Validation of sea ice concentration - American sector
Bulletin date: 2025-05-15
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
0 |
0 |
0 |
0 |
1 |
1 |
0 |
0 |
| OW |
0 |
34 |
7 |
6 |
6 |
9 |
0 |
0 |
| VODI |
0 |
95 |
49 |
103 |
42 |
17 |
10 |
0 |
| ODI |
0 |
57 |
41 |
156 |
220 |
84 |
61 |
0 |
| CDI |
0 |
55 |
40 |
143 |
430 |
758 |
421 |
0 |
| VCDI |
0 |
10 |
5 |
108 |
1156 |
2495 |
18550 |
20696 |
|
...date precedes bulletin
|
Date: 2025-05-11:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
65 |
16 |
22 |
0 |
0 |
0 |
0 |
| VODI |
0 |
138 |
52 |
147 |
49 |
9 |
6 |
0 |
| ODI |
0 |
62 |
37 |
182 |
166 |
102 |
54 |
0 |
| CDI |
0 |
53 |
32 |
139 |
436 |
641 |
627 |
1 |
| VCDI |
0 |
10 |
14 |
48 |
276 |
3249 |
22613 |
16620 |
|
...date precedes bulletin
|
Date: 2025-05-13:
| 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 |
0 |
19 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
185 |
24 |
8 |
3 |
4 |
5 |
0 |
| VODI |
0 |
126 |
51 |
114 |
147 |
30 |
29 |
0 |
| ODI |
0 |
61 |
21 |
243 |
323 |
132 |
51 |
0 |
| CDI |
0 |
222 |
9 |
362 |
670 |
721 |
394 |
1 |
| VCDI |
0 |
430 |
27 |
155 |
340 |
4830 |
23563 |
12566 |
|
...date precedes bulletin
|
Date: 2025-05-15:
| 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 |
0 |
74 |
5 |
1 |
0 |
0 |
0 |
0 |
| OW |
0 |
218 |
32 |
23 |
4 |
0 |
0 |
0 |
| VODI |
0 |
117 |
58 |
157 |
139 |
20 |
16 |
0 |
| ODI |
0 |
39 |
36 |
194 |
343 |
177 |
69 |
0 |
| CDI |
0 |
8 |
11 |
94 |
517 |
1129 |
1028 |
3 |
| VCDI |
0 |
2 |
2 |
24 |
94 |
3303 |
25328 |
12601 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
97 |
5 |
3 |
0 |
0 |
0 |
0 |
| OW |
0 |
190 |
30 |
17 |
2 |
0 |
0 |
0 |
| VODI |
0 |
117 |
59 |
151 |
147 |
31 |
15 |
0 |
| ODI |
0 |
48 |
31 |
194 |
323 |
171 |
80 |
0 |
| CDI |
0 |
4 |
17 |
102 |
457 |
1039 |
982 |
2 |
| VCDI |
0 |
2 |
2 |
26 |
168 |
3388 |
25364 |
12602 |
|
Date: 2025-05-17:
| 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 |
0 |
109 |
6 |
7 |
0 |
0 |
0 |
0 |
| OW |
0 |
203 |
31 |
66 |
11 |
0 |
0 |
0 |
| VODI |
0 |
125 |
59 |
143 |
160 |
34 |
13 |
0 |
| ODI |
0 |
41 |
41 |
225 |
360 |
134 |
99 |
0 |
| CDI |
0 |
38 |
23 |
125 |
504 |
895 |
977 |
1 |
| VCDI |
0 |
37 |
19 |
129 |
341 |
3011 |
25002 |
12897 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
117 |
8 |
13 |
0 |
0 |
0 |
0 |
| OW |
0 |
186 |
27 |
51 |
13 |
0 |
0 |
0 |
| VODI |
0 |
139 |
55 |
144 |
160 |
36 |
15 |
0 |
| ODI |
0 |
41 |
48 |
220 |
346 |
135 |
109 |
0 |
| CDI |
0 |
32 |
20 |
132 |
470 |
771 |
959 |
23 |
| VCDI |
0 |
38 |
21 |
135 |
387 |
3132 |
25008 |
12875 |
|
Date: 2025-05-19:
| 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 |
0 |
144 |
20 |
21 |
0 |
0 |
0 |
0 |
| OW |
0 |
277 |
31 |
17 |
8 |
3 |
0 |
0 |
| VODI |
0 |
163 |
119 |
280 |
101 |
21 |
2 |
0 |
| ODI |
0 |
15 |
35 |
229 |
445 |
189 |
41 |
0 |
| CDI |
0 |
2 |
6 |
95 |
362 |
1282 |
610 |
11 |
| VCDI |
0 |
1 |
4 |
41 |
159 |
2445 |
24338 |
14349 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
155 |
24 |
26 |
3 |
1 |
0 |
0 |
| OW |
0 |
197 |
33 |
32 |
18 |
2 |
0 |
0 |
| VODI |
0 |
149 |
66 |
174 |
150 |
63 |
20 |
0 |
| ODI |
0 |
62 |
56 |
214 |
286 |
208 |
105 |
4 |
| CDI |
0 |
37 |
32 |
171 |
342 |
816 |
1149 |
517 |
| VCDI |
0 |
2 |
4 |
66 |
276 |
2850 |
23717 |
13839 |
|
Date: 2025-05-21:
| 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 |
0 |
195 |
21 |
5 |
0 |
0 |
0 |
0 |
| OW |
0 |
295 |
38 |
42 |
13 |
7 |
0 |
0 |
| VODI |
0 |
217 |
137 |
205 |
101 |
66 |
8 |
0 |
| ODI |
0 |
31 |
51 |
280 |
335 |
145 |
53 |
0 |
| CDI |
0 |
21 |
31 |
188 |
499 |
1355 |
810 |
8 |
| VCDI |
0 |
8 |
7 |
64 |
222 |
2406 |
23019 |
14983 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
157 |
17 |
12 |
3 |
1 |
0 |
0 |
| OW |
0 |
181 |
26 |
34 |
16 |
11 |
1 |
0 |
| VODI |
0 |
274 |
76 |
143 |
110 |
87 |
20 |
0 |
| ODI |
0 |
104 |
88 |
224 |
285 |
222 |
96 |
0 |
| CDI |
0 |
41 |
68 |
269 |
395 |
1106 |
1402 |
736 |
| VCDI |
0 |
10 |
10 |
102 |
361 |
2552 |
22371 |
14255 |
|
Date: 2025-05-23:
| 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 |
0 |
299 |
11 |
11 |
2 |
0 |
0 |
0 |
| OW |
0 |
321 |
37 |
54 |
24 |
8 |
0 |
0 |
| VODI |
0 |
266 |
142 |
239 |
160 |
63 |
17 |
0 |
| ODI |
0 |
59 |
57 |
286 |
283 |
199 |
80 |
0 |
| CDI |
0 |
29 |
49 |
243 |
438 |
1381 |
848 |
24 |
| VCDI |
0 |
8 |
8 |
62 |
209 |
2696 |
24411 |
12842 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
146 |
12 |
16 |
3 |
3 |
2 |
0 |
| OW |
0 |
178 |
8 |
30 |
22 |
21 |
17 |
0 |
| VODI |
0 |
356 |
75 |
135 |
119 |
117 |
57 |
0 |
| ODI |
0 |
215 |
101 |
244 |
264 |
284 |
152 |
39 |
| CDI |
0 |
77 |
98 |
341 |
406 |
1613 |
1807 |
558 |
| VCDI |
0 |
10 |
10 |
129 |
302 |
2309 |
23321 |
12269 |
|
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