Validation of sea ice concentration - American sector
Bulletin date: 2025-08-28
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-08-24:
| 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 |
14336 |
3266 |
27 |
7 |
0 |
0 |
0 |
0 |
| OW |
328 |
4364 |
447 |
201 |
0 |
0 |
0 |
0 |
| VODI |
0 |
729 |
763 |
2263 |
631 |
0 |
0 |
0 |
| ODI |
0 |
16 |
30 |
1003 |
4496 |
1170 |
0 |
0 |
| CDI |
0 |
23 |
14 |
77 |
1012 |
4923 |
231 |
0 |
| VCDI |
0 |
0 |
4 |
14 |
20 |
2620 |
2851 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-26:
| 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 |
14812 |
4768 |
20 |
6 |
0 |
0 |
0 |
0 |
| OW |
117 |
3795 |
948 |
492 |
0 |
0 |
0 |
0 |
| VODI |
2 |
80 |
283 |
2476 |
720 |
0 |
0 |
0 |
| ODI |
0 |
6 |
0 |
268 |
4220 |
476 |
0 |
0 |
| CDI |
0 |
13 |
4 |
16 |
1208 |
6074 |
1020 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
14 |
1969 |
2056 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-28:
| 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 |
14919 |
4612 |
26 |
22 |
0 |
0 |
0 |
0 |
| OW |
239 |
3797 |
718 |
549 |
6 |
0 |
0 |
0 |
| VODI |
2 |
120 |
271 |
2441 |
755 |
21 |
0 |
0 |
| ODI |
0 |
8 |
2 |
317 |
3197 |
1382 |
0 |
0 |
| CDI |
0 |
10 |
1 |
21 |
670 |
6382 |
303 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
19 |
3806 |
1250 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
14918 |
4824 |
34 |
34 |
0 |
0 |
0 |
0 |
| OW |
240 |
3581 |
717 |
616 |
8 |
0 |
0 |
0 |
| VODI |
2 |
123 |
265 |
2322 |
785 |
41 |
0 |
0 |
| ODI |
0 |
8 |
1 |
355 |
3115 |
1584 |
0 |
0 |
| CDI |
0 |
11 |
1 |
22 |
720 |
6063 |
256 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
19 |
3903 |
1297 |
0 |
|
Date: 2025-08-30:
| 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 |
14863 |
4460 |
43 |
20 |
0 |
0 |
0 |
0 |
| OW |
154 |
3998 |
638 |
531 |
38 |
0 |
0 |
0 |
| VODI |
2 |
184 |
268 |
1966 |
905 |
5 |
0 |
0 |
| ODI |
0 |
15 |
6 |
305 |
3365 |
193 |
0 |
0 |
| CDI |
0 |
12 |
2 |
28 |
2200 |
7762 |
443 |
0 |
| VCDI |
0 |
0 |
1 |
1 |
22 |
2736 |
700 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
14857 |
4585 |
60 |
26 |
0 |
0 |
0 |
0 |
| OW |
162 |
3857 |
604 |
561 |
44 |
0 |
0 |
0 |
| VODI |
0 |
203 |
285 |
1909 |
900 |
5 |
0 |
0 |
| ODI |
0 |
12 |
6 |
321 |
3285 |
325 |
0 |
0 |
| CDI |
0 |
12 |
2 |
33 |
2277 |
7300 |
409 |
0 |
| VCDI |
0 |
0 |
1 |
1 |
24 |
3066 |
734 |
0 |
|
Date: 2025-09-01:
| 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 |
15692 |
6061 |
27 |
5 |
0 |
0 |
0 |
0 |
| OW |
64 |
2613 |
767 |
423 |
6 |
0 |
0 |
0 |
| VODI |
0 |
18 |
60 |
2190 |
606 |
1 |
0 |
0 |
| ODI |
0 |
4 |
0 |
263 |
4851 |
387 |
0 |
0 |
| CDI |
0 |
7 |
1 |
5 |
705 |
7824 |
336 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
10 |
1738 |
1202 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
15599 |
3790 |
24 |
17 |
0 |
0 |
0 |
0 |
| OW |
157 |
4204 |
330 |
268 |
36 |
8 |
0 |
0 |
| VODI |
0 |
670 |
460 |
1862 |
641 |
17 |
0 |
0 |
| ODI |
0 |
22 |
40 |
668 |
2807 |
434 |
0 |
0 |
| CDI |
0 |
17 |
1 |
71 |
2680 |
6453 |
531 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
14 |
3038 |
1007 |
0 |
|
Date: 2025-09-03:
| 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 |
15861 |
6163 |
19 |
3 |
0 |
0 |
0 |
0 |
| OW |
40 |
2568 |
640 |
386 |
9 |
0 |
0 |
0 |
| VODI |
0 |
60 |
215 |
2228 |
534 |
3 |
0 |
0 |
| ODI |
0 |
7 |
1 |
503 |
4361 |
843 |
0 |
0 |
| CDI |
0 |
8 |
2 |
10 |
785 |
6899 |
498 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
5 |
2124 |
1091 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
15773 |
3720 |
33 |
24 |
1 |
0 |
0 |
0 |
| OW |
128 |
4176 |
320 |
278 |
58 |
1 |
0 |
0 |
| VODI |
0 |
835 |
453 |
1773 |
673 |
13 |
0 |
0 |
| ODI |
0 |
57 |
66 |
908 |
2444 |
503 |
7 |
0 |
| CDI |
0 |
17 |
5 |
146 |
2486 |
6492 |
559 |
0 |
| VCDI |
0 |
1 |
0 |
1 |
32 |
2860 |
1023 |
0 |
|
Date: 2025-09-05:
| 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 |
15467 |
6591 |
40 |
23 |
0 |
0 |
0 |
0 |
| OW |
26 |
2652 |
529 |
405 |
4 |
0 |
0 |
0 |
| VODI |
0 |
225 |
365 |
2076 |
589 |
32 |
0 |
0 |
| ODI |
0 |
16 |
12 |
530 |
4081 |
922 |
0 |
0 |
| CDI |
0 |
7 |
3 |
11 |
722 |
6610 |
641 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
10 |
2009 |
1268 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
15389 |
4297 |
57 |
47 |
3 |
0 |
0 |
0 |
| OW |
104 |
3991 |
347 |
366 |
50 |
1 |
0 |
0 |
| VODI |
0 |
982 |
433 |
1617 |
730 |
37 |
0 |
0 |
| ODI |
0 |
175 |
78 |
827 |
1981 |
474 |
0 |
0 |
| CDI |
0 |
46 |
33 |
188 |
2576 |
5427 |
649 |
0 |
| VCDI |
0 |
0 |
1 |
0 |
66 |
3634 |
1260 |
0 |
|
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