Validation of sea ice concentration - American sector
Bulletin date: 2025-05-01
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
40 |
2 |
0 |
0 |
9 |
0 |
0 |
| VODI |
0 |
23 |
17 |
22 |
44 |
31 |
7 |
0 |
| ODI |
0 |
7 |
13 |
65 |
147 |
143 |
118 |
0 |
| CDI |
0 |
1 |
3 |
60 |
157 |
502 |
998 |
29 |
| VCDI |
0 |
0 |
0 |
24 |
243 |
959 |
17273 |
24929 |
|
...date precedes bulletin
|
Date: 2025-04-27:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
1 |
5 |
37 |
4 |
0 |
0 |
0 |
| VODI |
0 |
22 |
2 |
74 |
66 |
57 |
32 |
0 |
| ODI |
0 |
14 |
14 |
78 |
147 |
162 |
129 |
0 |
| CDI |
0 |
6 |
16 |
91 |
166 |
383 |
1247 |
0 |
| VCDI |
0 |
1 |
5 |
74 |
229 |
987 |
17707 |
24110 |
|
...date precedes bulletin
|
Date: 2025-04-29:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
11 |
8 |
14 |
9 |
0 |
0 |
0 |
| VODI |
0 |
47 |
41 |
142 |
75 |
7 |
0 |
0 |
| ODI |
0 |
15 |
16 |
76 |
169 |
88 |
11 |
0 |
| CDI |
0 |
4 |
19 |
65 |
196 |
618 |
429 |
4 |
| VCDI |
0 |
0 |
0 |
21 |
253 |
1440 |
16609 |
25479 |
|
...date precedes bulletin
|
Date: 2025-05-01:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
10 |
2 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
25 |
23 |
179 |
83 |
4 |
3 |
0 |
| ODI |
0 |
12 |
7 |
115 |
225 |
69 |
27 |
0 |
| CDI |
0 |
7 |
6 |
88 |
253 |
575 |
535 |
8 |
| VCDI |
0 |
0 |
1 |
11 |
236 |
1632 |
16087 |
25643 |
|
|
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 |
5 |
3 |
3 |
0 |
0 |
0 |
0 |
| VODI |
0 |
31 |
22 |
185 |
73 |
6 |
3 |
0 |
| ODI |
0 |
11 |
7 |
115 |
248 |
73 |
35 |
0 |
| CDI |
0 |
7 |
4 |
80 |
272 |
591 |
659 |
6 |
| VCDI |
0 |
0 |
3 |
10 |
204 |
1610 |
15955 |
25645 |
|
Date: 2025-05-03:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
3 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
10 |
14 |
113 |
92 |
10 |
2 |
0 |
| ODI |
0 |
7 |
4 |
107 |
263 |
103 |
36 |
0 |
| CDI |
0 |
3 |
5 |
42 |
289 |
612 |
793 |
13 |
| VCDI |
0 |
0 |
0 |
21 |
211 |
1348 |
17925 |
23840 |
|
|
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 |
2 |
2 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
12 |
12 |
107 |
94 |
15 |
1 |
0 |
| ODI |
0 |
6 |
4 |
115 |
259 |
104 |
45 |
0 |
| CDI |
0 |
3 |
5 |
45 |
320 |
621 |
980 |
22 |
| VCDI |
0 |
0 |
0 |
16 |
182 |
1333 |
17730 |
23831 |
|
Date: 2025-05-05:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
12 |
13 |
90 |
29 |
8 |
0 |
0 |
| ODI |
0 |
3 |
7 |
80 |
324 |
109 |
18 |
0 |
| CDI |
0 |
0 |
4 |
17 |
301 |
895 |
427 |
1 |
| VCDI |
0 |
0 |
0 |
0 |
82 |
1371 |
16696 |
25379 |
|
|
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 |
2 |
3 |
1 |
0 |
1 |
0 |
0 |
| VODI |
0 |
10 |
10 |
73 |
67 |
38 |
0 |
0 |
| ODI |
0 |
3 |
7 |
88 |
217 |
200 |
62 |
0 |
| CDI |
0 |
0 |
4 |
22 |
357 |
812 |
1378 |
2 |
| VCDI |
0 |
0 |
0 |
3 |
95 |
1332 |
15701 |
25378 |
|
Date: 2025-05-07:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
7 |
3 |
4 |
2 |
0 |
0 |
0 |
| VODI |
0 |
40 |
26 |
92 |
80 |
16 |
2 |
0 |
| ODI |
0 |
11 |
13 |
89 |
247 |
115 |
23 |
0 |
| CDI |
0 |
5 |
13 |
84 |
341 |
689 |
424 |
4 |
| VCDI |
0 |
1 |
3 |
23 |
185 |
1257 |
17915 |
24152 |
|
|
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 |
1 |
4 |
3 |
0 |
0 |
0 |
| VODI |
0 |
32 |
24 |
95 |
86 |
38 |
5 |
0 |
| ODI |
0 |
14 |
22 |
104 |
292 |
143 |
74 |
2 |
| CDI |
0 |
4 |
8 |
71 |
366 |
893 |
1683 |
7 |
| VCDI |
0 |
1 |
3 |
18 |
108 |
1003 |
16602 |
24147 |
|
Date: 2025-05-09:
| 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 |
0 |
0 |
0 |
0 |
1 |
1 |
0 |
0 |
| OW |
0 |
34 |
7 |
6 |
6 |
9 |
0 |
0 |
| VODI |
0 |
95 |
49 |
103 |
42 |
17 |
10 |
0 |
| ODI |
0 |
57 |
41 |
156 |
220 |
84 |
61 |
0 |
| CDI |
0 |
55 |
40 |
143 |
430 |
758 |
421 |
0 |
| VCDI |
0 |
10 |
5 |
108 |
1156 |
2495 |
18550 |
20696 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
1 |
0 |
1 |
1 |
0 |
0 |
| OW |
0 |
42 |
9 |
8 |
6 |
13 |
3 |
0 |
| VODI |
0 |
93 |
61 |
98 |
44 |
20 |
22 |
0 |
| ODI |
0 |
58 |
36 |
193 |
269 |
178 |
88 |
0 |
| CDI |
0 |
45 |
27 |
134 |
442 |
953 |
1690 |
2 |
| VCDI |
0 |
13 |
8 |
83 |
1093 |
2199 |
17239 |
20694 |
|
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