Jan 18-19, 2012 Puget Sound snow and freezing rain

The Problems

Cold air scoured out too quickly, freezing rain predicted to end too quickly...

Working on Solutions


1) Attempt to add 10 vertical levels in lowest 200m.
2) Attempt to add 10 vertical levels in lowest 1000m.
The loops in this table illustrate the attempts and how they impact the simulations.

Assessment:

The extra vertical levels make only a slight difference and do not solve the problem.

Table 1. Standard Plots
InitializationDomainProductHourCases (control click to select multiple)
00Z Jan 7, 2010 is a really bad case for standard runs
Obs: 21Z Jan 19, 2012
Obs: 0Z Jan 20, 2012
All sfc_wa Obs for the period
All sfc_pgtsnd Obs for the period

Vertical Levels

Number1. Std2. wrfv331v48 3. wrfv331v48t1km
ETA Mass LevelPressure LevelHeight (m)ETA Mass LevelPressure LevelHeight (m)ETA Mass LevelPressure LevelHeight (m)
47 118.1715309.2 118.17 15309.24707
46 154.5313717.3 154.53 13717.35840
45 190.8912439.2 190.89 12439.24805
44 227.2411345.0 227.24 11345.09570
43 263.6010377.9 263.60 10377.96191
42 299.97 9506.4 299.97 9506.43750
41 336.33 8710.5 336.33 8710.59082
40 372.71 7976.9 372.71 7976.92822
39 409.09 7295.9 409.09 7295.93604
38 445.49 6660.1 445.49 6660.18506
37 118.1715309.2 481.91 6064.3 481.91 6064.31592
36 154.5313717.3 518.35 5504.1 518.35 5504.12500
35 190.8912439.2 554.81 4975.6 554.81 4975.64551
34 227.2411345.0 591.29 4474.9 591.29 4474.93066
33 263.6010377.9 627.78 3998.4 627.78 3998.43604
32 299.97 9506.4 664.31 3543.4 664.31 3543.50806
31 336.33 8710.5 700.87 3108.0 700.87 3108.02808
30 372.71 7976.9 732.89 2741.8 732.89 2741.89868
29 409.09 7295.9 760.36 2437.7 760.36 2437.79639
28 445.49 6660.1 787.84 2142.3 787.84 2142.35522
27 481.91 6064.3 815.35 1855.0 815.35 1855.08850
26 518.35 5504.1 842.88 1575.5 842.88 1575.57434
25 554.81 4975.6 870.43 1303.4 870.43 1303.45227
24 591.29 4474.9 893.40 1082.2 888.81 1126.25244
23 627.78 3998.4 911.78 908.5 898.00 1038.64832
22 664.31 3543.4 925.57 780.2 907.19 951.78741
21 700.87 3108.0 934.77 695.4 916.38 865.65344
20 732.89 2741.8 943.96 611.4 923.27 801.54755
19 760.36 2437.7 953.16 527.9 927.87 759.01093
18 787.84 2142.3 962.36 445.1 932.47 716.64276
17 815.35 1855.0 971.56 362.9 937.06 674.44012
16 842.88 1575.5 980.76 281.2 941.66 632.40106
15 870.43 1303.4 986.29 232.6 946.26 590.52460
14 893.40 1082.2 988.13 216.4 951.32 544.64105
13 911.78 908.5 989.97 200.2 956.84 494.80316
12 925.57 780.2 991.82 184.1 962.36 445.18280
11 934.77 695.4 993.66 167.9 967.88 395.77606
10 943.96 611.4 995.50 151.8 973.40 346.58173
9 953.16 527.9 997.35 135.7 978.92 297.59644
8 962.36 445.1 999.19 119.7 984.45 248.81586
7 971.56 362.9 1001.03 103.6 989.97 200.23672
6 980.76 281.2 1002.88 87.6 994.58 159.91541
5 989.97 200.2 1004.72 71.6 998.27 127.75159
4 996.88 139.7 1006.56 55.7 1001.95 95.67555
3 1001.49 99.6 1008.41 39.7 1005.64 63.69125
2 1006.10 59.6 1010.25 23.8 1009.33 31.79721
1 1010.71 19.8 1012.10 7.9 1012.10 7.94068