Saturday, January 06, 2018

Posted Saturday Night:

On Saturday 6th Jan, Delhi NCR recorded this  season's lowest  temperatures. Lowest temperature of the season:- 
NewDelhi: 4.2°c, Modeltown(Rtk): 3.2°c, Gurgaon: 1.7°c
Chandigarh: 3.2°c, Rohtak: 3.7°c
Saturday also saw the maximum temperatures (Day Temperatures) dip in East U.P.....Gorakhpur 10.6°c ( -11c below normal), Bahraich: 11.6°c.

Table complied by Navdeep Dahiya:




Continuation of previous post on U.S....Some technical details..

The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite captured this image of the frozen Northeast landscape on December 28, 2017. Brisk northwesterly winds created rows of “cloud streets” as cold air blew over Lake Ontario and the Atlantic Ocean. A layer of snow covered much of New England and upstate New York.
Cloud streets are long parallel bands of cumulus clouds that form when cold air blows over warmer waters and a warmer air layer (temperature inversion) rests over the top of both. The comparatively warm water gives up heat and moisture to the cold air above, and columns of heated air called thermals naturally rise through the atmosphere. The temperature inversion acts like a lid. When the rising thermals hit it, they roll over and loop back on themselves, creating parallel cylinders of rotating air. As this happens, the moisture cools and condenses into flat-bottomed, fluffy-topped cumulus clouds that line up parallel to the direction of the prevailing winds.
While the cold streak has not broken all-time records, it is breaking records for individual days. On the day the image was acquired, weather observers on Mount Washington (New Hampshire) recorded a daily record low of -34 degrees Fahrenheit (-36° Celsius). Baltimore, Boston, Flint, New York, Montreal, and Toronto Cities have seen records fall during this cold snap.
The cold weather pattern has its origins in a large bulge, or ridge, in the jet stream that has brought unseasonably warm weather to Alaska. On the east side of this ridge, a trough in the jet stream plunged southward, bringing plenty of Arctic air with it. This orientation of the jet stream, which looks similar to the greek letter omega, is known as an omega block.(See Article on 200 Jet Streams..Explained there).
NASA image by Jeff Schmaltz, LANCE/EOSDIS Rapid Response. Story by Adam Voiland. From Earth Obervatory NASA.

2 comments:

sset said...

US NE "bomb cyclone" 600mm of snow in 24hrs! Just like Jan 2017, Jan 2016 was also freezing extreme cold. Mumbai is also cold, last year Jan 2016 was similarly cold.

sset said...

It is strange entire US freezes with massive snow blizzards, Russia is still waiting for proper winter to start with snow! Huge climate change?

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