Tuesday, May 14, 2013

Cyclone "Mahasen" - Has moved North and expected to intensify in 24hrs and turn N-N-E !

Latest analysis show that the system is gathering pace again and has moved North.
Now it has moved above Chennai parallel.
The system is now expected to track N-E and intensify into a Severe Cyclone in next 24 or 36 hrs.
Position is at 14.0N , 85.4E.
As of now, the pressure and winds remain the same...
Pressure around 985 mb and winds gusting up to 90 kmph.

8:30am, Satellite Visible shot reveals the partially exposed center and Heavy convective activity over N,W and S-W quadrant of the Cyclone. Less convective activity seen over East,South of system. Now "Mahasen" is around 400 km S-S-E of visakhapatnam

JTWC warning and path projection at 8:30am IST
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

TROPICAL CYCLONE 01B (MAHASEN), LOCATED APPROXIMATELY 562 NM SOUTH-
SOUTHWEST OF KOLKATA, INDIA, HAS TRACKED NORTHWARD AT 08 KNOTS OVER 
THE PAST SIX HOURS. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY 
SHOWS A LOW-LEVEL CIRCULATION CENTER (LLCC) LOCATED ON THE EASTERN 
EDGE OF A LARGE CENTRAL DENSE OVERCAST FEATURE. A 132353Z SSMIS 
IMAGE AND A 132143Z TRMM MICROWAVE IMAGE SHOW THE BULK OF THE DEEP 
CONVECTION IS SHEARED TO THE WEST OF A WELL DEFINED CENTER WITH 
SHALLOW CONVECTIVE BANDING ELSEWHERE. BOTH IMAGES REVEAL A NORTHWARD 
TURN IN THE STORM MOTION. THE INITIAL POSITION IS BASED UPON THE 
MICROWAVE IMAGES WITH INCREASED CONFIDENCE. THE PGTW DVORAK CURRENT 
INTENSITY ESTIMATE IS 45 KNOTS, BUT THE INITIAL INTENSITY REMAINS 
ASSESSED AT 50 KNOTS DUE TO THE TIGHTLY WRAPPED STRUCTURE OF THE 
SYSTEM. UPPER LEVEL ANALYSIS INDICATES RADIAL OUTFLOW IS BEING 
OFFSET BY MODERATE (15-20 KNOTS) VERTICAL WIND SHEAR (VWS). TC 01B 
IS CURRENTLY TRACKING NORTH ALONG THE WESTERN EDGE OF THE 
SUBTROPICAL STEERING RIDGE. TC 01B IS EXPECTED TO SLOWLY TRACK NORTH-
NORTHEAST FOR THE NEXT 12 HOURS AS THE STEERING RIDGE REMAINS WEAK. 
AFTER TAU 12, THE SYSTEM IS EXPECTED TO SLOWLY ACCELERATE AND TRACK 
NORTHEAST AS IT GRADUALLY INTENSIFIES DUE TO WEAKENING VWS AND THE 
SYSTEM BEGINS TO BE INCREASINGLY INFLUENCED BY THE MIDLATITUDE 
WESTERLIES. TC 01B IS FORECAST TO PEAK AT 70 KNOTS BY TAU 48 AND IS 
EXPECTED TO REMAIN AT TYPHOON STRENGTH THROUGH TAU 72. AFTER TAU 72, 
TC 01B WILL BEGIN TO WEAKEN AS VWS INCREASES AND LAND INTERACTION 
ALLOWS FOR DISSIPATION AT TAU 96. DYNAMIC MODEL GUIDANCE IS SPLIT AS 
ECMWF AND EGRR CURVE THE SYSTEM EAST-NORTHEAST INTO THE SUBTROPICAL 
RIDGE, WHILE NVGM TRACKS PRIMARILY NORTHWARD. GFS CONTINUES TO 
REMAIN THE MOST CONSISTENT MODEL WITH A GRADUAL NORTHEAST TRACK 
SIMILAR TO GFDN, WBAR, AND THE MULTI-MODEL CONSENSUS. IN LIGHT OF 
THIS, THE JTWC FORECAST IS POSITIONED CLOSE TO THE MULTI-MODEL 
CONSENSUS WITH LOW CONFIDENCE DUE TO THE LARGE SPREAD IN MODEL 
SOLUTIONS. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 140000Z IS 22 FEET.

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