Back in 2006, Japanese mass media began using the term “guerrilla rainstorm” to describe short localized downpours of over 100 mm of rain per hour that appeared suddenly and unexpectedly.
The phenomenon is thought to be a result of rapid development of cumulonimbus clouds near urban areas caused by a combination of heat islands and local winds. The rainstorms have proven incredibly difficult to predict (hence the name “guerilla”) and are known for causing flash floods in urban areas.
The photo you see above is of one such guerrilla rainstorm, taken from Tokyo Skytree on September 1.

Chinese Photoshop Trolls Part 3: This Time It’s Personal
Man’s job threatened over anonymous anime-related blog posts
The Starbucks tumbler limited to one place in the world: Haneda Airport
South Korean media alarmed as study shows 1 in 5 young people is NEET
Chinese Photoshop Trolling Part 2: Now with 20% More Shirtless Men!
Fashion Friends: Twitter Proves Almost Every Japanese College Student Wears the Same Exact Outfit
China’s Photoshop Experts Will Fix Your Bad Photos, But Be Careful What You Wish For
Oozing up From Below, Mysterious Marshmallow-like Substance Covers Nanjing Street
Disney Villains Clean Up Well, Wow Japan
Crime of Passion: Three Men Forcibly Deported from Saudi Arabia for Being “Too Handsome”
Real-Life Barbie Gives Her Friends and Family a Makeover, Turns Them into Dolls
We Made Coca-Cola Transparent and Colorless. It Tastes Like…
Peenzilla Worship! Japan’s Kanamara Festival Coming Up this April!
Chinese Woman on Trial for Killing Man by Squeezing His Scrotum
Chinese Student’s Bicycle Seat Breaks and… Gyah!
Before and After: 31 Startling Images of Plastic Surgery in Korea 【Photo Album】
China’s Photoshop Experts Will Fix Your Bad Photos, But Be Careful What You Wish For
Fashion Friends: Twitter Proves Almost Every Japanese College Student Wears the Same Exact Outfit
Pigs fly (in broth form) as ANA serves up in-flight Ippudo ramen
What Talent! One Student’s Amazing Short Animated Film Sets Internet Abuzz With Excitement 【Video】
Horrifying Hello Kitty soap dispenser makes every restroom visit a test of will
Japan’s abandoned bicycles find new homes in developing countries, helping save lives
Star Wars Characters Journey to the West as Classical Chinese Warriors
First Year Lolita Studies: Sewing, patterning, and cute!
Take a Ride on the Zoo Train Where the Seats Stare Back
Japanese woman found guilty of murder after refusing to accept welfare
Philip Kendall
Steven Simonitch
Master Blaster
Kay
Michelle Lynn Dinh
Jessica Ocheltree