Validation of sea ice concentration - American sector
Bulletin date: 2025-08-14
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-08-08:
| 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 |
11402 |
4184 |
116 |
66 |
6 |
0 |
0 |
0 |
| OW |
24 |
1418 |
468 |
484 |
64 |
1 |
0 |
0 |
| VODI |
0 |
311 |
508 |
3200 |
1066 |
215 |
0 |
0 |
| ODI |
0 |
13 |
13 |
576 |
3582 |
658 |
114 |
0 |
| CDI |
0 |
4 |
10 |
38 |
1291 |
7794 |
3157 |
0 |
| VCDI |
0 |
1 |
4 |
4 |
14 |
131 |
3329 |
1600 |
|
...date precedes bulletin
|
Date: 2025-08-10:
| 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 |
11648 |
3936 |
88 |
31 |
4 |
0 |
0 |
0 |
| OW |
15 |
1636 |
472 |
505 |
28 |
0 |
0 |
0 |
| VODI |
0 |
383 |
503 |
3887 |
902 |
26 |
5 |
0 |
| ODI |
0 |
18 |
9 |
614 |
3302 |
1099 |
83 |
0 |
| CDI |
0 |
4 |
10 |
24 |
849 |
7489 |
3101 |
1 |
| VCDI |
0 |
4 |
3 |
2 |
17 |
780 |
4298 |
90 |
|
...date precedes bulletin
|
Date: 2025-08-12:
| 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 |
12039 |
4352 |
123 |
33 |
6 |
0 |
0 |
0 |
| OW |
3 |
1810 |
788 |
489 |
9 |
0 |
0 |
0 |
| VODI |
0 |
205 |
471 |
3536 |
593 |
5 |
0 |
0 |
| ODI |
0 |
5 |
2 |
355 |
4097 |
770 |
0 |
0 |
| CDI |
0 |
5 |
3 |
7 |
560 |
7403 |
1494 |
0 |
| VCDI |
0 |
4 |
2 |
2 |
38 |
1779 |
4878 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-14:
| 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 |
12016 |
4378 |
94 |
37 |
7 |
0 |
0 |
0 |
| OW |
5 |
2329 |
657 |
355 |
7 |
2 |
0 |
0 |
| VODI |
0 |
418 |
706 |
3463 |
389 |
10 |
0 |
0 |
| ODI |
0 |
5 |
5 |
582 |
4431 |
469 |
2 |
0 |
| CDI |
0 |
2 |
2 |
15 |
1853 |
6069 |
986 |
0 |
| VCDI |
0 |
4 |
2 |
2 |
60 |
1694 |
4260 |
550 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12017 |
4353 |
105 |
40 |
6 |
0 |
0 |
0 |
| OW |
4 |
2386 |
663 |
380 |
12 |
4 |
0 |
0 |
| VODI |
0 |
386 |
685 |
3378 |
501 |
5 |
0 |
0 |
| ODI |
0 |
5 |
9 |
638 |
4285 |
468 |
3 |
0 |
| CDI |
0 |
1 |
2 |
15 |
1876 |
6182 |
1112 |
0 |
| VCDI |
0 |
5 |
2 |
3 |
67 |
1585 |
4133 |
550 |
|
Date: 2025-08-16:
| 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 |
12072 |
4197 |
95 |
36 |
3 |
0 |
0 |
0 |
| OW |
7 |
2820 |
486 |
229 |
15 |
2 |
0 |
0 |
| VODI |
0 |
679 |
713 |
3480 |
430 |
10 |
0 |
0 |
| ODI |
0 |
17 |
21 |
730 |
4260 |
341 |
1 |
0 |
| CDI |
0 |
2 |
2 |
49 |
2241 |
5195 |
1006 |
0 |
| VCDI |
0 |
3 |
1 |
1 |
57 |
989 |
5126 |
550 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12074 |
4177 |
98 |
48 |
5 |
0 |
0 |
0 |
| OW |
5 |
2910 |
477 |
207 |
15 |
2 |
0 |
0 |
| VODI |
0 |
602 |
707 |
3400 |
654 |
13 |
0 |
0 |
| ODI |
0 |
24 |
33 |
807 |
3903 |
415 |
6 |
0 |
| CDI |
0 |
2 |
2 |
62 |
2347 |
5248 |
1350 |
0 |
| VCDI |
0 |
3 |
1 |
1 |
82 |
859 |
4777 |
550 |
|
Date: 2025-08-18:
| 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 |
12889 |
4485 |
71 |
24 |
1 |
0 |
0 |
0 |
| OW |
4 |
2963 |
1157 |
599 |
7 |
1 |
0 |
0 |
| VODI |
0 |
22 |
179 |
3473 |
565 |
2 |
0 |
0 |
| ODI |
0 |
0 |
1 |
219 |
5038 |
355 |
1 |
0 |
| CDI |
0 |
2 |
3 |
27 |
1078 |
6022 |
98 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
33 |
915 |
5192 |
440 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12883 |
3335 |
68 |
36 |
4 |
1 |
0 |
0 |
| OW |
10 |
3203 |
400 |
250 |
22 |
2 |
1 |
0 |
| VODI |
0 |
903 |
900 |
2986 |
749 |
30 |
1 |
0 |
| ODI |
0 |
29 |
38 |
980 |
3997 |
466 |
1 |
0 |
| CDI |
0 |
1 |
5 |
88 |
1870 |
5447 |
904 |
0 |
| VCDI |
0 |
1 |
0 |
2 |
80 |
1349 |
4384 |
440 |
|
Date: 2025-08-20:
| 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 |
13300 |
4159 |
30 |
12 |
0 |
0 |
0 |
0 |
| OW |
70 |
3840 |
738 |
341 |
1 |
0 |
0 |
0 |
| VODI |
15 |
328 |
597 |
2883 |
479 |
2 |
0 |
0 |
| ODI |
0 |
2 |
12 |
642 |
4581 |
614 |
0 |
0 |
| CDI |
0 |
6 |
7 |
73 |
1167 |
5322 |
532 |
0 |
| VCDI |
0 |
2 |
3 |
9 |
30 |
2426 |
3643 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13193 |
3083 |
38 |
29 |
1 |
0 |
0 |
0 |
| OW |
169 |
3477 |
264 |
179 |
10 |
2 |
0 |
0 |
| VODI |
23 |
1710 |
970 |
2341 |
663 |
12 |
0 |
0 |
| ODI |
0 |
56 |
94 |
1239 |
3884 |
629 |
0 |
0 |
| CDI |
0 |
7 |
16 |
160 |
1635 |
5263 |
749 |
0 |
| VCDI |
0 |
4 |
5 |
12 |
65 |
2458 |
3426 |
0 |
|
Date: 2025-08-22:
| 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 |
13476 |
4118 |
24 |
8 |
0 |
0 |
0 |
0 |
| OW |
151 |
4080 |
736 |
292 |
3 |
0 |
0 |
0 |
| VODI |
8 |
421 |
690 |
2585 |
568 |
3 |
0 |
0 |
| ODI |
0 |
6 |
21 |
914 |
4292 |
919 |
0 |
0 |
| CDI |
0 |
11 |
14 |
100 |
1223 |
5110 |
575 |
0 |
| VCDI |
0 |
4 |
4 |
11 |
24 |
2316 |
3159 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13311 |
2847 |
29 |
35 |
1 |
0 |
0 |
0 |
| OW |
282 |
3613 |
298 |
178 |
14 |
1 |
0 |
0 |
| VODI |
42 |
2041 |
1012 |
1913 |
776 |
11 |
0 |
0 |
| ODI |
0 |
124 |
123 |
1604 |
3624 |
646 |
0 |
0 |
| CDI |
0 |
10 |
23 |
166 |
1650 |
5392 |
851 |
0 |
| VCDI |
0 |
5 |
4 |
14 |
45 |
2298 |
2883 |
0 |
|
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