CORROBORATED
CF-GEI-19780500521 CORROBORATED

The Bagnères-de-Bigorre Lenticular Cloud Phenomenon

CASE FILE — CF-GEI-19780500521 — CASEFILES CLASSIFIED ARCHIVE
Date Date when the incident was reported or occurred
1978-05-28
Location Reported location of the sighting or event
Bagnères-de-Bigorre, Hautes-Pyrénées, France
Duration Estimated duration of the observed phenomenon
6 to 10 minutes
Object Type Classification of the observed object based on witness descriptions
light
Source Origin database or archive this case was sourced from
geipan
Witnesses Number of known witnesses who reported the event
1
Country Country where the incident took place
FR
AI Confidence AI-generated credibility score based on source reliability, detail consistency, and corroboration
85%
On May 28, 1978, at approximately 9:00 AM in Bagnères-de-Bigorre, located in the Hautes-Pyrénées department of southwestern France, a single witness observed an unusual atmospheric phenomenon in the direction of the rising sun. The witness reported seeing 'an ensemble of halos of different colors from which luminous rays seemed to emanate.' The phenomenon remained visible for between 6 to 10 minutes before disappearing completely. The sighting occurred in a mountainous region of the Pyrenees, an area known for distinctive meteorological conditions. No other witnesses came forward to corroborate the observation despite the phenomenon's duration and the morning hour when people would likely be active. GEIPAN, France's official UAP investigation service under CNES (Centre National d'Études Spatiales), investigated this case and assigned it a Classification B rating. GEIPAN's investigation concluded that the witness most likely observed a lenticular cloud formation. These lens-shaped clouds commonly form in mountainous regions when stable, moist air flows over elevated terrain. When positioned near the sun, lenticular clouds can create spectacular optical effects including colored halos and apparent light rays through atmospheric refraction and diffraction, matching the witness's description precisely.
02 Timeline of Events
09:00
Initial Observation
Witness observes unusual phenomenon in the direction of the rising sun - multiple colored halos with apparent luminous rays emanating from them.
09:00-09:10
Sustained Viewing
Phenomenon remains visible and stable for an estimated 6 to 10 minutes, allowing extended observation of the colored halos and light rays.
09:06-09:10
Phenomenon Disappears
The atmospheric display completely vanishes, likely as the lenticular cloud formation dissipates or moves out of alignment with the sun.
Post-event
GEIPAN Investigation
French space agency GEIPAN investigates the report. No additional witnesses located despite the morning timing and duration of the event.
Post-event
Classification B Assigned
GEIPAN concludes the witness probably observed a lenticular cloud, assigning Classification B (probable explanation with good likelihood).
03 Key Witnesses
Anonymous Witness 1
Civilian
unknown
Single witness who observed the phenomenon in the morning hours while facing east toward the rising sun. No additional background information available from GEIPAN files.
"An ensemble of halos of different colors from which luminous rays seemed to emanate."
04 Analyst Notes -- AI Processed
This case represents a textbook example of a meteorological phenomenon misidentified as anomalous. The witness credibility cannot be fully assessed due to anonymity, but the description aligns perfectly with known lenticular cloud behavior. The Hautes-Pyrénées location is particularly significant - Bagnères-de-Bigorre sits at the foot of the Pyrenees mountains at approximately 550 meters elevation, creating ideal conditions for lenticular cloud formation when westerly winds cross the mountain range. The timing (9:00 AM, facing the rising sun) is crucial to understanding the visual effects reported. Solar position would create optimal conditions for observing optical phenomena through cloud formations, including the colored halos (likely caused by ice crystal refraction) and apparent light rays (crepuscular rays filtered through cloud layers). The absence of corroborating witnesses is notable but not unusual for a morning sighting in a small town, and the relatively short duration (6-10 minutes) is consistent with transient cloud formations. GEIPAN's B classification indicates a 'probable explanation' with good likelihood, which appears well-justified given the environmental factors and phenomenon description.
05 Theory Comparison
BELIEVER ANALYSIS
SKEPTIC ANALYSIS
Ice Crystal Halo Display
The phenomenon could be a more general atmospheric optics event - a solar halo display caused by ice crystals in cirrus clouds at high altitude. The 'ensemble of halos of different colors' suggests a complex halo phenomenon possibly including a 22-degree halo, parhelia (sundogs), or circumzenithal arc. These create vivid colored rings and arcs around the sun with apparent radiating light beams. This explanation doesn't require lenticular clouds specifically, though they often accompany such displays in mountainous areas.
06 Verdict
ANALYST VERDICT
This case is almost certainly explained as a lenticular cloud with associated optical effects. The confidence level is high based on: (1) the geographic location in a prime lenticular cloud zone, (2) the perfect match between witness description and known atmospheric optical phenomena, (3) GEIPAN's professional assessment, and (4) the timing relative to sunrise creating optimal conditions for solar refraction effects. This sighting has minimal significance for UAP research but serves as a valuable example of how extraordinary atmospheric conditions can create unusual visual displays. The case illustrates why environmental and meteorological analysis is essential in UAP investigations, particularly in mountainous regions where lenticular clouds frequently occur.
AI CONFIDENCE SCORE:
85%
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