 |
| VCDI |
0 |
7 |
0 |
7 |
560 |
2301 |
6474 |
26822 |
|
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