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The weak echo region is characterized by weak reflectivity with a sharp gradient to strong reflectivity above it and partially surrounding the sides. The region of the precipitation lofted above the WER is the echo overhang consisting of precipitation particles diverging from the storm's summit that descend as they are carried downwind.
Against all expectations, the storm continued to track in a northerly direction, [91] until later that day, when it made a sharp, sudden, southwestward turn. Madi started losing all its convection to the strong wind shear. [92] Another subtropical ridge located over India had steered the system southwestward. [93]
Convection remained poorly-organized and mostly confined to eastern portions of the cyclone, as it traversed the eastern Caribbean Sea. [9] Multiple circulation centers were noted during the overnight of August 27–28, all rotating around a broad general center. One such center moved over St. Croix and produced gale-force gusts.
Thereafter, an eyewall replacement cycle and decreasing sea surface temperatures caused the storm to steadily weaken. It fell below major hurricane status on September 8 and further weakened to a tropical storm on September 9. The total collapse of convection on September 10 marked its degeneration into a remnant low.
This would trigger the start of new convection, which would then cause a new eyewall. Since the new eyewall was outside the original one, the first eyewall would be choked of energy and fall apart. In addition, since the new eyewall was broader than the old one, the winds would be lower due to a less sharp pressure difference. [13]
Natural convection may be slower than using a solar-powered fan. Sharp 90-degree angles should be avoided in the construction of the tube – two 45-degree bends produce less-turbulent, more efficient air flow. While smooth-wall tubes are more efficient in moving the air, they are less efficient in transferring energy.
The combination of an eyewall replacement cycle, cooler waters, and entrainment of dry air caused Cristina to begin weakening shortly after peak; it fell to tropical storm intensity early on June 14 and degenerated to a remnant low by 06:00 UTC the next morning. The low moved erratically within low-level flow and dissipated early on June 19. [35]
The evaporator uses separate parts to create the overall system; a heat exchanger, separation tank and for the forced circulation system (as opposed to the natural circulation system) a circulation pump are standard although can be subject to change depending on the liquids properties of the mixtures being separated and specific design.
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