November 26, 2020

UPDATED Weather system below Cayman Islands now TD 18

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From NHC

Potential Tropical Cyclone Eighteen Discussion Number 1
NWS National Hurricane Center Miami FL AL182017
500 PM EDT Fri Oct 27 2017

Data from an Air Force Reserve Hurricane Hunter aircraft
investigating the disturbance over the northwestern Caribbean Sea
indicate that the system does not yet have a well-defined center. In
fact, the aircraft data and satellite imagery suggest that there are
multiple circulations embedded within a broader circulation at this
time. Given the lack of a well-defined center, the system is not a
tropical cyclone, but since tropical storm conditions are expected
to affect Cuba and the northwestern Bahamas in the next 24 to 36
hours, advisories are being initiated on the system as a potential
tropical cyclone at this time.

The initial intensity is set to 35 kt based on aircraft data, with
these winds found well south of the broad circulation center.
However, NOAA buoy 42057 also reported a peak 1-minute wind of 31 kt
earlier today. Aircraft data suggest that the central pressure is
around 1006 mb. The system is situated in a low-shear environment
and over warm waters, so some slow strengthening is expected in the
first 24 hours before the system reaches Cuba. The official forecast
follows the trend of the intensity consensus in showing a peak of
around 45 kt at 36 and 48 hours before the system is absorbed by an
approaching cold front in 60-72 hours.

Given the lack of a well-defined center, the initial position is and
the initial motion of 330/05 are highly uncertain. A faster
northward motion should begin soon as the disturbance begins to
recurve ahead of an approaching mid/upper-level trough moving into
the southeastern United States. This trough should cause a faster
northeastward acceleration at 24 through 48 hours. The track model
guidance is in generally good agreement on the overall scenario,
with more along than cross track spread. The NHC forecast leans
toward a blend of the ECMWF and GFS models and is a little slower
than the current multi-model consensus. Not surprisingly, given the
disorganized initial state of the system, the track forecast
uncertainty is larger than usual.


12H 28/0600Z 19.1N 84.1W 35 KT 40 MPH…TROPICAL STORM
24H 28/1800Z 21.7N 82.4W 40 KT 45 MPH
36H 29/0600Z 24.6N 79.6W 45 KT 50 MPH
48H 29/1800Z 28.0N 75.5W 45 KT 50 MPH
72H 30/1800Z…ABSORBED


From Mikes Weather Page

Mike’s Weather Page

Here is newly formed PTC#18… and expected to be Tropical Storm Philippe. Center is yet to be defined thus the delay in classification. Could effect track a little. Hurricane Hunters continue to fly in to give us data. / Mikes Weather Page APP

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  1. […] Source: Cayman Eye News From NHC Tropical Weather Outlook NWS National Hurricane Center Miami FL 800 AM EDT Fri Oct 27 2017 For the North Atlantic…Caribbean Sea and the Gulf of Mexico: Shower and thunderstorm activity has increased and become more concentrated in association with a trough of low pressure over the northwestern Caribbean… Link: Weather system below Cayman Islands now up to 60% chance […]

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