Allentown, PA 18102

31°F

Overcast Feels like 31°
  • 3 mph WSW
  • 69%
  • 22°
  • 30 in
  • 7:15 AM
  • 4:35 PM

TONIGHT

29°F
Partly Cloudy

  • 2 mph SSE
  • 10%
  • 4:35 PM
  • Monday

    40° / 29°
  • Tuesday

    43° / 20°
  • Wednesday

    29° / 16°
  • Thursday

    33° / 19°
  • Friday

    34° / 19°
  • Saturday

    35° / 22°

10 Day Forecast

  • Monday

    40° / 29°
    Clouds then Sun 20%
  • Tuesday

    43° / 20°
    AM Snow Showers; Mostly Cloudy 70%
  • Wednesday

    29° / 16°
    A Snow Shower; Windy, Cold 20%
  • Thursday

    33° / 19°
    Partly Sunny and Cold 0%
  • Friday

    34° / 19°
    PM Snow Showers; Brisk, Cold 70%
  • Saturday

    35° / 22°
    Mostly Sunny; Chilly 0%
  • Sunday

    42° / 30°
    Partly Sunny; Less Cold 20%
  • Monday

    44° / 30°
    Mainly Cloudy 30%
  • Tuesday

    42° / 24°
    Partly Sunny 0%
  • Wednesday

    36° / 19°
    Mostly Sunny; Colder 0%
Weather Forecast Discussion

A little light snow on the way Monday night

A shot of arctic air arrives midweek

TODAY:  A few flurries around early; otherwise, clouds will break for some sun.  High: 40 

TONIGHT:  Mostly cloudy, brisk, and cold; a period of snow is likely late, bringing a coating to an inch.  Low: 29

TUESDAY:  A snow shower in spots during the morning; otherwise, mostly cloudy and becoming windy. Much colder overnight.  High: 43  Low: 20

 

After a weekend that brought our first widespread snow of the season on Saturday, we now look ahead to a week that will feature a few more chances for a little light snow, as well as a genuine shot of arctic air that will deliver the coldest air of the season so far by the middle of the week. While there are no big storms in sight, there are no big warm ups either as temperatures will remain around or below average for mid-December for the next seven to ten days.

A few snow showers moved through last night and provided a fresh thin coating of snow for some of us, but they have since departed and sunshine will quickly return Monday as weak high pressure briefly slides into the Northeast. High temperatures should be seasonably cool, topping out around 40, and combined with some sun will lead to some more gradual snow melt.  As we go into Monday night, another chance for snow comes to the region as a clipper low pressure system pushes into the Great Lakes and Northeast. Snow will push across New York and Pennsylvania and then into New Jersey, arriving shortly after midnight and then come to an end early Tuesday morning. A clipper low pressure system typically doesn’t “over-perform” unlike our coastal storm over the weekend. These clipper lows tend to be quick moving and moisture starved so we don’t anticipate a lot of snow, but still the potential will be there for a coating to perhaps as much as an inch or two, mainly from the Lehigh Valley and certainly north and west. Travel conditions may be a little slick overnight Monday into early Tuesday including for your morning commute. The further south and east you go from the Lehigh Valley, the lesser your chances are to see snow and accumulations will be a dusting or less.  Meanwhile, snows will be more sizable and significant to our north across upstate New York and especially New England.

After some early snow or flurries Tuesday, look for clouds to break for some sun with high temperatures topping out pretty close to seasonable levels, in the low 40s. This return to seasonable temperatures will be short lived however as a strong shot of arctic cold air will be building into the region as we go later into Tuesday afternoon and night. As the aforementioned clipper low pressure system moves into maritime Canada, it will strengthen substantially, creating strong northwest winds on its backside. Low temperatures Tuesday night into Wednesday morning will fall back into the teens with wind chill values down in the single digits.

An arctic air mass will be well in place across the region as we work through Wednesday thanks to a deep trough with the jet stream settling in. West-northwest winds will be gusty throughout the day and even though we’ll see some sunshine, high temperatures are only expected to be in the 20s for many of us. Wind chill values will be down in the single digits and teens. It will certainly be a true taste of winter. With the cold winds blowing across the Great Lakes, the lake effect snow machine will once again kick up. Some of this moisture may work across our area in the form of a flurry or snow shower, mainly from the Lehigh Valley north and west.

Overnight low temperatures for the rest of the week will remain well down into the teens but breezes will gradually subside. Another clipper low pressure system will approach the area later this week with increasing clouds and once again a chance for some light snow or snow showers Thursday or Friday. High temperatures will remain cold, likely not getting much above freezing. As we move through next weekend into the start of the following week, we should see a moderation in temperatures as high pressure moves by to our south and low pressure cuts northward through the western Great Lakes. This will lead to a southwesterly wind flow which will help to bring a brief surge of milder air into the East.

Despite the brief warm up, it is likely that the cold air becomes reestablished by the week before Christmas.  But will it be a white one? We have a cold pattern and the active storm track, but there are no guarantees when it comes to Christmas snow. Historically speaking, the chance for a white Christmas in the Lehigh Valley is about 29%, less towards the shore, higher towards the Poconos.  With the cold pattern and occasional show chances in this pattern, the chances this year might be a little higher than average, but we still need some luck. 


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Reading, PA 19605

33°F

Feels like 28°
  • 6 mph SW
  • 70%
  • 24°
  • 30.01 in
  • 7:16 AM
  • 4:37 PM

TONIGHT

30°F

  • 3 mph SSE
  • 10%
  • 4:37 PM
  • Monday

    41° / 30°
  • Tuesday

    44° / 21°
  • Wednesday

    30° / 17°
  • Thursday

    34° / 20°
  • Friday

    35° / 20°
  • Saturday

    36° / 23°

This Week's Circulars

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Historical Averages

High Low
Current 40°F 29°F
Average 41°F 25°F
Record 66°F December 11, 1911 -2°F December 11, 1958

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