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The Diablo wind is created by the combination of strong inland high pressure at the surface, strongly sinking air aloft, and lower pressure off the California coast. The air descending from aloft as well as from the Coast Ranges compresses as it sinks to sea level where it warms as much as 20 °F (11 °C), and loses relative humidity. [4]
4–7 mph 6–11 km/h 1.6–3.3 m/s 1–2 ft 0.3–0.6 m Small wavelets still short but more pronounced; crests have a glassy appearance but do not break Wind felt on face; leaves rustle; wind vane moved by wind 3 Gentle breeze 7–10 knots 8–12 mph 12–19 km/h 3.4–5.4 m/s 2–4 ft 0.6–1.2 m
The reference wind pressure q is calculated using the equation q = ρv 2 / 2, where ρ is the air density and v is the wind speed. [ 19 ] Historically, wind speeds have been reported with a variety of averaging times (such as fastest mile, 3-second gust, 1-minute, and mean hourly) which designers may have to take into account.
LOS ANGELES (AP) — California was bracing Tuesday for another round of powerful winds that will cause humidity levels to drop and raise the risk of wildfires in much of the state. For the second time in three weeks, a “diablo wind” — notorious in autumn for its hot, dry gusts — was expected to whip up starting in the evening across ...
Section 1 – The storm’s current position, strength, motion, and central pressure. Section 2 – Reported severe weather threats, expected impacts (rainfall, wind, storm surge), and a summary of land watches and warnings issued by the Canadian Hurricane Centre or regional Storm Prediction Centres.
A brief, sudden increase in the speed of the wind, usually lasting less than 20 seconds. Gusts are more transient than squalls and are followed by a lull or slowing of the wind speed. They are generally only reported by weather stations when the maximum wind speed exceeds the average wind speed by at least 10–15 knots (12–17 mph). gust front
[1] [2] In places where trees or structures impede the near-surface wind, the use of a constant 1/7 exponent may yield quite erroneous estimates, and the log wind profile is preferred. Even under neutral stability conditions, an exponent of 0.11 is more appropriate over open water (e.g., for offshore wind farms), than 0.143, [ 3 ] which is more ...
Blowing dust advisory NPW – Considerable blowing sand or dust are expected to reduce visibilities to between 1 ⁄ 4 and 1 mile (0.40 and 1.61 km) or less, but greater than 1 ⁄ 4 mile (0.40 km) over a widespread or localized area, caused by strong sustained winds of 25 miles per hour (40 km/h) or greater.