Tan saw these iridescent clouds on two evenings recently.

On Saturday, Mar. 25 at around 5.30pm in Kallang:

and on Monday, Mar. 27 at around 6.30pm in Pasir Ris:

Some others also noticed the iridescent clouds on Saturday afternoon.

At Pasir Ris Park:

? It was awesome! ? We went Scouting with children and had a 5-km hike cum park-and-estate cleanup. We were exhausted. As we were resting, lifted up our eyes we saw the Fire Rainbow. So very happy and all the tiredness dissipated. Thank God! Fire rainbow was sighted at 4:50pm, 25-3-2017, Sat, near Pasir Ris Park . “And He who sat there was like a jasper and a sardius stone in appearance; and there was a rainbow around the throne, in appearance like an emerald . ““And behold, I am coming quickly, and My reward is with Me, to give to every one according to his work. I am the Alpha and the Omega, the Beginning and the End, the First and the Last.”” ‭‭ [Revelation‬ ‭4:3‬ ; ‭22:12-13‬ ‭NKJV] . . For SUNDAY, 26 March 2017. Have an amazing week ahead, everyone! ▫️▫️▫️▫️▫️▫️▫️▫️▫️▫️▫️▫️▫️ #majestic #ItsABeautifulDay #skyview #sky_perfection #livecolourfully #firerainbow #sky_lovers #AlphaAndOmega

A post shared by Nature's Glory™ 天榮™ (@naturesglorysg) on Mar 25, 2017 at 10:16am PDT

In Tampines:

Captured these beautiful phenomenon multi-coloured glow lit up parts of the skies opposite Century Square after my afternoon's workout #bodybalance #shbam at #fitnessfirst #tampines. Not sure it is a "fire rainbow" or a "circumhorizontal arc". Still, iridescent clouds can be considered a rare sight in Singapore. #firerainbow #circumhorizontalarc #beautiful #diffractedvisions #iridescent #cumulus #cloud #phenomenon #atmospheric #refraction #opticalillusion #cottonballshape #gorgeous #raresight #geographic #equator #singapore

A post shared by @lynyenna on Mar 25, 2017 at 2:51am PDT

And also in Changi:

A fire rainbow over Changi sky in Singapore. This is happening now!! #instamoment #igsg #insingapore #sundown #reflections #eveningsky #昔日#alwaysreadytotakepic #exploringsg #skylover #singaporesky #sunray #igcapture #igで繋がる空 #natureart #snapseed #igsger #naturebeauty #usingiphone #iphonography #光 #夕阳 #夕日 #alwayslookingforphotoworthymoment #firerainbow #iphoneonly #? #rainbow #nofilter

A post shared by Triple C (@3niner) on Mar 25, 2017 at 2:17am PDT

Perhaps the unicorns decided to take a dump in the Eastern side of Singapore while traipsing across the country's skies.

Please also come to the Wrest? :D

Top photo courtesy of Tan Yong Lin

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Did you see the sky at about 5pm? You might’ve seen a splotch of rainbow behind a cloud

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