Validation of sea ice concentration - American sector
Bulletin date: 2025-05-01
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
5575 |
2757 |
36 |
46 |
0 |
0 |
0 |
0 |
| OW |
0 |
302 |
116 |
490 |
59 |
16 |
0 |
0 |
| VODI |
0 |
66 |
46 |
466 |
624 |
158 |
4 |
0 |
| ODI |
0 |
8 |
15 |
216 |
1091 |
808 |
88 |
17 |
| CDI |
0 |
0 |
0 |
66 |
584 |
1552 |
878 |
97 |
| VCDI |
0 |
0 |
0 |
33 |
273 |
1256 |
13501 |
29987 |
|
...date precedes bulletin
|
Date: 2025-04-27:
| 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 |
5763 |
2613 |
2 |
4 |
3 |
0 |
0 |
0 |
| OW |
0 |
409 |
182 |
493 |
84 |
9 |
0 |
0 |
| VODI |
0 |
135 |
65 |
460 |
703 |
205 |
20 |
0 |
| ODI |
0 |
32 |
35 |
426 |
1034 |
796 |
101 |
14 |
| CDI |
0 |
3 |
6 |
135 |
454 |
1095 |
1039 |
117 |
| VCDI |
0 |
0 |
1 |
78 |
376 |
1411 |
14159 |
28769 |
|
...date precedes bulletin
|
Date: 2025-04-29:
| 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 |
5741 |
2719 |
10 |
17 |
1 |
0 |
0 |
0 |
| OW |
0 |
551 |
204 |
240 |
45 |
0 |
0 |
0 |
| VODI |
0 |
27 |
76 |
1341 |
644 |
40 |
3 |
0 |
| ODI |
0 |
3 |
7 |
158 |
1356 |
446 |
32 |
0 |
| CDI |
0 |
1 |
1 |
86 |
303 |
1465 |
495 |
13 |
| VCDI |
0 |
0 |
0 |
3 |
225 |
1957 |
13598 |
29423 |
|
...date precedes bulletin
|
Date: 2025-05-01:
| 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 |
5618 |
2579 |
21 |
32 |
5 |
0 |
0 |
0 |
| OW |
0 |
845 |
138 |
310 |
69 |
0 |
0 |
0 |
| VODI |
0 |
51 |
116 |
1549 |
708 |
38 |
1 |
0 |
| ODI |
0 |
9 |
2 |
161 |
1244 |
555 |
56 |
0 |
| CDI |
0 |
8 |
4 |
56 |
397 |
1048 |
500 |
28 |
| VCDI |
0 |
0 |
0 |
9 |
237 |
2263 |
12886 |
29688 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5618 |
2522 |
26 |
44 |
3 |
0 |
0 |
0 |
| OW |
0 |
891 |
132 |
333 |
65 |
0 |
0 |
0 |
| VODI |
0 |
60 |
113 |
1443 |
671 |
45 |
1 |
0 |
| ODI |
0 |
11 |
6 |
230 |
1265 |
496 |
65 |
0 |
| CDI |
0 |
8 |
3 |
56 |
460 |
1094 |
639 |
21 |
| VCDI |
0 |
0 |
1 |
11 |
196 |
2269 |
12738 |
29695 |
|
Date: 2025-05-03:
| 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 |
5747 |
2233 |
19 |
37 |
3 |
0 |
0 |
0 |
| OW |
0 |
1132 |
157 |
383 |
60 |
0 |
0 |
0 |
| VODI |
0 |
100 |
167 |
1365 |
800 |
44 |
1 |
5 |
| ODI |
0 |
6 |
1 |
148 |
1181 |
508 |
38 |
25 |
| CDI |
0 |
5 |
2 |
48 |
395 |
929 |
606 |
252 |
| VCDI |
0 |
0 |
0 |
16 |
219 |
1835 |
12949 |
29815 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5747 |
2194 |
17 |
45 |
6 |
0 |
0 |
0 |
| OW |
0 |
1151 |
150 |
429 |
64 |
0 |
0 |
0 |
| VODI |
0 |
114 |
162 |
1213 |
752 |
61 |
1 |
7 |
| ODI |
0 |
12 |
15 |
240 |
1212 |
489 |
45 |
28 |
| CDI |
0 |
5 |
2 |
58 |
439 |
919 |
777 |
290 |
| VCDI |
0 |
0 |
0 |
12 |
185 |
1847 |
12771 |
29772 |
|
Date: 2025-05-05:
| 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 |
5696 |
2593 |
22 |
48 |
1 |
0 |
0 |
0 |
| OW |
0 |
1178 |
304 |
279 |
14 |
0 |
0 |
0 |
| VODI |
0 |
3 |
19 |
1486 |
416 |
13 |
7 |
4 |
| ODI |
0 |
0 |
0 |
92 |
1478 |
181 |
50 |
17 |
| CDI |
0 |
0 |
0 |
13 |
434 |
1587 |
340 |
57 |
| VCDI |
0 |
0 |
0 |
0 |
128 |
1584 |
12635 |
30552 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5696 |
2160 |
27 |
45 |
3 |
0 |
0 |
0 |
| OW |
0 |
1365 |
143 |
525 |
85 |
0 |
1 |
0 |
| VODI |
0 |
208 |
153 |
960 |
879 |
92 |
11 |
10 |
| ODI |
0 |
41 |
22 |
302 |
912 |
451 |
88 |
26 |
| CDI |
0 |
0 |
0 |
82 |
434 |
1170 |
1283 |
157 |
| VCDI |
0 |
0 |
0 |
4 |
158 |
1652 |
11649 |
30437 |
|
Date: 2025-05-07:
| 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 |
5816 |
2649 |
27 |
60 |
0 |
0 |
0 |
0 |
| OW |
0 |
1286 |
210 |
259 |
26 |
4 |
0 |
0 |
| VODI |
0 |
52 |
91 |
1455 |
518 |
31 |
2 |
9 |
| ODI |
0 |
1 |
1 |
141 |
1175 |
295 |
24 |
12 |
| CDI |
0 |
0 |
0 |
44 |
562 |
1197 |
261 |
99 |
| VCDI |
0 |
0 |
0 |
0 |
227 |
1507 |
10958 |
32232 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5811 |
2120 |
21 |
60 |
4 |
0 |
0 |
0 |
| OW |
5 |
1580 |
169 |
519 |
85 |
4 |
0 |
0 |
| VODI |
0 |
242 |
108 |
1005 |
877 |
149 |
5 |
13 |
| ODI |
0 |
39 |
29 |
271 |
830 |
384 |
55 |
40 |
| CDI |
0 |
7 |
2 |
95 |
544 |
1265 |
1113 |
513 |
| VCDI |
0 |
0 |
0 |
9 |
168 |
1232 |
10072 |
31786 |
|
Date: 2025-05-09:
| 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 |
6227 |
2468 |
15 |
33 |
3 |
3 |
0 |
0 |
| OW |
0 |
1388 |
172 |
191 |
36 |
15 |
0 |
0 |
| VODI |
0 |
220 |
184 |
1314 |
626 |
43 |
7 |
6 |
| ODI |
0 |
17 |
9 |
162 |
1151 |
273 |
30 |
13 |
| CDI |
0 |
6 |
13 |
107 |
707 |
1172 |
238 |
71 |
| VCDI |
0 |
1 |
0 |
79 |
852 |
2551 |
10220 |
30608 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
6212 |
2054 |
21 |
51 |
3 |
3 |
0 |
0 |
| OW |
15 |
1620 |
175 |
466 |
82 |
21 |
1 |
0 |
| VODI |
0 |
316 |
112 |
964 |
941 |
89 |
11 |
12 |
| ODI |
0 |
106 |
67 |
223 |
853 |
351 |
46 |
44 |
| CDI |
0 |
3 |
18 |
121 |
712 |
1391 |
1076 |
427 |
| VCDI |
0 |
1 |
0 |
61 |
784 |
2202 |
9361 |
30215 |
|
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