Rainbows Vs Storms

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lightning_forking_across_the_sky_above_a_rainbowPhoto:
Photo via Tony Rogers

Rainbows and powerful storms are the Yin and Yang of meteorological phenomena. Colourful yet ethereal, the former often appear as archways into other worlds in popular mythology. Dorothy in The Wizard of Oz wasn’t the first to dream of a better life somewhere over the rainbow; neither was she the first to get swept up in the violent thrall of a sudden tornado.

Double_Rainbow_with_LightningPhoto:
Photo: tenfrozentoes

Storms naturally come in various guises, with those that generate lightning also proving particularly devastating. Put storms and rainbows together and you get a battle of diametrically opposing forces, one active, aggressive, destructive, the other the reverse of such descriptions, and yet both in their own ways utterly spectacular.

Clashing forces: Tornado and rainbow over Kansas, 2006
Tornado_and_Rainbow_Over_KansasPhoto:
Photo: Eric Nguyen via NASA

Tornadoes are the most violent storms known to man. The sight of a funnel-shaped cyclone is enough to strike fear into the heart in hotspots like the USA’s notorious tornado alley. The scene above might be deemed serene if it weren’t for the tornado. Storm chaser Eric Nguyen, who sadly passed away in 2007, snapped the emerging twister in a different light – the light of a rainbow. A white tornado cloud descends from a dark storm cloud and by coincidence appears to end right over a rainbow.

Stuff of myth: Gateway to Oz, Kansas, 2004
Gateway_to_Oz_Tornado_near_Mulvane,_KS,_6/12/2004Photo:
Photo: busychild424

Storms are by their definition strongly suggestive of severe weather. Even without a dangerous, rotating column of air capable of ripping buildings off their very foundations, fierce winds, thunder and lightning are par for the course. Now while rainbows appear an altogether more tranquil proposition, they’re the product of sunlight reflected off water droplets in the air – so it’s not inconceivable that with a dribble of sunshine, a rainbow should grace the otherwise storm-bitten sky.

Tripple trouble? Lightning and double rainbow, Norway, 2008
lightning_and_double_rainbowPhoto:
Photo: only me

What makes the simultaneous appearance of lightning and rainbows rare is that while lightning often occurs during heavy storms, rainbows tend to form after the rain has stopped. Generally, storms rear their head when a centre of low pressure develops with a surrounding system of high pressure. Yet small, localised areas of low pressure can also form from hot air rising off hot ground, resulting in smaller disturbances like dust devils and whirlwinds – which can be vicious too.

Whirlwind romance: Otago, New Zealand, 2009
Whirlygog_whirlwind tearing_across_the_valley_with_rainbow_overheadPhoto:
Photo: Nonac Digi

Photographer Nonac Digi had the following to say about the shot above: “[I was] driving today when I looked to my left to see the roof of a barn lifted bodily from its walls and unceremoniously dumped some 10m away, then noticed this whirlwind tearing across the valley. Awesome! Parked the truck, grabbed the camera and shot away…” Surely he noticed the faint rainbow arcing over the vortex of wind too, right? In any case, trying to outrun a tornado while driving is ill advised.

Bolt vs bow: Lightning with rainbow, New Mexico, 2005
Blanco_Lightning_with_Rainbow_24_Jul_2005Photo:
Photo: Orlon Meeks via NOAA

Strong thunderstorms are those most likely to produce tornadoes – as well as other severe weather like hailstones and flash flooding – but lightning is of course part of the package with any electric storm. The flash or streak from the sky is thought by some scientists to result from particles from the sun given off in solar wind that gather in the outer layers of the atmosphere, then build up electrical charge in clouds. Powerful positive lightning is of particularly grave danger for airplanes.

Devil’s Tower monument, Wyoming, 1982
wwwPhoto:
Photo: Barbara Hansen

Says photographer Barbara Hansen of the shot above: “We were camped and a storm came in with lots of thunder and lightning. Part of the sky cleared to reveal a rainbow, while there were still random bolts of lightning being created”. It’s a good job the lightning didn’t choose to strike any of the trees nearby, as they are natural lightning conductors, prone to exploding when struck due to their sap super-heating into steam and blowing off bark beyond the lightning’s path.

Lightning strike: Nanaimo, Canada, 2009
lightning_and_rainbow_nanaimoPhoto:
Photo: cleverocity

Like the tornadoes that may accompany them, thunderstorms are the subject of scrutiny by storm spotters across the US trained by the National Weather Service to report on severe conditions. While keeping a weather eye out for such potentially hazardous meteorological events, it must come as a strange yet welcome relief to one day observe a rainbow adding its peaceful light to the shade of a storm.

Sources: 1, 2, 3, 4, 5, 6

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