Within First Checks
Did the weather make it look strange?
Cloud, haze, fog, wind and visibility records can change a UFO report from unexplained to ordinary atmosphere plus ordinary light.
On this page
- What weather records add to a sighting
- Cloud, fog, haze and visibility effects
- Wind clues for balloons and drifting objects
Page outline Jump by section
Introduction
Weather records are one of the most useful tools for testing whether an unusual light was genuinely unexplained or simply an ordinary object seen under unusual atmospheric conditions. Before a sighting is treated as anomalous, investigators compare the witness account with contemporaneous weather observations, visibility measurements, cloud reports and wind data. These records can reveal that a light was distorted by haze, hidden by cloud, reflected by moisture, or drifting exactly as the winds would predict. In many historical investigations, including those conducted under Project Blue Book, weather information helped move reports from “mystery” to “identified” without dismissing the witness’s experience. [Defense Logistics Agency]esd.whs.milDefense Logistics Agency Project Blue BookSeveral tbousand balloons are released each day from military and civilian airports, weather stations, and research…Read more… [Wikimedia]upload.wikimedia.orgIn this type of report, the times are checked. All weather balloons in the United…Read more…
Did the weather make it look strange?
A witness sees only the sky from one location and one moment. Weather records provide a broader picture of what the atmosphere was doing across the area.
The most useful records include:
- Surface observations showing visibility, fog, mist and haze.
- Cloud cover and cloud-base height reports.
- Wind speed and direction at ground level and at higher altitudes.
- Precipitation records.
- Temperature and humidity measurements.
- Aviation weather reports such as METAR observations and forecasts. [Skybrary]skybrary.aeroSkybraryMeteorological Aerodrome Report (METAR)A format for reporting weather information. The World Meteorological Organisation (WMO) de… [National Weather Service]weather.govThe METAR acronym roughly translates from the French as…Read more…
These datasets matter because the atmosphere is not a transparent window. Light can be scattered, dimmed, magnified, blurred or partially hidden. A bright aircraft, planet, helicopter or balloon may therefore appear to change shape, colour or motion even when the object itself behaves normally.
What weather records add to a sighting
A common mistake is to evaluate a witness description without checking how far visibility extended that night. If visibility was severely reduced, distance estimates become unreliable. Objects can appear closer, larger or more mysterious because the usual visual references are missing.
Meteorological agencies define visibility carefully because fog, haze and suspended particles can dramatically alter perception. Aviation weather guidance notes that fog, haze, smoke, precipitation and other obscuring phenomena reduce visibility and affect how lights are seen at a distance. [Aviation Weather Center]aviationweather.govAviation Weather CenterCEILINGS & VISIBILITYReductions in ceiling heights and visibility may be caused by fog, mist, haze, smoke, precipi… [Federal Aviation Administration]WikipediaFederal Aviation AdministrationThe Federal Aviation Administration (FAA) is a US federal government agency within the US Department of…
For investigators, weather records can answer practical questions:
- Could the witness have seen an aircraft at the reported distance?
- Were stars or planets intermittently hidden by cloud?
- Would atmospheric scattering have made a bright light appear larger?
- Was visibility so poor that estimating altitude became difficult?
- Were conditions suitable for reflections or optical distortions?
The value of these checks is that they test specific claims against recorded environmental conditions rather than relying solely on memory.
Cloud, fog, haze and visibility effects
When clouds hide part of the picture
Cloud layers can create the illusion that a light suddenly appeared, vanished or changed direction. An aircraft entering a cloud bank may seem to blink out instantly. A bright light emerging from broken cloud can appear to accelerate because the observer only sees part of its path.
Low cloud also removes background stars, making a familiar aircraft light appear isolated and unusual. At night, cloud bases can reflect urban lighting, creating glowing patches that seem detached from the ground.
Fog and mist
Fog is essentially a cloud at ground level. Meteorological definitions classify fog as a condition where visibility is reduced below approximately one kilometre. [Met Office]metoffice.gov.ukMet OfficeMist, fog, and haze: What's the difference?10 Sept 2025 — Fog is essentially a cloud at ground level that causes a reduction in…
In foggy conditions:
- Bright lights develop halos.
- Point sources can appear larger than they really are.
- Colours may shift toward red or orange.
- Apparent movement can be exaggerated as visibility changes.
A distant aircraft light shining through varying fog density may seem to pulse or fluctuate even though the light output remains constant.
Haze and airborne particles
Haze is especially important in reports of unusual lights. Aviation weather guidance notes that haze consists of particles suspended in the atmosphere that scatter light and reduce visibility. [Universal Weather and Aviation]universalweather.comaviation weather tips visibilityHaze is usually formed by presence of…Read more…
This scattering can:
- Blur the edges of bright objects.
- Create glowing discs around lights.
- Make stars or planets appear larger.
- Cause apparent colour changes near the horizon.
Many reports of stationary glowing objects become less puzzling when weather records show significant haze combined with a bright astronomical object or aircraft in the relevant direction.
Wind clues for balloons and drifting objects
Wind data are often among the most decisive pieces of evidence.
A witness may report an object hovering, drifting slowly or moving silently across the sky. The question then becomes whether its movement matches the atmosphere itself.
Project Blue Book investigators routinely compared reported motion with winds aloft. Historical Blue Book procedures specifically noted that suspected balloon reports were checked against known launch times and upper-air wind directions. If the object’s track matched the recorded winds, a balloon explanation became much more likely. [Wikimedia Commons]upload.wikimedia.orgIn this type of report, the times are checked. All weather balloons in the United…Read more…
This approach remains useful today because wind conditions vary significantly with altitude. An object can appear to move against the surface wind while actually following stronger winds higher up.
Weather records therefore allow investigators to test whether:
- A weather balloon could have travelled through the reported area.
- A drifting illuminated balloon matches the observed speed and direction.
- A sky lantern followed the prevailing wind.
- A floating object’s path was consistent with atmospheric flow.
The comparison is objective. Either the recorded winds support the reported movement or they do not.
A practical weather-check workflow
When evaluating an unusual-light report, investigators typically begin with the exact time and location, then retrieve weather observations from the nearest reporting station.
A useful sequence is:
- Confirm visibility conditions at the time of the sighting.
- Check cloud cover and cloud-base height.
- Review fog, mist, haze or precipitation reports.
- Examine surface winds and winds aloft.
- Compare the reported motion with recorded wind directions.
- Consider whether atmospheric conditions could alter the appearance of known lights.
Aviation weather reports are especially valuable because they provide standardised observations of visibility, cloud layers and atmospheric conditions recorded close to the time of the event. [Skybrary]skybrary.aeroSkybraryMeteorological Aerodrome Report (METAR)A format for reporting weather information. The World Meteorological Organisation (WMO) de… [National Weather Service]weather.govThe METAR acronym roughly translates from the French as…Read more…
Why weather evidence often changes the verdict
Weather records do not automatically explain every sighting, but they frequently transform how a report is interpreted. A light that seemed to hover may have been drifting with upper-level winds. A glowing orb may have been a normal light enlarged by fog or haze. An apparent disappearance may coincide with cloud cover rather than extraordinary behaviour.
For this reason, weather data are not an optional extra in UFO investigations. They are a core evidential check. Before a sighting is labelled anomalous, investigators need to know not only what was in the sky, but also what the atmosphere was doing to the view. [Met Office]metoffice.gov.ukMet OfficeMist, fog, and haze: What's the difference?10 Sept 2025 — Fog is essentially a cloud at ground level that causes a reduction in… [Wikimedia Commons]upload.wikimedia.orgIn this type of report, the times are checked. All weather balloons in the United…Read more…[Defense Logistics Agency]esd.whs.milDefense Logistics Agency Project Blue BookSeveral tbousand balloons are released each day from military and civilian airports, weather stations, and research…Read more…
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Endnotes
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Source: upload.wikimedia.org
Link: https://upload.wikimedia.org/wikipedia/commons/5/5c/Project_Blue_Book%2C_BBA-PBSR8-300.pdfSource snippet
In this type of report, the times are checked. All weather balloons in the United...Read more...
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Source: skybrary.aero
Link: https://skybrary.aero/articles/meteorological-aerodrome-report-metarSource snippet
SkybraryMeteorological Aerodrome Report (METAR)A format for reporting weather information. The World Meteorological Organisation (WMO) de...
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Source: weather.gov
Link: https://www.weather.gov/media/surface/SFCTraining.pdfSource snippet
The METAR acronym roughly translates from the French as...Read more...
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Source: weather.gov
Link: https://www.weather.gov/media/surface/WSOH8.pdfSource snippet
AVIATION WEATHER OBSERVATIONS for Supplementary...Dark or nearly dark objects viewed against the horizon sky during the day, or unfocuse...
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Source: esd.whs.mil
Title: Defense Logistics Agency Project Blue Book
Link: https://www.esd.whs.mil/Portals/54/Documents/FOID/Reading%20Room/UFOsandUAPs/proj_b1.pdf?ver=2017-05-22-113513-837Source snippet
Several tbousand balloons are released each day from military and civilian airports, weather stations, and research...Read more...
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Source: aviationweather.gov
Link: https://aviationweather.gov/outreach/AWC%20CV%20Flyer.pdfSource snippet
Aviation Weather CenterCEILINGS & VISIBILITYReductions in ceiling heights and visibility may be caused by fog, mist, haze, smoke, precipi...
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Source: faa.gov
Title: FAA H 8083 28A FAA Web
Link: https://www.faa.gov/sites/faa.gov/files/FAA-H-8083-28A_FAA_Web.pdfSource snippet
Federal Aviation AdministrationAviation Weather Handbook 202426 Nov 2024 — A haze layer has a definite ceiling above which in-flight (air...
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Source: metoffice.gov.uk
Link: https://www.metoffice.gov.uk/blog/2025/whats-the-difference-between-mist-fog-and-hazeSource snippet
Met OfficeMist, fog, and haze: What's the difference?10 Sept 2025 — Fog is essentially a cloud at ground level that causes a reduction in...
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Source: community.wmo.int
Title: World Meteorological Organization Aviation
Link: https://community.wmo.int/site/knowledge-hub/programmes-and-initiatives/aviation/aviation-hazards-low-visibility-and-low-cloudSource snippet
Only the most sophisticated of aircraft (Civil Airliners/military aircraft)...Read more...
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Source: universalweather.com
Title: aviation weather tips visibility
Link: https://www.universalweather.com/blog/aviation-weather-tips-visibility/Source snippet
Haze is usually formed by presence of...Read more...
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Source: faa.gov
Title: Federal Aviation Administration Chapter 7
Link: https://www.faa.gov/air_traffic/publications/atpubs/aim_html/chap7_section_1.htmlSource snippet
Chapter 7. Safety of FlightThe following are examples of aviation forecasts depicted on the GFA: Terminal Aerodrome Forecast (TAF); Ceili...
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Source: reddit.com
Title: Project Blue Book
Link: https://www.reddit.com/r/UFOs/comments/193heyd/project_blue_book_flying_jellyfish_1954_labrador/Source snippet
UFO reports all being [hoaxes]({{ 'hoaxes/' | relative_url }}) or misidentifications. And hell, even... Well skyhook balloons had acoustic sensors in 40s if I'm not mistaken...
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Source: Wikipedia
Title: Federal Aviation Administration
Link: https://en.wikipedia.org/wiki/Federal_Aviation_AdministrationSource snippet
Federal Aviation AdministrationThe Federal Aviation Administration (FAA) is a US federal government agency within the US Department of...
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Source: Wikipedia
Title: Project Blue Book
Link: https://en.wikipedia.org/wiki/Project_Blue_BookSource snippet
Project Blue BookProject Blue Book was the code name for the systematic study of unidentified flying objects (UFOs) by the United Stat...
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Source: faa.gov
Link: https://www.faa.gov/ -
Source: archives.gov
Title: Project BLUE BOOK
Link: https://www.archives.gov/research/military/air-force/ufosSource snippet
The project closed in 1969 and we have no...Read more...
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Source: dictionary.cambridge.org
Link: https://dictionary.cambridge.org/dictionary/english/projectSource snippet
| English meaning - Cambridge Dictionarya piece of planned work or an activity which is done over a period of time and intended to achiev...
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Source: aviationweather.gov
Link: https://aviationweather.gov/gfa/ -
Source: britannica.com
Title: Project Blue Book
Link: https://www.britannica.com/topic/Project-Blue-BookSource snippet
Definition, History, Aliens, UFOs, & Facts16 May 2026 — Project Blue Book, code name for the United States' longest-running Air Force pro...
Published: May 2026
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Source: youtube.com
Link: https://www.youtube.com/user/FAAnewsSource snippet
Federal Aviation AdministrationWelcome to the official YouTube channel of the Federal Aviation Administration (FAA). Our mission is simpl...
Additional References
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Source: cia.gov
Link: https://www.cia.gov/readingroom/docs/CIA-RDP81R00560R000100040013-4.pdfSource snippet
FACT SHEET AIR FORCE UFO REPORTThere are. Approximately 4,000 balloons are released in the U. S. every day. two general types of balloons...
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Source: faa.gov
Link: https://www.faa.gov/air_traffic/publications/atpubs/fs_html/chap2_section_4.htmlSource snippet
Section 4. Weather PhraseologyUse the following phraseology and procedures for stating surface weather observations and for information s...
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Source: medium.com
Link: https://medium.com/faa/a-fresh-forecast-ec83e1b565a9Source snippet
A Fresh Forecast. Aviation Weather Under the MicroscopeWhen a METAR is labeled as a SPECI, [pilots]({{ 'pilots/' | relative_url }}) should take note that the winds, visibi...
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Source: etlaviation.com
Link: https://www.etlaviation.com/wp-content/uploads/_resources/FAA_Aviation_Weather_for_Pilots_and_Flight_Operations_Personnel_AC_00_6A_1975.pdfSource snippet
FAA_Aviation_Weather_for_Pilot...with a ceiling light to determine cloud height at night. cloud bank-Generally, a fairly well-defined mas...
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Source: cfinotebook.net
Link: https://www.cfinotebook.net/notebook/weather-and-atmosphere/obstructions-to-visibilitySource snippet
Obstructions To VisibilityUnderstanding obstructions to visibility helps pilots recognize how phenomena such as fog, haze, smoke, and pre...
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Source: merriam-webster.com
Link: https://www.merriam-webster.com/dictionary/projectSource snippet
PROJECT Definition & Meaning1. a: to devise in the mind: design b: to plan, figure, or estimate for the future 2. to throw or cast for...
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Source: flyhpa.com
Link: https://www.flyhpa.com/2012/02/the-art-of-flying-at-night/Source snippet
The Art of Flying at NightIn some places, you'll have haze that sticks around after dark, but otherwise, as long as there aren't low clou...
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Source: af.mil
Link: https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104590/unidentified-flying-objects-and-air-force-project-blue-book/Source snippet
Unidentified Flying Objects and Air Force Project Blue BookWith the termination of Project Blue Book, the Air Force regulation establishi...
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Source: medium.com
Link: https://medium.com/%40pavpanda/ufo-sightings-around-the-world-through-the-eyes-of-data-4e7c34412080Source snippet
The world may never know. But what the world does know is that people often mistake UFOs for more common entities...Read more...
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Source: prologue.blogs.archives.gov
Title: saucers over washington the history of project blue book
Link: https://prologue.blogs.archives.gov/2019/12/19/saucers-over-washington-the-history-of-project-blue-book/Source snippet
Pieces of HistorySaucers Over Washington: the History of Project Blue Book19 Dec 2019 — Upon further inspection, the majority of these re...
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