WEEKEND WEATHER FORECAST

[su_note note_color=”#defcdc”]Update Fri 11 PM: Tonight’s NAM and GFS have moved the rain start time to 3- 6 PM on Sunday.[/su_note]

An upper air ridge will continue to bring us mild temperatures. The upper ridge will break down as low pressure approaches and moves up through the Great Lakes from Sunday into Monday.  A secondary coastal low will develop on Monday

Saturday will be sunny in the morning, but throughout the day, high cirrus clouds will increase in sky coverage.  High 54.  Light winds.

Low pressure will gradually affect our weather on Sunday.  Sunday will be cloudy and increasingly windy.  As discussed in previous posts, rain should hold off until late afternoon and evening. (5-7 PM). High 52.

The rain should become heavy late Sunday night and continue into Monday. Monday was expected to be very warm with temps near 60º, but the models are suggesting a coastal low formation which may bring winds in from the northeast, lowering the high temperatures.

WEEKEND WEATHER UPDATE

As mentioned Thursday afternoon, the trend has been for rain to begin later in the day on Sunday.  The NAM and Canadian models have light rain starting very late afternoon or evening (~5 -7PM).

The GFS has trended later as well, about 4 PM.

Here’s the latest National Blend of Models (NMB v 3.2) precipitation forecast for 7 PM Sunday evening. Notice how light the rain is forecast to have fallen by that time.

NBM 3 hour rain totals for 7 PM Sunday Click for larger image

So, the trend is for a cloudy but mostly dry Sunday until later in the day.

It will be mild!  Here’s the EKDMOS high temps for Blue Bell, PA-

Ensemble Kernel Density Model Output Stats- Temp Blue Bell

I’ll update Fri evening.