Validation of sea ice concentration - American sector
Bulletin date: 2025-07-17
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-07-11:
| 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 |
21484 |
3944 |
15 |
81 |
0 |
0 |
0 |
0 |
| OW |
76 |
1264 |
193 |
600 |
40 |
0 |
0 |
0 |
| VODI |
6 |
229 |
45 |
938 |
847 |
18 |
0 |
0 |
| ODI |
0 |
13 |
7 |
121 |
3045 |
1133 |
0 |
0 |
| CDI |
0 |
1 |
1 |
79 |
4703 |
14898 |
975 |
0 |
| VCDI |
0 |
0 |
0 |
15 |
718 |
2321 |
3421 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-13:
| 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 |
20882 |
4862 |
17 |
60 |
3 |
1 |
0 |
0 |
| OW |
32 |
1597 |
188 |
314 |
18 |
8 |
0 |
0 |
| VODI |
3 |
185 |
49 |
1119 |
737 |
45 |
0 |
0 |
| ODI |
0 |
29 |
6 |
205 |
2669 |
1066 |
0 |
0 |
| CDI |
0 |
20 |
2 |
39 |
2664 |
17977 |
2114 |
10 |
| VCDI |
0 |
0 |
0 |
18 |
765 |
1759 |
1756 |
12 |
|
...date precedes bulletin
|
Date: 2025-07-15:
| 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 |
23023 |
3611 |
55 |
110 |
8 |
0 |
0 |
0 |
| OW |
269 |
806 |
200 |
654 |
49 |
2 |
0 |
0 |
| VODI |
2 |
44 |
30 |
1167 |
756 |
5 |
0 |
0 |
| ODI |
0 |
2 |
1 |
75 |
5137 |
404 |
0 |
0 |
| CDI |
0 |
1 |
0 |
30 |
4233 |
14563 |
1328 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
489 |
2330 |
1798 |
49 |
|
...date precedes bulletin
|
Date: 2025-07-17:
| 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 |
24167 |
2895 |
24 |
35 |
7 |
0 |
0 |
0 |
| OW |
415 |
670 |
192 |
572 |
50 |
0 |
0 |
0 |
| VODI |
7 |
49 |
36 |
1266 |
916 |
8 |
0 |
0 |
| ODI |
0 |
16 |
6 |
147 |
5278 |
165 |
0 |
0 |
| CDI |
0 |
25 |
0 |
43 |
4580 |
14107 |
1090 |
0 |
| VCDI |
0 |
0 |
0 |
23 |
671 |
2107 |
1664 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
24194 |
2816 |
32 |
43 |
7 |
0 |
0 |
0 |
| OW |
379 |
735 |
179 |
566 |
62 |
3 |
0 |
0 |
| VODI |
16 |
61 |
39 |
1253 |
949 |
8 |
0 |
0 |
| ODI |
0 |
16 |
7 |
150 |
5126 |
293 |
0 |
0 |
| CDI |
0 |
27 |
1 |
53 |
4680 |
14120 |
1107 |
0 |
| VCDI |
0 |
0 |
0 |
21 |
678 |
1963 |
1647 |
0 |
|
Date: 2025-07-19:
| 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 |
24496 |
2928 |
48 |
36 |
1 |
0 |
0 |
0 |
| OW |
278 |
666 |
222 |
669 |
31 |
0 |
0 |
0 |
| VODI |
1 |
57 |
25 |
1252 |
1366 |
9 |
0 |
0 |
| ODI |
0 |
30 |
3 |
83 |
3631 |
766 |
0 |
0 |
| CDI |
0 |
22 |
5 |
54 |
2617 |
17955 |
355 |
0 |
| VCDI |
0 |
0 |
0 |
59 |
527 |
2771 |
268 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
24510 |
2865 |
57 |
86 |
6 |
0 |
0 |
0 |
| OW |
264 |
711 |
197 |
668 |
48 |
0 |
0 |
0 |
| VODI |
1 |
71 |
41 |
1199 |
1333 |
13 |
0 |
0 |
| ODI |
0 |
31 |
0 |
86 |
3728 |
1187 |
0 |
0 |
| CDI |
0 |
25 |
8 |
53 |
2530 |
17459 |
389 |
0 |
| VCDI |
0 |
0 |
0 |
61 |
528 |
2842 |
234 |
0 |
|
Date: 2025-07-21:
| 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 |
24814 |
3549 |
115 |
93 |
1 |
0 |
0 |
0 |
| OW |
52 |
450 |
217 |
1011 |
20 |
1 |
0 |
0 |
| VODI |
0 |
33 |
11 |
1207 |
1157 |
7 |
0 |
0 |
| ODI |
0 |
13 |
5 |
49 |
6687 |
516 |
0 |
0 |
| CDI |
0 |
3 |
1 |
154 |
1233 |
15784 |
709 |
0 |
| VCDI |
0 |
0 |
0 |
15 |
332 |
904 |
2088 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
24686 |
3190 |
62 |
61 |
1 |
0 |
0 |
0 |
| OW |
179 |
714 |
243 |
804 |
27 |
4 |
0 |
0 |
| VODI |
1 |
66 |
26 |
1338 |
1542 |
32 |
0 |
0 |
| ODI |
0 |
39 |
0 |
104 |
3640 |
658 |
1 |
0 |
| CDI |
0 |
39 |
18 |
77 |
3698 |
14187 |
1488 |
0 |
| VCDI |
0 |
0 |
0 |
145 |
522 |
2331 |
1308 |
0 |
|
Date: 2025-07-23:
| 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 |
25054 |
3587 |
110 |
86 |
0 |
0 |
0 |
0 |
| OW |
29 |
595 |
287 |
897 |
16 |
0 |
0 |
0 |
| VODI |
0 |
62 |
24 |
1858 |
798 |
8 |
0 |
0 |
| ODI |
0 |
22 |
3 |
99 |
5782 |
740 |
0 |
0 |
| CDI |
0 |
10 |
8 |
177 |
3113 |
12425 |
653 |
0 |
| VCDI |
0 |
0 |
0 |
71 |
423 |
3054 |
1240 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
24965 |
3103 |
67 |
40 |
4 |
0 |
0 |
0 |
| OW |
117 |
928 |
268 |
709 |
20 |
4 |
0 |
0 |
| VODI |
1 |
140 |
77 |
1904 |
1133 |
21 |
0 |
0 |
| ODI |
0 |
52 |
2 |
259 |
3769 |
601 |
1 |
0 |
| CDI |
0 |
41 |
11 |
81 |
4596 |
11827 |
758 |
0 |
| VCDI |
0 |
12 |
7 |
195 |
610 |
3774 |
1134 |
0 |
|
Date: 2025-07-25:
| 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 |
25522 |
3420 |
86 |
85 |
1 |
0 |
0 |
0 |
| OW |
28 |
689 |
291 |
846 |
33 |
0 |
0 |
0 |
| VODI |
7 |
76 |
27 |
1950 |
891 |
9 |
0 |
0 |
| ODI |
0 |
24 |
3 |
96 |
4910 |
883 |
0 |
0 |
| CDI |
0 |
31 |
22 |
152 |
4425 |
11997 |
188 |
0 |
| VCDI |
0 |
0 |
0 |
188 |
763 |
3427 |
161 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
25402 |
2925 |
59 |
72 |
12 |
0 |
0 |
0 |
| OW |
145 |
1017 |
267 |
617 |
30 |
4 |
0 |
0 |
| VODI |
10 |
169 |
74 |
1899 |
1091 |
30 |
0 |
0 |
| ODI |
0 |
47 |
4 |
355 |
2904 |
1382 |
0 |
0 |
| CDI |
0 |
45 |
3 |
105 |
6126 |
10279 |
173 |
0 |
| VCDI |
0 |
37 |
22 |
269 |
860 |
4621 |
176 |
0 |
|
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