Validation of sea ice concentration - American sector
Bulletin date: 2025-05-08
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-05-04:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
3 |
0 |
0 |
0 |
| VODI |
0 |
4 |
10 |
50 |
128 |
23 |
0 |
0 |
| ODI |
0 |
4 |
4 |
93 |
267 |
114 |
35 |
0 |
| CDI |
0 |
1 |
0 |
50 |
355 |
715 |
947 |
5 |
| VCDI |
0 |
0 |
0 |
2 |
224 |
1285 |
17057 |
24490 |
|
...date precedes bulletin
|
Date: 2025-05-06:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
1 |
1 |
3 |
0 |
0 |
0 |
0 |
| VODI |
0 |
16 |
15 |
87 |
56 |
4 |
3 |
0 |
| ODI |
0 |
2 |
16 |
60 |
278 |
124 |
14 |
0 |
| CDI |
0 |
2 |
2 |
25 |
313 |
844 |
451 |
0 |
| VCDI |
0 |
5 |
3 |
29 |
133 |
1183 |
16983 |
25213 |
|
...date precedes bulletin
|
Date: 2025-05-08:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
13 |
2 |
10 |
8 |
2 |
0 |
0 |
| VODI |
0 |
30 |
33 |
108 |
83 |
19 |
6 |
0 |
| ODI |
0 |
23 |
16 |
133 |
222 |
94 |
61 |
0 |
| CDI |
0 |
15 |
23 |
120 |
383 |
707 |
427 |
0 |
| VCDI |
0 |
0 |
0 |
34 |
215 |
1570 |
19257 |
22252 |
|
|
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 |
12 |
3 |
10 |
7 |
1 |
0 |
0 |
| VODI |
0 |
31 |
31 |
119 |
87 |
21 |
8 |
0 |
| ODI |
0 |
24 |
19 |
137 |
225 |
106 |
65 |
0 |
| CDI |
0 |
14 |
21 |
105 |
390 |
705 |
504 |
0 |
| VCDI |
0 |
0 |
0 |
34 |
202 |
1559 |
19174 |
22252 |
|
Date: 2025-05-10:
| 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 |
76 |
14 |
12 |
4 |
7 |
0 |
0 |
| VODI |
0 |
117 |
55 |
134 |
42 |
16 |
9 |
0 |
| ODI |
0 |
43 |
46 |
169 |
185 |
82 |
50 |
0 |
| CDI |
0 |
41 |
36 |
192 |
388 |
576 |
508 |
0 |
| VCDI |
0 |
1 |
3 |
51 |
235 |
1928 |
23532 |
17314 |
|
|
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 |
74 |
14 |
12 |
4 |
5 |
0 |
0 |
| VODI |
0 |
114 |
57 |
137 |
44 |
18 |
10 |
0 |
| ODI |
0 |
55 |
46 |
167 |
205 |
70 |
50 |
0 |
| CDI |
0 |
35 |
34 |
182 |
386 |
668 |
593 |
0 |
| VCDI |
0 |
0 |
3 |
60 |
215 |
1848 |
23446 |
17314 |
|
Date: 2025-05-12:
| 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 |
140 |
16 |
6 |
0 |
0 |
0 |
0 |
| VODI |
0 |
156 |
65 |
202 |
32 |
8 |
8 |
0 |
| ODI |
0 |
18 |
41 |
242 |
359 |
104 |
36 |
0 |
| CDI |
0 |
2 |
2 |
72 |
566 |
1196 |
617 |
11 |
| VCDI |
0 |
0 |
0 |
6 |
66 |
2243 |
23122 |
16530 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
1 |
1 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
46 |
8 |
18 |
1 |
0 |
0 |
0 |
| VODI |
0 |
111 |
39 |
155 |
55 |
37 |
6 |
0 |
| ODI |
0 |
81 |
29 |
163 |
197 |
96 |
68 |
0 |
| CDI |
0 |
77 |
47 |
172 |
566 |
713 |
1122 |
37 |
| VCDI |
0 |
0 |
0 |
20 |
204 |
2705 |
22587 |
16504 |
|
Date: 2025-05-14:
| 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 |
50 |
1 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
205 |
18 |
12 |
1 |
0 |
0 |
0 |
| VODI |
0 |
139 |
52 |
126 |
111 |
21 |
15 |
0 |
| ODI |
0 |
49 |
24 |
173 |
380 |
160 |
58 |
0 |
| CDI |
0 |
6 |
8 |
89 |
617 |
1365 |
687 |
1 |
| VCDI |
0 |
0 |
1 |
14 |
245 |
5428 |
25084 |
10726 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
23 |
2 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
81 |
13 |
10 |
1 |
0 |
0 |
0 |
| VODI |
0 |
126 |
35 |
104 |
88 |
41 |
9 |
0 |
| ODI |
0 |
108 |
26 |
134 |
315 |
168 |
85 |
0 |
| CDI |
0 |
110 |
25 |
141 |
604 |
1358 |
1241 |
1 |
| VCDI |
0 |
1 |
3 |
25 |
346 |
5407 |
24509 |
10726 |
|
Date: 2025-05-16:
| 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 |
103 |
2 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
235 |
21 |
44 |
5 |
0 |
2 |
0 |
| VODI |
0 |
127 |
64 |
141 |
159 |
42 |
18 |
0 |
| ODI |
0 |
48 |
34 |
216 |
342 |
137 |
93 |
0 |
| CDI |
0 |
38 |
25 |
120 |
441 |
965 |
952 |
1 |
| VCDI |
0 |
129 |
15 |
145 |
362 |
2783 |
26198 |
11859 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
67 |
1 |
1 |
0 |
1 |
0 |
0 |
| OW |
0 |
109 |
13 |
15 |
7 |
3 |
3 |
0 |
| VODI |
0 |
111 |
28 |
77 |
89 |
56 |
38 |
0 |
| ODI |
0 |
110 |
51 |
215 |
296 |
145 |
181 |
0 |
| CDI |
0 |
210 |
51 |
229 |
619 |
1163 |
1506 |
5 |
| VCDI |
0 |
73 |
17 |
129 |
298 |
2559 |
25535 |
11855 |
|
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