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Tropical Cyclone Koji-joni


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Posted
  • Location: Taunton, Somerset
  • Weather Preferences: Snow, thunder, strong winds
  • Location: Taunton, Somerset

Tropical Cyclone 16S has formed approximately 150 miles south-southwest of the Cocos Islands. 16S has an intensity of 35kts, and has some deep convection displaced slightly west of the well defined LLC by moderate shear. This shear should ease, and with the warm waters and favourable outflow, 16S should strengthen over the next few days. 16S is moving west-southwestwards along the northern periphery of subtropical ridging to the south. This ridging is expected to retreat southeastwards over the next few days, allowing 16S to gradually turn poleward. After 72hrs, the southward motion will bring 16S into higher shear and cooler waters initiating a decline in intensity.

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Posted
  • Location: Toronto, Ontario, Canada, Altitude: 189 m, Density Altitude: 6 m
  • Weather Preferences: Tropical Cyclone, Blizzard, Thunderstorm, Freezing Cold Day and Heat Wave.
  • Location: Toronto, Ontario, Canada, Altitude: 189 m, Density Altitude: 6 m
Posted
  • Location: Taunton, Somerset
  • Weather Preferences: Snow, thunder, strong winds
  • Location: Taunton, Somerset

16S was given the name Koji by BOM but the cyclone has now moved into MeteoFrance's area of responsibilty (west of 90E) and has been give a second name; Joni. Koji-Joni (what a mouthful!) has strengthened a little over the last 12hrs, to an intensity of 45kts. Shear is low and waters are warm, but outflow is poor in all quadrants. As long as this is the case, Koji-Joni will only very slowly intensify. Outflow is expected to eventually improve, but only just before Koji-Joni moves over cooler water.

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Posted
  • Location: Taunton, Somerset
  • Weather Preferences: Snow, thunder, strong winds
  • Location: Taunton, Somerset

Koji-Joni has strengthened to 65kts, making the cyclone a cat 1 on the SS scale. Abundant deep convection resides near the tightly wrapped LLC but the eye feature evident earlier today has dissapeared. Outflow is gradually improving but is far from excellent. Koji-Joni is expected to peak at around 75kts before weakening begins.

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Posted
  • Location: Camborne
  • Location: Camborne

Hot towers, or towering thunderclouds that give off an excessive amount of latent heat, usually indicate a tropical cyclone will strengthen in six hours, and NASA's TRMM satellite saw some of them as it passed by Tropical Storm Koji.

The Tropical Rainfall Measuring Mission (TRMM) satellite passed directly above an intensifying tropical storm in the South Indian Ocean called Koji on March 8, 2012 at 2053 UTC (3:53 p.m. EST). A rainfall analysis was made from TRMM Microwave Imager (TMI) and Precipitation Radar (PR) data. Those TRMM data reveal that Koji was getting organized with bands of heavy rainfall spiraling into the storm's center.

http://www.nasa.gov/mission_pages/hurricanes/archives/2012/h2012_Koji.html

TRMM data from the flight over tropical storm Koji are shown in the 3-D image below. Those data reveal that an eye hadn't formed but powerful storm towers around KOJI's center were reaching heights of almost 15km (~9.3 miles).

Credit: NASA/SSAI, Hal Pierce

628994main_20120309_Koji-TRMM3D_full.jpg

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Posted
  • Location: Taunton, Somerset
  • Weather Preferences: Snow, thunder, strong winds
  • Location: Taunton, Somerset

Koji-Joni peaked at 70kts but shear is now destroying the storm quickly as it moves southwards. The LLC is completely exposed, and the convection is rapidly dissipating well south of the LLC. I think the next advisory will be the last.

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