Summary - large-scale pattern

  • Low pressure deepened slowly to 1002 mb while tracking northeast along the east coast.
  • Forcing for upward motion over the northern mid-Atlantic was implied by a favorable location within the right entrance region of a strong upper jet.
  • The 500 mb trough lifted northeast along the east coast. The trough became negatively tilted but did not close-off.
  • The 700 mb low tracked from southwest to northeast across Pennsylvania while deepening slowly.
  • A southerly low-level jet developed in the entrance region of the upper jet, transporting large-amounts of moisture north along the east coast.


Slide 12