Validation of sea ice concentration - American sector
Bulletin date: 2025-04-17
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-04-11:
| 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 |
5392 |
2864 |
45 |
53 |
31 |
0 |
0 |
0 |
| OW |
0 |
309 |
110 |
309 |
158 |
3 |
0 |
0 |
| VODI |
0 |
3 |
21 |
239 |
362 |
131 |
0 |
0 |
| ODI |
0 |
0 |
0 |
28 |
222 |
387 |
34 |
11 |
| CDI |
0 |
0 |
0 |
115 |
125 |
725 |
1454 |
81 |
| VCDI |
0 |
0 |
0 |
80 |
302 |
1820 |
12528 |
33289 |
|
...date precedes bulletin
|
Date: 2025-04-13:
| 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 |
5100 |
2809 |
38 |
85 |
3 |
0 |
0 |
0 |
| OW |
0 |
340 |
110 |
375 |
183 |
5 |
0 |
0 |
| VODI |
0 |
1 |
6 |
205 |
480 |
85 |
2 |
0 |
| ODI |
0 |
0 |
0 |
37 |
285 |
437 |
39 |
0 |
| CDI |
0 |
0 |
0 |
104 |
193 |
1040 |
591 |
22 |
| VCDI |
0 |
0 |
0 |
130 |
297 |
2680 |
13892 |
31657 |
|
...date precedes bulletin
|
Date: 2025-04-15:
| 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 |
4995 |
2920 |
45 |
78 |
2 |
0 |
0 |
0 |
| OW |
0 |
288 |
100 |
246 |
122 |
6 |
0 |
0 |
| VODI |
0 |
0 |
13 |
243 |
429 |
81 |
3 |
0 |
| ODI |
0 |
0 |
0 |
83 |
602 |
289 |
19 |
1 |
| CDI |
0 |
0 |
0 |
54 |
393 |
1925 |
506 |
33 |
| VCDI |
0 |
0 |
0 |
23 |
324 |
2909 |
12323 |
32176 |
|
...date precedes bulletin
|
Date: 2025-04-17:
| 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 |
4890 |
2797 |
43 |
75 |
25 |
0 |
0 |
0 |
| OW |
0 |
452 |
83 |
209 |
170 |
2 |
0 |
0 |
| VODI |
0 |
5 |
13 |
352 |
526 |
80 |
5 |
0 |
| ODI |
0 |
0 |
0 |
80 |
617 |
413 |
49 |
0 |
| CDI |
0 |
0 |
0 |
21 |
510 |
2067 |
417 |
12 |
| VCDI |
0 |
0 |
0 |
8 |
386 |
3162 |
12395 |
31367 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
4890 |
2757 |
30 |
59 |
38 |
0 |
0 |
0 |
| OW |
0 |
474 |
84 |
241 |
215 |
3 |
0 |
0 |
| VODI |
0 |
23 |
25 |
326 |
476 |
107 |
8 |
0 |
| ODI |
0 |
0 |
0 |
85 |
589 |
474 |
53 |
0 |
| CDI |
0 |
0 |
0 |
25 |
514 |
1982 |
388 |
12 |
| VCDI |
0 |
0 |
0 |
9 |
402 |
3158 |
12417 |
31367 |
|
Date: 2025-04-19:
| 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 |
5120 |
2696 |
18 |
82 |
16 |
0 |
0 |
0 |
| OW |
0 |
535 |
55 |
234 |
91 |
8 |
0 |
0 |
| VODI |
0 |
33 |
37 |
356 |
576 |
68 |
8 |
0 |
| ODI |
0 |
0 |
0 |
123 |
773 |
274 |
45 |
0 |
| CDI |
0 |
0 |
0 |
62 |
716 |
1521 |
549 |
9 |
| VCDI |
0 |
0 |
0 |
25 |
567 |
3021 |
14878 |
28735 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5120 |
2645 |
17 |
103 |
33 |
0 |
0 |
0 |
| OW |
0 |
563 |
58 |
229 |
138 |
8 |
0 |
0 |
| VODI |
0 |
56 |
28 |
334 |
560 |
93 |
7 |
0 |
| ODI |
0 |
0 |
7 |
121 |
828 |
328 |
58 |
0 |
| CDI |
0 |
0 |
0 |
64 |
613 |
1555 |
538 |
8 |
| VCDI |
0 |
0 |
0 |
31 |
567 |
2908 |
14877 |
28736 |
|
Date: 2025-04-21:
| 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 |
5470 |
2893 |
39 |
77 |
24 |
0 |
0 |
0 |
| OW |
0 |
169 |
112 |
228 |
66 |
0 |
0 |
0 |
| VODI |
0 |
2 |
10 |
618 |
533 |
40 |
0 |
0 |
| ODI |
0 |
0 |
0 |
65 |
928 |
432 |
31 |
10 |
| CDI |
0 |
0 |
0 |
15 |
635 |
2602 |
560 |
93 |
| VCDI |
0 |
0 |
0 |
0 |
218 |
2141 |
13892 |
29328 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5470 |
2468 |
33 |
87 |
37 |
0 |
0 |
0 |
| OW |
0 |
538 |
77 |
191 |
173 |
1 |
0 |
0 |
| VODI |
0 |
58 |
49 |
411 |
410 |
159 |
0 |
0 |
| ODI |
0 |
0 |
2 |
198 |
675 |
566 |
59 |
5 |
| CDI |
0 |
0 |
0 |
112 |
654 |
1714 |
493 |
138 |
| VCDI |
0 |
0 |
0 |
4 |
455 |
2775 |
13931 |
29288 |
|
Date: 2025-04-23:
| 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 |
5326 |
2936 |
36 |
72 |
14 |
0 |
0 |
0 |
| OW |
0 |
209 |
88 |
419 |
72 |
0 |
0 |
0 |
| VODI |
0 |
15 |
16 |
596 |
580 |
108 |
12 |
0 |
| ODI |
0 |
0 |
0 |
101 |
1055 |
623 |
68 |
1 |
| CDI |
0 |
0 |
0 |
19 |
555 |
1990 |
1020 |
39 |
| VCDI |
0 |
0 |
0 |
0 |
329 |
1271 |
12846 |
30815 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5326 |
2637 |
33 |
101 |
22 |
1 |
0 |
0 |
| OW |
0 |
446 |
51 |
325 |
170 |
12 |
0 |
0 |
| VODI |
0 |
62 |
43 |
467 |
560 |
224 |
21 |
0 |
| ODI |
0 |
15 |
7 |
190 |
727 |
604 |
118 |
11 |
| CDI |
0 |
0 |
6 |
124 |
666 |
1598 |
730 |
74 |
| VCDI |
0 |
0 |
0 |
0 |
460 |
1553 |
13077 |
30770 |
|
Date: 2025-04-25:
| 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 |
5575 |
2757 |
36 |
46 |
0 |
0 |
0 |
0 |
| OW |
0 |
302 |
116 |
490 |
59 |
16 |
0 |
0 |
| VODI |
0 |
66 |
46 |
466 |
624 |
158 |
4 |
0 |
| ODI |
0 |
8 |
15 |
216 |
1091 |
808 |
88 |
17 |
| CDI |
0 |
0 |
0 |
66 |
584 |
1552 |
878 |
97 |
| VCDI |
0 |
0 |
0 |
33 |
273 |
1256 |
13501 |
29987 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5575 |
2373 |
34 |
70 |
9 |
15 |
0 |
0 |
| OW |
0 |
594 |
54 |
254 |
201 |
71 |
2 |
0 |
| VODI |
0 |
110 |
94 |
464 |
528 |
323 |
53 |
0 |
| ODI |
0 |
38 |
17 |
306 |
798 |
566 |
156 |
5 |
| CDI |
0 |
18 |
14 |
183 |
773 |
1341 |
774 |
22 |
| VCDI |
0 |
0 |
0 |
40 |
322 |
1474 |
13486 |
30074 |
|
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