Cut-off low

Kona Low over Hawaii, an example of a cut-off low from the main core of the jet stream.[1]

A cut-off low (or cutoff low), sometimes referred to as the weatherman's woe, is defined by the National Weather Service as "a closed upper-level low which has become completely displaced (cut off) from basic westerly current, and moves independently of that current." Cut-off lows form in mid-latitudes (usually between 20° and 45°) and can remain nearly stationary for days.[2]

  1. ^ Kona Low over Hawaii The Earth Observatory
  2. ^ Buzz word: 'Cut-off low' to bring rain to DMV most of the week WUSA-TV