Extreme weather

Discussion in 'SHH Community Forum' started by :eek:, Mar 20, 2013.

  1. :eek: Registered

    Joined:
    Nov 29, 2009
    Messages:
    7,715
    Likes Received:
    1,104
    Punxatawney Phil got it way wrong. Pennsylvania's famous prognosticating rodent predicted just three more weeks of winter back on February 2. It's the first day of spring, but winter remains firmly entrenched over the eastern half of the U.S., where temperatures of 5 - 25°F below average have been the rule all week. The culprit is the jet stream, which has taken on an unusually contorted shape that is allowing cold air to spill down over the Eastern U.S. and Western Europe, but bringing near-record warmth to portions of Greenland. One measure of how contorted the jet stream has become is by measuring the difference in pressure between the Icelandic Low and the Azores High. There are two indices used to do this--one called the Arctic Oscillation (AO), which treats the flow over the entire Northern Hemisphere, and another called the North Atlantic Oscillation (NAO), which is more focused on the North Atlantic. The two are closely related about 90% of the time. When these indices are strongly negative, the pressure difference between the Icelandic Low and the Azores High is low. This results in a weaker jet stream, allowing it to take large, meandering loops, letting cold air to spill far to the south from the Arctic into the mid-latitudes. The AO index hit -5.2 today (March 20). This is the second most extreme March value of the index since record keeping began in 1948; only an AO value of -6.3 in March 1970 was more extreme. We've had some wildly variable jet stream patterns in recent years in the Northern Hemisphere. Just last year, we had the opposite extreme in March, when our ridiculous "Summer in March" heat wave brought a week of temperatures in the 80s to the Midwest U.S. The first day of spring today in Chicago, IL is expected to have a high temperature of just 25°F--a 60 degree difference from last year's high of 85°F on March 20!


    Unusual winter jet stream patterns tied to Arctic sea ice loss
    Unusual jet stream contortions in winter have become increasingly common in recent years, according to a March 2013 paper by Tang et al., "Cold winter extremes in northern continents linked to Arctic sea ice loss". They found a mathematical relationship between wintertime Arctic sea ice loss and the increase in unusual jet stream patterns capable of bringing cold, snowy weather to the Eastern U.S., Western Europe, and East Asia, typical of what one sees during a strongly negative Arctic Oscillation. They theorized that sea ice loss in the Arctic promotes more evaporation, resulting in earlier snowfall in Siberia and other Arctic lands. The earlier snow insulates the soil, allowing the land to cool more rapidly. This results in a southwards shift of the jet stream and builds higher atmospheric pressures farther to the south, which increases the odds of cold spells and blocking high pressure systems that can cause extended periods of unusually cold and snowy weather in the mid-latitudes.
     
  2. Marvolo Registered

    Joined:
    Dec 29, 2006
    Messages:
    47,627
    Likes Received:
    10,546
    Phil really screwed the pooch this year. In my area, Monday it was raining and 39 degrees and Tuesday it was 60 degrees and sunny. WTF!
     
  3. Ant-manic Registered

    Joined:
    Feb 11, 2013
    Messages:
    4,016
    Likes Received:
    1
    i can't blame the groundhog for not adjusting for global warming.
     
    blueharvest likes this.
  4. Piper Maru Guest

    Joined:
    Jul 7, 2012
    Messages:
    7,452
    Likes Received:
    5
    For a couple of weeks where I live it was really warm, no snow in a long time and then bam, snow and wind and ugh.
     
    blueharvest likes this.
  5. bored One Sexy Lemur

    Joined:
    Sep 18, 2003
    Messages:
    13,282
    Likes Received:
    5
    It's mostly been in the 40s and 50s where I live the last few weeks. Then last Friday it got up to 85. Then yesterday it snowed...
     
    blueharvest likes this.
  6. chamber-music Infinity Ammo

    Joined:
    Feb 21, 2005
    Messages:
    36,947
    Likes Received:
    2,694
    40c =104f in England this upcoming Monday. Europe has been having a crazy hot summer
     
  7. Spider-Fan83 with great power...

    Joined:
    May 5, 2006
    Messages:
    7,882
    Likes Received:
    625
    upload_2022-7-15_15-13-43.png

    upload_2022-7-15_15-14-12.png
     
  8. Marvolo Registered

    Joined:
    Dec 29, 2006
    Messages:
    47,627
    Likes Received:
    10,546
    104°F in England...

    :shock

    We're so ****ed.
     
    Iceman likes this.
  9. chamber-music Infinity Ammo

    Joined:
    Feb 21, 2005
    Messages:
    36,947
    Likes Received:
    2,694
    That melanin is finally coming in handy for us non-pale skinned British folk.
     
    Iceman likes this.
  10. Iceman Daffy Duck Vs The Joker

    Joined:
    Dec 27, 2005
    Messages:
    173,901
    Likes Received:
    51,815
  11. Morg Grumpy mod

    Joined:
    Jul 29, 2003
    Messages:
    64,782
    Likes Received:
    3,045
  12. Boom I got nothin'

    Joined:
    Jul 2, 2003
    Messages:
    52,194
    Likes Received:
    14,881
    Notice how you don't see catty comments from politicians on Twitter about "gLoBaL wArMiNg" when high temperatures are literally killing people.
     
  13. Marvolo Registered

    Joined:
    Dec 29, 2006
    Messages:
    47,627
    Likes Received:
    10,546
    Europe needs to make AC the norm for all residence. Dont even let someone build a living space without AC.

    AC should also be tax deductible. If governments won't stop or slow down climate change they should pay the bills to keep us cool.
     
  14. Marvolo Registered

    Joined:
    Dec 29, 2006
    Messages:
    47,627
    Likes Received:
    10,546
    UPS trucks dont have air conditioning!

     
  15. Lily Adler Politically Delicious (P) (she/her/hers)

    Joined:
    Aug 24, 2011
    Messages:
    45,004
    Likes Received:
    16,593
  16. Lily Adler Politically Delicious (P) (she/her/hers)

    Joined:
    Aug 24, 2011
    Messages:
    45,004
    Likes Received:
    16,593
  17. DeadlyWest A Flare in the Dark (he/him/his)

    Joined:
    Jan 2, 2018
    Messages:
    1,886
    Likes Received:
    3,046
    Formula 1 is literally developing a synthetic version of fuel which gets its energy via atmospheric carbon rather than fossil fuels, which is at the stage that it worked when used for an F1 car made in the 90s.

    ‘I’m expecting to have fun’ says Vettel, as he prepares for carbon neutral-fuelled Silverstone run in Mansell’s 1992 Williams | Formula 1®

    F1 intends for this fuel to be used from the 2026 season and on, as well as wishing to distribute it for its use in road cars.

    We're a lot closer to the complete disregard of fossil fuels than Madeley thinks

    But that would also eat into the profits of the Oil industry which considering the above is basically a ticking time bomb that won't exist by 2040. So of course, that's not gonna happen
     
  18. Morg Grumpy mod

    Joined:
    Jul 29, 2003
    Messages:
    64,782
    Likes Received:
    3,045
  19. squeekness The mighty squeek!

    Joined:
    Aug 29, 2005
    Messages:
    127,009
    Likes Received:
    5,331
  20. Iceman Daffy Duck Vs The Joker

    Joined:
    Dec 27, 2005
    Messages:
    173,901
    Likes Received:
    51,815
  21. DeadlyWest A Flare in the Dark (he/him/his)

    Joined:
    Jan 2, 2018
    Messages:
    1,886
    Likes Received:
    3,046
    Iceman likes this.

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice
monitoring_string = "afb8e5d7348ab9e99f73cba908f10802"