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uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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#1
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http://www.osdpd.noaa.gov/data/sst/a....3.25.2010.gif
Shows a quite cold pool in the Gulf of Mexico - but with a warm centre - is this to do with undersea contours or something else I wonder. It shows up very well on IR images from the GOES E satellite. Cheers James -- James Brown |
#2
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James Brown wrote:
http://www.osdpd.noaa.gov/data/sst/a....3.25.2010.gif Shows a quite cold pool in the Gulf of Mexico - but with a warm centre - is this to do with undersea contours or something else I wonder. It shows up very well on IR images from the GOES E satellite. Cheers James This is the so-called "Loop Current". It's a common feature in the Gulf of Mexico. There's a huge number of references available if you Google "Gulf of Mexico Loop Current". -- Norman Lynagh Tideswell, Derbyshire 303m a.s.l. |
#3
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In message , Norman
writes James Brown wrote: http://www.osdpd.noaa.gov/data/sst/a....3.25.2010.gif Shows a quite cold pool in the Gulf of Mexico - but with a warm centre - is this to do with undersea contours or something else I wonder. It shows up very well on IR images from the GOES E satellite. Cheers James This is the so-called "Loop Current". It's a common feature in the Gulf of Mexico. There's a huge number of references available if you Google "Gulf of Mexico Loop Current". Thank you so much for that Norman - quite a wealth of material there, Cheers James -- James Brown |
#4
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On 27 Mar, 22:03, James Brown
wrote: In message , Norman writes http://www.osdpd.noaa.gov/data/sst/a....3.25.2010.gif Shows a quite cold pool in the Gulf of Mexico - but with a warm centre - is this to do with undersea contours or something else I wonder. It shows up very well on IR images from the GOES E satellite. This is the so-called "Loop Current". It's a common feature in the Gulf of Mexico. There's a huge number of references available if you Google "Gulf of Mexico Loop Current". Thank you so much for that Norman - quite a wealth of material there, Let me know what you find out. I got turned off when I saw the word anomaly. This is from one page: "…if the water is still warm at lower depths, then water being pulled to the surface remains warm, and the hurricane can increase in intensity if other atmospheric conditions are also conducive to strengthening. Meteorologists look for areas of deep warm water of at least 26 degrees Celsius (79°F). A continuous supply of warm water is one of several critical factors in enabling hurricanes to intensify beyond the initial level of a major hurricane (Category 3)" [So how does the water get heated to that depth in a current doing 4 or 5 knots? The temperatures in the link vary from -3 to 1 degree Centigrade. Not a lot for a current that fuels northern Europe. Is that what they meant by anomaly or was it just the usual lack of imagination? North America has been subject to severe floods for a while now. And with the thaw the Mississippi must have been an active part of all this.] "If the storm moves fast it may not intensify to a grand scale. However, since Hurricane Ivan in 2004, the 5 hurricanes to make it to Cat 5 strength, 3 of them went straight through the Loop Current (this isn't counting the Cat 3 and 4 storms.)" So it all depends on, well.... that depends...? |
#5
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I thought I'd seen this loop effect somewhere before. It's (probably)
the effect of an open enclosed system when the input from one reservoir is slightly greater than from the other(s). No doubt the loop has a slightly different lien when the chief input source is the stuff coming up from Mexico. http://en.wikipedia.org/wiki/Fluidics That would (obviously) occur in summer. In a closed system, this principal becomes a vacuum pump rather than a whistle. Further reduction in its intricacy and it reverts to a spigot or (as in this case) a river mouth. |
#6
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This shows the Atlantic SST anomaly.
http://www.nhc.noaa.gov/tafb/atl_anom.gif A 2C difference is a lot Hurricane wise. Other factors of course affect Hurricne formation. I live in Florida..... |
#7
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On 29 Mar, 11:39, MahFL wrote:
This shows the Atlantic SST anomaly. http://www.nhc.noaa.gov/tafb/atl_anom.gif* It's a very graphic graphic. All the more interesting in that outside of the Arctic I'd thought anything less than cyan impossible. It does demonstrate a nice cyclonic effect on the thermo-haline column though. We've just been through a period of dual quakes, dual occluded fronts and sdual/s twin focussed SSP centres. You can call them elongations if you like. There is nothing like a twin gyre to make me feel smug and comfortable with it. (*I've bagged it and will post a link later, IIR.) A 2C difference is a lot, Hurricane wise. Other factors of course affect Hurricane formation. I live in Florida..... A 2 degree Centigrade difference involves a fairly small pressure change; which in a hurricane occurs every fewful feet. I live elsewhere. It doesn't vary the fact. Or does it? |
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