Hanford 400-ft Tower Hourly Observations
Wind Speed Units: mph
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400 Foot Tower Information Fri Oct 23 0:04 PST 2026
Tower Current Temperature Wind Speed
Level Max Avg Min Dir Max Avg Min
-------- ------ ------ ------ ------ ----- ------ ------
400 foot 52.2 51.5 51.2 322.8 38.4 21.7 21.7
300 foot 51.3 50.9 50.6
250 foot 51.8 51.4 51.0
200 foot 52.2 51.7 51.2 278.3 31.1 11.7 11.7
100 foot 53.3 51.9 51.1
50 foot 52.9 52.0 51.2 228.7 23.5 4.7 4.7
30 foot 52.1 51.6 51.2 222.2 22.7 4.2 4.2
3 foot 47.5 46.5 45.5
0.5" Soil 50.5 50.4 50.3
15.0" Soil 58.3 58.3 58.3
36.0" Soil 63.7 63.7 63.7
Delta T1 = T200 - T3 = 5.2 Pasquill Category = E
Delta T2 = T250 - T50 = -0.6 200 ft Winds = 51.7
Delta T3 = T200 - T30 = 0.1 (NRC) Least Dilution = 2.4
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400 Foot Tower Information Thu Oct 22 23:04 PST 2026
Tower Current Temperature Wind Speed
Level Max Avg Min Dir Max Avg Min
-------- ------ ------ ------ ------ ----- ------ ------
400 foot 51.0 50.9 50.8 320.9 20.1 11.6 11.6
300 foot 50.4 50.3 50.2
250 foot 50.7 50.6 50.5
200 foot 50.9 50.9 50.8 300.6 12.7 5.9 5.9
100 foot 51.8 51.6 51.4
50 foot 51.6 51.4 51.1 245.0 6.5 2.8 2.8
30 foot 49.6 49.5 49.4 235.8 4.9 2.7 2.7
3 foot 43.7 43.1 42.4
0.5" Soil 50.9 50.8 50.8
15.0" Soil 58.4 58.4 58.4
36.0" Soil 63.7 63.7 63.7
Delta T1 = T200 - T3 = 7.7 Pasquill Category = E
Delta T2 = T250 - T50 = -0.8 200 ft Winds = 50.9
Delta T3 = T200 - T30 = 1.3 (NRC) Least Dilution = 2.4
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400 Foot Tower Information Thu Oct 22 22:04 PST 2026
Tower Current Temperature Wind Speed
Level Max Avg Min Dir Max Avg Min
-------- ------ ------ ------ ------ ----- ------ ------
400 foot 51.4 51.1 50.9 287.7 22.3 11.1 11.1
300 foot 50.9 50.5 50.3
250 foot 50.8 50.4 50.3
200 foot 50.9 50.5 50.3 254.0 13.2 6.3 6.3
100 foot 51.8 50.3 49.0
50 foot 50.2 48.8 47.9 146.7 7.2 2.7 2.7
30 foot 47.2 47.1 47.1 145.0 5.8 2.2 2.2
3 foot 40.6 40.3 40.0
0.5" Soil 51.1 51.0 51.0
15.0" Soil 58.4 58.4 58.4
36.0" Soil 63.7 63.7 63.7
Delta T1 = T200 - T3 = 10.1 Pasquill Category = F
Delta T2 = T250 - T50 = 1.7 200 ft Winds = 50.5
Delta T3 = T200 - T30 = 3.3 (NRC) Least Dilution = 2.4
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400 Foot Tower Information Thu Oct 22 21:04 PST 2026
Tower Current Temperature Wind Speed
Level Max Avg Min Dir Max Avg Min
-------- ------ ------ ------ ------ ----- ------ ------
400 foot 50.8 50.2 49.5 289.2 11.0 8.5 8.5
300 foot 49.3 49.0 48.6
250 foot 49.2 49.1 48.9
200 foot 49.6 49.4 49.3 227.6 6.1 3.7 3.7
100 foot 50.5 50.3 49.6
50 foot 49.3 49.0 48.6 222.5 6.3 3.8 3.8
30 foot 47.8 47.7 47.5 225.7 5.8 3.3 3.3
3 foot 40.0 39.5 38.9
0.5" Soil 51.3 51.3 51.3
15.0" Soil 58.4 58.4 58.4
36.0" Soil 63.7 63.7 63.7
Delta T1 = T200 - T3 = 9.9 Pasquill Category = F
Delta T2 = T250 - T50 = 0.0 200 ft Winds = 49.4
Delta T3 = T200 - T30 = 1.8 (NRC) Least Dilution = 2.4
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400 Foot Tower Information Thu Oct 22 20:04 PST 2026
Tower Current Temperature Wind Speed
Level Max Avg Min Dir Max Avg Min
-------- ------ ------ ------ ------ ----- ------ ------
400 foot 47.6 47.3 47.1 198.1 3.4 2.1 2.1
300 foot 47.5 47.4 47.4
250 foot 47.9 47.7 47.6
200 foot 48.3 48.1 48.0 188.8 5.7 4.0 4.0
100 foot 48.9 48.5 48.1
50 foot 47.9 47.8 47.7 206.0 6.7 5.5 5.5
30 foot 47.2 47.1 47.0 204.3 6.0 4.7 4.7
3 foot 38.0 37.8 37.6
0.5" Soil 51.5 51.5 51.5
15.0" Soil 58.4 58.4 58.4
36.0" Soil 63.8 63.7 63.7
Delta T1 = T200 - T3 = 10.3 Pasquill Category = E
Delta T2 = T250 - T50 = -0.1 200 ft Winds = 48.1
Delta T3 = T200 - T30 = 1.0 (NRC) Least Dilution = 2.4
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400 Foot Tower Information Thu Oct 22 19:04 PST 2026
Tower Current Temperature Wind Speed
Level Max Avg Min Dir Max Avg Min
-------- ------ ------ ------ ------ ----- ------ ------
400 foot 46.2 46.0 46.0 274.5 2.6 1.9 1.9
300 foot 46.4 46.3 46.3
250 foot 46.5 46.4 46.3
200 foot 47.0 47.0 46.9 240.9 6.7 5.0 5.0
100 foot 48.1 48.0 47.9
50 foot 48.3 48.2 48.1 244.9 5.5 3.3 3.3
30 foot 47.6 47.5 47.5 248.2 5.3 2.8 2.8
3 foot 36.8 36.5 36.4
0.5" Soil 51.8 51.8 51.7
15.0" Soil 58.5 58.4 58.4
36.0" Soil 63.8 63.8 63.8
Delta T1 = T200 - T3 = 10.4 Pasquill Category = D
Delta T2 = T250 - T50 = -1.8 200 ft Winds = 47.0
Delta T3 = T200 - T30 = -0.5 (NRC) Least Dilution = 2.4
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400 Foot Tower Information Thu Oct 22 18:04 PST 2026
Tower Current Temperature Wind Speed
Level Max Avg Min Dir Max Avg Min
-------- ------ ------ ------ ------ ----- ------ ------
400 foot 46.3 46.3 46.2 114.4 2.8 0.6 0.6
300 foot 46.6 46.4 46.3
250 foot 46.6 46.6 46.5
200 foot 47.0 47.0 46.9 56.8 3.1 1.9 1.9
100 foot 47.8 47.6 47.4
50 foot 47.8 47.5 47.3 254.2 3.3 2.3 2.3
30 foot 47.1 47.0 46.8 311.9 3.4 2.5 2.5
3 foot 34.6 34.5 34.3
0.5" Soil 52.1 52.0 51.9
15.0" Soil 58.5 58.5 58.5
36.0" Soil 63.8 63.8 63.8
Delta T1 = T200 - T3 = 12.4 Pasquill Category = E
Delta T2 = T250 - T50 = -0.9 200 ft Winds = 47.0
Delta T3 = T200 - T30 = 0.0 (NRC) Least Dilution = 2.4
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400 Foot Tower Information Thu Oct 22 17:04 PST 2026
Tower Current Temperature Wind Speed
Level Max Avg Min Dir Max Avg Min
-------- ------ ------ ------ ------ ----- ------ ------
400 foot 47.1 46.6 40.3 101.8 9.2 7.3 7.3
300 foot 47.2 47.1 46.9
250 foot 47.3 47.2 47.2
200 foot 47.8 47.6 47.4 83.9 8.4 6.9 6.9
100 foot 48.0 47.9 47.8
50 foot 48.0 47.9 47.6 69.0 4.9 3.7 3.7
30 foot 47.1 47.0 46.9 64.8 4.5 3.2 3.2
3 foot 41.3 36.7 32.2
0.5" Soil 52.5 52.5 52.4
15.0" Soil 58.5 58.5 58.5
36.0" Soil 63.8 63.8 63.8
Delta T1 = T200 - T3 = 10.8 Pasquill Category = E
Delta T2 = T250 - T50 = -0.6 200 ft Winds = 47.6
Delta T3 = T200 - T30 = 0.6 (NRC) Least Dilution = 2.4
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400 Foot Tower Information Thu Oct 22 16:04 PST 2026
Tower Current Temperature Wind Speed
Level Max Avg Min Dir Max Avg Min
-------- ------ ------ ------ ------ ----- ------ ------
400 foot 49.4 48.1 41.9 326.8 4.9 4.0 4.0
300 foot 49.4 49.0 48.7
250 foot 49.4 49.0 48.8
200 foot 49.5 49.2 48.7 321.5 6.0 5.5 5.5
100 foot 49.6 49.1 48.4
50 foot 49.9 49.1 48.5 218.6 6.2 4.9 4.9
30 foot 47.5 47.5 47.4 238.2 6.1 4.3 4.3
3 foot 46.8 45.7 45.2
0.5" Soil 53.2 53.1 53.0
15.0" Soil 58.5 58.5 58.5
36.0" Soil 63.8 63.8 63.8
Delta T1 = T200 - T3 = 3.5 Pasquill Category = F
Delta T2 = T250 - T50 = -0.1 200 ft Winds = 49.2
Delta T3 = T200 - T30 = 1.7 (NRC) Least Dilution = 2.4