Validation of sea ice concentration - American sector
Bulletin date: 2025-07-31
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-07-27:
| 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 |
25597 |
3603 |
98 |
82 |
5 |
0 |
0 |
0 |
| OW |
8 |
860 |
272 |
812 |
40 |
2 |
0 |
0 |
| VODI |
0 |
122 |
31 |
2178 |
688 |
19 |
0 |
0 |
| ODI |
0 |
27 |
2 |
198 |
4257 |
884 |
0 |
0 |
| CDI |
0 |
80 |
33 |
154 |
4588 |
9271 |
1744 |
42 |
| VCDI |
0 |
3 |
11 |
175 |
639 |
3772 |
934 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-29:
| 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 |
26018 |
3804 |
137 |
68 |
1 |
0 |
0 |
0 |
| OW |
12 |
781 |
303 |
951 |
17 |
8 |
0 |
0 |
| VODI |
3 |
101 |
31 |
2311 |
805 |
19 |
0 |
0 |
| ODI |
0 |
31 |
20 |
92 |
6242 |
263 |
0 |
0 |
| CDI |
0 |
6 |
20 |
205 |
2370 |
12557 |
813 |
0 |
| VCDI |
0 |
0 |
0 |
30 |
191 |
991 |
2030 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-31:
| 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 |
25948 |
3768 |
79 |
28 |
0 |
0 |
0 |
0 |
| OW |
10 |
985 |
370 |
821 |
3 |
0 |
0 |
0 |
| VODI |
1 |
103 |
41 |
2454 |
1422 |
0 |
0 |
0 |
| ODI |
0 |
35 |
14 |
164 |
5210 |
854 |
0 |
0 |
| CDI |
0 |
17 |
21 |
219 |
3004 |
11114 |
1250 |
0 |
| VCDI |
0 |
0 |
0 |
7 |
214 |
2435 |
640 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
25948 |
3878 |
90 |
27 |
0 |
0 |
0 |
0 |
| OW |
9 |
869 |
359 |
867 |
4 |
0 |
0 |
0 |
| VODI |
2 |
108 |
41 |
2416 |
1384 |
0 |
0 |
0 |
| ODI |
0 |
35 |
10 |
149 |
5217 |
829 |
31 |
0 |
| CDI |
0 |
18 |
25 |
231 |
3047 |
11086 |
1212 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
201 |
2488 |
647 |
0 |
|
Date: 2025-08-02:
| 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 |
26401 |
3421 |
52 |
5 |
0 |
0 |
0 |
0 |
| OW |
84 |
1159 |
416 |
760 |
3 |
0 |
0 |
0 |
| VODI |
2 |
233 |
128 |
3303 |
928 |
16 |
0 |
0 |
| ODI |
0 |
78 |
8 |
697 |
3215 |
1979 |
190 |
0 |
| CDI |
0 |
59 |
34 |
200 |
2510 |
7490 |
3930 |
326 |
| VCDI |
0 |
0 |
0 |
2 |
240 |
637 |
2721 |
4 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
26397 |
3581 |
61 |
10 |
0 |
0 |
0 |
0 |
| OW |
88 |
1005 |
426 |
779 |
1 |
0 |
0 |
0 |
| VODI |
2 |
222 |
108 |
3076 |
1060 |
12 |
0 |
0 |
| ODI |
0 |
73 |
9 |
893 |
3075 |
1739 |
409 |
0 |
| CDI |
0 |
69 |
34 |
207 |
2533 |
7619 |
3645 |
321 |
| VCDI |
0 |
0 |
0 |
2 |
227 |
752 |
2787 |
9 |
|
Date: 2025-08-04:
| 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 |
26252 |
4087 |
73 |
38 |
0 |
0 |
0 |
0 |
| OW |
47 |
1069 |
579 |
1000 |
2 |
0 |
0 |
0 |
| VODI |
0 |
87 |
33 |
4448 |
471 |
0 |
0 |
0 |
| ODI |
0 |
18 |
1 |
276 |
4166 |
70 |
0 |
0 |
| CDI |
0 |
11 |
1 |
36 |
1460 |
9458 |
143 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
26 |
1526 |
4264 |
1589 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
26219 |
3719 |
86 |
24 |
0 |
0 |
0 |
0 |
| OW |
79 |
1115 |
439 |
853 |
0 |
0 |
0 |
0 |
| VODI |
1 |
239 |
138 |
4024 |
729 |
7 |
0 |
0 |
| ODI |
0 |
98 |
7 |
695 |
2542 |
2513 |
23 |
0 |
| CDI |
0 |
96 |
16 |
180 |
2715 |
8138 |
2615 |
696 |
| VCDI |
0 |
5 |
1 |
22 |
139 |
396 |
1769 |
893 |
|
Date: 2025-08-06:
| 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 |
26662 |
3748 |
66 |
56 |
4 |
0 |
0 |
0 |
| OW |
29 |
1250 |
450 |
870 |
30 |
0 |
0 |
0 |
| VODI |
0 |
117 |
83 |
3972 |
969 |
16 |
0 |
0 |
| ODI |
0 |
23 |
2 |
199 |
3752 |
462 |
0 |
0 |
| CDI |
0 |
2 |
0 |
29 |
1835 |
8455 |
1959 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
22 |
970 |
3965 |
1234 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
26641 |
3411 |
83 |
94 |
2 |
0 |
0 |
0 |
| OW |
50 |
1263 |
322 |
782 |
22 |
0 |
0 |
0 |
| VODI |
0 |
288 |
156 |
3574 |
1239 |
139 |
6 |
0 |
| ODI |
0 |
100 |
14 |
478 |
2372 |
2602 |
241 |
0 |
| CDI |
0 |
78 |
26 |
187 |
2862 |
6929 |
4157 |
813 |
| VCDI |
0 |
0 |
0 |
11 |
115 |
233 |
1520 |
421 |
|
Date: 2025-08-08:
| 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 |
27010 |
3489 |
38 |
60 |
2 |
0 |
0 |
0 |
| OW |
28 |
1482 |
338 |
680 |
49 |
0 |
0 |
0 |
| VODI |
0 |
176 |
278 |
3721 |
1181 |
29 |
0 |
0 |
| ODI |
0 |
22 |
2 |
456 |
4029 |
466 |
53 |
0 |
| CDI |
0 |
0 |
0 |
39 |
1523 |
8797 |
2089 |
0 |
| VCDI |
0 |
0 |
0 |
18 |
64 |
170 |
3354 |
1588 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
26992 |
3010 |
30 |
66 |
0 |
0 |
0 |
0 |
| OW |
46 |
1489 |
275 |
737 |
33 |
2 |
0 |
0 |
| VODI |
0 |
465 |
313 |
3286 |
1540 |
41 |
1 |
0 |
| ODI |
0 |
109 |
14 |
624 |
2260 |
2408 |
499 |
0 |
| CDI |
0 |
96 |
24 |
219 |
2925 |
6941 |
3993 |
1084 |
| VCDI |
0 |
0 |
0 |
42 |
90 |
70 |
1003 |
504 |
|
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