Gulf of Alaska

Noreaster

If lows and highs aloft and at the surface are above one another, the systems will weaken !

Divergencealoft promotesthe surfacelow

Convergencealoft promotesthe surfacehigh

Surfacedivergence

Surfaceconvergence

Longwaves

MIGRATE THROUGHTHE LONGWAVE TROUGHSChapter 10, page 312Aguado & Burt

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Differential temperatureadvection intensifies thewave

Condensation mayrelease even moreheat energy for the storm

Less upper level divergence

No temp advection