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WTF, Weather?

Originally published on onearth.org here.

The “polar vortex” that froze North America in its tracks this week isn’t exactly new. Cyclones of frigid air swirl around the Arctic all the time. What’s different is that this latest polar vortex dipped far enough south to send Floridians scrambling for their mittens. The term also showed up all over my Facebook feed. Granted, I run with a lot of science journalists, but this time even my let’s-take-a-picture-of-my-breakfast friends (no offense, guys) were discussing the rare and strange interaction of the polar vortex with the jet stream and its possible relation to melting Arctic sea ice … driven by climate change.

Thanks to wacky weather (and social media hashtags), meteorology geekspeak has hit the mainstream. Once obscure atmospheric patterns are now thrown into everyday conversations with only the slightest hesitation to make sure “derecho” is pronounced correctly. As global warming (“global weirding,” anyone?) primes the planet for even more extreme weather, expect to encounter more lab coat lingo and science slang in your everyday life. Here’s a crib sheet for the climapocalypse.

BLOCKING PATTERN

http://cimss.ssec.wisc.edu/goes/blog/wp-content/uploads/2013/09/NA_Water_Vapor_20130912loop.gif

Wow, that jet stream sure is curvy—possibly as a result of a warming Arctic—but don't let its good looks fool you. During a blocking pattern, the jet stream is slow, boring, and prevents other weather patterns from getting on with their lives. So when it rains, it pours … for days, as it did in Colorado last September.


DERECHO

dercho

If you pronounce this one right on your first try, those High School Spanish classes are paying off. “Derecho” means “straight,” as in a straight line of fast-moving thunderstorms that is beautifully terrifying (like the one pictured above in Chicago in June 2012). That devastating derecho left 23 people dead and more than 4 million people without electricity between Illinois and Washington, DC. Derechos are also known as "land hurricanes."


FIRENADO/FIREWHIRL

When convection heat rises off a wildfire and begins sucking and swirling in towers of flames, a “fire tornado” can occur. The above fire devil formed in Australia in 2012, and this huge one occurred last August during Alaska's Tetlin Junction Fire.

 

FLASH FREEZE

Frozen chicago

Somebody get Lake Michigan a hot toddy. During this week's polar vortex, when temperatures dropped as much as 50 degrees in a matter of hours , cities from Ontario to northern Georgia issued flash freeze warnings.


FROST QUAKE

Sugary breakfast cereal? Nope. Also known as cryoseisms, these usually innocuous "ice quakes" occur when water penetrates soil or rock formations, freezes, and then rapidly expands, as it did in Canada this week. Pressure builds up underground and then ... BOOM!


HABOOB

Haboob is a Sudanese word for sandstorm, but could be an American word for "go inside right now!" Haboobs are dry microbursts that occur during drought conditions and bring a wall of dirt, dust, and sand with them. The above haboob was 100 miles long and hit Phoenix at 60 mph.


HEAT BURST

Did you know it can actually rain heat? When a mass of dry air plummets toward the ground during a weakening thunderstorm and compresses, a sudden, dramatic increase in temperature can occur—along with some very strong, hot winds. During a 2011 heat burst in Wichita, Kansas, the mercury rose from 85 to 102 degrees in 20 minutes.


MEGAFIRE

Exactly what it sounds like: a massive wildfire. Drought conditions due to global warming are making them more common across the globe.

SNOW DROUGHT

A ski resort’s worst nightmare, when a lack of precipitation during winter months shrinks the snowpack and makes skiers and snowboarders cry into their cocoa. It’s not fun for farmers, either. Less snow in winter means less meltwater for agriculture and aquifers come spring.

 

POLAR VORTEX

Polar Vortex

After this week's #DeepFreeze media blast, you should be a pro on polar vortices by now. If not, click here.


BONUS POINTS: ICE BALLS



Lake Michigan gets ready for a snowball fight. (Watchu packn', Lake Superior?)

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