Validation of sea ice concentration - American sector
Bulletin date: 2025-05-22
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
7476 |
2743 |
59 |
52 |
9 |
0 |
0 |
0 |
| OW |
0 |
1871 |
195 |
275 |
46 |
6 |
2 |
0 |
| VODI |
0 |
217 |
156 |
728 |
612 |
53 |
29 |
0 |
| ODI |
0 |
6 |
7 |
228 |
626 |
197 |
66 |
0 |
| CDI |
0 |
26 |
2 |
112 |
837 |
1155 |
780 |
13 |
| VCDI |
0 |
114 |
15 |
118 |
590 |
2700 |
17831 |
21279 |
|
...date precedes bulletin
|
Date: 2025-05-18:
| 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 |
7947 |
2377 |
47 |
70 |
6 |
1 |
0 |
0 |
| OW |
14 |
1982 |
157 |
389 |
52 |
14 |
0 |
0 |
| VODI |
0 |
214 |
64 |
655 |
643 |
73 |
5 |
2 |
| ODI |
0 |
3 |
15 |
261 |
574 |
252 |
51 |
25 |
| CDI |
0 |
0 |
0 |
133 |
810 |
1122 |
642 |
313 |
| VCDI |
0 |
0 |
0 |
7 |
406 |
2793 |
15961 |
23151 |
|
...date precedes bulletin
|
Date: 2025-05-20:
| 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 |
8069 |
3375 |
76 |
81 |
13 |
1 |
0 |
0 |
| OW |
7 |
1186 |
256 |
326 |
43 |
8 |
0 |
0 |
| VODI |
0 |
42 |
54 |
832 |
427 |
48 |
0 |
0 |
| ODI |
0 |
10 |
1 |
245 |
781 |
145 |
12 |
0 |
| CDI |
0 |
0 |
0 |
116 |
845 |
1638 |
220 |
72 |
| VCDI |
0 |
0 |
0 |
26 |
168 |
2819 |
15849 |
23440 |
|
...date precedes bulletin
|
Date: 2025-05-22:
| 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 |
8986 |
2749 |
89 |
94 |
5 |
8 |
0 |
0 |
| OW |
133 |
921 |
200 |
297 |
64 |
23 |
1 |
0 |
| VODI |
0 |
80 |
123 |
855 |
494 |
76 |
3 |
0 |
| ODI |
0 |
21 |
12 |
356 |
544 |
176 |
31 |
1 |
| CDI |
0 |
0 |
2 |
195 |
882 |
1671 |
396 |
171 |
| VCDI |
0 |
0 |
0 |
12 |
251 |
2528 |
12958 |
25823 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8936 |
2770 |
92 |
115 |
15 |
11 |
0 |
0 |
| OW |
183 |
895 |
180 |
267 |
67 |
23 |
0 |
0 |
| VODI |
0 |
90 |
137 |
826 |
475 |
67 |
3 |
0 |
| ODI |
0 |
16 |
15 |
363 |
521 |
206 |
35 |
1 |
| CDI |
0 |
0 |
2 |
225 |
904 |
1664 |
357 |
202 |
| VCDI |
0 |
0 |
0 |
13 |
258 |
2511 |
12994 |
25792 |
|
Date: 2025-05-24:
| 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 |
9152 |
2800 |
88 |
129 |
23 |
5 |
0 |
0 |
| OW |
10 |
943 |
158 |
310 |
97 |
15 |
0 |
0 |
| VODI |
0 |
199 |
184 |
869 |
501 |
112 |
5 |
0 |
| ODI |
0 |
17 |
31 |
336 |
507 |
270 |
21 |
0 |
| CDI |
0 |
0 |
3 |
272 |
814 |
1666 |
387 |
37 |
| VCDI |
0 |
0 |
0 |
37 |
334 |
3570 |
13254 |
24075 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9093 |
2803 |
79 |
164 |
34 |
5 |
0 |
0 |
| OW |
69 |
923 |
187 |
244 |
92 |
16 |
1 |
0 |
| VODI |
0 |
211 |
158 |
851 |
483 |
115 |
6 |
0 |
| ODI |
0 |
22 |
35 |
352 |
489 |
264 |
23 |
0 |
| CDI |
0 |
0 |
5 |
304 |
823 |
1740 |
397 |
20 |
| VCDI |
0 |
0 |
0 |
38 |
355 |
3498 |
13240 |
24092 |
|
Date: 2025-05-26:
| 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 |
9259 |
3227 |
75 |
104 |
23 |
0 |
1 |
0 |
| OW |
0 |
831 |
306 |
379 |
70 |
8 |
2 |
0 |
| VODI |
0 |
58 |
33 |
1178 |
447 |
38 |
6 |
0 |
| ODI |
0 |
5 |
3 |
180 |
867 |
177 |
23 |
0 |
| CDI |
0 |
9 |
0 |
83 |
1035 |
2521 |
273 |
11 |
| VCDI |
0 |
12 |
0 |
3 |
226 |
3499 |
18839 |
17420 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9247 |
2813 |
74 |
157 |
50 |
1 |
1 |
0 |
| OW |
12 |
926 |
154 |
323 |
117 |
29 |
4 |
0 |
| VODI |
0 |
315 |
139 |
796 |
495 |
155 |
13 |
0 |
| ODI |
0 |
52 |
40 |
337 |
477 |
235 |
46 |
0 |
| CDI |
0 |
23 |
10 |
294 |
975 |
1644 |
908 |
30 |
| VCDI |
0 |
13 |
0 |
20 |
554 |
4179 |
18172 |
17401 |
|
Date: 2025-05-28:
| 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 |
9403 |
3140 |
90 |
102 |
6 |
4 |
0 |
0 |
| OW |
1 |
1038 |
201 |
399 |
84 |
16 |
0 |
0 |
| VODI |
0 |
157 |
208 |
912 |
468 |
35 |
3 |
0 |
| ODI |
0 |
23 |
6 |
284 |
757 |
137 |
29 |
0 |
| CDI |
0 |
7 |
0 |
225 |
1689 |
2230 |
921 |
9 |
| VCDI |
0 |
5 |
0 |
93 |
2220 |
2943 |
15604 |
17782 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9402 |
2695 |
58 |
134 |
13 |
3 |
0 |
0 |
| OW |
2 |
1069 |
143 |
339 |
154 |
16 |
0 |
0 |
| VODI |
0 |
430 |
203 |
700 |
525 |
78 |
19 |
0 |
| ODI |
0 |
83 |
80 |
352 |
571 |
173 |
75 |
0 |
| CDI |
0 |
84 |
21 |
380 |
1400 |
1636 |
2048 |
550 |
| VCDI |
0 |
9 |
0 |
110 |
2561 |
3459 |
14415 |
17241 |
|
Date: 2025-05-30:
| 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 |
9826 |
2684 |
64 |
120 |
8 |
6 |
0 |
0 |
| OW |
3 |
1283 |
135 |
320 |
79 |
7 |
1 |
0 |
| VODI |
1 |
394 |
168 |
791 |
470 |
60 |
13 |
0 |
| ODI |
0 |
23 |
24 |
281 |
781 |
251 |
57 |
0 |
| CDI |
0 |
2 |
1 |
222 |
1647 |
2939 |
1481 |
13 |
| VCDI |
0 |
0 |
0 |
232 |
690 |
6383 |
15728 |
14043 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9806 |
2296 |
52 |
167 |
95 |
5 |
0 |
0 |
| OW |
24 |
1107 |
90 |
474 |
220 |
20 |
6 |
0 |
| VODI |
0 |
685 |
125 |
512 |
470 |
113 |
35 |
0 |
| ODI |
0 |
166 |
83 |
247 |
466 |
263 |
90 |
0 |
| CDI |
0 |
132 |
42 |
330 |
1463 |
2594 |
2612 |
267 |
| VCDI |
0 |
0 |
0 |
236 |
961 |
6651 |
14537 |
13789 |
|
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