The instability cloudiness and showers we had today will dissipate tonight as cold high pressure builds in for Tuesday behind the departing upper air low.

Tuesday will be

• Sunny with some fair weather clouds
• Unseasonably cool. High temp 57.2º sd 1.6º
• Winds from the NW  7-10 mph, occasional higher gusts.
  

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The anomalous dip in the jet bringing this cool weather will transform to more of a ridge pattern by Thursday and especially Friday.

A Bermuda high will bring much warmer temperatures.   Friday’s high temps will likely approach 81º (model blend), but some thunderstorms later on Friday will move in ahead of another cold front—

The extended range models show a much more seasonable temperature pattern developing after this week.

Clouds forecast for Sunday morning never materialized.

For Monday — Surface low pressure combined with an upper air low moving to our north will bring a weak cold front through early Monday morning.

Instability with the upper low causes clouds to linger and allows the chance of light showers and sprinkles through much of the early part of the day.

• Cloudy in the morning with widely scattered light sprinkles and showers, especially early.
• In the afternoon, a mix of clouds, sunshine.  Still chance of a sprinkle.  Breaks of sun more likely as the afternoon progresses.
• High temp 59.1º sd 1.6º
• Winds 7-10 mph W. Increasingly gusty 17 mph  during the day.
• Total QPF 0.06 inches rain

[su_note note_color=”#ffffff”]Updated Sun 07:03 AM — Late night models have backed off of the cloudiness in PHL, but keep the morning cloudiness prediction from Norristown, west and north. [/su_note]

[su_note note_color=”#ffffff”]Updated Sat 11:13 PM — Tonight’s models have considerable mid-level cloudiness Sunday morning, more sun in the afternoon .[/su_note]

Last night’s forecast went pretty good.  I checked our home’s security cameras and we had some snow flurries about 5:10 AM this morning. The temperature early this morning was 31º.

We also had the clouds move in this afternoon and the radar currently shows some widely scattered sprinkles.

Tonight’s minimum temp  35.4º sd 1.6º

The forecast for Sunday hasn’t changed much .  We’ll still be under the influence of an upper air trough so temperatures, while warmer than today, will still be below average.

• Some cloudiness in the morning especially north and west of the city, then mostly sunny.
• Winds WSW 10-12 mph with gusts to ~ 20mph
• High temp 61.3º sd 1.3º