Validation of sea ice concentration - American sector
Bulletin date: 2025-07-31
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-07-25:
| 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 |
10607 |
3634 |
85 |
37 |
1 |
0 |
0 |
0 |
| OW |
14 |
860 |
346 |
524 |
39 |
1 |
0 |
0 |
| VODI |
0 |
109 |
89 |
1576 |
1078 |
25 |
0 |
0 |
| ODI |
0 |
19 |
5 |
129 |
4210 |
1493 |
0 |
0 |
| CDI |
0 |
62 |
33 |
61 |
4600 |
11813 |
50 |
0 |
| VCDI |
0 |
6 |
18 |
96 |
977 |
3088 |
181 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-27:
| 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 |
11075 |
3445 |
61 |
44 |
2 |
0 |
0 |
0 |
| OW |
11 |
1027 |
336 |
469 |
52 |
1 |
0 |
0 |
| VODI |
1 |
171 |
147 |
1857 |
735 |
39 |
0 |
0 |
| ODI |
0 |
30 |
8 |
456 |
3917 |
899 |
0 |
0 |
| CDI |
0 |
87 |
38 |
85 |
4789 |
9959 |
759 |
0 |
| VCDI |
0 |
27 |
13 |
100 |
654 |
4008 |
564 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-29:
| 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 |
10840 |
4273 |
106 |
31 |
0 |
0 |
0 |
0 |
| OW |
22 |
916 |
446 |
561 |
13 |
0 |
0 |
0 |
| VODI |
5 |
63 |
75 |
2309 |
721 |
1 |
0 |
0 |
| ODI |
0 |
44 |
18 |
433 |
5882 |
219 |
1 |
0 |
| CDI |
0 |
41 |
30 |
86 |
3182 |
11981 |
498 |
0 |
| VCDI |
0 |
2 |
1 |
10 |
119 |
2202 |
735 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-31:
| 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 |
11197 |
3779 |
74 |
19 |
0 |
0 |
0 |
0 |
| OW |
21 |
1139 |
417 |
463 |
25 |
0 |
0 |
0 |
| VODI |
4 |
129 |
217 |
2186 |
1381 |
5 |
0 |
0 |
| ODI |
0 |
51 |
10 |
258 |
5247 |
646 |
0 |
0 |
| CDI |
0 |
41 |
33 |
100 |
3290 |
11048 |
921 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
172 |
2419 |
571 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11197 |
3894 |
64 |
23 |
0 |
0 |
0 |
0 |
| OW |
21 |
1019 |
424 |
500 |
35 |
0 |
0 |
0 |
| VODI |
4 |
133 |
221 |
2153 |
1330 |
5 |
0 |
0 |
| ODI |
0 |
50 |
6 |
241 |
5212 |
691 |
7 |
0 |
| CDI |
0 |
43 |
36 |
109 |
3378 |
10937 |
917 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
160 |
2485 |
568 |
0 |
|
Date: 2025-08-02:
| 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 |
11228 |
3812 |
63 |
24 |
0 |
0 |
0 |
0 |
| OW |
34 |
1313 |
486 |
463 |
16 |
0 |
0 |
0 |
| VODI |
3 |
202 |
331 |
2784 |
1121 |
62 |
0 |
0 |
| ODI |
0 |
67 |
21 |
876 |
2459 |
2298 |
370 |
0 |
| CDI |
0 |
85 |
36 |
120 |
2086 |
7694 |
4244 |
125 |
| VCDI |
0 |
1 |
0 |
0 |
156 |
766 |
2520 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11229 |
3958 |
61 |
37 |
0 |
0 |
0 |
0 |
| OW |
32 |
1166 |
500 |
488 |
18 |
0 |
0 |
0 |
| VODI |
4 |
196 |
318 |
2546 |
1212 |
91 |
1 |
0 |
| ODI |
0 |
69 |
17 |
1071 |
2350 |
2028 |
588 |
0 |
| CDI |
0 |
90 |
41 |
125 |
2114 |
7825 |
3952 |
124 |
| VCDI |
0 |
1 |
0 |
0 |
144 |
876 |
2593 |
1 |
|
Date: 2025-08-04:
| 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 |
11205 |
4316 |
88 |
45 |
5 |
0 |
0 |
0 |
| OW |
36 |
1237 |
730 |
536 |
14 |
0 |
0 |
0 |
| VODI |
0 |
64 |
94 |
4094 |
706 |
0 |
0 |
0 |
| ODI |
0 |
10 |
8 |
269 |
4050 |
127 |
0 |
0 |
| CDI |
0 |
7 |
10 |
41 |
1258 |
9325 |
311 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
11 |
944 |
5819 |
506 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11190 |
3936 |
95 |
67 |
5 |
0 |
0 |
0 |
| OW |
41 |
1192 |
462 |
654 |
15 |
0 |
0 |
0 |
| VODI |
10 |
320 |
310 |
3316 |
1028 |
45 |
0 |
0 |
| ODI |
0 |
90 |
31 |
767 |
2215 |
2515 |
204 |
0 |
| CDI |
0 |
90 |
23 |
159 |
2700 |
7540 |
3408 |
367 |
| VCDI |
0 |
6 |
9 |
22 |
81 |
296 |
2518 |
139 |
|
Date: 2025-08-06:
| 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 |
11092 |
4413 |
122 |
98 |
16 |
0 |
0 |
0 |
| OW |
24 |
1234 |
593 |
586 |
48 |
0 |
0 |
0 |
| VODI |
0 |
117 |
167 |
3571 |
1176 |
23 |
0 |
0 |
| ODI |
0 |
10 |
8 |
337 |
3373 |
583 |
68 |
0 |
| CDI |
0 |
6 |
6 |
39 |
1684 |
7465 |
2924 |
0 |
| VCDI |
0 |
0 |
1 |
4 |
8 |
921 |
4746 |
403 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11072 |
4084 |
151 |
132 |
18 |
0 |
0 |
0 |
| OW |
42 |
1155 |
427 |
653 |
43 |
0 |
0 |
0 |
| VODI |
2 |
353 |
252 |
3111 |
1366 |
155 |
48 |
0 |
| ODI |
0 |
109 |
36 |
554 |
2160 |
2372 |
526 |
0 |
| CDI |
0 |
76 |
27 |
163 |
2673 |
6289 |
5440 |
209 |
| VCDI |
0 |
3 |
4 |
22 |
45 |
176 |
1724 |
194 |
|
Date: 2025-08-08:
| 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 |
11402 |
4184 |
116 |
66 |
6 |
0 |
0 |
0 |
| OW |
24 |
1418 |
468 |
484 |
64 |
1 |
0 |
0 |
| VODI |
0 |
311 |
508 |
3200 |
1066 |
215 |
0 |
0 |
| ODI |
0 |
13 |
13 |
576 |
3582 |
658 |
114 |
0 |
| CDI |
0 |
4 |
10 |
38 |
1291 |
7794 |
3157 |
0 |
| VCDI |
0 |
1 |
4 |
4 |
14 |
131 |
3329 |
1600 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11394 |
3748 |
104 |
64 |
3 |
0 |
0 |
0 |
| OW |
30 |
1337 |
412 |
616 |
69 |
2 |
0 |
0 |
| VODI |
2 |
620 |
532 |
2766 |
1443 |
178 |
0 |
0 |
| ODI |
0 |
120 |
28 |
678 |
1857 |
2377 |
789 |
0 |
| CDI |
0 |
104 |
36 |
226 |
2626 |
6160 |
4908 |
1033 |
| VCDI |
0 |
2 |
7 |
18 |
25 |
82 |
903 |
567 |
|
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