|
SEATTLE TRACON GRADIENTS TABLE |
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| created: 10/16/08 03Z |
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| DD/HH | UIL-BLI | OTH-SEA | PDX-BLI | OLM-BLI | SEA-EAT | SEA-GEG | SEA-SMP |
| 16/03 | -3.1 | +0.1 | -1.2 | -1.5 | +2.0 | -0.1 | -0.2 |
| 16/01 | -1.8 | -0.3 | -0.3 | -0.8 | +2.5 | +0.6 | +0.8 |
| 15/23 | -2.0 | -1.0 | -0.6 | -0.6 | +3.2 | +2.0 | +2.4 |
| 15/21 | -1.4 | -1.5 | -0.4 | -0.4 | +2.9 | +2.3 | +2.3 |
| 15/19 | -1.7 | -1.6 | -0.2 | -0.4 | +1.9 | +2.2 | +2.0 |
| 15/17 | -1.3 | -0.7 | +0.1 | -0.3 | +0.7 | +1.8 | +1.9 |
| 15/15 | -1.0 | -0.9 | -0.4 | -0.5 | +0.2 | +1.4 | +1.6 |
| 15/13 | -1.3 | -0.9 | -0.9 | -0.6 | +0.7 | +1.9 | +2.0 |
| 15/11 | -1.2 | -0.8 | -1.0 | -0.9 | +1.5 | +2.8 | +2.3 |
| 15/09 | -0.6 | -0.6 | -1.1 | -0.3 | +1.4 | +2.6 | +1.7 |
| 15/07 | -0.8 | -0.6 | -1.9 | -1.0 | +1.7 | +2.3 | +1.6 |
| 15/05 | -1.0 | -1.2 | -2.0 | -1.1 | +2.2 | +2.6 | +1.2 |
| 15/03 | -1.6 | -2.1 | -2.9 | -1.5 | +3.3 | +3.2 | +0.8 |
| Rules of thumb for estimating wind speed and direction based on local pressure gradients: | ||
| (UIL-BLI) * 10 | = | West wind in Strait of Juan De Fuca if gradient is positive |
| (UIL-BLI) * 5 | = | East wind in Strait of Juan De Fuca if gradient is negative |
|
(OTH-SEA) |
= | South wind at SEA if gradient is positive. North wind if gradient is negative. |
| (PDX-BLI) * 5 | = |
South wind at SEA if gradient positive. North wind if gradient negative. |
|
(OLM-BLI) * 10 |
= | South wind at SEA if gradient positive. North wind if gradient negative. |
| (SEA-EAT) | = | Westerly component at SEA if gradient positive. Easterly if gradient negative. |
| (SEA-GEG) | = | Westerly component at SEA if gradient positive. Easterly if gradient negative. |
| (SEA-SMP) | = | Westerly component at SEA if gradient positive. Easterly if gradient negative. |
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