Validation of sea ice concentration - American sector
Bulletin date: 2025-09-11
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-09-07:
| 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 |
32526 |
4373 |
22 |
1 |
0 |
0 |
0 |
0 |
| OW |
431 |
2712 |
432 |
269 |
0 |
0 |
0 |
0 |
| VODI |
26 |
242 |
265 |
2421 |
450 |
21 |
0 |
0 |
| ODI |
0 |
14 |
3 |
316 |
4685 |
411 |
0 |
0 |
| CDI |
0 |
7 |
2 |
16 |
781 |
6738 |
635 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
37 |
2815 |
580 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-09:
| 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 |
32533 |
5452 |
40 |
10 |
0 |
0 |
0 |
0 |
| OW |
317 |
2031 |
540 |
592 |
5 |
0 |
0 |
0 |
| VODI |
2 |
38 |
52 |
2457 |
488 |
1 |
0 |
0 |
| ODI |
0 |
3 |
1 |
150 |
3082 |
55 |
0 |
0 |
| CDI |
0 |
0 |
0 |
4 |
2096 |
7681 |
262 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
1 |
2011 |
1327 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-11:
| 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 |
31158 |
5787 |
19 |
11 |
0 |
0 |
0 |
0 |
| OW |
240 |
2893 |
383 |
574 |
46 |
0 |
0 |
0 |
| VODI |
16 |
105 |
130 |
2340 |
566 |
44 |
0 |
0 |
| ODI |
0 |
13 |
1 |
319 |
2971 |
189 |
0 |
0 |
| CDI |
0 |
1 |
0 |
3 |
2253 |
4240 |
115 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
2 |
5319 |
1493 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
31164 |
5839 |
21 |
19 |
0 |
0 |
0 |
0 |
| OW |
237 |
2816 |
380 |
584 |
42 |
0 |
0 |
0 |
| VODI |
13 |
128 |
132 |
2356 |
737 |
42 |
0 |
0 |
| ODI |
0 |
15 |
0 |
286 |
2925 |
234 |
0 |
0 |
| CDI |
0 |
1 |
0 |
2 |
2132 |
4453 |
142 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
2 |
5063 |
1466 |
0 |
|
Date: 2025-09-13:
| 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 |
32374 |
4346 |
28 |
18 |
0 |
0 |
0 |
0 |
| OW |
661 |
2721 |
294 |
364 |
38 |
0 |
0 |
0 |
| VODI |
18 |
196 |
173 |
2260 |
685 |
13 |
0 |
0 |
| ODI |
0 |
13 |
0 |
297 |
3154 |
209 |
0 |
0 |
| CDI |
0 |
2 |
1 |
8 |
1868 |
3757 |
53 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
5498 |
2182 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
32374 |
4181 |
26 |
25 |
0 |
0 |
0 |
0 |
| OW |
659 |
2869 |
321 |
379 |
28 |
0 |
0 |
0 |
| VODI |
20 |
210 |
148 |
2318 |
880 |
14 |
0 |
0 |
| ODI |
0 |
16 |
0 |
211 |
3138 |
248 |
0 |
0 |
| CDI |
0 |
2 |
1 |
14 |
1699 |
3840 |
61 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
5375 |
2174 |
0 |
|
Date: 2025-09-15:
| 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 |
32549 |
6067 |
41 |
66 |
0 |
0 |
0 |
0 |
| OW |
68 |
1896 |
394 |
604 |
10 |
2 |
0 |
0 |
| VODI |
0 |
36 |
20 |
1804 |
608 |
9 |
0 |
0 |
| ODI |
0 |
0 |
0 |
49 |
2923 |
27 |
0 |
0 |
| CDI |
0 |
0 |
0 |
4 |
1147 |
4087 |
10 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
32 |
5459 |
3319 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
32056 |
4635 |
28 |
73 |
0 |
0 |
0 |
0 |
| OW |
560 |
2931 |
240 |
387 |
16 |
10 |
0 |
0 |
| VODI |
1 |
425 |
186 |
1699 |
1036 |
113 |
0 |
0 |
| ODI |
0 |
8 |
1 |
357 |
2532 |
322 |
0 |
0 |
| CDI |
0 |
0 |
0 |
11 |
1136 |
3271 |
118 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
5868 |
3211 |
0 |
|
Date: 2025-09-17:
| 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 |
32380 |
6385 |
66 |
71 |
2 |
0 |
0 |
0 |
| OW |
62 |
1560 |
383 |
799 |
99 |
1 |
0 |
0 |
| VODI |
0 |
53 |
54 |
1446 |
897 |
5 |
0 |
0 |
| ODI |
0 |
0 |
1 |
134 |
2457 |
148 |
0 |
0 |
| CDI |
0 |
0 |
0 |
26 |
1298 |
3656 |
8 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
63 |
5825 |
3352 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
31893 |
4889 |
38 |
67 |
0 |
0 |
0 |
0 |
| OW |
549 |
2777 |
271 |
552 |
55 |
0 |
0 |
0 |
| VODI |
0 |
325 |
194 |
1601 |
1030 |
48 |
0 |
0 |
| ODI |
0 |
7 |
1 |
232 |
2748 |
415 |
0 |
0 |
| CDI |
0 |
0 |
0 |
24 |
980 |
2802 |
117 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
3 |
6370 |
3243 |
0 |
|
Date: 2025-09-19:
| 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 |
32535 |
6143 |
86 |
66 |
0 |
0 |
0 |
0 |
| OW |
37 |
1639 |
393 |
728 |
48 |
0 |
0 |
0 |
| VODI |
0 |
104 |
103 |
1083 |
969 |
43 |
0 |
0 |
| ODI |
0 |
0 |
3 |
142 |
990 |
1619 |
11 |
0 |
| CDI |
0 |
0 |
0 |
47 |
785 |
3616 |
197 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
91 |
4661 |
4986 |
106 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
31882 |
4622 |
38 |
59 |
0 |
0 |
0 |
0 |
| OW |
689 |
2815 |
310 |
449 |
22 |
0 |
0 |
0 |
| VODI |
1 |
436 |
227 |
1339 |
835 |
92 |
0 |
0 |
| ODI |
0 |
12 |
8 |
171 |
1397 |
2148 |
61 |
0 |
| CDI |
0 |
1 |
2 |
48 |
533 |
3158 |
219 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
96 |
4541 |
4914 |
106 |
|
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