Validation of sea ice concentration - American sector
Bulletin date: 2025-11-13
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-11-07:
| 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 |
9586 |
3449 |
265 |
381 |
58 |
4 |
0 |
0 |
| OW |
0 |
360 |
193 |
546 |
356 |
105 |
0 |
0 |
| VODI |
0 |
91 |
87 |
357 |
457 |
162 |
3 |
0 |
| ODI |
0 |
6 |
37 |
180 |
346 |
154 |
28 |
0 |
| CDI |
0 |
0 |
3 |
75 |
360 |
380 |
144 |
0 |
| VCDI |
0 |
0 |
0 |
18 |
420 |
1575 |
10565 |
15115 |
|
...date precedes bulletin
|
Date: 2025-11-09:
| 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 |
9424 |
3040 |
156 |
189 |
59 |
10 |
0 |
0 |
| OW |
10 |
454 |
182 |
545 |
303 |
155 |
3 |
0 |
| VODI |
0 |
203 |
71 |
468 |
457 |
196 |
26 |
0 |
| ODI |
0 |
48 |
27 |
193 |
352 |
242 |
36 |
0 |
| CDI |
0 |
14 |
18 |
63 |
367 |
469 |
200 |
0 |
| VCDI |
0 |
0 |
5 |
31 |
186 |
1474 |
10882 |
15308 |
|
...date precedes bulletin
|
Date: 2025-11-11:
| 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 |
9112 |
3022 |
153 |
192 |
56 |
0 |
0 |
0 |
| OW |
0 |
408 |
215 |
361 |
140 |
13 |
0 |
0 |
| VODI |
0 |
87 |
79 |
421 |
672 |
102 |
0 |
0 |
| ODI |
0 |
1 |
14 |
89 |
724 |
516 |
4 |
0 |
| CDI |
0 |
1 |
2 |
34 |
259 |
768 |
126 |
2 |
| VCDI |
0 |
0 |
1 |
14 |
65 |
966 |
7317 |
19930 |
|
...date precedes bulletin
|
Date: 2025-11-13:
| 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 |
9367 |
2631 |
134 |
182 |
56 |
0 |
0 |
0 |
| OW |
16 |
459 |
140 |
238 |
90 |
7 |
0 |
0 |
| VODI |
0 |
182 |
93 |
386 |
492 |
90 |
0 |
0 |
| ODI |
0 |
24 |
21 |
106 |
487 |
301 |
12 |
0 |
| CDI |
0 |
14 |
4 |
49 |
293 |
991 |
137 |
0 |
| VCDI |
0 |
9 |
6 |
34 |
94 |
1179 |
10187 |
17355 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9367 |
2594 |
129 |
188 |
69 |
2 |
0 |
0 |
| OW |
15 |
466 |
142 |
232 |
78 |
11 |
0 |
0 |
| VODI |
1 |
196 |
95 |
401 |
489 |
81 |
0 |
0 |
| ODI |
0 |
41 |
21 |
97 |
463 |
324 |
13 |
0 |
| CDI |
0 |
14 |
5 |
44 |
305 |
965 |
180 |
0 |
| VCDI |
0 |
8 |
6 |
33 |
108 |
1185 |
10143 |
17355 |
|
Date: 2025-11-15:
| 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 |
9090 |
2590 |
190 |
131 |
12 |
0 |
0 |
0 |
| OW |
0 |
397 |
175 |
324 |
133 |
3 |
0 |
0 |
| VODI |
0 |
131 |
105 |
378 |
368 |
127 |
2 |
0 |
| ODI |
0 |
3 |
11 |
123 |
189 |
241 |
35 |
0 |
| CDI |
0 |
0 |
1 |
54 |
148 |
780 |
185 |
0 |
| VCDI |
0 |
0 |
0 |
26 |
133 |
1696 |
13557 |
14528 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9089 |
2551 |
197 |
168 |
41 |
0 |
0 |
0 |
| OW |
1 |
430 |
168 |
271 |
118 |
16 |
0 |
0 |
| VODI |
0 |
130 |
100 |
402 |
355 |
98 |
5 |
0 |
| ODI |
0 |
10 |
16 |
127 |
197 |
234 |
20 |
0 |
| CDI |
0 |
0 |
1 |
43 |
147 |
686 |
192 |
0 |
| VCDI |
0 |
0 |
0 |
25 |
125 |
1813 |
13562 |
14528 |
|
Date: 2025-11-17:
| 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 |
8650 |
2709 |
109 |
72 |
3 |
0 |
0 |
0 |
| OW |
0 |
361 |
209 |
315 |
48 |
1 |
0 |
0 |
| VODI |
0 |
25 |
35 |
372 |
541 |
41 |
0 |
0 |
| ODI |
0 |
2 |
3 |
58 |
535 |
185 |
8 |
0 |
| CDI |
0 |
0 |
0 |
3 |
292 |
951 |
115 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
180 |
1860 |
11876 |
16306 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8650 |
2512 |
125 |
143 |
45 |
6 |
0 |
0 |
| OW |
0 |
424 |
124 |
253 |
184 |
25 |
0 |
0 |
| VODI |
0 |
135 |
85 |
303 |
493 |
168 |
3 |
0 |
| ODI |
0 |
24 |
17 |
108 |
344 |
196 |
6 |
0 |
| CDI |
0 |
2 |
5 |
12 |
253 |
412 |
89 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
280 |
2231 |
11901 |
16306 |
|
Date: 2025-11-19:
| 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 |
8618 |
2073 |
115 |
132 |
28 |
0 |
0 |
0 |
| OW |
0 |
347 |
130 |
230 |
112 |
5 |
0 |
0 |
| VODI |
0 |
187 |
85 |
334 |
466 |
110 |
0 |
0 |
| ODI |
0 |
41 |
13 |
78 |
414 |
334 |
5 |
0 |
| CDI |
0 |
13 |
4 |
25 |
251 |
740 |
49 |
0 |
| VCDI |
0 |
0 |
4 |
7 |
128 |
2884 |
13033 |
14871 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8618 |
2055 |
131 |
141 |
69 |
15 |
3 |
0 |
| OW |
0 |
388 |
103 |
178 |
110 |
33 |
7 |
0 |
| VODI |
0 |
159 |
94 |
333 |
463 |
189 |
6 |
0 |
| ODI |
0 |
41 |
16 |
139 |
412 |
357 |
19 |
0 |
| CDI |
0 |
18 |
7 |
15 |
221 |
620 |
45 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
124 |
2859 |
13007 |
14871 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8516 |
1848 |
101 |
154 |
120 |
55 |
17 |
0 |
| OW |
1 |
434 |
89 |
166 |
49 |
26 |
2 |
0 |
| VODI |
0 |
312 |
112 |
319 |
343 |
146 |
19 |
0 |
| ODI |
0 |
55 |
32 |
159 |
453 |
266 |
35 |
0 |
| CDI |
0 |
11 |
23 |
107 |
404 |
551 |
29 |
0 |
| VCDI |
0 |
0 |
0 |
17 |
354 |
2557 |
13064 |
14920 |
|
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