Validation of sea ice concentration - American sector
Bulletin date: 2025-11-20
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-11-14:
| 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 |
23406 |
2581 |
231 |
540 |
12 |
0 |
0 |
0 |
| OW |
69 |
401 |
59 |
410 |
157 |
0 |
0 |
0 |
| VODI |
11 |
176 |
106 |
390 |
362 |
118 |
0 |
0 |
| ODI |
1 |
12 |
12 |
111 |
282 |
375 |
0 |
0 |
| CDI |
0 |
10 |
6 |
53 |
160 |
983 |
103 |
0 |
| VCDI |
0 |
6 |
1 |
28 |
151 |
2139 |
9798 |
17971 |
|
...date precedes bulletin
|
Date: 2025-11-16:
| 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 |
21774 |
3805 |
291 |
276 |
7 |
0 |
0 |
0 |
| OW |
34 |
291 |
127 |
595 |
157 |
0 |
0 |
0 |
| VODI |
11 |
42 |
47 |
511 |
571 |
53 |
0 |
0 |
| ODI |
1 |
8 |
3 |
80 |
360 |
190 |
0 |
0 |
| CDI |
1 |
1 |
2 |
24 |
327 |
582 |
108 |
0 |
| VCDI |
0 |
0 |
0 |
6 |
302 |
2139 |
9886 |
18619 |
|
...date precedes bulletin
|
Date: 2025-11-18:
| 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 |
21769 |
3194 |
302 |
327 |
5 |
0 |
0 |
0 |
| OW |
8 |
190 |
86 |
656 |
123 |
0 |
0 |
0 |
| VODI |
4 |
72 |
4 |
408 |
713 |
20 |
0 |
0 |
| ODI |
0 |
6 |
1 |
52 |
531 |
252 |
2 |
0 |
| CDI |
0 |
0 |
0 |
13 |
264 |
941 |
57 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
124 |
2568 |
9458 |
19078 |
|
...date precedes bulletin
|
Date: 2025-11-20:
| 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 |
21641 |
3087 |
213 |
168 |
10 |
0 |
0 |
0 |
| OW |
30 |
315 |
138 |
380 |
104 |
2 |
0 |
0 |
| VODI |
3 |
201 |
71 |
533 |
418 |
53 |
0 |
0 |
| ODI |
0 |
45 |
17 |
226 |
444 |
238 |
1 |
0 |
| CDI |
0 |
2 |
1 |
86 |
418 |
649 |
46 |
0 |
| VCDI |
0 |
0 |
0 |
12 |
239 |
2604 |
11020 |
17816 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
21649 |
3107 |
224 |
208 |
8 |
0 |
0 |
0 |
| OW |
22 |
316 |
126 |
371 |
102 |
0 |
0 |
0 |
| VODI |
3 |
194 |
69 |
514 |
438 |
57 |
0 |
0 |
| ODI |
0 |
33 |
21 |
233 |
436 |
227 |
0 |
0 |
| CDI |
0 |
0 |
0 |
75 |
448 |
649 |
56 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
201 |
2613 |
11011 |
17816 |
|
Date: 2025-11-22:
| 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 |
21070 |
2960 |
242 |
269 |
18 |
0 |
0 |
0 |
| OW |
3 |
393 |
87 |
421 |
82 |
5 |
0 |
0 |
| VODI |
3 |
139 |
53 |
516 |
466 |
79 |
0 |
0 |
| ODI |
0 |
20 |
28 |
271 |
553 |
214 |
6 |
0 |
| CDI |
0 |
10 |
0 |
84 |
533 |
560 |
66 |
0 |
| VCDI |
0 |
6 |
0 |
3 |
320 |
2690 |
10499 |
18562 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
21070 |
3026 |
253 |
274 |
42 |
2 |
0 |
0 |
| OW |
3 |
331 |
88 |
455 |
62 |
7 |
0 |
0 |
| VODI |
3 |
139 |
45 |
512 |
447 |
72 |
0 |
0 |
| ODI |
0 |
19 |
24 |
247 |
574 |
228 |
3 |
0 |
| CDI |
0 |
7 |
0 |
74 |
528 |
590 |
38 |
0 |
| VCDI |
0 |
6 |
0 |
2 |
319 |
2649 |
10530 |
18562 |
|
Date: 2025-11-24:
| 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 |
20310 |
3266 |
226 |
354 |
62 |
0 |
0 |
0 |
| OW |
7 |
357 |
143 |
496 |
66 |
5 |
0 |
0 |
| VODI |
3 |
31 |
19 |
588 |
245 |
25 |
0 |
0 |
| ODI |
0 |
9 |
0 |
100 |
772 |
180 |
0 |
0 |
| CDI |
0 |
2 |
0 |
9 |
642 |
1044 |
66 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
196 |
2119 |
6524 |
23363 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
20315 |
3240 |
233 |
424 |
144 |
22 |
0 |
0 |
| OW |
2 |
272 |
75 |
371 |
104 |
32 |
0 |
0 |
| VODI |
3 |
120 |
66 |
448 |
366 |
137 |
6 |
0 |
| ODI |
0 |
21 |
12 |
229 |
465 |
276 |
18 |
0 |
| CDI |
0 |
10 |
2 |
68 |
592 |
660 |
97 |
0 |
| VCDI |
0 |
2 |
0 |
9 |
312 |
2246 |
6469 |
23363 |
|
Date: 2025-11-26:
| 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 |
20136 |
3183 |
217 |
401 |
48 |
13 |
0 |
0 |
| OW |
10 |
196 |
130 |
578 |
59 |
24 |
0 |
0 |
| VODI |
3 |
6 |
1 |
682 |
318 |
25 |
5 |
0 |
| ODI |
0 |
3 |
1 |
188 |
530 |
105 |
19 |
0 |
| CDI |
0 |
1 |
0 |
33 |
497 |
725 |
101 |
0 |
| VCDI |
0 |
0 |
0 |
15 |
259 |
2042 |
5849 |
24828 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
20135 |
3052 |
190 |
460 |
88 |
53 |
1 |
0 |
| OW |
11 |
228 |
89 |
502 |
133 |
12 |
13 |
0 |
| VODI |
3 |
81 |
38 |
586 |
395 |
56 |
23 |
0 |
| ODI |
0 |
18 |
26 |
224 |
435 |
224 |
29 |
0 |
| CDI |
0 |
6 |
6 |
101 |
379 |
615 |
184 |
0 |
| VCDI |
0 |
4 |
0 |
24 |
281 |
1974 |
5724 |
24828 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
19516 |
3277 |
166 |
298 |
90 |
0 |
0 |
0 |
| OW |
38 |
305 |
110 |
431 |
191 |
24 |
0 |
0 |
| VODI |
4 |
153 |
63 |
576 |
343 |
180 |
0 |
0 |
| ODI |
0 |
56 |
19 |
194 |
479 |
201 |
10 |
0 |
| CDI |
0 |
19 |
23 |
110 |
385 |
533 |
112 |
1 |
| VCDI |
0 |
0 |
1 |
62 |
294 |
2686 |
9812 |
20469 |
|
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