Validation of sea ice concentration - American sector
Bulletin date: 2025-11-06
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-10-31:
| 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 |
25527 |
3709 |
284 |
424 |
79 |
0 |
0 |
0 |
| OW |
0 |
155 |
137 |
626 |
117 |
0 |
0 |
0 |
| VODI |
3 |
5 |
19 |
420 |
342 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
137 |
529 |
97 |
1 |
0 |
| CDI |
0 |
0 |
0 |
18 |
512 |
629 |
72 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
67 |
1383 |
8245 |
17693 |
|
...date precedes bulletin
|
Date: 2025-11-02:
| 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 |
25391 |
3641 |
242 |
563 |
27 |
0 |
0 |
0 |
| OW |
22 |
325 |
165 |
469 |
139 |
0 |
0 |
0 |
| VODI |
4 |
52 |
63 |
447 |
367 |
10 |
0 |
0 |
| ODI |
0 |
2 |
18 |
213 |
407 |
68 |
0 |
0 |
| CDI |
0 |
0 |
0 |
100 |
532 |
348 |
16 |
2 |
| VCDI |
0 |
0 |
0 |
15 |
256 |
1651 |
6729 |
18947 |
|
...date precedes bulletin
|
Date: 2025-11-04:
| 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 |
24415 |
4038 |
417 |
748 |
44 |
0 |
0 |
0 |
| OW |
37 |
348 |
214 |
608 |
160 |
0 |
0 |
0 |
| VODI |
10 |
15 |
25 |
501 |
394 |
4 |
0 |
0 |
| ODI |
0 |
0 |
0 |
155 |
512 |
62 |
0 |
0 |
| CDI |
0 |
0 |
0 |
29 |
477 |
460 |
24 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
155 |
1875 |
8583 |
16920 |
|
...date precedes bulletin
|
Date: 2025-11-06:
| 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 |
24013 |
3555 |
342 |
774 |
51 |
2 |
0 |
0 |
| OW |
29 |
205 |
128 |
774 |
486 |
9 |
0 |
0 |
| VODI |
8 |
17 |
41 |
393 |
669 |
56 |
0 |
0 |
| ODI |
0 |
0 |
0 |
160 |
470 |
116 |
0 |
0 |
| CDI |
0 |
0 |
0 |
35 |
450 |
362 |
49 |
0 |
| VCDI |
0 |
0 |
0 |
5 |
397 |
1869 |
8174 |
17592 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
24015 |
3563 |
355 |
906 |
128 |
8 |
0 |
0 |
| OW |
26 |
183 |
125 |
583 |
368 |
11 |
0 |
0 |
| VODI |
9 |
31 |
31 |
447 |
640 |
47 |
0 |
0 |
| ODI |
0 |
0 |
0 |
166 |
450 |
119 |
1 |
0 |
| CDI |
0 |
0 |
0 |
36 |
514 |
346 |
49 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
423 |
1883 |
8173 |
17592 |
|
Date: 2025-11-08:
| 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 |
23742 |
3344 |
292 |
492 |
49 |
0 |
0 |
0 |
| OW |
41 |
224 |
134 |
826 |
465 |
65 |
0 |
0 |
| VODI |
12 |
76 |
52 |
558 |
492 |
172 |
0 |
0 |
| ODI |
0 |
1 |
9 |
205 |
452 |
170 |
12 |
0 |
| CDI |
0 |
0 |
0 |
73 |
461 |
473 |
117 |
1 |
| VCDI |
0 |
0 |
0 |
16 |
312 |
1776 |
7627 |
18490 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
23726 |
3425 |
328 |
698 |
82 |
18 |
0 |
0 |
| OW |
55 |
150 |
102 |
594 |
413 |
48 |
0 |
0 |
| VODI |
14 |
70 |
57 |
514 |
447 |
153 |
0 |
0 |
| ODI |
0 |
0 |
0 |
253 |
401 |
186 |
15 |
0 |
| CDI |
0 |
0 |
0 |
103 |
555 |
467 |
124 |
1 |
| VCDI |
0 |
0 |
0 |
8 |
333 |
1784 |
7617 |
18490 |
|
Date: 2025-11-10:
| 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 |
23635 |
2947 |
266 |
393 |
25 |
0 |
0 |
0 |
| OW |
34 |
306 |
178 |
702 |
115 |
0 |
0 |
0 |
| VODI |
13 |
39 |
45 |
538 |
898 |
23 |
0 |
0 |
| ODI |
0 |
1 |
0 |
68 |
1100 |
238 |
0 |
0 |
| CDI |
0 |
0 |
0 |
38 |
348 |
767 |
51 |
3 |
| VCDI |
0 |
0 |
0 |
16 |
80 |
1319 |
6683 |
20362 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
23603 |
2907 |
296 |
608 |
88 |
9 |
0 |
0 |
| OW |
53 |
275 |
84 |
471 |
528 |
53 |
0 |
0 |
| VODI |
25 |
98 |
78 |
410 |
594 |
169 |
0 |
0 |
| ODI |
1 |
11 |
20 |
142 |
454 |
230 |
29 |
0 |
| CDI |
0 |
2 |
10 |
83 |
603 |
478 |
131 |
5 |
| VCDI |
0 |
0 |
1 |
41 |
299 |
1408 |
6574 |
20360 |
|
Date: 2025-11-12:
| 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 |
23653 |
2796 |
203 |
329 |
17 |
0 |
0 |
0 |
| OW |
36 |
377 |
126 |
372 |
201 |
13 |
0 |
0 |
| VODI |
15 |
129 |
57 |
522 |
437 |
94 |
0 |
0 |
| ODI |
4 |
7 |
10 |
221 |
688 |
470 |
0 |
0 |
| CDI |
0 |
5 |
1 |
59 |
326 |
939 |
35 |
2 |
| VCDI |
0 |
4 |
0 |
27 |
138 |
1551 |
7366 |
20001 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
23583 |
2691 |
179 |
341 |
121 |
3 |
0 |
0 |
| OW |
92 |
298 |
103 |
271 |
319 |
82 |
0 |
0 |
| VODI |
28 |
222 |
63 |
508 |
489 |
300 |
5 |
0 |
| ODI |
5 |
90 |
30 |
238 |
264 |
347 |
18 |
0 |
| CDI |
0 |
16 |
15 |
110 |
437 |
718 |
101 |
5 |
| VCDI |
0 |
1 |
7 |
62 |
177 |
1617 |
7277 |
19998 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
23314 |
2340 |
215 |
581 |
119 |
0 |
0 |
0 |
| OW |
122 |
326 |
32 |
162 |
206 |
158 |
2 |
0 |
| VODI |
47 |
350 |
87 |
324 |
288 |
489 |
27 |
0 |
| ODI |
4 |
117 |
41 |
273 |
166 |
517 |
74 |
0 |
| CDI |
0 |
35 |
16 |
101 |
130 |
754 |
250 |
0 |
| VCDI |
0 |
18 |
24 |
91 |
215 |
1697 |
9548 |
17971 |
|
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