Philadelphia Weather Outlook

INTERESTING WEATHER PATTERN FOR PHILADELPHIA AREA

The weather has been mild and quiet recently.  However,  changes are expected over the next week as a highly amplified pattern develops. The trend is a change to much colder weather next week.

Tomorrow, Monday, will be a rainy, windy day.  Jet energy from both the northern jet and southern jet will phase and result in deep low pressure development over the Great Lakes.  Some of that energy will move down to cause GUSTY WINDS (up to 40 mph)  for us on Monday—

GEFS 300 mb (jet level) winds Monday showing jet streak energy from southern and northern streams  (Click on image for a larger view.)   ALSO NOTE THAT THE NEXT IMPULSE IS VISIBLE IN MONTANA

It will still be mild on Monday, but colder air moves in later Monday and Monday night.

Notice that the jet flow makes a loop over high pressure in the Mid-West and another high energy impulse is waiting in the wings for later in the week.

There’s much uncertainty about timing of this next impulse with how these things are going play out later in the week, but some models are showing snow for central and western Pennsylvania.

For us, it will be rainy, windy and cold Friday and unsettled and cold next weekend. NO SNOW for us at this time. Stay tuned.

GEFS Saturday 10 PM (Click on image for a larger view.)
Philadelphia Area Weather Forecasts

WEEKEND WEATHER FORECAST

Friday’s low level stratocumulus cloudiness will linger into early Saturday morning.

High pressure builds in for the weekend.  However, the early part of Saturday will still be influenced by an upper trough that swings through during the morning, accompanied by several weak disturbances (areas of “vorticity”— think of them as eddy currents.)  So while the sun will try to break out Saturday morning, there will be additional periods of cloudiness later in the morning until early afternoon.

Sunday will be influenced by an upper ridge, surface high pressure and a southwesterly flow of air.

Saturday—

  • Cloudy early morning, then sunshine.
  • A periods of cloudiness may return late morning into noontime, mid afternoon, then sunshine returns  (updated)
  • Low temperature early morning 39.4º sd 3.0º (NBM model) Blue Bell
  • High temp 54.6º sd 1.1º (NBM model) Blue Bell area.
  • Winds NW 9 mph becoming gusty to 16 mph around noon

Some interesting weather for Monday as a highly amplified dip the jet flow induces strong low pressure development in the Great Lakes area—

GEFS jet stream Monday. (Click on image for a larger view.)

Temperatures will be chilling down next week.

Weather… and Other Things 'Up in the Air'