JETSTREAMS in the stratosphere

This post was created to publish any information about JETSTREAMS

jetstreams global

The link below is for the animation which is MUCH BETTER than the still snap above. Go to the link and enjoy the jetstreams in action


Thanks to GAIL COMBS for posting this link on this fabulous Jetstream animation

ANY FOLLOW UP INFORMATION/NEWS/COMMENTS will appear in the comments section below
Please click on the title to load the comments if necessary


8 comments on “JETSTREAMS in the stratosphere

  1. A picture of the global jet streams at 200hpa taken on the 21st May 2014

    The jet streams strengthen in the winter
    Notice how the SH Jet streams are stronger than the NH curently because we are approaching winter here in Australia
    Of interest here also is the strong sub tropical jet BUT a very weak sub polar jet which is required for strong cold fronts to push on to the Australian mainland
    The westerly surface low pressure belt also contracted south
    may 2014 jetstream global


    my collection of jetstreams pics’ here

  2. AUGUST 2014
    Piers Corybyn forecast re: Jetstream behaviour

    jetstream gives England a heat wave august 2014
    “Piers Corbyn, forecaster for WeatherAction, said a colossal swathe of roasting air is poised to flood in from Spain and the Sahara Desert.

    He said: “This is due to the jet stream which is going to stay unusually elongated keeping high pressure to the east.

    “We are going to get a steady flow of air from Spain, Africa and the Sahara with the extreme heat also triggering some thunder storms.

    “It is going to be mostly sunny and very pleasant and we could even beat the record high for August of 101.3F (38.5C) set in 2003.

    “We are definitely looking at what could turn out to be the hottest August on record after a cooler start to the month.”

  3. Some thought provoking comments by Steven Wilde ,JAMIE and Geoff Sharpe
    on the Jetstream behaviour

    Stephen Wilde says
    “I think I’m pretty close with the concept of solar effects on ozone in the stratosphere changing the gradient of tropopause height between equator and poles so as to alter jet stream behaviour between zonality and meridionality to change global albedo which influences the proportion of solar energy getting into the oceans.

    There might well be additional detail to fit into that overall scenario but I cannot see any reasonable alternative to that general overview.

    Having been drawing attention to the jet stream aspect since 2007 I’m pleased to see it coming to the fore”.

    Geoff says
    “The jet stream bends because of the greater occurrence of low pressure systems which are equally backed up by intense high pressure systems. The speed of the jet stream is also enhanced by this phenomenon.

    So far with the current Australian winter we are seeing an even greater occurrence of strong low pressure systems.

    The upcoming NH winter will probably be more brutal than experienced over recent years if this trend continues. Those in the UK should prepare for their share this time around.

    “There is huge confusion generally around the topic of the ‘polar vortex’ and the ‘jet stream’. What we regard as the ‘jet stream’ which is largely responsible for our patterns of weather is in fact more correctly described as the polar front jet stream, driven by the temperature gradient between Arctic and subtropical air masses, typically at a height of 10km.

    Strictly speaking, the Polar Vortex is the low ozone cell of very cold, ozone depleted air which forms above the North or South Pole during winter when sunlight is absent. The much higher Polar Night Jet circles this vortex, which breaks down in spring, along with the Polar Night Jet, returning during winter. The Americans describe the ‘polar vortex’ as the lower altitude winter phenomenon caused by the polar front (and hence the polar front jet stream) diverting far south over the continental mass, allowing much colder air to dominate.

    But the confusion doesn’t end there. This summer, we heard about the ‘polar vortex’ being responsible for much cooler temperatures over Eastern and Central US. But it wasn’t strictly a ‘polar vortex’ because that is a winter phenomenon associated with the Polar Vortex air mass which does not exist in summer! Colder air most certainly does prevail over the pole, even in summer, and it is this air which penetrated further south than normal, along with the mid-latitude, lower altitude polar front jet stream – the ‘jet stream’.

    It seems to me that current scientific understanding of the various jet streams which encircle our planet at differing altitudes is far from perfect and this appears to be the source of the confusion surrounding the subject of polar vortices, ‘jet streams’, planetary waves/Rossby waves etc in general. It’s actually very difficult to find information on the relationship between the Polar Night JS and the polar front JS and how they affect our winter weather, plus the subtle difference between the effect of the polar front jet stream during summer and the same jet during winter, when the Polar Vortex proper exists. It is therefore probably no surprise that the complex set of interactions these jets have with internal and external climate/weather forcings (e.g. solar, lunar, AMO, PDO) is also imperfectly understood; thus predictions of weather based upon them are never going to be infallible. Perhaps they never will be, if chaos theory has anything to do with it. Perhaps we will never be in a position to accurately predict weather in the short term, medium term or even very long term (climate), simply because of the inherently chaotic nature of our planet’s coupled oceanic/atmospheric dynamic system.

    Discussed here

  4. July 19th 2014
    A good case study here of jet stream meanders and an anomalous cold pool bringing some COLD RECORDS to parts of the US

    jetstream brings cold records to east US july 19th 2014

    Autumnlike Chill Sets More Records in Central US, South

    “Daytime temperatures on Thursday in parts of Kansas, Oklahoma and Arkansas failed to rise out of the 60s due to the combination of thick cloud cover and occasional rain.

    The high temperature Thursday in Wichita, Kansas, was only 67 degrees, which is 26 degrees below average for the middle of July. To add more perspective, 67 is their average high temperature for the latter part of October.

    Earlier in the week, temperatures failed to climb past the 60s F from the eastern part of the Dakotas, through Minnesota, northern Wisconsin and the Upper Peninsula of Michigan on Monday.

    Minneapolis, home of the 2014 Major League Baseball All-Star Game, set a record low maximum temperature of 65 on Monday, breaking the old record of 68 set in 1884.
    Nearly a dozen cities across the Plains set or tied record lows Tuesday morning including Omaha, Nebraska; Kansas City, Missouri; Rapid City, South Dakota; and Dodge City, Kansas.

    The polar air continued to expand southward over the Plains, eastward across the Midwest and touched the interior South and Appalachians Wednesday and Thursday.

    During Wednesday morning, record low temperatures in the books since the 1800s were challenged at Nashville and Oklahoma City. At Nashville, the record of 57 F, set in 1886 was tied.

    High temperatures on Wednesday ranged from the upper 60s to the lower 70s from Chicago and Milwaukee to Detroit, Indianapolis and Cleveland.

    Dozens of cities over the Midwest challenged record low temperature through Thursday morning. Fort Wayne, Ind., dipped to 48 degrees early Thursday, breaking the old record of 51 set in 1976.
    Early Friday morning, the chilliest temperatures were found across parts of Ohio, West Virginia, Pennsylvania and New York state, where temperatures dipped into the 40s in some locations.

    The temperature at Charlotte, North Carolina, came within 1 degree of tying the record of 62 degrees set in 1896 on Friday.”

  5. Southern hemisphere
    30th June 2015

    A weak sub polar jet in conjunction with low amounts of snow on the Australian alps
    and a strong sub tropical jet with a southern anomaly

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