If you’ve ever stood on a launch pad before a weather balloon lifts off, or watched the readout of upper-atmosphere temperature, pressure, and humidity scroll across a screen, you’ve probably wondered: how often do we actually collect this data? As the owner and lead engineer at a meteorological sounding system supplier, I get this question all the time—from new weather forecasters just learning the trade to long-time atmospheric researchers who’ve relied on our gear for decades. The short answer is, it’s not a one-size-fits-all number. It depends on what you need the data for, where you’re working, and what tools you’re using to collect it. Let me break this down, because getting the frequency right isn’t just a technical detail—it’s what makes weather forecasts accurate, keeps research missions on track, and even saves lives during severe weather events. Meteorological Sounding System
First, let’s start with the basics: what is a meteorological sounding? A sounding is the measurement of atmospheric conditions from the surface all the way up to the stratosphere, sometimes 30 kilometers or higher. The oldest and most common method is radiosondes attached to weather balloons—simple, lightweight packages of sensors that drift up as the balloon pops at altitude, and transmit data back to a ground station. Other methods include ground-based remote sensing systems, like radio acoustic sounding systems (RASS) or lidar, and even satellite-borne sounders. Each of these has a different data collection frequency, so let’s go through the most widely used systems first.
For routine upper-atmosphere monitoring, the gold standard is the radiosonde, and here the frequency is pretty consistent across most of the world. The World Meteorological Organization (WMO) sets global standards, and for operational weather forecasting, launches happen twice a day—every 12 hours, at 00:00 UTC and 12:00 UTC. That means at 6 a.m. and 6 p.m. local time in most places, a weather balloon is lifting off from stations across every continent, from the Arctic tundra to the middle of the Sahara. At our company, we supply radiosondes to national meteorological services, so we’ve seen how this schedule works for their needs. Let’s think about why twice a day: weather systems don’t move that fast, especially not mid-latitude cyclones or jet streams, so a 12-hour gap gives forecasters enough data to track how pressure systems are developing, how warm or cold air is moving in, and where moisture is accumulating. If we launched every hour, we’d have way too much redundant data, wasting resources on balloons and transmission time. If we launched once a day, we’d miss critical shifts in the upper atmosphere—like a sudden jet stream dip that could spark a tornado, which is exactly the kind of event forecasters need to catch early.
But wait, that’s just routine. What if you’re dealing with severe weather? Tornado outbreaks, hurricanes, winter blizzards—these are the times when meteorologists need more data, not less. In those cases, we see launch frequency jump to every six hours, sometimes even every three hours, depending on the event. Last year, during Hurricane Ian, our team shipped extra radiosondes to the National Hurricane Center’s launch sites in Florida, and those teams were launching balloons every six hours for three straight days. Why? Because hurricanes are dynamic, fast-moving systems, and the upper-atmosphere wind shear—the difference in wind speed and direction between the lower and upper atmosphere—can make or break how strong a storm gets. If wind shear is low, the storm can intensify quickly; if it’s high, it falls apart. To measure that, you need frequent soundings through the storm’s core, not just twice a day. We also work with university research teams that study tornadoes, and during field projects in the Great Plains, they’ll launch a balloon every hour for a week straight, chasing supercells to get a snapshot of what happens right before a tornado forms. For these teams, the tradeoff is cost and logistics—more balloons mean more people to launch, more sensors, more data processing—but when lives are on the line, that tradeoff is worth it.
Now, what about other types of sounding systems, not just weather balloons? Let’s talk about ground-based remote sensing, which is a growing part of the meteorological world. For example, a radiosonde only gets data as it drifts up, but a fixed lidar or microwave radiometer can collect data continuously, every few seconds, all day long. Wait, that’s a big difference! Why would you use a remote sensing system if radiosondes are standard? Because remote sensing gives high-frequency data in between those twice-daily radiosonde launches, filling in the gaps. For example, if you’re studying the boundary layer—the part of the atmosphere closest to the surface, where most of our weather happens—conditions can change in minutes, especially on a hot, sunny day when the air near the ground warms up and rises. A ground-based radiometer can measure temperature, humidity, and wind every 10 seconds, which is way more frequent than a radiosonde. That data is perfect for studying fog formation, or how wildfire smoke mixes through the boundary layer, or for improving short-term forecasts (the 0-2 day range, which everyone uses for their daily plans). We’ve seen a lot of rural and mountainous areas adopt these systems because they can’t support twice-daily radiosonde launches (it’s expensive to run a full launch site), so a fixed remote sensing system is a more affordable alternative that still gives frequent data.
Satellite sounders are another key piece here. Geostationary satellites—those that stay fixed over one spot on the equator, like GOES in the U.S. or Meteosat in Europe—collect data every 5 to 15 minutes over a specific region. That’s way more frequent than polar-orbiting satellites, which pass over a spot twice a day, same as radiosondes. Geostationary satellite data is game-changing for tracking fast-changing events like thunderstorms, where a storm can go from a few cumulus clouds to a severe threat in an hour. For example, if you’re in the Southeast U.S. during summer, you can watch thunderstorms develop on GOES data every 10 minutes, which gives forecasters time to issue warnings before the storm hits. As a supplier, we work with customers that integrate both ground-based and satellite data into their sounding systems, so they get the best of both: frequent, high-resolution data for short-term events, and the vertical profile data that only in-situ sensors (like radiosondes) can give.
Let’s also talk about vertical resolution, which ties into data collection frequency, even if it’s a different detail. A radiosonde doesn’t just send one temperature reading every 12 hours—it sends a reading every 0.5 to 2 seconds, which translates to a vertical resolution of about 10 to 50 meters as it drifts up. That means you get a detailed profile of how temperature changes with height, which is way more useful than a single reading. If a customer wants higher vertical resolution, we can adjust the sensor’s sampling rate to collect data every 0.1 seconds, which gives a finer profile—though that uses a bit more battery, so the balloon might drift a little slower. It’s a balance between resolution, frequency, and sensor lifespan, something we help our customers with every day.
I’ve learned a lot about this over the 12 years I’ve been running our sounding system company. Early on, I’d get calls from small towns that wanted to launch a weather balloon every day, not just twice. They thought more data would mean better forecasts, but when I walked them through the WMO standards and their actual needs—like they only needed data to plan local agriculture irrigation—twice a day was enough. I’ve also worked with a team studying polar stratospheric clouds, which form only a few times a year at high latitudes, and they needed a sounding every hour for three weeks to capture the exact conditions that create those clouds. The key here is matching the data collection frequency to the use case, not just the latest technology.
What happens if you get the frequency wrong? Too infrequent, and you miss a critical weather shift. A few years ago, a coastal community in Canada was using a single radiosonde launch a day during the winter, and when a powerful winter storm came in, forecasters didn’t have upper-atmosphere wind data to know how fast the storm would move, so the warning was issued too late. They switched to launching every six hours during winter storms after that. Too frequent, and you waste resources. I had a customer in Africa that was launching radiosondes every hour during a non-severe season, and they were going through twice as many sensors as they needed, driving up costs without any benefit to their forecasts. That’s the kind of problem we help solve—we don’t just sell equipment, we work with customers to design a data collection schedule that fits their budget and their goals.
As climate change makes weather systems more extreme and unpredictable, the demand for flexible, high-frequency sounding data is growing. We’re seeing more customers mix radiosondes, ground-based remote sensing, and satellite data to get a full picture of the atmosphere, with adjustable frequencies for different events. For example, last year we shipped a custom sounding system to a group of researchers in the Amazon, where deforestation and weather patterns are shifting fast. They wanted twice-daily routine launches, plus the ability to add hourly launches during dry seasons when wildfire risk is high, and continuous lidar data to track how smoke moves through the atmosphere. That’s exactly the kind of solution we built our business for—one that adapts to what the customer needs, not a one-size-fits-all setup.
If you’re a weather forecaster, a researcher, a farm manager, or someone who just needs reliable atmospheric data, the first step is to figure out what you need that data to do. Do you need to track daily weather patterns? Twice-daily is standard. Do you need to prepare for a hurricane or tornado? Scale up to every three or six hours. Do you need high-resolution data for short-term events or boundary layer studies? A ground-based system with continuous sampling is the way to go. The worst thing you can do is pick a frequency that doesn’t match your use case, leading to wasted money or missing critical data when you need it most.
At our company, we’ve been supplying meteorological sounding systems for over a decade, and we’ve helped hundreds of customers—from small municipal weather offices to large national research programs—get the right data at the right frequency. If you’re looking to upgrade your sounding system, or you’re not sure what frequency of data collection you actually need for your work, we’re here to help. We don’t push expensive, overcomplicated equipment; we take the time to listen to your goals, walk you through the options, and build a solution that works for you. Whether you need routine twice-daily launches, flexible high-frequency data for severe weather, or a mix of in-situ and remote sensing tools, we have the expertise to make it happen. Don’t let technical jargon or confusing standards hold you back—reach out today to start a conversation about your meteorological sounding needs.
Meteorological Sounding System References:
World Meteorological Organization. Guide to Meteorological Instruments and Methods of Observation, 2020.
American Meteorological Society. "Radiosonde Data and Applications," 2022.
National Oceanic and Atmospheric Administration. "Hurricane Research Sounding Protocols," 2021.
International Association of Geodesy. "Ground-Based Remote Sensing for Atmospheric Sounding," 2019.
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