Monthly Archives: April 2019

Philadelphia Weather Outlook

WEEKEND WEATHER OUTLOOK

[su_box title=”Weather Outlook Update Tues PM ” box_color=”#defcdc” title_color=”#000000″]I posted this weekend outlook Tues morning and things have already changed regarding timing. The front that moves through Friday may linger just to our south to allow some instability showers on Saturday afternoon.

The large low pressure system forecast to bring rain for Sunday may move in later in the day, keeping Sunday dry for much of the day. [/su_box]

It’s April, and that’s where we get the expression, “April showers brings May flowers.”

This coming weekend, or at least Saturday, appears to be sandwiched between two low pressure systems— one Friday afternoon/night and another stronger low pressure system on Sunday.

Timing can change this far out in the forecast period, but the models have been fairly consistent with these two systems.

It appears that Saturday will be mostly sunny and warm.  High temperature possibilities show 70s for Saturday, but the statistical spread in the EKDMOS (Ensemble Kernal Density Model Output Statistics)  is quite large, indicating uncertainty in the forecast.

EKDMOS for this week’s temperatures

For Sunday, it appears we’ll be having rain.  Notice the lower spread in the temperatures suggests greater certainty in the temp forecast and weather for Sunday’s weather.

As usual, I’ll update Friday evening.

Philadelphia Area Weather Forecasts

WEEKEND WEATHER FORECAST

[su_box title=”Saturday AM Update ” box_color=”#defcdc” title_color=”#000000″]Low level moisture that was forecast in the form of fog and low clouds has remained this Saturday morning. We should see a gradual brightening of skies through the morning and the afternoon. It’s a tough call if the grey skies will totally dissipate today, but the model cloud algorithms say it will.

Sunday looks to become cloudy in the afternoon.[/su_box]

Low pressure will slowly depart overnight. Showers should end before daybreak Saturday.

The models, particularly the GFS, maintains significant low level moisture for the morning and at times during the afternoon on Saturday.  So, while the model cloud algorithms have the clouds dissipating slowly in the morning, it’s possible we may see lingering low level clouds into the afternoon. High temperatures between 65 and 67, depending upon the cloud cover. Winds will be light from the W-NW

Sunday will start sunny and it will be milder.  Clouds move in during the afternoon. High 68.  Winds light, but become southerly and increasingly gusty in the later afternoon.