Validation of sea ice concentration - American sector
Bulletin date: 2025-08-28
Data source: OSI SAF N.H. multi-product 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 |
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 |
|
...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 |
29485 |
3012 |
15 |
18 |
0 |
0 |
0 |
0 |
| OW |
799 |
4230 |
261 |
189 |
0 |
0 |
0 |
0 |
| VODI |
7 |
652 |
459 |
2730 |
595 |
0 |
0 |
0 |
| ODI |
0 |
8 |
2 |
911 |
4792 |
1049 |
0 |
0 |
| CDI |
0 |
21 |
0 |
101 |
972 |
5255 |
78 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
62 |
2543 |
2982 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-26:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
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 |
30165 |
4287 |
34 |
33 |
0 |
0 |
0 |
0 |
| OW |
318 |
3845 |
548 |
717 |
6 |
0 |
0 |
0 |
| VODI |
5 |
104 |
104 |
2752 |
701 |
1 |
0 |
0 |
| ODI |
0 |
12 |
1 |
133 |
3780 |
1027 |
0 |
0 |
| CDI |
0 |
6 |
0 |
25 |
569 |
6757 |
136 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
2 |
4287 |
876 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
30160 |
4499 |
48 |
48 |
0 |
0 |
0 |
0 |
| OW |
323 |
3639 |
533 |
778 |
7 |
0 |
0 |
0 |
| VODI |
5 |
97 |
105 |
2640 |
730 |
22 |
0 |
0 |
| ODI |
0 |
13 |
0 |
169 |
3681 |
1245 |
0 |
0 |
| CDI |
0 |
6 |
1 |
25 |
636 |
6390 |
118 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
4 |
4415 |
894 |
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 |
30165 |
4124 |
30 |
19 |
0 |
0 |
0 |
0 |
| OW |
225 |
3998 |
507 |
722 |
12 |
0 |
0 |
0 |
| VODI |
5 |
137 |
115 |
2259 |
890 |
0 |
0 |
0 |
| ODI |
0 |
27 |
1 |
145 |
3617 |
147 |
0 |
0 |
| CDI |
0 |
13 |
3 |
23 |
1946 |
8302 |
258 |
0 |
| VCDI |
0 |
3 |
0 |
0 |
21 |
2821 |
696 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
30157 |
4222 |
45 |
51 |
1 |
0 |
0 |
0 |
| OW |
236 |
3890 |
462 |
732 |
17 |
0 |
0 |
0 |
| VODI |
2 |
147 |
145 |
2187 |
894 |
0 |
0 |
0 |
| ODI |
0 |
25 |
1 |
172 |
3482 |
316 |
0 |
0 |
| CDI |
0 |
15 |
3 |
26 |
2071 |
7770 |
251 |
0 |
| VCDI |
0 |
3 |
0 |
0 |
21 |
3184 |
703 |
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 |
31872 |
4866 |
21 |
14 |
0 |
0 |
0 |
0 |
| OW |
442 |
2175 |
622 |
730 |
4 |
0 |
0 |
0 |
| VODI |
2 |
56 |
45 |
2309 |
526 |
8 |
0 |
0 |
| ODI |
0 |
10 |
0 |
68 |
5288 |
177 |
0 |
0 |
| CDI |
0 |
17 |
0 |
1 |
789 |
8082 |
96 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
21 |
1770 |
1220 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
31240 |
3055 |
32 |
43 |
0 |
0 |
0 |
0 |
| OW |
1075 |
3427 |
287 |
298 |
35 |
0 |
0 |
0 |
| VODI |
1 |
579 |
360 |
2189 |
602 |
5 |
0 |
0 |
| ODI |
0 |
26 |
9 |
559 |
3134 |
281 |
0 |
0 |
| CDI |
0 |
37 |
0 |
33 |
2821 |
6711 |
256 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
36 |
3040 |
1060 |
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 |
31861 |
5127 |
14 |
1 |
0 |
0 |
0 |
0 |
| OW |
370 |
2283 |
568 |
539 |
1 |
0 |
0 |
0 |
| VODI |
3 |
102 |
105 |
2443 |
449 |
0 |
0 |
0 |
| ODI |
0 |
20 |
0 |
112 |
5067 |
549 |
0 |
0 |
| CDI |
0 |
22 |
0 |
2 |
813 |
7004 |
487 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
11 |
1883 |
1395 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
31224 |
3206 |
43 |
22 |
1 |
0 |
0 |
0 |
| OW |
1008 |
3464 |
266 |
304 |
21 |
0 |
0 |
0 |
| VODI |
2 |
802 |
354 |
2030 |
637 |
0 |
0 |
0 |
| ODI |
0 |
42 |
24 |
666 |
2926 |
355 |
1 |
0 |
| CDI |
0 |
37 |
0 |
75 |
2704 |
6530 |
488 |
0 |
| VCDI |
0 |
3 |
0 |
0 |
52 |
2551 |
1393 |
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 |
32031 |
5009 |
35 |
2 |
0 |
0 |
0 |
0 |
| OW |
401 |
2398 |
504 |
413 |
5 |
0 |
0 |
0 |
| VODI |
18 |
209 |
170 |
2457 |
471 |
38 |
0 |
0 |
| ODI |
0 |
28 |
1 |
137 |
4948 |
476 |
0 |
0 |
| CDI |
0 |
20 |
0 |
10 |
661 |
7086 |
356 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
28 |
2395 |
924 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
31424 |
3225 |
57 |
33 |
2 |
0 |
0 |
0 |
| OW |
1023 |
3323 |
306 |
289 |
23 |
1 |
0 |
0 |
| VODI |
3 |
950 |
281 |
1898 |
695 |
43 |
0 |
0 |
| ODI |
0 |
129 |
62 |
611 |
2472 |
287 |
0 |
0 |
| CDI |
0 |
35 |
4 |
188 |
2853 |
5547 |
418 |
0 |
| VCDI |
0 |
2 |
0 |
0 |
68 |
4117 |
862 |
0 |
|
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