Validation of sea ice concentration - American sector
Bulletin date: 2025-08-07
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-08-01:
| 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 |
26243 |
3518 |
67 |
15 |
0 |
0 |
0 |
0 |
| OW |
87 |
1058 |
365 |
768 |
2 |
0 |
0 |
0 |
| VODI |
2 |
159 |
122 |
3185 |
877 |
5 |
0 |
0 |
| ODI |
0 |
48 |
15 |
462 |
4236 |
1455 |
45 |
0 |
| CDI |
0 |
28 |
13 |
263 |
3069 |
8700 |
2629 |
90 |
| VCDI |
0 |
0 |
0 |
1 |
120 |
1066 |
1866 |
652 |
|
...date precedes bulletin
|
Date: 2025-08-03:
| 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 |
26251 |
3572 |
64 |
15 |
0 |
0 |
0 |
0 |
| OW |
72 |
1230 |
448 |
786 |
0 |
0 |
0 |
0 |
| VODI |
1 |
257 |
127 |
3968 |
512 |
0 |
0 |
0 |
| ODI |
0 |
85 |
9 |
712 |
3029 |
1890 |
196 |
0 |
| CDI |
0 |
67 |
41 |
203 |
2886 |
7528 |
3208 |
724 |
| VCDI |
0 |
8 |
0 |
23 |
248 |
367 |
1817 |
887 |
|
...date precedes bulletin
|
Date: 2025-08-05:
| 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 |
26407 |
3965 |
79 |
29 |
0 |
0 |
0 |
0 |
| OW |
41 |
1128 |
551 |
960 |
4 |
0 |
0 |
0 |
| VODI |
0 |
92 |
39 |
3896 |
1078 |
10 |
0 |
0 |
| ODI |
0 |
15 |
2 |
155 |
3812 |
252 |
0 |
0 |
| CDI |
0 |
9 |
1 |
28 |
1852 |
8947 |
1124 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
30 |
1064 |
4338 |
1323 |
|
...date precedes bulletin
|
Date: 2025-08-07:
| 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 |
26859 |
3617 |
61 |
33 |
0 |
0 |
0 |
0 |
| OW |
32 |
1403 |
467 |
766 |
7 |
0 |
0 |
0 |
| VODI |
0 |
130 |
72 |
4046 |
924 |
10 |
0 |
0 |
| ODI |
0 |
20 |
3 |
431 |
3648 |
498 |
0 |
0 |
| CDI |
0 |
2 |
0 |
51 |
2076 |
8057 |
2410 |
124 |
| VCDI |
0 |
0 |
0 |
9 |
62 |
539 |
3252 |
1622 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
26854 |
3798 |
110 |
50 |
0 |
0 |
0 |
0 |
| OW |
37 |
1220 |
413 |
813 |
6 |
0 |
0 |
0 |
| VODI |
0 |
131 |
76 |
3916 |
960 |
15 |
0 |
0 |
| ODI |
0 |
17 |
4 |
483 |
3764 |
481 |
0 |
0 |
| CDI |
0 |
6 |
0 |
65 |
1922 |
7987 |
2375 |
69 |
| VCDI |
0 |
0 |
0 |
9 |
65 |
621 |
3287 |
1677 |
|
Date: 2025-08-09:
| 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 |
27003 |
3518 |
46 |
37 |
0 |
0 |
0 |
0 |
| OW |
25 |
1558 |
494 |
559 |
7 |
0 |
0 |
0 |
| VODI |
0 |
200 |
372 |
3992 |
990 |
2 |
0 |
0 |
| ODI |
0 |
24 |
2 |
506 |
4086 |
708 |
23 |
0 |
| CDI |
0 |
0 |
0 |
49 |
719 |
8250 |
2809 |
3 |
| VCDI |
0 |
0 |
0 |
18 |
81 |
558 |
3400 |
1192 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
27006 |
3697 |
95 |
59 |
0 |
0 |
0 |
0 |
| OW |
22 |
1386 |
438 |
620 |
11 |
0 |
0 |
0 |
| VODI |
0 |
193 |
378 |
3802 |
1021 |
2 |
0 |
0 |
| ODI |
0 |
21 |
3 |
605 |
3822 |
679 |
22 |
0 |
| CDI |
0 |
3 |
0 |
57 |
946 |
8216 |
2617 |
4 |
| VCDI |
0 |
0 |
0 |
18 |
83 |
621 |
3593 |
1191 |
|
Date: 2025-08-11:
| 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 |
27356 |
3879 |
66 |
24 |
0 |
0 |
0 |
0 |
| OW |
5 |
1543 |
739 |
915 |
2 |
0 |
0 |
0 |
| VODI |
0 |
44 |
37 |
4295 |
470 |
0 |
0 |
0 |
| ODI |
0 |
6 |
1 |
152 |
4813 |
120 |
0 |
0 |
| CDI |
0 |
2 |
1 |
16 |
630 |
8887 |
91 |
0 |
| VCDI |
0 |
0 |
0 |
21 |
84 |
1262 |
5739 |
31 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
27332 |
3391 |
68 |
31 |
0 |
0 |
0 |
0 |
| OW |
29 |
1677 |
441 |
551 |
13 |
0 |
0 |
0 |
| VODI |
0 |
374 |
332 |
4236 |
823 |
10 |
0 |
0 |
| ODI |
0 |
30 |
2 |
550 |
3868 |
597 |
13 |
0 |
| CDI |
0 |
2 |
1 |
30 |
1209 |
8022 |
1878 |
0 |
| VCDI |
0 |
0 |
0 |
25 |
86 |
1640 |
3939 |
31 |
|
Date: 2025-08-13:
| 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 |
28054 |
3375 |
34 |
20 |
2 |
0 |
0 |
0 |
| OW |
25 |
1968 |
635 |
683 |
7 |
0 |
0 |
0 |
| VODI |
3 |
210 |
104 |
4264 |
370 |
0 |
0 |
0 |
| ODI |
0 |
5 |
0 |
396 |
4843 |
58 |
1 |
0 |
| CDI |
0 |
2 |
1 |
18 |
1686 |
6864 |
1012 |
0 |
| VCDI |
0 |
9 |
0 |
2 |
129 |
1069 |
4610 |
772 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
28032 |
2855 |
48 |
25 |
1 |
0 |
0 |
0 |
| OW |
45 |
1886 |
411 |
557 |
1 |
0 |
0 |
0 |
| VODI |
5 |
796 |
313 |
4022 |
622 |
0 |
1 |
0 |
| ODI |
0 |
20 |
1 |
730 |
4042 |
286 |
9 |
0 |
| CDI |
0 |
3 |
1 |
41 |
2256 |
6528 |
2165 |
2 |
| VCDI |
0 |
9 |
0 |
8 |
115 |
1177 |
3448 |
770 |
|
Date: 2025-08-15:
| 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 |
28506 |
2799 |
25 |
24 |
3 |
0 |
0 |
0 |
| OW |
207 |
2550 |
381 |
399 |
7 |
0 |
0 |
0 |
| VODI |
0 |
366 |
396 |
4213 |
186 |
0 |
0 |
0 |
| ODI |
0 |
14 |
0 |
611 |
4764 |
150 |
0 |
0 |
| CDI |
0 |
1 |
0 |
26 |
1757 |
6166 |
1119 |
0 |
| VCDI |
0 |
9 |
1 |
12 |
108 |
1349 |
4425 |
657 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
28413 |
2564 |
51 |
47 |
2 |
0 |
0 |
0 |
| OW |
261 |
2025 |
242 |
485 |
8 |
0 |
0 |
0 |
| VODI |
39 |
1116 |
494 |
3929 |
414 |
5 |
0 |
0 |
| ODI |
0 |
24 |
15 |
762 |
3385 |
286 |
4 |
0 |
| CDI |
0 |
1 |
0 |
44 |
2884 |
6203 |
1818 |
61 |
| VCDI |
0 |
9 |
1 |
18 |
132 |
1171 |
3722 |
596 |
|
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