Validation of sea ice concentration - American sector
Bulletin date: 2025-10-30
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-10-24:
| 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 |
26905 |
3851 |
261 |
499 |
14 |
0 |
0 |
0 |
| OW |
0 |
199 |
90 |
378 |
142 |
9 |
0 |
0 |
| VODI |
3 |
39 |
61 |
282 |
374 |
64 |
0 |
0 |
| ODI |
0 |
2 |
3 |
148 |
259 |
175 |
19 |
0 |
| CDI |
0 |
0 |
0 |
79 |
463 |
678 |
179 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
120 |
3379 |
10360 |
12194 |
|
...date precedes bulletin
|
Date: 2025-10-26:
| 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 |
26735 |
3252 |
285 |
523 |
68 |
1 |
0 |
0 |
| OW |
13 |
126 |
83 |
397 |
180 |
21 |
1 |
0 |
| VODI |
3 |
27 |
18 |
277 |
478 |
54 |
12 |
0 |
| ODI |
0 |
8 |
1 |
71 |
359 |
202 |
6 |
0 |
| CDI |
0 |
0 |
0 |
18 |
401 |
780 |
120 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
186 |
3297 |
12426 |
10802 |
|
...date precedes bulletin
|
Date: 2025-10-28:
| 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 |
26630 |
3117 |
244 |
565 |
54 |
0 |
0 |
0 |
| OW |
2 |
92 |
90 |
515 |
147 |
0 |
0 |
0 |
| VODI |
3 |
5 |
3 |
350 |
468 |
23 |
2 |
0 |
| ODI |
0 |
1 |
0 |
26 |
562 |
345 |
53 |
0 |
| CDI |
0 |
0 |
0 |
4 |
204 |
1148 |
175 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
30 |
1885 |
11966 |
12522 |
|
...date precedes bulletin
|
Date: 2025-10-30:
| 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 |
25746 |
3448 |
231 |
562 |
195 |
0 |
0 |
0 |
| OW |
0 |
73 |
85 |
536 |
252 |
6 |
0 |
0 |
| VODI |
3 |
1 |
11 |
312 |
457 |
28 |
0 |
0 |
| ODI |
0 |
0 |
0 |
107 |
481 |
230 |
7 |
0 |
| CDI |
0 |
0 |
0 |
12 |
291 |
886 |
231 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
27 |
1749 |
9526 |
15738 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
25746 |
3444 |
242 |
577 |
219 |
1 |
0 |
0 |
| OW |
0 |
75 |
74 |
474 |
240 |
3 |
0 |
0 |
| VODI |
3 |
3 |
11 |
360 |
421 |
29 |
0 |
0 |
| ODI |
0 |
0 |
0 |
108 |
506 |
227 |
20 |
0 |
| CDI |
0 |
0 |
0 |
10 |
298 |
874 |
190 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
19 |
1765 |
9554 |
15738 |
|
Date: 2025-11-01:
| 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 |
25599 |
3592 |
321 |
365 |
20 |
0 |
0 |
0 |
| OW |
5 |
364 |
131 |
456 |
169 |
0 |
0 |
0 |
| VODI |
3 |
48 |
69 |
416 |
312 |
13 |
0 |
0 |
| ODI |
0 |
0 |
7 |
216 |
422 |
81 |
1 |
0 |
| CDI |
0 |
0 |
0 |
67 |
605 |
410 |
18 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
165 |
1497 |
7581 |
18278 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
25600 |
3571 |
308 |
385 |
46 |
0 |
0 |
0 |
| OW |
4 |
319 |
151 |
452 |
198 |
0 |
0 |
0 |
| VODI |
3 |
114 |
61 |
408 |
261 |
8 |
0 |
0 |
| ODI |
0 |
0 |
8 |
216 |
410 |
82 |
1 |
0 |
| CDI |
0 |
0 |
0 |
55 |
614 |
394 |
32 |
1 |
| VCDI |
0 |
0 |
0 |
4 |
164 |
1517 |
7567 |
18277 |
|
Date: 2025-11-03:
| 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 |
25002 |
3879 |
286 |
526 |
31 |
0 |
0 |
0 |
| OW |
34 |
333 |
236 |
694 |
179 |
0 |
0 |
0 |
| VODI |
4 |
11 |
12 |
473 |
440 |
9 |
0 |
0 |
| ODI |
0 |
0 |
0 |
69 |
718 |
117 |
0 |
0 |
| CDI |
0 |
0 |
0 |
18 |
299 |
503 |
172 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
68 |
1366 |
7362 |
18389 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
24985 |
3738 |
267 |
735 |
90 |
0 |
0 |
0 |
| OW |
43 |
373 |
135 |
315 |
273 |
2 |
0 |
0 |
| VODI |
12 |
92 |
92 |
334 |
437 |
62 |
0 |
0 |
| ODI |
0 |
18 |
23 |
211 |
330 |
90 |
3 |
0 |
| CDI |
0 |
2 |
17 |
119 |
344 |
356 |
42 |
0 |
| VCDI |
0 |
0 |
0 |
67 |
261 |
1485 |
7489 |
18389 |
|
Date: 2025-11-05:
| 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 |
24201 |
3813 |
374 |
673 |
161 |
0 |
0 |
0 |
| OW |
25 |
272 |
166 |
723 |
355 |
0 |
0 |
0 |
| VODI |
7 |
24 |
42 |
417 |
549 |
8 |
0 |
0 |
| ODI |
1 |
3 |
6 |
178 |
446 |
55 |
0 |
0 |
| CDI |
0 |
0 |
0 |
63 |
411 |
442 |
11 |
0 |
| VCDI |
0 |
0 |
0 |
10 |
335 |
2082 |
8555 |
16823 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
24136 |
3731 |
358 |
753 |
245 |
0 |
0 |
0 |
| OW |
62 |
298 |
118 |
518 |
320 |
0 |
0 |
0 |
| VODI |
31 |
82 |
95 |
408 |
525 |
26 |
0 |
0 |
| ODI |
5 |
1 |
15 |
231 |
386 |
124 |
0 |
0 |
| CDI |
0 |
0 |
2 |
130 |
394 |
383 |
18 |
0 |
| VCDI |
0 |
0 |
0 |
24 |
387 |
2054 |
8548 |
16823 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
23756 |
3390 |
286 |
635 |
130 |
0 |
0 |
0 |
| OW |
116 |
245 |
141 |
852 |
312 |
21 |
0 |
0 |
| VODI |
28 |
59 |
58 |
422 |
645 |
154 |
11 |
0 |
| ODI |
5 |
12 |
14 |
154 |
479 |
220 |
19 |
0 |
| CDI |
1 |
3 |
8 |
107 |
361 |
297 |
99 |
0 |
| VCDI |
0 |
0 |
0 |
38 |
506 |
1644 |
8602 |
17401 |
|
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