Validation of sea ice concentration - American sector
Bulletin date: 2025-09-04
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-08-29:
| 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 |
15069 |
4447 |
54 |
16 |
0 |
0 |
0 |
0 |
| OW |
189 |
3951 |
586 |
508 |
27 |
0 |
0 |
0 |
| VODI |
1 |
222 |
328 |
1990 |
972 |
10 |
0 |
0 |
| ODI |
0 |
10 |
3 |
282 |
3196 |
623 |
0 |
0 |
| CDI |
0 |
11 |
1 |
19 |
1474 |
7630 |
320 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
22 |
3018 |
887 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-31:
| 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 |
14416 |
4589 |
57 |
29 |
0 |
0 |
0 |
0 |
| OW |
125 |
4554 |
400 |
325 |
26 |
1 |
0 |
0 |
| VODI |
1 |
325 |
427 |
2087 |
551 |
32 |
0 |
0 |
| ODI |
0 |
11 |
11 |
617 |
3288 |
268 |
0 |
0 |
| CDI |
0 |
14 |
2 |
20 |
2322 |
7440 |
456 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
17 |
2247 |
1208 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-02:
| 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 |
15498 |
6457 |
26 |
3 |
0 |
0 |
0 |
0 |
| OW |
59 |
2612 |
698 |
371 |
5 |
0 |
0 |
0 |
| VODI |
0 |
34 |
181 |
1951 |
750 |
1 |
0 |
0 |
| ODI |
0 |
8 |
1 |
336 |
4792 |
492 |
0 |
0 |
| CDI |
0 |
8 |
1 |
13 |
884 |
6971 |
495 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
4 |
2159 |
1056 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-04:
| 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 |
15844 |
6262 |
23 |
4 |
0 |
0 |
0 |
0 |
| OW |
29 |
2614 |
549 |
365 |
7 |
0 |
0 |
0 |
| VODI |
0 |
92 |
266 |
2204 |
604 |
13 |
0 |
0 |
| ODI |
0 |
12 |
3 |
506 |
4505 |
610 |
0 |
0 |
| CDI |
0 |
10 |
2 |
13 |
774 |
6335 |
1096 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
13 |
1635 |
1476 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
15830 |
6325 |
35 |
6 |
0 |
0 |
0 |
0 |
| OW |
43 |
2528 |
547 |
429 |
9 |
0 |
0 |
0 |
| VODI |
0 |
116 |
255 |
2241 |
726 |
11 |
0 |
0 |
| ODI |
0 |
11 |
4 |
400 |
4330 |
677 |
1 |
0 |
| CDI |
0 |
10 |
2 |
16 |
830 |
6406 |
1194 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
8 |
1499 |
1377 |
0 |
|
Date: 2025-09-06:
| 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 |
15717 |
6193 |
42 |
27 |
0 |
0 |
0 |
0 |
| OW |
35 |
2765 |
494 |
387 |
19 |
0 |
0 |
0 |
| VODI |
0 |
224 |
410 |
2124 |
608 |
47 |
0 |
0 |
| ODI |
0 |
22 |
11 |
659 |
3913 |
809 |
0 |
0 |
| CDI |
0 |
8 |
0 |
23 |
704 |
6884 |
517 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
15 |
2446 |
763 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
15711 |
6316 |
56 |
37 |
2 |
0 |
0 |
0 |
| OW |
41 |
2590 |
481 |
479 |
22 |
0 |
0 |
0 |
| VODI |
0 |
279 |
408 |
2155 |
732 |
46 |
0 |
0 |
| ODI |
0 |
20 |
11 |
521 |
3776 |
916 |
0 |
0 |
| CDI |
0 |
7 |
1 |
28 |
716 |
6765 |
529 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
11 |
2459 |
751 |
0 |
|
Date: 2025-09-08:
| 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 |
15792 |
6319 |
74 |
36 |
0 |
0 |
0 |
0 |
| OW |
71 |
2552 |
494 |
428 |
14 |
1 |
0 |
0 |
| VODI |
14 |
437 |
371 |
2062 |
677 |
48 |
2 |
0 |
| ODI |
0 |
21 |
25 |
592 |
3136 |
1058 |
0 |
0 |
| CDI |
0 |
11 |
4 |
70 |
869 |
6229 |
541 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
15 |
2988 |
911 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
15783 |
6258 |
68 |
33 |
0 |
0 |
0 |
0 |
| OW |
84 |
2601 |
489 |
474 |
20 |
0 |
0 |
0 |
| VODI |
10 |
449 |
383 |
2015 |
749 |
45 |
2 |
0 |
| ODI |
0 |
22 |
25 |
601 |
3173 |
1215 |
0 |
0 |
| CDI |
0 |
10 |
3 |
67 |
756 |
6198 |
541 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
13 |
2866 |
911 |
0 |
|
Date: 2025-09-10:
| 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 |
15167 |
7290 |
128 |
63 |
0 |
0 |
0 |
0 |
| OW |
73 |
2224 |
638 |
628 |
5 |
0 |
0 |
0 |
| VODI |
0 |
102 |
204 |
2299 |
616 |
12 |
0 |
0 |
| ODI |
0 |
5 |
7 |
556 |
2332 |
375 |
0 |
0 |
| CDI |
0 |
2 |
3 |
37 |
1843 |
5407 |
876 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
5 |
2866 |
2102 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
15124 |
5852 |
110 |
89 |
0 |
0 |
0 |
0 |
| OW |
116 |
3237 |
480 |
526 |
26 |
0 |
0 |
0 |
| VODI |
0 |
494 |
351 |
2068 |
628 |
34 |
2 |
0 |
| ODI |
0 |
27 |
27 |
854 |
3129 |
855 |
1 |
0 |
| CDI |
0 |
13 |
12 |
45 |
1011 |
4532 |
643 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
7 |
3239 |
2332 |
0 |
|
Date: 2025-09-12:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
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