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You’ve probably heard local news media, reporters and meteorologists refer to “precipitation measured at Charlotte Douglas International Airport” (CLT), but have you ever wondered exactly how and where it’s measured on the airfield? It’s critical to any weather event or forecast that might impact CLT, its airline partners and passengers.

As part of our new “CLTea” blog, we are introducing a feature called “Five on the Fly," where we ask five questions about Airport-related topics and interview people who we think you will find interesting.

Our first guest is National Weather Service (NWS) Meteorologist and Observing Program Leader Christopher Horne:

Why is an official weather measurement done at CLT Airport?

We consider weather elements measured at CLT Airport 'official,' meaning that they originate from a trusted government source. Prior to the Automated Surface Observing System (ASOS) commissioning in the mid-1990s, CLT had a National Weather Service (NWS) office on Morris Field Drive. NWS employees there took manual weather observations every hour.

The ASOS at CLT is owned and maintained by the NWS here at Greenville-Spartanburg Airport (GSP) in Greer, S.C. (The Greenville-Spartanburg Weather and Forecast Area extends into parts of North Carolina, South Carolina and Georgia.)

Charlotte-Mecklenburg Storm Water Services and the United States Geological Survey (USGS) also maintain a dense network of automated rain gauges throughout the county called FINS.

Where exactly is the ASOS measuring precipitation at CLT?

The ASOS Sensor Pad is located between Runways 36L and 36C near the Sierra Taxiway across from CLT Fire Station 41.

The ASOS rain gauge at CLT is a ‘weighing-type’ rain gauge (called an AWPAG or All Weather Precipitation Accumulation Gauge), meaning that rain, melted snow and ice collect in a type of ‘bucket.’ The liquid's weight is converted to inches with a resolution to the nearest one-hundredth of an inch. That data is transmitted via fiber optic cable in different forms to different users. The Federal Aviation Administration (FAA) contracts weather observers, whose office is at the base of the new control tower, to augment and back up the ASOS when necessary. They can do this using a manually read standard rain gauge.

The ASOS has a ‘present weather’ sensor that can automatically detect when rain or snow is falling and even assign an intensity to the precipitation. However, the system is not smart enough to tell if sleet or hail is occurring, but the FAA contractors can augment the present weather sensor output to assign the proper type of precipitation.

Since the ASOS cannot measure the amount of snow that has accumulated on the ground, the weather observers there also keep track of the accumulation.

The rain and snow data from CLT is monitored, collected, and quality-controlled here at the NWS office, and then officially archived in the climate data of the United States by folks at the National Centers for Environmental Information (NCEI) in Asheville.

How often are measurements taken?

Precipitation accumulation is constantly monitored/tabulated, and amounts are transmitted externally every five minutes. Common precipitation accumulation intervals are also transmitted hourly with a one-hour total, every three hours with a three-hour total, every six hours with a six-hour total and daily amounts.

Here at the GSP NWS office, we currently have 16 meteorologists on staff. Eleven are forecasters who provide routine 24/7 coverage, and the additional five program leaders and management who are forecaster-qualified, fill in shifts when needed and supplement the forecast staff during active weather events.

NWS electronic technicians are responsible for routine maintenance and repairs on the All-Weather Precipitation Accumulation Gauge and all the other sensors on the ASOS pad at CLT.

What else is measured?

The ASOS Sensor Pad contains a 10m wind tower, on top of which is a sonic wind sensor that constantly measures wind speed and direction. Also on the pad are temperature and dewpoint sensors, a laser beam ceilometer, a visibility sensor and a freezing rain sensor. The ASOS barometric pressure sensors are in a separate location at CLT Airport.

Why is this data so important to CLT and Charlotte?

Like other official automated gauges across the region, rainfall data from the CLT Airport gauge are monitored for rainfall amounts and, most importantly, rainfall rates.

One of the NWS's paramount responsibilities is issuing flood and flash flood warnings. Data from the CLT Airport gauge is used to monitor potential flooding on Airport property and along the various creeks/drainage basins flowing through adjacent areas of the City of Charlotte leading to the Catawba River.

Weather data from the CLT ASOS is used locally by FAA personnel in the tower, Terminal Radar Approach Control (TRACON) and at the Air Route Traffic Control Center (ARTCC). Commercial and general aviation interests use the data for safe flight operations. Local media outlets also use and display the data.

The holidays are here, and there's no better way to spread festive cheer than with the perfect gift. Whether you’re flying out for a holiday getaway or picking up a last-minute surprise for someone special, CLT Airport has everything you need to check off your gift list. From stylish accessories and cozy home goods to one-of-a-kind local treasures, we’ve rounded up a selection of airport finds that are sure to delight. Here’s your ultimate CLT Airport 2024 Holiday Gift Guide.

Pandora 2024 Limited Edition Ornament & Charm Set – $95

Looking for a gift that combines beauty with sentiment? This special edition Pandora set features a beautifully designed nutcracker ornament and charm, making it an unforgettable keepsake for anyone who loves meaningful holiday mementos. Find it on the D/E Connector.

Hip & Humble Danica Jubilee Oven Mitts – $29.95

For the home chef or holiday host on your list, the Danica Jubilee Oven Mitts from Hip & Humble are a festive and practical gift. With their vibrant design and durable, heat-resistant fabric, these mitts bring both style and safety to any kitchen. Find it on the D/E Connector.

The Scoreboard Panthers T-Shirt – $30

For the sports fan in your life, the Panthers T-Shirt from The Scoreboard is a must-have. This comfy, casual tee is perfect for showing off team pride, whether at a game or just lounging around. Find it in Concourse C

iStore Beats Solo Pro – $379.99

Give the gift of exceptional sound this holiday season with the Beats Solo Pro headphones from iStore. These premium headphones offer noise-canceling technology, making them ideal for travelers looking to block out distractions and enjoy their music in peace. Find it in The Plaza.

704 Shop Queen City Cap – $38

Celebrate Charlotte with the Queen City Cap from 704 Shop. This stylish cap is a great way to show local pride, whether you’re at home or traveling afar. Find it on the A/B Connector.

The Market Place Flip Flop Sculpture Sitting Dog – $55

Looking for a unique and whimsical gift? The Flip Flop Sculpture Sitting Dog from The Market Place is a fun and quirky find. Made from repurposed materials, this charming sculpture is both eco-friendly and full of personality. Find it on Concourse A.

Queen City Market First in Flight Mug – $21.99

For those who enjoy a hot cup of coffee or tea, the First in Flight Mug from Queen City Market is the perfect gift. This locally inspired mug celebrates North Carolina’s rich aviation history and makes for a great souvenir or holiday gift. Find it on Concourse B.

Johnston & Murphy Rhodes Backpack – $295

For the person who appreciates luxury and timeless style, the Rhodes Backpack from Johnston & Murphy is an ideal gift. This premium leather bag is perfect for the business traveler or anyone who enjoys classic design with a modern twist. Find it in the Atrium.

Johnston & Murphy Emmalyn Shoe – $168

Looking for something stylish and versatile? The Emmalyn Shoe from Johnston & Murphy is a classic gift that combines comfort with luxury. This beautifully crafted shoe is a great choice for anyone who loves fashion-forward footwear that’s also comfortable for all-day wear. Find it in the Atrium.

Kiehl’s Head-To-Toe Hydrator Set – $46

Self-care is always in season, and the Kiehl’s Head-To-Toe Hydrator Set is a great way to pamper someone special. Packed with nourishing skincare products for the face and body, this set will keep skin hydrated and smooth throughout the winter months. Find it on the D/E Connector.

More Holiday Treasures to Discover

These highlights are just the beginning at CLT – explore the terminal for even more amazing finds. With over 40 distinctive shops, there’s something for everyone on your list and all before you board your flight. Check out all the shopping options on Shop, Dine & Relax directory.

Happy shopping and safe travels from CLT!