Allentown, Pennsylvania Weather Conditions

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Current Conditions

  • 72°
  • Overcast
  • Wind: NNW 5 mph
  • Humidity: 41%
  • Visibility: 10.0 miles
  • Dew Point: 46°
  • Pressure: 30.02 in. -

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Next 12 Hours

2  pm
5  pm
8  pm
11  pm
2  am
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Clear
Clear
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
68°
72°
66°
61°
52°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Thursday
  • Partly Cloudy
  • High: 72 °
  • Low: 48 °
  • Partly Cloudy
  • Friday
  • Partly Cloudy
  • High: 66 °
  • Low: 48 °
  • Partly Cloudy
  • Saturday
  • Partly Cloudy
  • High: 79 °
  • Low: 55 °
  • Partly Cloudy
  • Sunday
  • Partly Cloudy
  • High: 77 °
  • Low: 57 °
  • Partly Cloudy
  • Monday
  • Partly Cloudy
  • High: 73 °
  • Low: 48 °
  • Partly Cloudy

Forecast for Allentown, Pennsylvania

Updated: 11:00 AM EDT on September 18, 2014

  • Thursday

    Partly cloudy. High of 72F. Winds less than 5 mph.

  • Thursday Night

    Partly cloudy. Low of 48F. Winds from the NNW at 5 to 10 mph.

  • Friday

    Partly cloudy. High of 66F. Winds from the ENE at 5 to 10 mph.

  • Friday Night

    Partly cloudy. Fog overnight. Low of 48F. Winds less than 5 mph.

  • Saturday

    Overcast. High of 79F. Winds from the South at 5 to 10 mph.

  • Saturday Night

    Partly cloudy. Fog overnight. Low of 55F. Winds from the South at 5 to 10 mph.

  • Sunday

    Partly cloudy. High of 77F. Winds from the South at 5 to 15 mph.

  • Sunday Night

    Overcast with a chance of rain. Fog overnight. Low of 57F. Winds from the SSW at 5 to 10 mph shifting to the NW after midnight. Chance of rain 50%.

  • Monday

    Partly cloudy. High of 73F. Winds from the NW at 10 to 15 mph.

  • Monday Night

    Clear. Low of 48F. Winds from the NW at 5 to 10 mph.

  • Tuesday

    Clear. High of 66F. Winds from the NW at 5 to 10 mph.

  • Tuesday Night

    Clear. Low of 46F. Winds less than 5 mph.

  • Wednesday

    Partly cloudy. High of 72F. Winds less than 5 mph.

  • Wednesday Night

    Clear. Low of 46F. Winds less than 5 mph.

  • Thursday

    Partly cloudy. High of 73F. Winds less than 5 mph.

  • Thursday Night

    Clear. Fog overnight. Low of 45F. Winds less than 5 mph.

  • Friday

    Partly cloudy. High of 72F. Winds less than 5 mph.

  • Friday Night

    Partly cloudy. Fog overnight. Low of 46F. Winds less than 5 mph.

  • Saturday

    Mostly cloudy. High of 70F. Winds less than 5 mph.

  • Saturday Night

    Mostly cloudy. Fog overnight. Low of 48F. Winds less than 5 mph.

  • Sunday

    Overcast with a chance of rain. High of 70F. Winds less than 5 mph. Chance of rain 40%.

  • Sunday Night

    Clear with a chance of rain. Fog overnight. Low of 48F. Winds less than 5 mph. Chance of rain 20%.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: South Filmore Street, Allentown, PA

Updated: 1:37 PM EDT

Temperature: 74.1 °F Dew Point: 53 °F Humidity: 47% Wind: West at 4.2 mph Pressure: 29.96 in Hourly Precipitation: - Heat Index: 77 °F Graphs

Location: Park Ridge, Allentown, PA

Updated: 1:40 PM EDT

Temperature: 74.3 °F Dew Point: 52 °F Humidity: 46% Wind: Calm Pressure: 29.87 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Whitehall, Whitehall, PA

Updated: 1:40 PM EDT

Temperature: 74.0 °F Dew Point: 51 °F Humidity: 44% Wind: NNW at 2.0 mph Pressure: 29.60 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Hokendauqua, Whitehall, PA

Updated: 1:43 PM EDT

Temperature: 74.8 °F Dew Point: 55 °F Humidity: 50% Wind: Calm Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Fountain Hill - Near ST Lukes hosp., Fountain Hill, PA

Updated: 1:43 PM EDT

Temperature: 77.9 °F Dew Point: 51 °F Humidity: 39% Wind: Calm Pressure: 30.02 in Hourly Precipitation: 0.00 in Heat Index: 79 °F Graphs

Location: Lower Saucon Township, Bethlehem, PA

Updated: 1:43 PM EDT

Temperature: 75.2 °F Dew Point: 53 °F Humidity: 46% Wind: Calm Pressure: 29.77 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: West Bethlehem, Bethlehem, PA

Updated: 1:43 PM EDT

Temperature: 75.0 °F Dew Point: 50 °F Humidity: 42% Wind: NNW at 1.7 mph Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Emmaus, Emmaus, PA

Updated: 1:37 PM EDT

Temperature: 74.3 °F Dew Point: 50 °F Humidity: 43% Wind: Calm Pressure: 29.89 in Hourly Precipitation: - Heat Index: 77 °F Graphs

Location: South Mountain, Bethlehem, PA

Updated: 1:28 PM EDT

Temperature: 73.6 °F Dew Point: 50 °F Humidity: 43% Wind: West at 1.6 mph Pressure: 29.96 in Hourly Precipitation: - Heat Index: 77 °F Graphs

Location: West Allentown, Wescosville, PA

Updated: 1:40 PM EDT

Temperature: 71.4 °F Dew Point: 53 °F Humidity: 52% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Upper Macungie Twp, Allentown, PA

Updated: 1:38 PM EDT

Temperature: 75.4 °F Dew Point: 53 °F Humidity: 45% Wind: NNW at 3.2 mph Pressure: 29.91 in Hourly Precipitation: - Heat Index: 78 °F Graphs

Location: Windermerre Park, Allentown, PA

Updated: 1:38 PM EDT

Temperature: 77.4 °F Dew Point: 50 °F Humidity: 38% Wind: Calm Pressure: 29.91 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Schnecksville, PA

Updated: 1:40 PM EDT

Temperature: 70.1 °F Dew Point: 51 °F Humidity: 50% Wind: North at 4.0 mph Pressure: 30.01 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Macungie Area Weather, Macungie, PA

Updated: 1:43 PM EDT

Temperature: 71.3 °F Dew Point: 51 °F Humidity: 49% Wind: NW at 2.5 mph Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Air Products Campus Wx, Allentown, PA

Updated: 1:43 PM EDT

Temperature: 70.7 °F Dew Point: 51 °F Humidity: 49% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Strawberry Acres, Coplay, PA

Updated: 1:43 PM EDT

Temperature: 71.3 °F Dew Point: 49 °F Humidity: 46% Wind: SW at 4.0 mph Pressure: 29.89 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Bethlehem Township, Bethlehem, PA

Updated: 1:43 PM EDT

Temperature: 75.7 °F Dew Point: 56 °F Humidity: 50% Wind: Calm Pressure: 30.01 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Orefield, PA

Updated: 1:40 PM EDT

Temperature: 72.6 °F Dew Point: 50 °F Humidity: 45% Wind: Calm Pressure: 29.78 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Fogelsville, PA

Updated: 1:43 PM EDT

Temperature: 70.9 °F Dew Point: 54 °F Humidity: 56% Wind: Calm Pressure: 29.77 in Hourly Precipitation: 0.00 in Heat Index: 76 °F Graphs

Location: Pointe West, Fogelsville, PA

Updated: 1:43 PM EDT

Temperature: 76.6 °F Dew Point: 55 °F Humidity: 47% Wind: Calm Pressure: 29.94 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Breinigsville / Lower Macungie, Mertztown, PA

Updated: 1:40 PM EDT

Temperature: 75.4 °F Dew Point: 54 °F Humidity: 48% Wind: West at 2.0 mph Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 78 °F Graphs

Location: Kefallonia Drive, Hellertown, PA

Updated: 1:25 PM EDT

Temperature: 70.0 °F Dew Point: 54 °F Humidity: 56% Wind: NNW at 2.2 mph Pressure: 29.92 in Hourly Precipitation: - Heat Index: - Graphs

Location: Springtown, PA, Springtown, PA

Updated: 1:43 PM EDT

Temperature: 72.0 °F Dew Point: 51 °F Humidity: 48% Wind: North at 3.0 mph Pressure: 30.02 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Washington Township, N3DL, Slatington, PA

Updated: 1:43 PM EDT

Temperature: 73.6 °F Dew Point: 49 °F Humidity: 43% Wind: Calm Pressure: 30.00 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Saratoga Chase, Breinigsville, PA

Updated: 1:31 PM EDT

Temperature: 71.6 °F Dew Point: 49 °F Humidity: 45% Wind: NW at 1.0 mph Pressure: 29.99 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Bath, PA

Updated: 1:43 PM EDT

Temperature: 71.5 °F Dew Point: 53 °F Humidity: 52% Wind: Calm Pressure: 29.98 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

Location: Harlem, Barto, PA

Updated: 1:29 PM EDT

Temperature: 66.7 °F Dew Point: 56 °F Humidity: 69% Wind: Calm Pressure: 30.02 in Hourly Precipitation: 0.00 in Heat Index: - Graphs

Location: Mertztown, Mertztown, PA

Updated: 1:38 PM EDT

Temperature: 72.3 °F Dew Point: 51 °F Humidity: 47% Wind: Calm Pressure: 30.03 in Hourly Precipitation: 0.00 in Heat Index: 77 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service Mount Holly New Jersey 
1211 PM EDT Thursday Sep 18 2014 


Synopsis... 
a weak frontal boundary will move through our area this afternoon 
and evening. High pressure will then build in tonight into Friday, 
before shifting offshore Friday night. A warm front will lift to 
our northwest Saturday, then a cold front is expected to arrive 
late Sunday into Monday. This front will settle to our south and 
east during Monday, then an expansive area of high pressure is 
scheduled to build in for Tuesday and Wednesday. 


&& 


Near term /until 6 PM this evening/... 
with the midday update, we added some isolated showers to the 
forecast for the next couple of hours across portions of far 
southeastern Pennsylvania, far northern Delaware, and Cecil County 
Maryland. Latest radar imagery shows a small area of light showers 
and sprinkles holding together and slowly moving east into these 
areas. In addition, hourly temperatures and dewpoints were also tweaked 
through the afternoon using the lav/lamp guidance to account for 
latest observations and trends. 


Otherwise, the middle-Atlantic is located toward the base of an 
upper trough as seen on water vapor satellite imagery. This large- 
scale trough is associated with an upper low located just to the 
east of Hudson Bay. A cold front stretching from the Gulf of St 
Lawrence southeastward into upstate New York was rather diffuse on the 
13z surface analysis. The cold front will move southward into the middle- 
Atlantic region this afternoon. 


12z iad, apg and okx soundings all observed a shallow saturated 
layer between 800-700 mb with moisture trapped below the middle-level 
subsidence inversion. Modest lift associated with a shortwave trough 
has lead to a band of broken-overcast stratocu over eastern PA, northwest New Jersey 
and the eastern Maryland so far this morning. Tried to time eastward 
progression of the trough and associated stratocu in hourly sky 
grids with the morning update. Latest rap model, which had 
initialized well with current cloud cover, hangs on to the morning 
cloud the longest into the afternoon over southeastern PA and the 
Delaware-Maryland-Virginia. 


Forecast maximum temperatures today in the middle 70s are only a couple of degrees 
below climatology. 


&& 


Short term /6 PM this evening through 6 am Friday/... 
the middle-level trough axis moves off the coast this evening. A surface 
high behind the cold front begins to build in across the area. 


Temperatures will settle in the lower 40s across the southern 
Poconos to the middle 50s across the coastal plain. This is a few 
degrees below normal. 


Could be a bit more cloudiness across the southern zones, but no 
precipitation is expected. Some patchy fog is possible toward 
morning. 


Northwest winds on the lighter side will shift out of the north or 
northeast by the Friday sunrise. 


&& 


Long term /Friday through Wednesday/... 
the overall synoptic setup is comprised of the flow becoming more 
zonal Friday across the northern half of the nation. Some ridge 
development though out west looks to allow a short wave to dive into 
the Midwest Saturday, which results in a trough amplifying across 
the Great Lakes and northeast Sunday through Monday. This trough may 
then start to lift out late Tuesday. It appears the main frontal 
passage occurs Sunday night into Monday, then an expansive surface 
high is scheduled to build across the region Tuesday and Wednesday. 
We used a general model blend for Friday through Sunday, then 
blended in the 00z wpc guidance thereafter. Some adjustments were 
then made after additional collaboration with our surrounding 
offices. 


For Friday...strong surface high pressure should be shifting off the 
New England coast with our low-level flow turning east and 
southeast. There is some moisture forecast to be lingering well 
offshore especially to our southeast, and the onshore flow into our 
area may result in some cloudiness especially at night. The 
potential complication is that the low-level flow may actually veer 
to more southeast or south through Friday night, focusing an 
increase in moisture northwest of the fall line. It is here where 
perhaps some stratus and/or fog develops as the low-level moisture 
pools beneath an inversion. As of now, not quite sure how much 
stratus develops due to some question on how quick the lower levels 
moisten up. For now, we increased the clouds especially at night a 
bit more. The combination of a new airmass and the onshore flow 
should result in a cool day across the cwa, and potentially breezy 
along the coast. 


For Saturday and Sunday...high pressure becomes elongated into the 
middle Atlantic as it weakens and shifts farther offshore. This occurs 
as some warm air advection gets underway ahead of the next system and heights rise 
some. This should result in a northbound warm front that mostly 
slides just to our northwest, and warmer air arrives across our County Warning Area 
especially Sunday with a more southwesterly low-level flow. A short 
wave diving across the Great Lakes will drive a surface low 
eastward. The amplification of the upper-level trough should take 
the main surface low well to our north though during Sunday. The 
associated cold front however will arrive into our area late Sunday 
with some showers. A band of showers may end up weakening with a 
southeastern extent due to much of the large scale lift peeling 
away to the north. The instability looks low therefore we 
continued with no thunder mention at this time. We generally favored a 
blend of continuity and wpc guidance, which paints slight chance to 
low chance probability of precipitation across the County Warning Area mainly Sunday night. Meanwhile, a lead 
short wave near the Carolinas may organize a surface low along an 
old baroclinic zone. This feature should track northeast and have 
no real affect on our sensible weather. 


For Monday and Tuesday...the main upper-level trough may amplify 
some more across the northeast and middle Atlantic regions Monday. 
Based on some ridging entering the plains, an expansive surface high 
is forecast to build across the Midwest and Great Lakes later Monday 
into Tuesday, with this feature arriving into our area during 
Tuesday. Some guidance shows some instability type showers occurring 
just to our north Tuesday as another short wave rotates around the 
base of the upper-level trough. Regarding pops, kept some slight chance 
to low chance probability of precipitation especially Monday morning with the departing cold 
front. We carried a dry forecast for Tuesday as the upper-level 
trough may start to lift out some with any focus generally to our 
north. 


For Wednesday...as a ridge slides across the Great Lakes, a 
potentially strong surface high builds across the northeast and middle 
Atlantic regions. If the center of this high ends up across New 
England, then we will have an onshore flow once again. As of now, 
leaned much closer to the 00z wpc guidance for all weather elements. 


&& 


Aviation /16z Thursday through Monday/... 
the following discussion is for kphl, kpne, kttn, kabe, krdg, kilg, 
kmiv, kacy and surrounding areas 


VFR today and tonight. Stratocu between 5-9 kft progresses eastward 
across the terminals today. Northwest winds under 10 knots today will veer to 
the north this evening and NE by early Friday morning. 


Outlook... 
Friday...VFR through the day, however some low clouds or even some 
fog could develop overnight within an onshore flow. Our confidence 
is on the lower side. 


Saturday and Sunday...some low clouds and/or some fog to start each 
day, otherwise mostly VFR. A cold front arrives Sunday night with 
possible showers and local sub-VFR conditions. 


Monday...some showers possible especially in the morning, otherwise 
mostly VFR with a wind shift to the northwest. 


&& 


Marine... 
buoy 44065 came back on line about 10 PM last night. Hopefully buoy 
44025 will not be far behind. 


Today...long period swells generated by Edouard continue to reach 
the East Coast today. Latest observation show 13-14 second wave periods this 
morning. Seas expected to remain just below Small Craft Advisory levels wit wave 
heights are 4 feet while northerly winds will be around 10 knots 
(gusting to 20 knots late in the day). 


Tonight...swells are still forecast to be with US through tonight. 
Seas will be less than 4 feet. Light northerly winds will increase 
to 20 knots overnight especially across the northern waters. 


Outlook... 
Friday...a northeasterly wind surge with an initial tightening of 
the pressure gradient and cold air advection should then ease some as the winds 
turn east-southeast by late in the day and at night. The surge could 
be enough for some 25-knot gusts and seas building to 5 feet on the 
coastal waters for a time. As of now the winds and seas are 
marginal and therefore will hold off on an advisory. 


Saturday and Sunday...the winds should turn from the south during 
this time frame as high pressure departs to the east. The next cold 
front arrives Sunday night, however an increase in the winds should 
occur ahead of it but they should be below advisory criteria. The 
seas however could be right near 5 feet Saturday from the earlier 
onshore component. 


Monday...the conditions should be below advisory criteria overall as 
winds shift from the north as high pressure starts to build in late. 


&& 


Rip currents... 
in house guidance suggests a moderate risk today for New Jersey/Delaware because of 
long period swells generated by Edouard. 


&& 


Phi watches/warnings/advisories... 
PA...none. 
New Jersey...none. 
Delaware...none. 
Maryland...none. 
Marine...none. 


&& 


$$ 
Synopsis...gorse 
near term...Klein/Kline 
short term...kruzdlo 
long term...gorse 
aviation...gorse/Klein/kruzdlo 
marine...gorse/Klein/kruzdlo 
rip currents...kruzdlo/Klein 












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