Validation of sea ice concentration - American sector
Bulletin date: 2025-08-21
Data source: OSI SAF N.H. AMSR 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 |
12295 |
4040 |
92 |
42 |
3 |
0 |
0 |
0 |
| OW |
6 |
2635 |
519 |
284 |
10 |
2 |
0 |
0 |
| VODI |
0 |
417 |
721 |
3599 |
343 |
7 |
0 |
0 |
| ODI |
0 |
10 |
14 |
757 |
4488 |
223 |
0 |
0 |
| CDI |
0 |
3 |
1 |
30 |
1543 |
5854 |
1479 |
0 |
| VCDI |
0 |
4 |
1 |
3 |
50 |
1520 |
4558 |
313 |
|
...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 |
12725 |
3542 |
62 |
23 |
2 |
0 |
0 |
0 |
| OW |
0 |
3027 |
454 |
221 |
11 |
1 |
0 |
0 |
| VODI |
0 |
895 |
855 |
3227 |
384 |
8 |
0 |
0 |
| ODI |
0 |
18 |
33 |
777 |
4271 |
468 |
1 |
0 |
| CDI |
0 |
1 |
4 |
67 |
1935 |
5074 |
911 |
0 |
| VCDI |
0 |
2 |
2 |
1 |
60 |
941 |
5863 |
0 |
|
...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 |
13151 |
4216 |
72 |
16 |
0 |
0 |
0 |
0 |
| OW |
110 |
3268 |
950 |
488 |
5 |
1 |
0 |
0 |
| VODI |
13 |
113 |
445 |
3114 |
669 |
2 |
0 |
0 |
| ODI |
0 |
2 |
3 |
445 |
4560 |
600 |
0 |
0 |
| CDI |
0 |
4 |
4 |
45 |
1221 |
5378 |
576 |
0 |
| VCDI |
0 |
0 |
2 |
7 |
23 |
2326 |
3955 |
82 |
|
...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 |
13452 |
4139 |
21 |
7 |
0 |
0 |
0 |
0 |
| OW |
107 |
4157 |
642 |
216 |
1 |
0 |
0 |
0 |
| VODI |
14 |
418 |
750 |
2583 |
431 |
1 |
0 |
0 |
| ODI |
0 |
7 |
17 |
722 |
4444 |
837 |
0 |
0 |
| CDI |
0 |
5 |
8 |
96 |
1118 |
4607 |
1321 |
0 |
| VCDI |
0 |
2 |
6 |
10 |
21 |
1450 |
4256 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13437 |
4551 |
26 |
10 |
0 |
0 |
0 |
0 |
| OW |
121 |
3727 |
675 |
270 |
2 |
0 |
0 |
0 |
| VODI |
15 |
435 |
712 |
2595 |
601 |
2 |
0 |
0 |
| ODI |
0 |
7 |
17 |
661 |
4097 |
744 |
0 |
0 |
| CDI |
0 |
6 |
8 |
88 |
1290 |
4723 |
1278 |
0 |
| VCDI |
0 |
2 |
6 |
10 |
25 |
1426 |
4299 |
0 |
|
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 |
13466 |
4116 |
29 |
6 |
0 |
0 |
0 |
0 |
| OW |
253 |
4353 |
533 |
195 |
2 |
0 |
0 |
0 |
| VODI |
4 |
637 |
745 |
2315 |
661 |
1 |
0 |
0 |
| ODI |
0 |
14 |
27 |
976 |
4380 |
857 |
0 |
0 |
| CDI |
0 |
21 |
21 |
102 |
950 |
5242 |
490 |
0 |
| VCDI |
0 |
4 |
5 |
12 |
17 |
1810 |
3622 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13477 |
4558 |
33 |
8 |
1 |
0 |
0 |
0 |
| OW |
240 |
3910 |
581 |
254 |
3 |
0 |
0 |
0 |
| VODI |
6 |
634 |
689 |
2390 |
913 |
4 |
0 |
0 |
| ODI |
0 |
17 |
30 |
841 |
3862 |
788 |
0 |
0 |
| CDI |
0 |
22 |
22 |
100 |
1212 |
5242 |
466 |
0 |
| VCDI |
0 |
4 |
5 |
13 |
19 |
1876 |
3646 |
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 |
14589 |
4947 |
23 |
2 |
0 |
0 |
0 |
0 |
| OW |
108 |
3736 |
1072 |
485 |
1 |
0 |
0 |
0 |
| VODI |
3 |
20 |
106 |
2753 |
662 |
0 |
0 |
0 |
| ODI |
0 |
10 |
5 |
222 |
4325 |
329 |
0 |
0 |
| CDI |
0 |
14 |
6 |
24 |
977 |
6252 |
270 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
12 |
2430 |
2481 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
14404 |
3626 |
20 |
3 |
0 |
0 |
0 |
0 |
| OW |
293 |
4138 |
393 |
258 |
0 |
0 |
0 |
0 |
| VODI |
3 |
876 |
716 |
2279 |
965 |
5 |
0 |
0 |
| ODI |
0 |
44 |
65 |
858 |
3754 |
1192 |
12 |
0 |
| CDI |
0 |
43 |
14 |
72 |
1229 |
4648 |
444 |
0 |
| VCDI |
0 |
0 |
4 |
18 |
29 |
3166 |
2295 |
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 |
14750 |
4763 |
19 |
9 |
1 |
0 |
0 |
0 |
| OW |
134 |
3852 |
856 |
536 |
9 |
0 |
0 |
0 |
| VODI |
2 |
89 |
248 |
2405 |
791 |
9 |
0 |
0 |
| ODI |
0 |
6 |
1 |
297 |
3952 |
1013 |
0 |
0 |
| CDI |
0 |
13 |
3 |
19 |
809 |
6345 |
636 |
0 |
| VCDI |
0 |
0 |
0 |
6 |
13 |
2895 |
1385 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
14558 |
3544 |
10 |
16 |
0 |
0 |
0 |
0 |
| OW |
324 |
3999 |
435 |
377 |
17 |
0 |
0 |
0 |
| VODI |
4 |
1045 |
609 |
1936 |
1133 |
28 |
0 |
0 |
| ODI |
0 |
93 |
63 |
839 |
3413 |
1836 |
6 |
0 |
| CDI |
0 |
38 |
10 |
96 |
982 |
4692 |
462 |
0 |
| VCDI |
0 |
4 |
0 |
8 |
30 |
3706 |
1553 |
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 |
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
14773 |
3219 |
44 |
13 |
1 |
0 |
0 |
0 |
| OW |
486 |
3978 |
337 |
475 |
81 |
0 |
0 |
0 |
| VODI |
0 |
1220 |
478 |
1459 |
1358 |
322 |
0 |
0 |
| ODI |
0 |
180 |
111 |
654 |
3200 |
2285 |
10 |
0 |
| CDI |
0 |
44 |
2 |
212 |
1030 |
3713 |
338 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
21 |
4961 |
859 |
0 |
|
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