Validation of sea ice concentration - American sector
Bulletin date: 2025-05-08
Data source: OSI SAF N.H. multi-product 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 |
5657 |
2410 |
21 |
30 |
7 |
0 |
0 |
0 |
| OW |
0 |
1014 |
146 |
316 |
78 |
0 |
0 |
0 |
| VODI |
0 |
75 |
144 |
1476 |
785 |
40 |
7 |
0 |
| ODI |
0 |
8 |
2 |
172 |
1256 |
498 |
62 |
1 |
| CDI |
0 |
6 |
0 |
55 |
363 |
887 |
491 |
84 |
| VCDI |
0 |
0 |
0 |
12 |
246 |
2044 |
14195 |
28643 |
|
...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 |
5798 |
2098 |
17 |
37 |
3 |
0 |
0 |
0 |
| OW |
0 |
1265 |
177 |
415 |
48 |
0 |
0 |
0 |
| VODI |
0 |
155 |
160 |
1237 |
863 |
93 |
11 |
0 |
| ODI |
0 |
0 |
0 |
141 |
1042 |
519 |
61 |
5 |
| CDI |
0 |
0 |
0 |
51 |
424 |
1118 |
855 |
114 |
| VCDI |
0 |
0 |
0 |
2 |
190 |
1709 |
12725 |
29898 |
|
...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 |
5697 |
2654 |
25 |
67 |
2 |
0 |
0 |
0 |
| OW |
0 |
1252 |
213 |
285 |
22 |
0 |
0 |
0 |
| VODI |
0 |
36 |
77 |
1400 |
535 |
15 |
4 |
6 |
| ODI |
0 |
1 |
2 |
123 |
1264 |
259 |
19 |
15 |
| CDI |
0 |
0 |
0 |
23 |
463 |
1469 |
264 |
135 |
| VCDI |
0 |
0 |
0 |
0 |
105 |
1460 |
11445 |
31894 |
|
...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 |
5996 |
2591 |
28 |
31 |
0 |
1 |
0 |
0 |
| OW |
0 |
1315 |
169 |
246 |
31 |
12 |
0 |
0 |
| VODI |
0 |
150 |
161 |
1339 |
566 |
33 |
3 |
7 |
| ODI |
0 |
12 |
3 |
157 |
1180 |
260 |
46 |
13 |
| CDI |
0 |
3 |
4 |
54 |
685 |
1086 |
338 |
33 |
| VCDI |
0 |
0 |
0 |
2 |
339 |
2405 |
14252 |
27680 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5996 |
2542 |
28 |
30 |
1 |
0 |
0 |
0 |
| OW |
0 |
1342 |
163 |
235 |
33 |
9 |
0 |
0 |
| VODI |
0 |
170 |
160 |
1333 |
578 |
41 |
6 |
6 |
| ODI |
0 |
14 |
10 |
167 |
1201 |
292 |
43 |
16 |
| CDI |
0 |
3 |
4 |
60 |
651 |
1075 |
413 |
44 |
| VCDI |
0 |
0 |
0 |
4 |
337 |
2380 |
14177 |
27667 |
|
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 |
6477 |
2307 |
30 |
25 |
0 |
0 |
0 |
0 |
| OW |
0 |
1541 |
165 |
190 |
39 |
6 |
8 |
0 |
| VODI |
0 |
272 |
193 |
1334 |
667 |
36 |
12 |
7 |
| ODI |
0 |
8 |
18 |
184 |
867 |
268 |
42 |
17 |
| CDI |
0 |
2 |
8 |
126 |
693 |
850 |
342 |
119 |
| VCDI |
0 |
0 |
0 |
29 |
299 |
2126 |
13699 |
28225 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
6477 |
2214 |
22 |
33 |
0 |
0 |
0 |
0 |
| OW |
0 |
1607 |
163 |
185 |
43 |
6 |
7 |
0 |
| VODI |
0 |
292 |
200 |
1328 |
619 |
30 |
14 |
7 |
| ODI |
0 |
15 |
23 |
186 |
924 |
300 |
39 |
24 |
| CDI |
0 |
2 |
6 |
126 |
687 |
918 |
407 |
149 |
| VCDI |
0 |
0 |
0 |
30 |
292 |
2032 |
13636 |
28188 |
|
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 |
6832 |
2844 |
25 |
33 |
0 |
0 |
0 |
0 |
| OW |
0 |
1383 |
229 |
344 |
25 |
0 |
0 |
0 |
| VODI |
0 |
44 |
47 |
1460 |
386 |
21 |
0 |
0 |
| ODI |
0 |
0 |
4 |
133 |
1170 |
142 |
16 |
8 |
| CDI |
0 |
0 |
0 |
46 |
847 |
1579 |
228 |
65 |
| VCDI |
0 |
0 |
0 |
0 |
93 |
1945 |
15598 |
25684 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
6826 |
2228 |
17 |
41 |
1 |
0 |
0 |
0 |
| OW |
6 |
1496 |
108 |
328 |
54 |
2 |
0 |
0 |
| VODI |
0 |
472 |
144 |
1252 |
530 |
45 |
1 |
10 |
| ODI |
0 |
56 |
11 |
210 |
753 |
187 |
50 |
20 |
| CDI |
0 |
19 |
25 |
158 |
856 |
1019 |
786 |
266 |
| VCDI |
0 |
0 |
0 |
27 |
327 |
2434 |
15005 |
25461 |
|
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 |
7341 |
2666 |
52 |
53 |
0 |
0 |
0 |
0 |
| OW |
1 |
1659 |
189 |
246 |
57 |
0 |
2 |
0 |
| VODI |
0 |
246 |
187 |
829 |
481 |
43 |
30 |
0 |
| ODI |
0 |
1 |
5 |
126 |
857 |
241 |
69 |
0 |
| CDI |
0 |
0 |
0 |
47 |
874 |
1527 |
656 |
22 |
| VCDI |
0 |
0 |
0 |
0 |
105 |
6923 |
28091 |
7605 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7231 |
2045 |
12 |
38 |
3 |
0 |
0 |
0 |
| OW |
111 |
1686 |
210 |
259 |
43 |
1 |
3 |
0 |
| VODI |
0 |
737 |
169 |
770 |
590 |
76 |
19 |
0 |
| ODI |
0 |
78 |
20 |
92 |
660 |
220 |
95 |
1 |
| CDI |
0 |
26 |
22 |
133 |
856 |
1588 |
1184 |
73 |
| VCDI |
0 |
0 |
0 |
9 |
222 |
6849 |
27547 |
7553 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7380 |
2163 |
31 |
30 |
8 |
3 |
0 |
0 |
| OW |
96 |
2002 |
212 |
346 |
29 |
14 |
1 |
0 |
| VODI |
0 |
543 |
131 |
530 |
539 |
83 |
31 |
0 |
| ODI |
0 |
118 |
18 |
243 |
567 |
281 |
105 |
0 |
| CDI |
0 |
127 |
41 |
299 |
1077 |
1390 |
1246 |
33 |
| VCDI |
0 |
24 |
1 |
65 |
500 |
2340 |
17325 |
21259 |
|
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