Validation of sea ice concentration - American sector
Bulletin date: 2025-11-27
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-11-21:
| 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 |
8517 |
1992 |
110 |
101 |
25 |
2 |
0 |
0 |
| OW |
0 |
345 |
99 |
178 |
78 |
20 |
0 |
0 |
| VODI |
0 |
273 |
96 |
358 |
349 |
75 |
2 |
0 |
| ODI |
0 |
48 |
44 |
177 |
449 |
158 |
20 |
0 |
| CDI |
0 |
2 |
8 |
100 |
485 |
453 |
34 |
0 |
| VCDI |
0 |
0 |
0 |
8 |
337 |
2893 |
13110 |
14920 |
|
...date precedes bulletin
|
Date: 2025-11-23:
| 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 |
8513 |
1394 |
121 |
148 |
115 |
16 |
0 |
0 |
| OW |
0 |
299 |
69 |
197 |
97 |
52 |
1 |
0 |
| VODI |
0 |
157 |
55 |
203 |
344 |
219 |
1 |
0 |
| ODI |
0 |
74 |
37 |
132 |
366 |
345 |
41 |
0 |
| CDI |
0 |
17 |
16 |
74 |
385 |
659 |
101 |
0 |
| VCDI |
0 |
1 |
2 |
9 |
167 |
2705 |
12265 |
16469 |
|
...date precedes bulletin
|
Date: 2025-11-25:
| 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 |
8471 |
1394 |
92 |
98 |
42 |
23 |
0 |
0 |
| OW |
0 |
451 |
114 |
145 |
37 |
23 |
0 |
0 |
| VODI |
0 |
93 |
109 |
364 |
210 |
15 |
13 |
0 |
| ODI |
0 |
5 |
9 |
115 |
418 |
178 |
25 |
0 |
| CDI |
0 |
3 |
3 |
49 |
463 |
789 |
160 |
0 |
| VCDI |
0 |
0 |
2 |
15 |
181 |
1698 |
11085 |
18974 |
|
...date precedes bulletin
|
Date: 2025-11-27:
| 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 |
8460 |
1173 |
80 |
101 |
32 |
0 |
0 |
0 |
| OW |
3 |
388 |
93 |
122 |
118 |
8 |
0 |
0 |
| VODI |
0 |
172 |
102 |
265 |
293 |
72 |
7 |
0 |
| ODI |
0 |
47 |
35 |
155 |
355 |
147 |
31 |
0 |
| CDI |
0 |
2 |
7 |
54 |
324 |
524 |
82 |
0 |
| VCDI |
0 |
0 |
1 |
15 |
155 |
2203 |
14429 |
15811 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8457 |
1295 |
81 |
92 |
20 |
0 |
0 |
0 |
| OW |
6 |
280 |
104 |
145 |
121 |
12 |
0 |
0 |
| VODI |
0 |
163 |
87 |
264 |
297 |
63 |
16 |
0 |
| ODI |
0 |
39 |
33 |
138 |
381 |
172 |
34 |
0 |
| CDI |
0 |
5 |
11 |
56 |
298 |
544 |
81 |
0 |
| VCDI |
0 |
0 |
2 |
17 |
160 |
2163 |
14418 |
15811 |
|
Date: 2025-11-29:
| 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 |
7104 |
1906 |
78 |
88 |
61 |
12 |
0 |
0 |
| OW |
37 |
342 |
120 |
149 |
164 |
68 |
0 |
0 |
| VODI |
1 |
200 |
94 |
187 |
305 |
262 |
10 |
0 |
| ODI |
0 |
106 |
23 |
124 |
254 |
300 |
24 |
0 |
| CDI |
0 |
19 |
28 |
108 |
267 |
530 |
89 |
0 |
| VCDI |
0 |
0 |
1 |
17 |
186 |
2563 |
15088 |
14951 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7102 |
2005 |
92 |
99 |
74 |
19 |
0 |
0 |
| OW |
39 |
281 |
111 |
152 |
145 |
66 |
2 |
0 |
| VODI |
1 |
177 |
94 |
205 |
309 |
265 |
8 |
0 |
| ODI |
0 |
93 |
25 |
104 |
273 |
313 |
33 |
0 |
| CDI |
0 |
17 |
21 |
94 |
253 |
520 |
85 |
0 |
| VCDI |
0 |
0 |
1 |
19 |
183 |
2552 |
15083 |
14951 |
|
Date: 2025-12-01:
| 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 |
4090 |
4229 |
97 |
116 |
8 |
2 |
0 |
0 |
| OW |
0 |
302 |
167 |
199 |
120 |
6 |
0 |
0 |
| VODI |
0 |
53 |
72 |
305 |
308 |
16 |
0 |
0 |
| ODI |
0 |
6 |
7 |
96 |
512 |
168 |
1 |
0 |
| CDI |
0 |
0 |
0 |
24 |
300 |
1099 |
35 |
5 |
| VCDI |
0 |
0 |
0 |
2 |
85 |
2691 |
15359 |
15386 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
4090 |
4139 |
107 |
187 |
48 |
11 |
0 |
0 |
| OW |
0 |
301 |
97 |
166 |
274 |
28 |
0 |
0 |
| VODI |
0 |
117 |
100 |
210 |
435 |
398 |
2 |
0 |
| ODI |
0 |
26 |
31 |
99 |
271 |
367 |
14 |
0 |
| CDI |
0 |
7 |
8 |
53 |
138 |
547 |
112 |
13 |
| VCDI |
0 |
0 |
0 |
27 |
167 |
2631 |
15267 |
15378 |
|
Date: 2025-12-03:
| 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 |
3429 |
4243 |
130 |
124 |
26 |
0 |
0 |
0 |
| OW |
6 |
298 |
99 |
207 |
126 |
0 |
0 |
0 |
| VODI |
0 |
89 |
69 |
181 |
428 |
22 |
0 |
0 |
| ODI |
0 |
4 |
10 |
97 |
453 |
228 |
0 |
0 |
| CDI |
0 |
4 |
5 |
87 |
328 |
585 |
15 |
0 |
| VCDI |
0 |
0 |
1 |
57 |
139 |
2181 |
15385 |
16810 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
3429 |
4176 |
120 |
149 |
55 |
1 |
0 |
0 |
| OW |
6 |
310 |
79 |
170 |
184 |
24 |
0 |
0 |
| VODI |
0 |
129 |
84 |
164 |
418 |
213 |
0 |
0 |
| ODI |
0 |
15 |
25 |
138 |
437 |
393 |
10 |
0 |
| CDI |
0 |
6 |
4 |
81 |
232 |
481 |
82 |
0 |
| VCDI |
0 |
2 |
2 |
51 |
174 |
1904 |
15308 |
16810 |
|
Date: 2025-12-05:
| 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 |
3086 |
3915 |
101 |
91 |
26 |
0 |
0 |
0 |
| OW |
48 |
454 |
69 |
160 |
93 |
8 |
0 |
0 |
| VODI |
0 |
183 |
73 |
174 |
259 |
85 |
1 |
0 |
| ODI |
0 |
38 |
15 |
91 |
455 |
166 |
1 |
0 |
| CDI |
0 |
4 |
2 |
70 |
457 |
509 |
28 |
0 |
| VCDI |
0 |
5 |
1 |
38 |
329 |
1919 |
11793 |
21119 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
2823 |
3721 |
105 |
118 |
58 |
4 |
0 |
0 |
| OW |
311 |
665 |
57 |
146 |
76 |
28 |
0 |
0 |
| VODI |
0 |
183 |
77 |
141 |
234 |
138 |
9 |
1 |
| ODI |
0 |
21 |
20 |
119 |
362 |
329 |
29 |
8 |
| CDI |
0 |
5 |
1 |
62 |
433 |
449 |
86 |
56 |
| VCDI |
0 |
4 |
1 |
38 |
456 |
1739 |
11699 |
21054 |
|
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