Friday, June 10, 2011

"98A" - Slowly Moved N-N-E and not intensified in past 24 hrs

"98A" is still a Low pressure system and very slowly it has moved N-N-E. No intensification so far.
JTWC and other weather models predict that the system can become into a Cyclone in another 48 hrs.


JTWC warning and Map
=====================

THE AREA OF CONVECTION PREVIOUSLY LOCATED AT 18.7N 
69.8E IS NOW LOCATED NEAR 18.4N 70.3E, APPROXIMATELY 150 NM WEST-
SOUTHWEST OF MUMBAI, INDIA. ANIMATED INFRARED SATELLITE IMAGERY 
SHOWS AN AREA OF CONVECTION ALONG THE SOUTHWESTERN PERIPHERY OF A 
LOW LEVEL CIRCULATION CENTER (LLCC) THAT HAS PERSISTED FOR SEVERAL 
DAYS. THE DEEPEST CONVECTION IS LOCATED JUST WEST OF THE LLCC WITH A 
SHALLOWER AREA OF CONVECTION TO THE EAST. A 09/1651Z METOP-A 89 GHZ 
MICROWAVE SATELLITE IMAGE ALSO DEPICTS CONVECTION ALONG THE WESTERN 
AND SOUTHERN QUADRANTS. A 09/1714Z ASCAT PASS SHOWS A STRONG (30-35 
KNOT) SOUTHWESTERLY SURGE ENHANCING CONVECTION IN THE SOUTHERN AND 
WESTERN QUADRANTS. RECENT WATER VAPOR IMAGERY SHOWS FAVORABLE ZONAL 
AND EQUATORWARD OUTFLOW, HOWEVER POLEWARD OUTFLOW CONTINUES TO BE 
SUPPRESSED BY AN UPPER LEVEL TROUGH EXTENDING FROM JUST NORTH OF THE 
SYSTEM INTO THE HIMALAYAS. THIS TROUGH IS EXPECTED TO TRAVERSE THE 
REGION IN THE NEXT 24 HOURS, RESULTING IN A GRADUAL DECREASE IN 
SUBSIDENCE. THE 09/12Z UPPER AIR STREAMLINE ANALYSIS INDICATES THIS 
SYSTEM IS LOCATED BENEATH A RIDGE AXIS IN A REGION OF 10-20 KNOTS OF 
VERTICAL WIND SHEAR. THE LLCC IS GRADUALLY DRIFTING EASTWARD WITHIN 
A WEAK STEERING ENVIRONMENT. MEAN SEA LEVEL PRESSURE AT MUMBAI, 
INDIA HAS REMAINED STEADY AT 100O MB DURING THE PAST 24 HOURS. 
MAXIMIMUM SUSTAINED WINDS ARE ESTIMATED AT 18-23 KNOTS. MINIMUM SEA 
LEVEL PRESSURE IS ESTIMATED TO BE NEAR 999 MB. DUE TO CONTINUED 
FAVORABLE ENVIRONMENTAL CONDITIONS, THE POTENTIAL FOR THE 
DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 
HOURS REMAINS HIGH


COLA model suggests a North direction movement towards Gujarat and then move West.
COLA suggests a Cyclone size intensification on 12-Jun-2011.

IMD model also suggests more-or-less the same route, while this model did not see any Cyclone formation in another 48 hrs.
Monsoon current along S-W peninsula coast is subdued due to the presence of this system. It's expected to revive over Kerala, Karnataka  coast from 14-Jun-2011.

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