BoB: INVEST 98B

[Subtrop]

98B INVEST 210927 0000 19.0N 92.9E IO 15 0

[Sciencerocks]

[doomhaMwx]

98B has most probably developed into a tropical storm based on satellite, radar, and recent ASCAT pass showing 35-40kt winds near the LLCC. This system quickly spun up in this basin just after Gulab.





Arguably, JTWC could just immediately proceed with the uprade like what they did with Gulab.

ABIO10 PGTW 280530

AN AREA OF CONVECTION (INVEST 98B) HAS PERSISTED NEAR 13.1N 89.0E, APPROXIMATELY 39.8 NM EAST OF KOLKATA. MAXIMUM SUSTAINED SURFACE WINDS ARE ESTIMATED AT 27 TO 33 KNOTS. ANIMATED VISIBLE IMAGERY SHOWS THAT INVEST 98B HAS RAPIDLY CONSOLIDATED INTO A COMPACT TROPICAL DEPRESSION OVER THE PAST SIX HOURS. ANIMATED RADAR DATA FROM INDIA AND BANGLADESH INDICATE THAT A WELL DEFINED
LOW LEVEL CIRCULATION CENTER (LLCC) HAS FORMED JUST SOUTH OF THE COASTLINE OF BANGLADESH. A 280246Z ASCAT-B PASS INDICATED A COMPACT LLCC SURROUNDED BY 25 KNOT WINDS, WITH A PATCH OF 35-40 KNOT WINDS IN THE EASTERN SEMICIRCLE UNDER DEEP, FLARING CONVECTION. THE SYSTEM IS EXPECTED TO MAKE LANDFALL WITHIN THE NEXT HOUR TO TWO TO THE SOUTHEAST OF KOLKATA AS A HIGH-END TROPICAL DEPRESSION WITH WIND GUSTS ABOVE TROPICAL STORM STRENGTH. ONCE ASHORE, THE SYSTEM SHOULD
RAPIDLY DISSIPATE. THE ENVIRONMENT IS CURRENTLY FAVORABLE, WITH VERY WARM SSTS, LOW TO MODERATE SHEAR AND GOOD DIFFLUENT OUTFLOW TO THE WEST. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO BE NEAR 1000 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS MEDIUM.

[StormTracker89]

Interesting that the RSMC (New Delhi) refuses to even acknowledge that 98B is a thing.

[Sciencerocks]

55 knots based on that eye and it is well inland. Holy crap!

[doomhaMwx]

Another good example of a "landphoon" (more commonly referred to as land depressions) in this part of the world.