Validation of sea ice concentration - American sector
Bulletin date: 2025-07-24
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-07-18:
| 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 |
24305 |
2892 |
36 |
46 |
3 |
0 |
0 |
0 |
| OW |
349 |
627 |
193 |
648 |
48 |
1 |
0 |
0 |
| VODI |
1 |
51 |
26 |
1177 |
1223 |
9 |
0 |
0 |
| ODI |
0 |
18 |
4 |
109 |
3930 |
1127 |
0 |
0 |
| CDI |
0 |
24 |
0 |
49 |
3964 |
14110 |
2393 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
660 |
1531 |
1674 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-20:
| 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 |
24661 |
2997 |
58 |
33 |
0 |
0 |
0 |
0 |
| OW |
250 |
652 |
239 |
739 |
33 |
0 |
0 |
0 |
| VODI |
1 |
59 |
23 |
1304 |
1518 |
16 |
0 |
0 |
| ODI |
0 |
36 |
3 |
75 |
3442 |
483 |
0 |
0 |
| CDI |
0 |
18 |
3 |
93 |
3226 |
16252 |
1526 |
0 |
| VCDI |
0 |
0 |
0 |
96 |
565 |
1435 |
1395 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-22:
| 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 |
25042 |
3496 |
116 |
83 |
1 |
0 |
0 |
0 |
| OW |
38 |
562 |
264 |
916 |
28 |
1 |
0 |
0 |
| VODI |
0 |
59 |
24 |
1433 |
1018 |
10 |
0 |
0 |
| ODI |
0 |
18 |
7 |
64 |
5937 |
842 |
0 |
0 |
| CDI |
0 |
11 |
9 |
186 |
2175 |
13664 |
1199 |
0 |
| VCDI |
0 |
0 |
0 |
67 |
350 |
2917 |
694 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-24:
| 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 |
25232 |
3551 |
128 |
70 |
0 |
0 |
0 |
0 |
| OW |
33 |
659 |
326 |
786 |
20 |
8 |
0 |
0 |
| VODI |
0 |
68 |
27 |
2078 |
700 |
32 |
0 |
0 |
| ODI |
0 |
25 |
4 |
69 |
5429 |
795 |
0 |
0 |
| CDI |
0 |
25 |
22 |
165 |
3403 |
11928 |
706 |
0 |
| VCDI |
0 |
0 |
0 |
154 |
480 |
2896 |
1412 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
25228 |
3584 |
162 |
108 |
0 |
0 |
0 |
0 |
| OW |
37 |
625 |
290 |
703 |
18 |
9 |
0 |
0 |
| VODI |
0 |
67 |
29 |
2039 |
624 |
36 |
0 |
0 |
| ODI |
0 |
27 |
4 |
155 |
5591 |
997 |
0 |
0 |
| CDI |
0 |
25 |
22 |
180 |
3371 |
11435 |
661 |
0 |
| VCDI |
0 |
0 |
0 |
137 |
428 |
3182 |
1457 |
0 |
|
Date: 2025-07-26:
| 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 |
25531 |
3500 |
101 |
76 |
3 |
0 |
0 |
0 |
| OW |
12 |
800 |
291 |
812 |
29 |
0 |
0 |
0 |
| VODI |
0 |
109 |
33 |
2030 |
841 |
8 |
0 |
0 |
| ODI |
0 |
24 |
2 |
90 |
4680 |
779 |
0 |
0 |
| CDI |
0 |
40 |
27 |
171 |
4434 |
10233 |
1841 |
48 |
| VCDI |
0 |
0 |
0 |
134 |
651 |
3061 |
831 |
9 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
25530 |
3515 |
134 |
131 |
1 |
0 |
0 |
0 |
| OW |
13 |
788 |
244 |
669 |
39 |
1 |
0 |
0 |
| VODI |
0 |
101 |
47 |
2015 |
747 |
10 |
0 |
0 |
| ODI |
0 |
28 |
3 |
187 |
4921 |
1119 |
0 |
0 |
| CDI |
0 |
41 |
26 |
194 |
4288 |
8891 |
1884 |
37 |
| VCDI |
0 |
0 |
0 |
117 |
642 |
4060 |
788 |
20 |
|
Date: 2025-07-28:
| 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 |
25698 |
4027 |
185 |
105 |
1 |
0 |
0 |
0 |
| OW |
6 |
667 |
249 |
1025 |
13 |
4 |
0 |
0 |
| VODI |
0 |
46 |
16 |
2168 |
705 |
4 |
0 |
0 |
| ODI |
0 |
18 |
25 |
117 |
6900 |
112 |
0 |
0 |
| CDI |
0 |
3 |
7 |
196 |
1866 |
13330 |
697 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
168 |
617 |
2006 |
247 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
25688 |
3656 |
132 |
134 |
1 |
0 |
0 |
0 |
| OW |
16 |
881 |
251 |
693 |
39 |
18 |
0 |
0 |
| VODI |
0 |
103 |
56 |
2207 |
738 |
50 |
0 |
0 |
| ODI |
0 |
33 |
0 |
233 |
4094 |
1292 |
0 |
0 |
| CDI |
0 |
73 |
31 |
128 |
4014 |
7261 |
1440 |
234 |
| VCDI |
0 |
15 |
12 |
219 |
767 |
5446 |
1263 |
13 |
|
Date: 2025-07-30:
| 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 |
25956 |
3777 |
113 |
70 |
1 |
0 |
0 |
0 |
| OW |
14 |
867 |
317 |
908 |
12 |
0 |
0 |
0 |
| VODI |
2 |
104 |
37 |
2510 |
1104 |
0 |
0 |
0 |
| ODI |
0 |
28 |
13 |
105 |
5326 |
931 |
0 |
0 |
| CDI |
0 |
11 |
23 |
204 |
2687 |
12546 |
20 |
0 |
| VCDI |
0 |
0 |
0 |
17 |
159 |
3029 |
340 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
25948 |
3441 |
95 |
113 |
0 |
0 |
0 |
0 |
| OW |
21 |
990 |
244 |
685 |
37 |
0 |
0 |
0 |
| VODI |
1 |
181 |
108 |
2361 |
791 |
21 |
0 |
0 |
| ODI |
2 |
45 |
1 |
355 |
3676 |
1860 |
0 |
0 |
| CDI |
0 |
93 |
23 |
88 |
3664 |
8124 |
24 |
0 |
| VCDI |
0 |
37 |
32 |
212 |
1121 |
6501 |
336 |
0 |
|
Date: 2025-08-01:
| 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 |
26243 |
3518 |
67 |
15 |
0 |
0 |
0 |
0 |
| OW |
87 |
1058 |
365 |
768 |
2 |
0 |
0 |
0 |
| VODI |
2 |
159 |
122 |
3185 |
877 |
5 |
0 |
0 |
| ODI |
0 |
48 |
15 |
462 |
4236 |
1455 |
45 |
0 |
| CDI |
0 |
28 |
13 |
263 |
3069 |
8700 |
2629 |
90 |
| VCDI |
0 |
0 |
0 |
1 |
120 |
1066 |
1866 |
652 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
26239 |
3124 |
77 |
88 |
0 |
0 |
0 |
0 |
| OW |
90 |
1144 |
237 |
578 |
7 |
0 |
0 |
0 |
| VODI |
3 |
326 |
221 |
2578 |
454 |
70 |
0 |
0 |
| ODI |
0 |
43 |
9 |
1052 |
2772 |
1673 |
337 |
0 |
| CDI |
0 |
159 |
25 |
247 |
4476 |
5804 |
3265 |
543 |
| VCDI |
0 |
15 |
13 |
151 |
595 |
3679 |
938 |
199 |
|
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