Our Proprietary 10-Day Forecast

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Current warnings over Duncannon, Pennsylvania
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<p>Warnings from F5Weather</a></div>

United States weather warnings are issued by various organizations under NOAA. Most from the National Weather Service, but also Storm Prediction Center and National Hurricane Center.

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Current radar over Duncannon, Pennsylvania red dot
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<p>Live radar from F5Weather</a></div>

Our radar is based off of US NEXRAD and Canadian weather radar sites through the quality controlled MRMS system. It compiles various sources for radar data and filters out erroneous returns such as sun spikes and ground clutter. We then colorize the precipitation based on our methods for determining precipitation type. Rain is in shades of green, mixed precipitation and freezing rain in shades of pink and snow is in shades of blue.

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Current satellite over Duncannon, Pennsylvania red dot
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<p>Live satellite from F5Weather</a></div>

Our satellite is from the GOES-16. It is color enhanced by using a geocolor terrain background during the day and black marble city lights at night. The daytime satellite data is Visible satellite imagery, and nighttime uses Infrared bands. The bluish clouds are fog and low cloud. The whiteest clouds are the coldest, highest cloud tops.

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Current surface weather map around Perry County, PA

This surface map is from the HRRR computer model. It is a 1-hour forecast, updated hourly, which is a good estimate of the current surface conditions. This map shows the current high and low pressure centers, pressure isobar contours, wind streamlines and thickness contours. It also shows the currently depicted preciptiation estimates, although this should not be a substitute for actual live radar. The purple dashed contour is the 5400m thickness line, which is often a good proxy for the rain/snow line.

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Temperatures right now near Duncannon, Pennsylvania

This is the latest surface temperatures as depicted by the HRRR computer model, updated hourly. Although these are not actual observations, this model is a very good representation of current conditions as it factors in observations, terrain and physics to give you more detailed temperatures in areas that do not have reporting weather stations. For the latest reports at specific locations, like in Duncannon, PA please see our current conditions data on the left and right side of this page, or go to our current conditions page.

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Surface wind speed map over Duncannon, PA

This map shows the latest HRRR computer model winds. This depiction of the current wind directions and speeds is an estimate from the computer model. For actual observations in Duncannon, PA, see the current conditions data on the left and right side of this page, or go to our current conditions page.

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Regional 24 hour rainfall expected near Duncannon, Pennsylvania

This is a forecast of the amount of precipitation expected over the next 24 hours from the HRRR weather forecast model. This is only one forecast depiction, and you should check other models to get a better idea of what may happen. You can view this and other models in more detail on our main weather forecast maps page. There, you will also be able to look at forecasts beyond just 24 hours and look at forecasts out to as far as 16 days.

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Area snowfall accumulation expected around Perry County, Pennsylvania

This is snowfall forecast, with amounts anticipated in the next 24 hours. This guidance is from the HRRR weather model. For more model forecasts out to 16 days, visit our main weather forecast maps page.

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These are Convective Outlooks from the Storm Prediction Center. Click to see Days 1-3 broken down into Tornado, Wind and Hail threats, as well as days 5-8 outlooks.

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Atlantic Hurricane and Tropical Storm Tracking Map
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<p>Hurricane Tracking from F5Weather</a></div>

Our hurricane tracking map monitors for any current or forecast tropical disturbances in the Atlantic. (See our Pacific Hurricane Tracker) Various hurricane models will draw a 'spaghetti plot' in the Atlantic Basin when a disturbance is forecast or exists, showing the system's forecast track. Once a storm has developed, the National Hurricane Center will forecast their official track. This will show up on the map along with the storm's current intensity, track and name. We will also plot some of the storm's vitals and of course the spaghetti plots from the models along with the NHC forecast track will give you an idea of where it's heading, and its forecast intensity with time.

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To view the latest computer models, visit f5wx.com for access to the weather maps and guidance that meteorologists use to make their forecasts.
 
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View Skew-T soundings, textual data tables for your location, and of course maps! Weather forecast maps of the basics like temperature, wind, pressure, humidity, dew point, cloud cover, simulated radar, travel weather, rainfall and snow are available. More advanced users can also get use out of our severe weather & tornado threat maps, as well as upper air & shear graphics.
 
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Climate Summary
(made with AI, use with caution)
Duncannon, Pennsylvania Climate Summary

General Climate

    •   Humid subtropical climate (Köppen classification: Cfa)
    •   Warm, humid summers
    •   Cold, snowy winters
    •   Precipitation distributed throughout the year

Temperature

    •   Average annual temperature: 53.6°F (12°C)
    •   Average summer temperature (June-August): 74.6°F (23.7°C)
    •   Average winter temperature (December-February): 31.2°F (-0.4°C)
    •   Record high temperature: 102°F (38.9°C)
    •   Record low temperature: -16°F (-26.7°C)

Precipitation

    •   Average annual precipitation: 41.2 inches (1047 mm)
    •   Average monthly precipitation: 3.4 inches (86 mm)
    •   Snowfall: 25.2 inches (64 cm)
    •   Wettest month: May (4.3 inches/109 mm)
    •   Driest month: February (2.4 inches/61 mm)

Humidity

    •   Average annual relative humidity: 70%
    •   Humid summers with average relative humidity of 75%
    •   Less humid winters with average relative humidity of 65%

Wind

    •   Prevailing wind direction: West-southwest
    •   Average wind speed: 9.5 mph (15.3 km/h)
    •   Strongest winds occur during winter and spring

Sunshine

    •   Average annual sunshine: 2,435 hours
    •   Sunniest month: July (280 hours)
    •   Cloudiest month: December (150 hours)

Other Climate Features

    •   Thunderstorms are common during the summer months.
    •   Hurricanes and tropical storms are rare but can occur.
    •   The Susquehanna River, which flows through Duncannon, can cause flooding during heavy rainfall events.

Facts & Historical Information
(made with AI, use with caution)
Duncannon, Pennsylvania, holds a rich history intertwined with natural wonders and notable personalities.

Natural History


    •   The town lies at the confluence of the Susquehanna and Juniata Rivers, creating a diverse ecosystem.
    •   The Susquehanna River was once a major migration route for Atlantic sturgeon, a prehistoric fish species.

Science


    •   In 1804, Lewis and Clark's expedition passed through Duncannon, collecting botanical specimens for their westward journey.
    •   The town was a hub for iron production in the 19th century, with several furnaces and forges operating along the river.

Personalities


    •   John Harris, Jr., founder of Harrisburg, established a ferry at Duncannon in 1753, connecting the east and west banks of the Susquehanna River.
    •   Thaddeus Stevens, a prominent abolitionist and congressman, lived in Duncannon during his youth.
    •   The town is also associated with the legendary Native American chief, Chief Logan, who is said to have delivered a powerful speech at Duncannon's Island Park in 1774.

Tourist Attractions
1.Fort Hunter Mansion and Park

(Harrisburg, PA): This historic mansion and park was built in 1787 by General James Potter, a Revolutionary War hero. The mansion is now a museum, and the park offers hiking trails, picnic areas, and a playground.

2.Indian Echo Caverns

(Hummelstown, PA): These caverns are home to a variety of stalactites, stalagmites, and other geological formations. Visitors can take a guided tour of the caverns, or explore them on their own.

3.Hersheypark

(Hershey, PA): This amusement park is a popular destination for families and thrill-seekers alike. The park features over 100 rides, shows, and attractions, including roller coasters, water rides, and live entertainment.

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Progress, PAColonial Park, PA
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Baltimore, MDWashington, DC
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Allentown, PAColumbia, MD
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Trenton, NJScranton, PA
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