Monday, 4 December 2017

NASA finds Tropical Depression Dahlia's center devoid of rainfall

GPM image of Dahlia 



       On Dec. 4 at 1441 UTC (9.41 a.m EST) The GPM core satellite analyzed Tropical Depression Dahila's ranfall and found the circulation center devoid of precipitation. light rainfall near 0.1 inches per hour was falling east of the center (light blue). Credit gives to NRL / NASA / JAXA.

      Tropical Depression dahila was weakening into a remnant low pressure area when the global precipitation Measurement mission core satellite og GPM analyzed the storm's precipitation. GPM found the center devoid of rainfall and light rainfall to the east center.


               The map shows that heavy rainfall during the past week resulted in an area of potential landslides on the slopes of southem java.

      On Dec.1 at 10 a.m east (1500 UTC) Tropical cyclonr Dahila had maximum sustained winds near 50 knots (57 mph/92 kph). Dalia was located near 10.7 degrees south latitude and 110.6 degrees east longitude. its about 738 nautical miles north-northwest of learmonth, Australia. The joint Typhoon warning center (JTWC) predicts that tropical cyclone Dahila will initially intensify to tropical strom force as it moves over the indian ocean toward the northwest Australia.




                      On Dec. 3 at 4 p.m EST (2100 UTC) the joint typhoon warning center issued the final bulletin on Dahlia. at that time, Dahlia was still a tropical storm with maximum sustained winds near about 35 knots (40 mph). Dahlia was centered near 16.2 degrees south latitude and 111.9 degrees east longitude. that's about 402 nautical miles north-norhwest of learmonth Australia. 

        At the time of the last bulletin, infrared satellite imagery showed that the strongest stroms were beginning to decouple from the low level circulation center and moving off to the storm had become a depression then weakened further to a remnant low pressure area.



              On Dec. 4 at 1441 UTC (9.41 a.m. EST), the GPM core satellite passed over Dahlia in the southern indian ocean. Data collected by GPM'S microwave imager (GMI) and dual-frequency precipitation Radar (DPR) instruments were used to show the intensity of precipitation. 

           The Australian Bureau of meteorology issued wind warning from 10.00 p.m. WST (local time, Western Australia) on Dec. 4, for the period unrill midnight WST Dec. 5, 2017. A Strong Wind Warning for the following areas....
1. perth local waters 
2. Gascoyne Coast 
3. Geraldton coast 
4. Perth Coast 
5. Geographe Coast 

           Dahlia was moving into cooler sea surface temperatures and an area of stronger wind shear, both factors that were expected to lead to its dissipation later on Dec.4.

       




   

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