Validation of sea ice concentration - American sector
Bulletin date: 2025-08-14
Data source: OSI SAF N.H. multi-product 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 |
27010 |
3489 |
38 |
60 |
2 |
0 |
0 |
0 |
| OW |
28 |
1482 |
338 |
680 |
49 |
0 |
0 |
0 |
| VODI |
0 |
176 |
278 |
3721 |
1181 |
29 |
0 |
0 |
| ODI |
0 |
22 |
2 |
456 |
4029 |
466 |
53 |
0 |
| CDI |
0 |
0 |
0 |
39 |
1523 |
8797 |
2089 |
0 |
| VCDI |
0 |
0 |
0 |
18 |
64 |
170 |
3354 |
1588 |
|
...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 |
27274 |
3196 |
56 |
24 |
0 |
0 |
0 |
0 |
| OW |
16 |
1709 |
452 |
582 |
6 |
2 |
0 |
0 |
| VODI |
0 |
234 |
348 |
4495 |
694 |
17 |
0 |
0 |
| ODI |
0 |
28 |
5 |
470 |
3669 |
998 |
23 |
0 |
| CDI |
0 |
5 |
1 |
41 |
754 |
8002 |
2831 |
3 |
| VCDI |
0 |
0 |
0 |
11 |
75 |
736 |
3717 |
757 |
|
...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 |
27700 |
3663 |
40 |
28 |
1 |
0 |
0 |
0 |
| OW |
6 |
1920 |
632 |
638 |
5 |
0 |
0 |
0 |
| VODI |
0 |
188 |
223 |
4029 |
439 |
0 |
0 |
0 |
| ODI |
0 |
5 |
1 |
336 |
4648 |
285 |
1 |
0 |
| CDI |
0 |
2 |
0 |
16 |
829 |
8089 |
666 |
0 |
| VCDI |
0 |
0 |
0 |
25 |
125 |
1972 |
4662 |
57 |
|
...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 |
28032 |
3325 |
40 |
18 |
5 |
0 |
0 |
0 |
| OW |
32 |
2423 |
572 |
412 |
8 |
0 |
0 |
0 |
| VODI |
0 |
275 |
298 |
4249 |
234 |
0 |
0 |
0 |
| ODI |
0 |
8 |
1 |
413 |
4968 |
146 |
0 |
0 |
| CDI |
0 |
1 |
0 |
19 |
2020 |
6185 |
859 |
0 |
| VCDI |
0 |
9 |
0 |
15 |
105 |
1379 |
4424 |
756 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
28033 |
3301 |
34 |
27 |
4 |
0 |
0 |
0 |
| OW |
31 |
2485 |
618 |
400 |
12 |
0 |
0 |
0 |
| VODI |
0 |
236 |
259 |
4154 |
383 |
0 |
0 |
0 |
| ODI |
0 |
9 |
0 |
511 |
4768 |
163 |
0 |
0 |
| CDI |
0 |
1 |
0 |
20 |
2060 |
6263 |
999 |
0 |
| VCDI |
0 |
9 |
0 |
14 |
113 |
1284 |
4284 |
756 |
|
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 |
28518 |
2724 |
16 |
17 |
3 |
0 |
0 |
0 |
| OW |
147 |
2888 |
357 |
257 |
8 |
0 |
0 |
0 |
| VODI |
4 |
495 |
508 |
4082 |
301 |
0 |
0 |
0 |
| ODI |
0 |
20 |
2 |
606 |
4686 |
103 |
0 |
0 |
| CDI |
0 |
1 |
0 |
50 |
2474 |
5210 |
931 |
0 |
| VCDI |
0 |
4 |
0 |
6 |
92 |
887 |
4538 |
1296 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
28513 |
2722 |
20 |
22 |
2 |
0 |
0 |
0 |
| OW |
150 |
2924 |
351 |
270 |
15 |
0 |
0 |
0 |
| VODI |
6 |
460 |
507 |
3954 |
531 |
0 |
0 |
0 |
| ODI |
0 |
21 |
5 |
706 |
4335 |
174 |
0 |
0 |
| CDI |
0 |
1 |
0 |
60 |
2561 |
5245 |
1305 |
0 |
| VCDI |
0 |
4 |
0 |
6 |
120 |
781 |
4164 |
1296 |
|
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 |
28495 |
3814 |
30 |
23 |
2 |
0 |
0 |
0 |
| OW |
121 |
2803 |
934 |
982 |
10 |
0 |
0 |
0 |
| VODI |
3 |
43 |
65 |
3593 |
608 |
0 |
0 |
0 |
| ODI |
0 |
3 |
2 |
126 |
5373 |
169 |
0 |
0 |
| CDI |
0 |
0 |
0 |
35 |
1209 |
5928 |
228 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
44 |
677 |
4968 |
941 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
28397 |
2747 |
30 |
27 |
4 |
0 |
0 |
0 |
| OW |
200 |
3152 |
349 |
262 |
26 |
0 |
0 |
0 |
| VODI |
21 |
740 |
647 |
3593 |
647 |
3 |
0 |
0 |
| ODI |
1 |
24 |
4 |
800 |
4440 |
294 |
0 |
0 |
| CDI |
0 |
0 |
1 |
63 |
2019 |
5314 |
1081 |
0 |
| VCDI |
0 |
0 |
0 |
16 |
110 |
1163 |
4115 |
941 |
|
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 |
29078 |
3277 |
17 |
22 |
1 |
0 |
0 |
0 |
| OW |
187 |
3926 |
585 |
400 |
5 |
0 |
0 |
0 |
| VODI |
9 |
195 |
422 |
3198 |
561 |
0 |
0 |
0 |
| ODI |
0 |
5 |
0 |
471 |
4943 |
484 |
0 |
0 |
| CDI |
0 |
0 |
0 |
71 |
1228 |
5449 |
532 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
77 |
1793 |
4280 |
15 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
28852 |
2333 |
18 |
29 |
3 |
0 |
0 |
0 |
| OW |
406 |
3434 |
180 |
163 |
14 |
0 |
0 |
0 |
| VODI |
16 |
1588 |
807 |
2727 |
666 |
0 |
0 |
0 |
| ODI |
0 |
48 |
19 |
1107 |
4241 |
534 |
0 |
0 |
| CDI |
0 |
0 |
0 |
124 |
1765 |
5218 |
888 |
0 |
| VCDI |
0 |
0 |
0 |
12 |
126 |
1974 |
3924 |
15 |
|
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 |
29412 |
3079 |
15 |
17 |
0 |
0 |
0 |
0 |
| OW |
410 |
4144 |
509 |
322 |
2 |
0 |
0 |
0 |
| VODI |
8 |
327 |
500 |
2902 |
600 |
0 |
0 |
0 |
| ODI |
0 |
2 |
0 |
661 |
4872 |
671 |
0 |
0 |
| CDI |
0 |
0 |
0 |
108 |
1224 |
4987 |
877 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
75 |
1836 |
3487 |
184 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
29112 |
1949 |
23 |
23 |
1 |
0 |
0 |
0 |
| OW |
588 |
3555 |
150 |
202 |
7 |
0 |
0 |
0 |
| VODI |
130 |
1970 |
819 |
2195 |
747 |
0 |
0 |
0 |
| ODI |
0 |
78 |
32 |
1415 |
4218 |
426 |
0 |
0 |
| CDI |
0 |
0 |
0 |
164 |
1700 |
5241 |
1158 |
2 |
| VCDI |
0 |
0 |
0 |
11 |
100 |
1827 |
3206 |
182 |
|
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