Philadelphia Weather Outlook

WEATHER OUTLOOK

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A generally dry period is coming up from today, Wednesday, through Monday.  Temperatures will be cool to seasonable 53-60 (average high is 60º).

Late Thursday into early Friday morning, the retrograde low pressure to our east may cause some light showers.   Also some higher winds.

(Higher winds are not a “wind tunnel effect”, as some the TV weather entertainers call it. Winds are caused by pressure gradients between adjacent systems, higher gradients, higher winds.  A wind tunnel is described here.  Such a thing as a “wind tunnel effect” can best be felt at the corner of 15th and Chestnut Street on a windy day.  I wince every time I hear that term used so incorrectly. )

We are switching from a cyclonic pattern to a large scale upper air “ridge” pattern from the latter part of the weekend into next week.

GEFS depiction cylonic trough in yellow  (click for larger image)

Upper Air Ridge Pattern next week:

GEFS forecast for Tuesdays showing upper ridge

Here are the EKDMOS temperatures for the coming days:

EKDMOS High Temps

With things quiet, check back for the regular WEEKEND WEATHER FORECAST on Friday evening.

Philadelphia Area Weather Forecasts

WEDNESDAY FORECAST

Update 11 pm- Tonight’s models have much more sunshine and no showers on Wednesday.

Low pressure moving to our south will merge and stack with an upper closed low far off the coast.  It will intensify, expand and possibly retrograde back westward, affecting our weather through Friday.  Closed low patterns are difficult for the models.

Wednesday will be mostly cloudy, some bright spots and possibly some sun mid-day.  High 52.  It will become WINDY in the afternoon and increasingly cloudy late afternoon.

There’s a chance of light sprinkles in the early morning and again late afternoon.

Best time to exercise outside is late morning and early afternoon.

Weather… and Other Things 'Up in the Air'