Table 3 An example of a WEPS hourly wind speed probability histogram for ELLENSBURG2 NARR, WA. The table represents wind direction frequency (%) by month (12 columns) for various wind directions (16 rows).

From: Evaluating the ability of the Wind Erosion Prediction System (WEPS) to simulate near-surface wind speeds in the Inland Pacific Northwest, USA

Wind direction

January

February

March

April

May

June

July

August

September

October

November

December

N

0.8

1

1

1.8

1.7

1.6

2.1

2.7

2.6

2

0.9

0.9

NNE

1.1

1.5

1

1.4

1.3

1.5

1.5

1.9

2.2

1.6

0.8

1.2

NE

2.1

2.1

1.7

1.7

1.4

1.6

1.7

2.2

2.8

1.7

1.2

1.5

ENE

3.3

3.9

2.2

2.3

2.2

2

1.7

2.2

3.5

2.6

2.2

3.2

E

7.8

7.1

3.9

3.1

2.9

2.1

2.2

2.1

5.6

3.4

5

7.2

ESE

12.4

12.5

8.1

5.7

4.4

3.1

1.9

2.3

4.6

7

10.4

12.6

SE

11.3

12

9.8

6

4.4

2.2

1.1

2.3

3.6

9.2

12.7

11.7

SSE

6.2

6.9

6.4

5.1

2.9

2

1

1.2

2.3

5.6

7.4

7.9

S

4.3

4.3

5.2

3.4

2.3

1.5

1

1.1

1.4

3.9

4.8

4.2

SSW

3.5

3.7

4.3

3.3

2.1

1.4

1

1.2

1.9

3.1

4.3

3.6

SW

3.7

3.7

4.4

3.9

2.9

2.3

1.5

2

2

4

3.9

3.6

WSW

4.9

4.9

5.9

5.8

4.4

3.9

2.9

2.9

3.2

4.9

6

4.9

W

9.4

8.5

10

10.7

8.3

8.9

6.5

6.2

6.6

8.4

9.8

8.6

NWN

18.7

16.3

19.2

23.7

25.5

27.2

24.2

21.7

21.5

20.2

18.8

17.9

NW

8.2

9.4

14.1

18.6

29.1

34.5

43.7

41.7

29.8

18.7

9.7

8.9

NNW

1.7

1.8

2.3

3.2

3.9

3.9

5.7

5.5

6

3.4

1.8

1.6

Frequency (%) of calm winds

0.5

0.3

0.3

0.3

0.4

0.3

0.3

0.5

0.4

0.4

0.4

0.4

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