Validation of sea ice concentration - American sector
Bulletin date: 2025-04-24
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-04-18:
| 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 |
0 |
3 |
5 |
3 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
3 |
30 |
9 |
0 |
0 |
0 |
| VODI |
0 |
6 |
12 |
48 |
52 |
36 |
6 |
0 |
| ODI |
0 |
4 |
5 |
41 |
97 |
124 |
43 |
0 |
| CDI |
0 |
5 |
7 |
50 |
199 |
391 |
441 |
1 |
| VCDI |
0 |
1 |
10 |
70 |
409 |
1519 |
16947 |
25289 |
|
...date precedes bulletin
|
Date: 2025-04-20:
| 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 |
0 |
0 |
0 |
2 |
1 |
0 |
0 |
0 |
| OW |
0 |
5 |
10 |
29 |
9 |
0 |
0 |
0 |
| VODI |
0 |
15 |
10 |
36 |
52 |
38 |
4 |
0 |
| ODI |
0 |
6 |
9 |
39 |
62 |
110 |
83 |
0 |
| CDI |
0 |
2 |
5 |
49 |
88 |
216 |
610 |
0 |
| VCDI |
0 |
0 |
0 |
79 |
377 |
1756 |
17700 |
24464 |
|
...date precedes bulletin
|
Date: 2025-04-22:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
8 |
0 |
4 |
5 |
0 |
0 |
0 |
| VODI |
0 |
16 |
19 |
45 |
30 |
16 |
0 |
0 |
| ODI |
0 |
3 |
6 |
60 |
87 |
104 |
56 |
0 |
| CDI |
0 |
4 |
8 |
65 |
223 |
533 |
836 |
11 |
| VCDI |
0 |
0 |
0 |
21 |
218 |
1304 |
17781 |
24403 |
|
...date precedes bulletin
|
Date: 2025-04-24:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
39 |
1 |
0 |
14 |
0 |
0 |
0 |
| VODI |
0 |
19 |
28 |
20 |
37 |
38 |
8 |
0 |
| ODI |
0 |
7 |
10 |
43 |
119 |
132 |
128 |
0 |
| CDI |
0 |
1 |
3 |
23 |
192 |
409 |
954 |
3 |
| VCDI |
0 |
0 |
0 |
4 |
271 |
1104 |
18279 |
23980 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
38 |
0 |
1 |
13 |
1 |
0 |
0 |
| VODI |
0 |
20 |
31 |
18 |
37 |
41 |
17 |
0 |
| ODI |
0 |
6 |
8 |
44 |
129 |
144 |
137 |
0 |
| CDI |
0 |
2 |
3 |
23 |
195 |
437 |
1058 |
2 |
| VCDI |
0 |
0 |
0 |
4 |
259 |
1060 |
18157 |
23981 |
|
Date: 2025-04-26:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
37 |
3 |
1 |
6 |
1 |
0 |
0 |
| VODI |
0 |
13 |
26 |
41 |
45 |
49 |
19 |
0 |
| ODI |
0 |
5 |
18 |
91 |
141 |
131 |
150 |
0 |
| CDI |
0 |
0 |
6 |
92 |
158 |
401 |
1218 |
2 |
| VCDI |
0 |
0 |
1 |
36 |
235 |
914 |
18454 |
23572 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
40 |
2 |
1 |
3 |
0 |
0 |
0 |
| VODI |
0 |
9 |
26 |
40 |
55 |
43 |
29 |
0 |
| ODI |
0 |
6 |
19 |
94 |
143 |
132 |
177 |
0 |
| CDI |
0 |
0 |
6 |
92 |
173 |
418 |
1331 |
5 |
| VCDI |
0 |
0 |
1 |
34 |
211 |
903 |
18304 |
23569 |
|
Date: 2025-04-28:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
13 |
4 |
9 |
0 |
0 |
0 |
0 |
| VODI |
0 |
45 |
43 |
193 |
37 |
5 |
2 |
0 |
| ODI |
0 |
9 |
19 |
85 |
172 |
61 |
26 |
0 |
| CDI |
0 |
3 |
12 |
50 |
209 |
566 |
427 |
8 |
| VCDI |
0 |
0 |
0 |
24 |
272 |
1218 |
16350 |
26004 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
8 |
8 |
35 |
0 |
1 |
0 |
0 |
| VODI |
0 |
34 |
15 |
115 |
35 |
47 |
27 |
0 |
| ODI |
0 |
12 |
21 |
81 |
130 |
160 |
139 |
10 |
| CDI |
0 |
16 |
28 |
84 |
185 |
542 |
1278 |
40 |
| VCDI |
0 |
0 |
6 |
46 |
340 |
1100 |
15361 |
25962 |
|
Date: 2025-04-30:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
14 |
5 |
10 |
16 |
0 |
0 |
0 |
| VODI |
0 |
32 |
16 |
147 |
117 |
7 |
1 |
0 |
| ODI |
0 |
7 |
5 |
95 |
155 |
93 |
17 |
0 |
| CDI |
0 |
6 |
4 |
77 |
192 |
518 |
583 |
6 |
| VCDI |
0 |
0 |
0 |
18 |
252 |
1562 |
16831 |
25080 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
6 |
2 |
14 |
27 |
4 |
0 |
0 |
| VODI |
0 |
36 |
14 |
79 |
102 |
53 |
44 |
0 |
| ODI |
0 |
12 |
6 |
106 |
161 |
175 |
145 |
5 |
| CDI |
0 |
4 |
8 |
112 |
227 |
646 |
1385 |
24 |
| VCDI |
0 |
1 |
0 |
36 |
215 |
1302 |
15858 |
25057 |
|
Date: 2025-05-02:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
6 |
2 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
12 |
25 |
141 |
100 |
8 |
5 |
0 |
| ODI |
0 |
9 |
1 |
118 |
265 |
92 |
38 |
0 |
| CDI |
0 |
5 |
5 |
71 |
253 |
502 |
586 |
9 |
| VCDI |
0 |
0 |
0 |
35 |
210 |
1458 |
15999 |
25911 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
3 |
7 |
35 |
7 |
0 |
0 |
0 |
| VODI |
0 |
13 |
16 |
78 |
131 |
37 |
42 |
0 |
| ODI |
0 |
13 |
7 |
86 |
244 |
133 |
111 |
7 |
| CDI |
0 |
2 |
3 |
112 |
257 |
760 |
1649 |
95 |
| VCDI |
0 |
0 |
0 |
54 |
189 |
1130 |
14826 |
25818 |
|
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