Validation of sea ice concentration - American sector
Bulletin date: 2025-04-17
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-04-11:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
1 |
3 |
0 |
0 |
0 |
| VODI |
0 |
6 |
5 |
16 |
16 |
3 |
5 |
0 |
| ODI |
0 |
11 |
12 |
19 |
24 |
16 |
20 |
1 |
| CDI |
0 |
9 |
36 |
114 |
77 |
118 |
312 |
13 |
| VCDI |
0 |
1 |
29 |
107 |
216 |
1322 |
14027 |
29327 |
|
...date precedes bulletin
|
Date: 2025-04-13:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
2 |
1 |
0 |
0 |
0 |
| VODI |
0 |
9 |
2 |
24 |
0 |
2 |
3 |
0 |
| ODI |
0 |
19 |
10 |
10 |
21 |
30 |
20 |
0 |
| CDI |
0 |
17 |
19 |
97 |
116 |
210 |
436 |
1 |
| VCDI |
0 |
24 |
18 |
132 |
190 |
1296 |
16962 |
26195 |
|
...date precedes bulletin
|
Date: 2025-04-15:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
2 |
3 |
8 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
20 |
53 |
7 |
5 |
0 |
| ODI |
0 |
13 |
11 |
32 |
95 |
50 |
24 |
0 |
| CDI |
0 |
1 |
9 |
106 |
196 |
337 |
405 |
2 |
| VCDI |
0 |
7 |
14 |
79 |
309 |
1658 |
16397 |
26023 |
|
...date precedes bulletin
|
Date: 2025-04-17:
| 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 |
0 |
0 |
5 |
6 |
1 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
24 |
7 |
1 |
0 |
0 |
| VODI |
0 |
1 |
3 |
43 |
51 |
27 |
2 |
0 |
| ODI |
0 |
1 |
1 |
29 |
101 |
94 |
35 |
0 |
| CDI |
0 |
4 |
1 |
40 |
199 |
474 |
325 |
0 |
| VCDI |
0 |
2 |
2 |
70 |
385 |
1575 |
16312 |
26045 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
5 |
8 |
1 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
22 |
8 |
2 |
0 |
0 |
| VODI |
0 |
1 |
3 |
39 |
56 |
24 |
2 |
0 |
| ODI |
0 |
1 |
1 |
35 |
95 |
95 |
42 |
0 |
| CDI |
0 |
4 |
1 |
48 |
195 |
489 |
324 |
0 |
| VCDI |
0 |
2 |
2 |
60 |
389 |
1561 |
16306 |
26045 |
|
Date: 2025-04-19:
| 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 |
0 |
0 |
0 |
8 |
0 |
0 |
0 |
0 |
| OW |
0 |
4 |
5 |
29 |
9 |
0 |
0 |
0 |
| VODI |
0 |
14 |
10 |
39 |
54 |
41 |
7 |
0 |
| ODI |
0 |
10 |
8 |
41 |
68 |
130 |
36 |
0 |
| CDI |
0 |
8 |
11 |
33 |
149 |
301 |
533 |
9 |
| VCDI |
0 |
9 |
9 |
70 |
435 |
1563 |
16815 |
25408 |
|
|
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 |
12 |
0 |
0 |
0 |
0 |
| OW |
0 |
3 |
5 |
27 |
12 |
1 |
0 |
0 |
| VODI |
0 |
15 |
8 |
39 |
57 |
44 |
5 |
0 |
| ODI |
0 |
9 |
9 |
33 |
76 |
131 |
49 |
0 |
| CDI |
0 |
10 |
10 |
32 |
145 |
307 |
533 |
11 |
| VCDI |
0 |
8 |
11 |
77 |
425 |
1552 |
16804 |
25406 |
|
Date: 2025-04-21:
| 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 |
0 |
0 |
1 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
11 |
2 |
6 |
3 |
0 |
0 |
0 |
| VODI |
0 |
16 |
19 |
77 |
20 |
15 |
1 |
0 |
| ODI |
0 |
3 |
3 |
43 |
82 |
120 |
34 |
0 |
| CDI |
0 |
0 |
6 |
29 |
234 |
542 |
624 |
26 |
| VCDI |
0 |
0 |
1 |
38 |
214 |
1727 |
18780 |
23189 |
|
|
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 |
7 |
24 |
7 |
2 |
0 |
0 |
| VODI |
0 |
11 |
5 |
46 |
34 |
42 |
3 |
0 |
| ODI |
0 |
11 |
7 |
30 |
67 |
113 |
82 |
0 |
| CDI |
0 |
2 |
13 |
56 |
137 |
443 |
594 |
27 |
| VCDI |
0 |
0 |
0 |
37 |
308 |
1804 |
18760 |
23188 |
|
Date: 2025-04-23:
| 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 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
0 |
| OW |
0 |
21 |
0 |
2 |
9 |
0 |
0 |
0 |
| VODI |
0 |
18 |
24 |
38 |
38 |
18 |
3 |
0 |
| ODI |
0 |
5 |
5 |
72 |
121 |
105 |
81 |
0 |
| CDI |
0 |
3 |
3 |
60 |
184 |
513 |
824 |
12 |
| VCDI |
0 |
0 |
0 |
25 |
261 |
1137 |
17802 |
24481 |
|
|
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 |
1 |
0 |
0 |
0 |
0 |
| OW |
0 |
6 |
4 |
7 |
18 |
3 |
0 |
0 |
| VODI |
0 |
17 |
10 |
21 |
70 |
36 |
28 |
0 |
| ODI |
0 |
16 |
12 |
51 |
88 |
137 |
143 |
8 |
| CDI |
0 |
8 |
6 |
82 |
101 |
339 |
716 |
16 |
| VCDI |
0 |
0 |
0 |
35 |
337 |
1258 |
17823 |
24469 |
|
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 |
|
|
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 |
8 |
0 |
0 |
| OW |
0 |
3 |
0 |
0 |
7 |
35 |
2 |
0 |
| VODI |
0 |
34 |
11 |
13 |
52 |
73 |
70 |
0 |
| ODI |
0 |
29 |
13 |
46 |
79 |
122 |
207 |
0 |
| CDI |
0 |
5 |
11 |
68 |
186 |
349 |
834 |
0 |
| VCDI |
0 |
0 |
0 |
44 |
267 |
1057 |
17283 |
24958 |
|
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