Validation of sea ice concentration - American sector
Bulletin date: 2025-08-21
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-08-15:
| 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 |
28506 |
2799 |
25 |
24 |
3 |
0 |
0 |
0 |
| OW |
207 |
2550 |
381 |
399 |
7 |
0 |
0 |
0 |
| VODI |
0 |
366 |
396 |
4213 |
186 |
0 |
0 |
0 |
| ODI |
0 |
14 |
0 |
611 |
4764 |
150 |
0 |
0 |
| CDI |
0 |
1 |
0 |
26 |
1757 |
6166 |
1119 |
0 |
| VCDI |
0 |
9 |
1 |
12 |
108 |
1349 |
4425 |
657 |
|
...date precedes bulletin
|
Date: 2025-08-17:
| 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 |
28477 |
2722 |
10 |
22 |
3 |
0 |
0 |
0 |
| OW |
146 |
3063 |
376 |
219 |
4 |
0 |
0 |
0 |
| VODI |
9 |
618 |
694 |
3819 |
313 |
0 |
0 |
0 |
| ODI |
0 |
20 |
8 |
612 |
4724 |
248 |
0 |
0 |
| CDI |
0 |
1 |
0 |
47 |
2298 |
4987 |
844 |
0 |
| VCDI |
0 |
4 |
1 |
16 |
94 |
764 |
4736 |
1332 |
|
...date precedes bulletin
|
Date: 2025-08-19:
| 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 |
28778 |
3517 |
22 |
28 |
1 |
0 |
0 |
0 |
| OW |
199 |
3203 |
871 |
656 |
9 |
0 |
0 |
0 |
| VODI |
4 |
103 |
239 |
3346 |
746 |
0 |
0 |
0 |
| ODI |
0 |
3 |
1 |
317 |
5015 |
325 |
0 |
0 |
| CDI |
0 |
0 |
0 |
70 |
1312 |
5640 |
377 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
60 |
2082 |
4154 |
152 |
|
...date precedes bulletin
|
Date: 2025-08-21:
| 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 |
29556 |
2929 |
16 |
18 |
0 |
0 |
0 |
0 |
| OW |
334 |
4071 |
557 |
272 |
3 |
0 |
0 |
0 |
| VODI |
14 |
274 |
535 |
2941 |
500 |
0 |
0 |
0 |
| ODI |
0 |
3 |
0 |
586 |
4910 |
587 |
0 |
0 |
| CDI |
0 |
0 |
2 |
102 |
1161 |
4744 |
1308 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
67 |
945 |
4531 |
265 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
29553 |
3338 |
20 |
25 |
0 |
0 |
0 |
0 |
| OW |
331 |
3631 |
582 |
337 |
5 |
0 |
0 |
0 |
| VODI |
20 |
305 |
506 |
2885 |
729 |
0 |
0 |
0 |
| ODI |
0 |
3 |
0 |
573 |
4482 |
517 |
0 |
0 |
| CDI |
0 |
0 |
2 |
99 |
1352 |
4838 |
1266 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
73 |
921 |
4573 |
265 |
|
Date: 2025-08-23:
| 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 |
29601 |
2881 |
18 |
11 |
0 |
0 |
0 |
0 |
| OW |
646 |
4322 |
315 |
182 |
7 |
0 |
0 |
0 |
| VODI |
10 |
533 |
516 |
2725 |
637 |
0 |
0 |
0 |
| ODI |
0 |
5 |
5 |
857 |
4687 |
748 |
0 |
0 |
| CDI |
0 |
20 |
1 |
110 |
898 |
5571 |
372 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
66 |
1566 |
3917 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
29675 |
3275 |
20 |
15 |
1 |
0 |
0 |
0 |
| OW |
567 |
3920 |
356 |
245 |
9 |
0 |
0 |
0 |
| VODI |
15 |
540 |
474 |
2738 |
941 |
0 |
0 |
0 |
| ODI |
0 |
6 |
4 |
782 |
4114 |
680 |
0 |
0 |
| CDI |
0 |
20 |
1 |
107 |
1163 |
5562 |
360 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
67 |
1643 |
3929 |
0 |
|
Date: 2025-08-25:
| 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 |
30029 |
4392 |
14 |
57 |
6 |
0 |
0 |
0 |
| OW |
300 |
3612 |
623 |
992 |
11 |
0 |
0 |
0 |
| VODI |
6 |
40 |
110 |
2796 |
650 |
0 |
0 |
0 |
| ODI |
0 |
5 |
0 |
190 |
4521 |
223 |
0 |
0 |
| CDI |
0 |
5 |
0 |
26 |
950 |
6502 |
169 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
19 |
2630 |
2353 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
29683 |
3206 |
9 |
52 |
7 |
0 |
0 |
0 |
| OW |
646 |
3973 |
288 |
290 |
6 |
0 |
0 |
0 |
| VODI |
6 |
842 |
442 |
2707 |
919 |
0 |
0 |
0 |
| ODI |
0 |
10 |
7 |
910 |
4021 |
1014 |
4 |
0 |
| CDI |
0 |
23 |
1 |
102 |
1135 |
5054 |
281 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
69 |
3287 |
2237 |
0 |
|
Date: 2025-08-27:
| 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 |
30031 |
4367 |
40 |
44 |
0 |
0 |
0 |
0 |
| OW |
269 |
3781 |
661 |
806 |
1 |
0 |
0 |
0 |
| VODI |
5 |
90 |
81 |
2660 |
764 |
0 |
0 |
0 |
| ODI |
0 |
7 |
0 |
157 |
4518 |
632 |
0 |
0 |
| CDI |
0 |
6 |
1 |
24 |
833 |
6648 |
427 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
21 |
3306 |
1051 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
29720 |
3254 |
24 |
36 |
0 |
0 |
0 |
0 |
| OW |
579 |
3914 |
373 |
415 |
1 |
0 |
0 |
0 |
| VODI |
6 |
936 |
363 |
2341 |
1172 |
0 |
0 |
0 |
| ODI |
0 |
112 |
18 |
807 |
3913 |
1435 |
0 |
0 |
| CDI |
0 |
35 |
5 |
82 |
1011 |
5028 |
269 |
0 |
| VCDI |
0 |
0 |
0 |
10 |
40 |
4123 |
1209 |
0 |
|
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 |
30132 |
4346 |
36 |
19 |
0 |
0 |
0 |
0 |
| OW |
263 |
3817 |
511 |
776 |
4 |
0 |
0 |
0 |
| VODI |
3 |
164 |
150 |
2422 |
855 |
0 |
0 |
0 |
| ODI |
0 |
15 |
1 |
129 |
3540 |
474 |
0 |
0 |
| CDI |
0 |
7 |
0 |
26 |
909 |
8479 |
133 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
27 |
3412 |
581 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
29781 |
3129 |
22 |
19 |
0 |
0 |
0 |
0 |
| OW |
615 |
3926 |
321 |
581 |
37 |
0 |
0 |
0 |
| VODI |
2 |
1091 |
278 |
1889 |
1400 |
253 |
0 |
0 |
| ODI |
0 |
166 |
74 |
677 |
3083 |
2482 |
0 |
0 |
| CDI |
0 |
37 |
3 |
199 |
798 |
4260 |
190 |
0 |
| VCDI |
0 |
0 |
0 |
7 |
17 |
5370 |
524 |
0 |
|
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