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Winter in the West

During low index patterns, these frontal systems can be quite deep, even extending into southern California, producing cold-core lows and showery weather. This also tends to allow moisture to circumvent the Sierra Nevadas through the Mojave Desert into the Great Basin, causing snowstorms eastward into Utah. These deep storm systems are particularly favored during El Nio years (the pattern this winter is neither El Nio nor La Nia), but they can occur in any season and theyll definitely have impacts on your flying plans.

Gemini Sparkle

Key Takeaways:

  • Contrary to popular perception, winter flying in the Western US presents significant hazards comparable to the East, influenced by patterns like the zonal index and the southward shift of the polar jet stream.
  • Major storm systems, including Pacific fronts and moisture-laden "Pineapple Express" atmospheric rivers linked to the subtropical jet, bring extensive icing, turbulence, IFR conditions, and heavy precipitation to coastal and mountain regions.
  • Unique regional phenomena pose additional risks: deep Arctic cold waves can create severe canyon winds and mechanical turbulence, while Great Basin highs lead to persistent valley fog/stratus and contribute to dry, gusty Santa Ana winds with associated wildfire dangers in Southern California.
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What comes to mind when winter hits? In the east we think of Nor’easters, snowstorms in the Great Plains, and IMC in the southeast. We think of the western states as dominated by clear skies and light winds. Our perceptions are probably influenced a bit by the constant news of drought and wildfires, the sunny ambience of Hollywood movies, and maybe that 1970s song about it never raining in southern California.

If you’ll be flying west of the Rockies, though, don’t let your guard down. Reality is that the West is not always blessed with clear skies and mild weather. The worst of the flying hazards occur during the winter, and some of them can be just as severe as the problems out east. Thankfully we’ll sort things out and help you figure out what to expect.

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