WTNT44 KNHC 071455
Subtropical Storm Debby Discussion Number 1
NWS National Hurricane Center Miami FL AL042018
1100 AM AST Tue Aug 07 2018
The non-tropical low that NHC has been tracking over the North
Atlantic for the past few days has developed subtropical
characteristics and has been upgraded to subtropical storm status.
The tropical-storm-force winds associated with Debby are well
removed from the center as indicated by a recent ASCAT pass and are
occurring within a cyclonically curved band of moderate convection.
Although transition to a tropical cyclone is possible, no
significant strengthening is anticipated since the cyclone will soon
be moving over cool water and become fully embedded within a larger
mid-latitude trough approaching from the west. Debby is expected to
dissipate in about 48 hours or earlier.
The best estimate of the initial motion is toward the north or 355
degrees at 14 kt. The subtropical storm should continue on this
general track with a decrease in forward speed for the next 24
hours or so and then turn to the northeast ahead of the trough,
which will eventually absorb Debby.
FORECAST POSITIONS AND MAX WINDS
INIT 07/1500Z 38.9N 48.5W 35 KT 40 MPH
12H 08/0000Z 41.0N 48.5W 35 KT 40 MPH
24H 08/1200Z 42.7N 48.5W 35 KT 40 MPH
36H 09/0000Z 44.0N 47.0W 30 KT 35 MPH
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