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Ordinary skies, strange reports, and how UFO sightings get identified.

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Following a UFO With the Wind

Wind direction and altitude data can show whether a slow object was likely a balloon, lantern or other drifting source.

On this page

  • Surface versus upper winds
  • Drift path reconstruction
  • When wind data is not enough
Preview for Following a UFO With the Wind

Introduction

Wind data can turn a vague “slow UFO” report into a testable drifting-object case. Balloons, sky lanterns and other lightweight objects do not choose their own route; once airborne, they are carried by winds that may change sharply with height. That means the useful question is not just “was it windy?” but “which way was the air moving at the object’s likely altitude?” Surface wind, upper-air soundings, weather models and trajectory tools can all help reconstruct whether a reported light or object followed the wind closely enough to be a balloon or lantern. This evidence is strongest when the sighting has a good time, location, viewing direction and observed path. It is weakest when the object’s height is unknown, the report lacks a track, or local winds were variable.

Overview image for Wind Data

Surface wind is only the first clue

A common mistake in UFO discussions is to check the wind at ground level and treat it as the answer. Surface wind is useful, especially for objects released near the ground, but it is not automatically the wind that controlled the object during most of the sighting. The Met Office explains that wind is normally measured on a 10 metre mast, and that speed and direction are affected by terrain and nearby obstacles; it also notes that wind speed increases with height. In other words, a weather station reading can describe the air close to the surface without describing the air hundreds or thousands of metres above the witness. [Met Office]weather.metoffice.gov.ukMet OfficeHow we measure windWind direction is measured by a vane consisting of a thin horizontal arm carrying a vertical flat plate at o…

This matters because many drifting UFO candidates climb. A small party balloon, a weather balloon or a sky lantern may begin in the surface layer, then enter air moving at a different speed or direction. A witness may therefore report a light travelling north-east even though the local ground wind felt like it was coming from somewhere else. That apparent contradiction does not rule out a drifting source; it may simply mean the object had risen into a different wind layer.

There is also a direction-language trap. Meteorological wind direction is normally given as the direction the wind is coming from, not the direction an object will travel. A westerly wind comes from the west and carries a free-floating object towards the east. The National Weather Service gives the same convention for wind barbs: the shaft points towards the direction from which the wind is blowing. Misreading that convention can reverse a drift analysis and make a plausible balloon path look impossible. [National Weather Service]weather.govSource details in endnotes.

For a first-pass check, surface observations can still be valuable. If a cluster of orange lights is reported leaving a field or wedding venue and drifting exactly downwind at low altitude, a lantern explanation becomes stronger. If the reported object moves directly against both the surface wind and the likely winds just above the ground, the balloon or lantern explanation becomes weaker. The point is not that surface wind is irrelevant; it is that surface wind alone is rarely enough.

Upper winds explain why drifting lights change course

The best wind evidence for balloon-like UFO reports usually comes from upper-air data: measurements of wind speed and direction at different heights. Radiosondes are lightweight instrument packages carried by weather balloons. The World Meteorological Organization describes a global network of around 1,300 upper-air stations, where radiosondes attached to free-rising balloons measure pressure, wind velocity, temperature and humidity from near the ground up to around 30 kilometres. More than two thirds of those stations make observations at 0000 and 1200 UTC. [World Meteorological Organization]community.wmo.intSource details in endnotes.

National weather services explain the same basic method in practical terms. NOAA says radiosondes provide pressure, temperature and relative humidity data, while wind speed and direction are derived by tracking the radiosonde’s position as it rises. The U.S. National Weather Service similarly says winds aloft are obtained by tracking the radiosonde in flight using GPS or radio direction finding. [noaa.gov]noaa.govOpen source on noaa.gov.

For UFO investigation, this vertical profile is the important part. A balloon sighting may appear strange because the object changes direction, slows, accelerates, or seems to curve without any visible propulsion. But if upper-air data shows winds veering or backing with height, that behaviour may be normal drift through layered air. A balloon climbing through those layers can trace a path that looks intentional from the ground.

This is especially relevant to weather balloons. Historic UFO investigations treated balloons as a regular source of reports. Project Blue Book materials noted that balloons continued to be reported as UFOs and that there were several types, including weather balloons, rawinsondes, radiosondes and large research balloons; at night, balloons carrying lights could have an unusual appearance. [whs]esd.whs.milEnterprise Services Dashboard Project Blue BookEnterprise Services Dashboard Project Blue Book

A useful modern archive for this work is NOAA’s Integrated Global Radiosonde Archive, which contains radiosonde and pilot-balloon observations from more than 2,800 stations, with recent data available in near real time from hundreds of stations. The University of Wyoming’s widely used sounding archive is another practical source, presenting upper-air soundings with wind speeds and heights in meteorological or aviation units. [NCEI]ncei.noaa.govNCEIIntegrated Global Radiosonde Archive (IGRANCEIIntegrated Global Radiosonde Archive (IGRA

Wind Data illustration 1

Reconstructing a likely drift path

A drift reconstruction starts with the witness report, not with the weather data. The necessary inputs are the observation time, location, direction of view, apparent path across the sky, duration, brightness, colour and whether the object rose, descended, faded, burst or disappeared behind cloud. Wind data can then be used to ask whether a passive object would have moved through the reported part of the sky.

A practical reconstruction usually follows this sequence:

  1. Fix the time window. Convert the sighting time to the correct time zone and compare it with available weather observations before and after the event.
  2. Separate ground release from airborne drift. A lantern launched nearby may be controlled mainly by low-level winds; a weather balloon or high-altitude research balloon may require upper-air winds.
  3. Check direction correctly. Convert wind “from” direction into expected object travel direction. A wind from 270 degrees pushes a drifting object broadly towards 90 degrees.
  4. Compare the reported bearing. A balloon explanation is stronger if the object’s apparent motion across the sky matches the wind-driven track from a plausible release area.
  5. Test the altitude options. If the report could involve a low lantern, compare low-level winds; if it could involve a larger balloon, compare winds through the likely ascent levels.

The stronger cases are those where the same explanation accounts for several features at once. A group of warm orange lights rising from one horizon, spreading out, drifting downwind and fading after several minutes fits sky lantern behaviour better than a powered craft. A bright white or silver object that remains visible in daylight, climbs slowly, changes apparent direction with upper winds and disappears at great height fits a balloon more naturally than a vehicle under active control.

Trajectory models can make this more rigorous. NOAA’s HYSPLIT model simulates atmospheric transport and trajectories over local to global scales. NOAA describes it as a system for computing trajectories and dispersion through the atmosphere, and its READY web interface can run trajectory products using meteorological data. [Air Resources Laboratory]arl.noaa.govAir Resources Laboratory HYSPLITAir Resources Laboratory HYSPLIT

For UFO work, a trajectory model is not a magic identifier. It is a plausibility test. If a suspected balloon’s estimated start point, time and height produce a path consistent with the sighting, the balloon explanation improves. If repeated runs at plausible heights all carry the object in the wrong direction, the explanation weakens. NOAA’s HYSPLIT documentation also shows why uncertainty matters: its trajectory ensemble option creates multiple paths by slightly offsetting the meteorological data, producing a spread of possible trajectories rather than a single perfect line. [ready.noaa.gov]ready.noaa.govRun HYSPLIT Trajectory ModelRun HYSPLIT Trajectory Model

Wind direction and speed

Channel: Met Office - UK Weather · Views: 699.5K · Uploaded: August 2014 · Length: 2 minutes 10 seconds

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Lanterns have a distinctive wind signature

Sky lanterns are a particularly common drifting-light explanation because they are bright, slow, silent and often released in groups. To a witness who does not see the launch, several lanterns can look like a formation of controlled lights. BBC Sky at Night Magazine notes that lanterns may be released together, can appear to fly in formation, and were widely linked with the surge in UK UFO reports around 2009. [Sky at Night Magazine]skyatnightmagazine.comSky at Night Magazine17 things commonly mistaken for UFOsSky at Night Magazine17 things commonly mistaken for UFOs

Their wind signature is usually low-level and short-lived. A lantern normally rises under hot air, drifts with the local wind, dims as fuel burns out and may vanish suddenly when the flame goes out or cloud intervenes. That pattern is quite different from an aircraft with navigation lights or a satellite moving on a predictable orbital track.

Wind data helps most when the sighting includes a path. A report of “orange balls moving from south-west to north-east for five minutes” can be checked against local wind observations. If the low-level wind came from the south-west and no aircraft or satellite explanation fits, lanterns become a strong candidate. If the lights moved steadily into a strong headwind at low altitude, lanterns become less likely.

There are also safety clues. Sky lanterns are not just visual curiosities; they are treated as fire and aviation hazards in many places. Delft University of Technology, discussing sky-lantern risk modelling, notes launch restrictions such as low wind force and distance from airports in a safety context. Saskatchewan’s government warned that sky lanterns had caused fires and that releasing many at once increased risk. Those public-safety concerns reinforce a practical investigative point: lantern releases tend to be associated with events, celebrations, fields, beaches and open spaces rather than random high-altitude flight paths. [TU Delft]tudelft.nlSource details in endnotes.

Remote Sensing: The Importance of Weather Balloons & Radiosondes

Channel: NWSBlacksburgVA · Views: 3.1K · Uploaded: December 2021 · Length: 4 minutes 29 seconds

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Weather balloons can look stranger than party balloons

Weather balloons and research balloons produce a different class of report. They can be large, high, bright in sunlight and visible from a long distance. They may look stationary when far away, then seem to move oddly as the observer’s perspective changes. At dusk or dawn, a balloon may remain sunlit while the ground is darker, making it stand out as a luminous object.

Upper-air observations are themselves created by balloon drift, which is why weather services have such detailed expertise in the subject. NOAA’s history of upper-air observations notes that early Weather Bureau stations tracked small free balloons with optical theodolites to obtain winds aloft, and that at night a small light was attached to the balloon to aid tracking. That detail is striking for UFO analysis: a light carried by a balloon is not an exotic possibility, but part of the historical method used to measure upper winds. [National Weather Service]weather.govSource details in endnotes.

Modern radiosonde data also shows why balloon drift is not a straight-line surface-wind problem. A global study of radiosonde balloon drift by Seidel and colleagues examined drift distance and ascent time using data from hundreds of stations. The fact that balloon drift is studied as a measurable climatological issue is important: balloons can travel far enough horizontally during ascent that their track must be considered when analysing atmospheric data, and the same physics applies when considering whether a reported object could have drifted across a witness’s view. [AGU Publications]agupubs.onlinelibrary.wiley.comAGU Publications Global radiosonde balloon drift statisticsAGU Publications Global radiosonde balloon drift statistics

Large research balloons can complicate matters further because they may remain at very high altitude and travel long distances. Project Blue Book material explicitly distinguished ordinary weather balloons from large research balloons, noting that some could be very large and that balloons were released from civilian, military, weather and research settings. [whs]esd.whs.milEnterprise Services Dashboard Project Blue BookEnterprise Services Dashboard Project Blue Book

Wind Data illustration 2

When wind data supports an IFO conclusion

Wind data is most persuasive when it matches the report in several independent ways. The best cases do not merely say “the wind was blowing that way”. They show that a passive object released from a plausible location, at a plausible time and height, would have crossed the witness’s line of sight at the right pace.

A strong balloon or lantern identification usually has these features:

  • Correct direction of drift. The object moves with the relevant wind layer, after converting wind direction correctly.
  • Plausible speed. The angular speed in the sky is consistent with a slow nearby lantern or a more distant balloon, rather than requiring impossible wind speeds.
  • Plausible altitude. The explanation does not depend on a lantern behaving like a high-altitude balloon, or a radiosonde staying near the ground.
  • Matching appearance. Orange flickering clusters suggest lanterns; reflective daylight spheres or white dots may suggest balloons; steady climb and eventual burst or disappearance may fit weather-balloon behaviour.
  • Event context. Nearby celebrations, known launches, weather stations, research activity or aviation notices can strengthen the case.

Official UAP work also shows that balloons remain a live explanation, not merely a historic one. AARO’s official imagery page lists multiple recent UAP reports resolved as balloons, and its case-resolution page includes the Al Taqaddum case, assessed with high confidence as a cluster of fully and partially inflated balloons that did not exhibit anomalous behaviour. [AARO]aaro.milOpen source on aaro.mil.

The U.S. Department of Defense has also said AARO has resolved hundreds of cases as commonplace objects including balloons, birds, drones, satellites and aircraft. Its 2024 consolidated annual report states that U.S. military assets in the Middle East provided 57 reports, of which 13 were resolved as balloons, uncrewed aircraft systems or satellites; many others lacked enough information for analysis. [U.S. Department of War]war.govdod examining unidentified anomalous phenomenadod examining unidentified anomalous phenomena

That last point is crucial. Wind data can support an identified flying object conclusion, but only when the original report contains enough geometry to test. A drifting explanation is much stronger when the observed motion, timing and appearance all point in the same direction.

Using weather balloons to collect weather data

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When wind data is not enough

Wind data can weaken a balloon or lantern explanation just as easily as it can support one. If a reported object holds position in strong winds at the relevant altitude, moves repeatedly against the wind, makes sharp powered turns, descends and climbs on command, or keeps station relative to another moving aircraft, passive drift becomes less plausible. But those conclusions require care, because the “relevant altitude” may be uncertain.

The biggest limitation is height. A witness often cannot tell whether a light is 200 metres away and low, or several kilometres away and high. Without range, size and altitude become guesses. A balloon carried by an upper wind may appear to cross the sky slowly, while a nearby lantern in light wind may seem to move similarly. The same angular motion can therefore have different physical explanations.

Weather data also has resolution limits. A surface station may be several kilometres away, a radiosonde launch may be hours apart, and local terrain can create small-scale winds that are not captured in broad model fields. NOAA’s HYSPLIT material reflects this uncertainty by offering ensemble trajectories, and National Weather Service material on HYSPLIT notes that trajectory products track an air parcel through the mean three-dimensional wind field, with turbulence not included in that simplified product. [ready.noaa.gov]ready.noaa.govOpen source on noaa.gov.

Another limitation is that wind matching cannot identify every drifting object. It may show that a report is consistent with a passive object, but not whether that object was a party balloon, weather balloon, plastic bag, lantern, foam debris, research payload or something else. For identification, wind data has to be combined with appearance, launch opportunities, altitude, duration and any independent records.

The most defensible use of wind evidence is therefore graded rather than absolute. If the reported light moved downwind, behaved like a buoyant object and had an appearance typical of a balloon or lantern, wind data can make an IFO explanation very strong. If the sighting lacks a reliable path or altitude, wind data can only suggest possibilities. If the object’s motion conflicts with winds at every plausible level, the drifting-object explanation should be treated as weak.

Wind Data illustration 3

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Endnotes

  1. Source: weather.metoffice.gov.uk
    Link: https://weather.metoffice.gov.uk/guides/observations/how-we-measure-wind
    Source snippet

    Met OfficeHow we measure windWind direction is measured by a vane consisting of a thin horizontal arm carrying a vertical flat plate at o...

  2. Source: metoffice.gov.uk
    Title: what is wind and how do we measure it
    Link: https://www.metoffice.gov.uk/blog/2025/what-is-wind-and-how-do-we-measure-it

  3. Source: weather.gov
    Link: https://www.weather.gov/hfo/windbarbinfo

  4. Source: weather.metoffice.gov.uk
    Link: https://weather.metoffice.gov.uk/learn-about/met-office-for-schools/other-content/other-resources/understanding-weather

  5. Source: noaa.gov
    Link: https://www.noaa.gov/jetstream/upperair/radiosondes

  6. Source: weather.gov
    Link: https://www.weather.gov/upperair/factsheet

  7. Source: esd.whs.mil
    Title: Enterprise Services Dashboard Project Blue Book
    Link: https://www.esd.whs.mil/Portals/54/Documents/FOID/Reading%20Room/UFOsandUAPs/proj_b1.pdf?ver=2017-05-22-113513-837

  8. Source: ncei.noaa.gov
    Title: NCEIIntegrated Global Radiosonde Archive (IGRA)
    Link: https://www.ncei.noaa.gov/products/weather-balloon/integrated-global-radiosonde-archive

  9. Source: arl.noaa.gov
    Title: Air Resources Laboratory HYSPLIT
    Link: https://www.arl.noaa.gov/hysplit/

  10. Source: ready.noaa.gov
    Title: Run HYSPLIT Trajectory Model
    Link: https://www.ready.noaa.gov/HYSPLIT_traj.php

  11. Source: ready.noaa.gov
    Link: https://www.ready.noaa.gov/hypub-bin/trajtype.pl

  12. Source: saskatchewan.ca
    Title: flying lanterns a fire risk
    Link: https://www.saskatchewan.ca/government/news-and-media/2010/june/30/flying-lanterns–a-fire-risk

  13. Source: weather.gov
    Link: https://www.weather.gov/upperair/reqdahdr

  14. Source: aaro.mil
    Link: https://www.aaro.mil/UAP-Cases/Official-UAP-Imagery/

  15. Source: aaro.mil
    Link: https://www.aaro.mil/UAP-Cases/UAP-Case-Resolution-Reports/

  16. Source: war.gov
    Title: dod examining unidentified anomalous phenomena
    Link: https://www.war.gov/News/News-Stories/Article/Article/3965403/dod-examining-unidentified-anomalous-phenomena/

  17. Source: media.defense.gov
    Title: FY24 CONSOLIDATED ANNUAL REPORT ON UAP 508
    Link: https://media.defense.gov/2024/Nov/14/2003583603/-1/-1/0/FY24-CONSOLIDATED-ANNUAL-REPORT-ON-UAP-508.PDF

  18. Source: weather.gov
    Link: https://www.weather.gov/media/fire/HYSPLIT_one_page.pdf

  19. Source: metoffice.gov.uk
    Link: https://www.metoffice.gov.uk/binaries/content/assets/metofficegovuk/pdf/research/library-and-archive/library/publications/factsheets/factsheet_13-upper-air-measurements_2023.pdf

  20. Source: metoffice.gov.uk
    Title: why do we measure wind at less than 500m
    Link: https://www.metoffice.gov.uk/blog/2025/why-do-we-measure-wind-at-less-than-500m

  21. Source: metoffice.gov.uk
    Title: world first data collected in innovative space weather project
    Link: https://www.metoffice.gov.uk/blog/2025/world-first-data-collected-in-innovative-space-weather-project

  22. Source: weather.gov
    Link: https://www.weather.gov/chs/upperair

  23. Source: weather.gov
    Title: KEY Weather Balloon Poster
    Link: https://www.weather.gov/media/key/KEY%20-%20Weather%20Balloon%20Poster.pdf

  24. Source: weather.gov
    Link: https://www.weather.gov/bgm/productUpperAir

  25. Source: forecast.weather.gov
    Link: https://forecast.weather.gov/glossary.php?word=wind

  26. Source: weather.gov
    Link: https://www.weather.gov/hnx/upperair

  27. Source: aoml.noaa.gov
    Title: upper air observations
    Link: https://www.aoml.noaa.gov/upper-air-observations/

  28. Source: ncei.noaa.gov
    Link: https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.ncdc%3AC00975

  29. Source: arl.noaa.gov
    Title: hysplit user guide
    Link: https://www.arl.noaa.gov/documents/reports/hysplit_user_guide.pdf

  30. Source: ready.noaa.gov
    Title: Cheat Sheet 2020
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  31. Source: ready.noaa.gov
    Link: https://www.ready.noaa.gov/HYSPLIT.php

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    Title: origin of wind
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  33. Source: aaro.mil
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  34. Source: nationalarchives.gov.uk
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    Title: ufo report 2008
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  37. Source: assets.publishing.service.gov.uk
    Title: ufo report 2009
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  38. Source: imdpune.gov.in
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  39. Source: windy.app
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  40. Source: catalog.data.gov
    Title: integrated global radiosonde archive igra version 1 superseded
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  41. Source: history.com
    Title: u s air force closes the book on ufos 45 years ago
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  42. Source: youtube.com
    Title: Using weather balloons to collect weather data
    Link: https://www.youtube.com/watch?v=rgZ5Ci-3g98
    Source snippet

    Radiosondes | National Oceanic and Atmospheric Administration - NOAA...

  43. Source: youtube.com
    Title: Radiosondes | National Oceanic and Atmospheric Administration
    Link: https://www.youtube.com/watch?v=aG9YgM47F5E
    Source snippet

    How weather balloons are launched...

  44. Source: community.wmo.int
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    Title: Sky at Night Magazine17 things commonly mistaken for UFOs
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  46. Source: tudelft.nl
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    Title: AGU Publications Global radiosonde balloon drift statistics
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  48. Source: Wikipedia
    Title: Weather balloon
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  49. Source: Wikipedia
    Link: https://en.wikipedia.org/wiki/HYSPLIT

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    Title: Project Blue Book
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  51. Source: docs.rocketpy.org
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  52. Source: mce2.org
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    Title: Project BLUE BOOK
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  54. Source: skyrora.com
    Title: weather balloons
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    Title: Sky Lanterns
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Additional References

  1. Source: youtube.com
    Title: Understanding upper-air wind data for forecasting
    Link: https://www.youtube.com/watch?v=8wK9DqjY0tU
    Source snippet

    These videos explain how atmospheric wind data, tracked via weather balloons and radiosondes, is used to model the movement of objects at...

  2. Source: cia.gov
    Link: https://www.cia.gov/readingroom/docs/CIA-RDP81R00560R000100040013-4.pdf

  3. Source: cia.gov
    Link: https://www.cia.gov/readingroom/document/cia-rdp81r00560r000100010001-0

  4. Source: facebook.com
    Link: https://www.facebook.com/kytxcbs19/posts/a-behind-the-scenes-look-at-the-nws-releasing-a-weather-balloon-to-figure-out-te/1376434954530545/

  5. Source: thenightly.com.au
    Link: https://thenightly.com.au/world/chinas-skies-erupt-blazing-fireball-loud-booms-fuel-ufo-and-space-test-speculation-c-20033978

  6. Source: facebook.com
    Link: https://www.facebook.com/funnyoldeworld/posts/debunked-this-ufo-is-a-hollywood-balloonufo-uap-debunked-factcheck/1490978935720145/

  7. Source: facebook.com
    Link: https://www.facebook.com/TxStormChasers/posts/meteorology-monday-describing-wind-directionin-meteorology-winds-are-described-b/1491307272653905/

  8. Source: facebook.com
    Link: https://www.facebook.com/JasonDunningWx/posts/did-you-see-this-a-high-altitude-stratospheric-balloon-was-spotted-floating-abov/1506804154148858/

  9. Source: bczernecki.github.io
    Link: https://bczernecki.github.io/thundeR/reference/get_sounding.html

  10. Source: facebook.com
    Link: https://www.facebook.com/HISTORY/posts/during-the-cold-war-as-project-blue-book-investigated-potential-ufo-threats-a-sh/1473622884330683/

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