Category Archives: 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.)

WEEKEND WEATHER OUTLOOK

Following a very long period of warmer temperatures for November, this weekend will be a transitional time to a broad drop in the jet stream over the eastern half of the US for next week.

Saturday will feature a slight drop in the position of the jet and we’ll have cooler temperatures than we’ve had in the past week. Fair skies will prevail.

Canadian (CMC) 540 thickness -red line – Saturday afternoon

On Sunday, the upper air flow relaxes and a return of moisture and milder temperatures is expected with a warm front. Showers expected early Sunday.

A cold front later Sunday afternoon will bring additional showers and precede a more pronounced drop jet, with much colder air for Monday.

The timing of these fronts may change by the weekend. Stay tuned.

CMC Forecast for Monday with 540 thickness line (red)

 

What’s interesting is an ongoing condition that I’m going to refer to as a relative “lack of very cold air” to our north. Of course, it’s still early November, but things just look a little bit warmer than usual to our north—

German ICON Model Temperature Forecast for Monday.

While we’ll get some chillier conditions next week, I don’t see a pronounced or extended period of cold weather for us right now.

WEEK WEATHER OUTLOOK

Following a cold start on Monday, this week’s weather is forecast to be tranquil and increasingly mild. High pressure is expected to set up in the Atlantic and will provide a southwesterly flow of mild air and fair skies.

A weak disturbance will move through Tuesday and another Thursday night with just some cloudiness. Otherwise fair skies.

Temperatures are forecast to reach the mid to upper 60s by the end of the week. Even next weekend is currently expected to be mild and dry.

The next system that might affect us might be the remnants of the latest tropical–“Eta”. The same high pressure system that will provide our nice weather will also block the northern movement of Eta in the short run. However, that won’t be until next week.

WEATHER UPDATE & WEEKEND OUTLOOK

Additional rain is expected Thursday night into Friday morning.  Clearing is expected between 2 and 4 PM Friday.

Friday night and early Saturday morning will feature cold temperatures— at or below freezing for much of the area.

NBM Minimum Temperatures by 8AM Saturday  (Click on image for a larger view.)

Brief outlook for the weekend—

Saturday will be sunny and relatively chilly.  High temps around 48º.

Halloween evening— clear and dry with temps around 40º

Sunday will be milder in the morning with significant cloudiness, but a cold front moves in during the late afternoon preceded and accompanied by some showers/rain.  High near 58, but temps fall again during the evening following a quick dip in the jet stream.


Incredibly, the extended GFS model has another tropical storm/Hurricane forecast in two weeks.