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Hurricane BERYL


Hurricane Beryl Discussion Number   7
NWS National Hurricane Center Miami FL       AL022018
1100 PM AST Fri Jul 06 2018

While Beryl continues to produce a cluster of convection near the
center, the system appears a little less organized than earlier.
In addition, there are no recent microwave overpasses showing an eye
under the overcast.  The various satellite intensity estimates are
unchanged since the previous advisory, so the initial intensity is
held at 70 kt.  However, it is possible that this is a bit generous
given the observed decay of the cloud pattern.

The hurricane continues moving westward or 280/12.  The track
guidance insists that a turn toward the west-northwest and an
increase in forward speed should occur in the next 12-24 h as Beryl
continues to be steered by the strong subtropical ridge to the
north.  The new NHC forecast again follows this scenario, but it
lies on the south side of the guidance envelope due to current
trends and the overall northeast bias that the track guidance has
shown so far.  The new NHC track has the center near the Lesser
Antilles in about 48 h, over the north central Caribbean Sea in
about 72 h, and near eastern Cuba in about 96 h - if the system
actually survives that long.

Beryl is expected to remain in a light vertical wind shear
environment for 36 h or so, then encounter steadily increasing
westerly shear as it moves into the Caribbean Sea.  The intensity
guidance forecasts less strengthening during the time of favorable
conditions than previously, and based on this first part of the
intensity forecast is lowered slightly from that of the previous
advisory.  Steady to rapid weakening should occur over the eastern
Caribbean due to stronger shear, and the current forecast has Beryl
weakening to a tropical wave after 96 h.  An alternative scenario,
supported by the large-scale models, is that Beryl weakens to a
tropical wave near the 72-h point.

The technical issue with the NHC wind speed probabilities text
products at land locations has been resolved.  The wind speed
probability values provided in the text product, the graphics on
the the NHC website at, and the publicly
disseminated grid files will all correctly reflect the reduced
probabilities over land.

Key Messages:

1. Beryl is forecast to be a hurricane when it moves through the
Lesser Antilles Sunday night or Monday, and the chance of some
islands receiving direct impacts from wind and rainfall are
increasing.  Hurricane and tropical storm watches are in effect
for some of the countries in the Lesser Antilles, and additional
watches could be required for other islands early Saturday.

2. Due to its very small size, there is greater-than-usual
uncertainty in the analysis of Beryl's current intensity, and
confidence in the official intensity forecast is also lower than
normal.  Rapid changes in intensity, both up and down, that are
difficult to predict are possible during the next couple of days.


INIT  07/0300Z 10.9N  48.9W   70 KT  80 MPH
 12H  07/1200Z 11.3N  50.6W   75 KT  85 MPH
 24H  08/0000Z 12.3N  53.5W   75 KT  85 MPH
 36H  08/1200Z 13.3N  56.8W   75 KT  85 MPH
 48H  09/0000Z 14.4N  60.6W   70 KT  80 MPH
 72H  10/0000Z 16.5N  68.5W   50 KT  60 MPH
 96H  11/0000Z 19.5N  76.5W   35 KT  40 MPH
120H  12/0000Z...DISSIPATED

Forecaster Beven