Our Proprietary 10-Day Forecast

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Current warnings over Merrifield, Virginia
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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 Merrifield, Virginia 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 Merrifield, Virginia 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 Portsmouth County, VA

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 Merrifield, Virginia

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 Merrifield, VA 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 Merrifield, VA

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 Merrifield, VA, 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 Merrifield, Virginia

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 Portsmouth County, Virginia

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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  • Canadian GDPS GEM
  • German DWD ICON
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  • GEFS, GEPS, MOGREPS & European Ensembles
  • Probabilities & Averages
  • 3-Ensemble Mean & more!
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)
Merrifield, VA Climate Summary

Temperature

    •   Average annual temperature: 55.8°F (13.2°C)
    •   Average January temperature: 34.4°F (1.3°C)
    •   Average July temperature: 79.1°F (26.2°C)
    •   Record high temperature: 106°F (41.1°C)
    •   Record low temperature: -15°F (-26.1°C)

Precipitation

    •   Average annual precipitation: 41.95 inches (106.5 cm)
    •   Average number of rainy days per year: 113
    •   Average snowfall per year: 17.2 inches (43.7 cm)
    •   Record 24-hour rainfall: 8.8 inches (22.4 cm)
    •   Record snowfall in a single storm: 28 inches (71.1 cm)

Humidity

    •   Average annual relative humidity: 67%
    •   Average July relative humidity: 74%
    •   Average January relative humidity: 61%

Wind

    •   Average annual wind speed: 9.1 mph (14.6 km/h)
    •   Average July wind speed: 8.7 mph (14.0 km/h)
    •   Average January wind speed: 9.6 mph (15.4 km/h)
    •   Record wind gust: 75 mph (121 km/h)

Climate Classification

    •   Humid subtropical climate (Köppen climate classification: Cfa)

Additional Information

    •   Merrifield, VA is located in USDA Hardiness Zone 7a.
    •   The growing season in Merrifield, VA is typically from April 15 to October 30, with an average of 198 frost-free days.
    •   The average annual heating degree days (HDD) in Merrifield, VA is 4,824.
    •   The average annual cooling degree days (CDD) in Merrifield, VA is 1,305.

Facts & Historical Information
(made with AI, use with caution)
Natural History

    •   Merrifield is home to the Northern Virginia Regional Park Authority's Lake Accotink Park, a 493-acre oasis with a 50-acre lake, hiking trails, and a wildlife sanctuary.

    •   The park is a haven for birdwatchers, with over 200 species observed, including bald eagles, ospreys, and wood ducks.

Science

    •   Merrifield is the location of the National Institute of Standards and Technology (NIST), a federal agency that conducts research in physical and chemical sciences.

    •   NIST's facilities include a neutron research center, a supercomputer, and a scanning tunneling microscope that operates at the atomic level.

Personalities

    •   Merrifield is named after Richard Merrifield, a 19th-century farmer and landowner who donated land for the construction of a school and church.

    •   The area was once home to prominent scientists such as Dr. Edwin Hubble, who discovered the expansion of the universe, and Dr. James Van Allen, who discovered the Van Allen radiation belts.

Tourist Attractions
1.Tysons Corner Center

is one of the largest shopping malls in the United States, with over 300 stores and restaurants. It is located just a few miles from Merrifield, VA, and is a popular destination for tourists and locals alike.

2.Wolf Trap National Park for the Performing Arts

is a performing arts center located in Vienna, VA, just a few miles from Merrifield. It hosts a variety of performances throughout the year, including concerts, plays, and dance performances.

3.Meadowlark Botanical Gardens

is a botanical garden located in Vienna, VA, just a few miles from Merrifield. It features a variety of gardens, including a rose garden, a Japanese garden, and a butterfly garden.

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