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Tropical Storm LOWELL (Text)


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Tropical Storm Lowell Discussion Number  11
NWS National Hurricane Center Miami FL       EP172020
1100 PM HST Tue Sep 22 2020
 
Lowell's center is located near the northern edge of a band of deep 
convection which extends over the eastern and southern portion of 
the circulation due to moderate northwesterly shear in the 
mid-levels below the cirrus layer.  That part of the circulation 
also happens to be where the tropical storm force winds are 
predominantly situated, and a recent ASCAT pass showed that the 
strongest winds have increased to near 45 kt.  Lowell's circulation 
will be straddling a tight sea surface temperature gradient during 
the next few days, with the center moving over gradually cooler 
waters and toward a drier air mass.  As a result, little change in 
strength is expected during the next couple of days, and some 
weakening should begin by day 3 when water temperatures fall below 
25 degrees Celsius and moderate westerly or southwesterly shear 
sets in.  The new NHC intensity forecast is largely an update of 
the previous prediction and closely follows the HCCA, Florida State 
Superensemble, and IVCN intensity consensus.  Lowell is likely to 
lose its deep convection and degenerate to a remnant low by day 4.
 
Lowell has been moving steadily toward the west-northwest, or 
295/10 kt, steered by a mid-tropospheric high pressure area 
centered just off the west coast of the Baja California peninsula.  
The subtropical ridge is expected to become a little more 
established to the north of Lowell, and that should cause the storm 
to turn westward by 36 hours and continue at that heading through 
the end of the forecast period.  There continues to be very little 
cross-track spread among the track guidance, and the most 
noteworthy differences are the forward speeds depicted by the 
models, bracketed by the speedy ECMWF and the more sluggish GFS and 
COAMPS-TC models.  The models overall have continued to trend 
faster, and the new NHC track forecast is again pushed ahead of the 
previous prediction, lying close to the TVCE consensus and the HCCA 
aid.

 
FORECAST POSITIONS AND MAX WINDS
 
INIT  23/0900Z 19.8N 119.9W   45 KT  50 MPH
 12H  23/1800Z 20.3N 121.3W   45 KT  50 MPH
 24H  24/0600Z 20.7N 123.0W   45 KT  50 MPH
 36H  24/1800Z 21.0N 124.9W   45 KT  50 MPH
 48H  25/0600Z 21.1N 126.9W   45 KT  50 MPH
 60H  25/1800Z 21.2N 129.1W   45 KT  50 MPH
 72H  26/0600Z 21.2N 131.3W   40 KT  45 MPH
 96H  27/0600Z 21.0N 135.7W   30 KT  35 MPH...POST-TROP/REMNT LOW
120H  28/0600Z 21.1N 140.5W   25 KT  30 MPH...POST-TROP/REMNT LOW
 
$$
Forecaster Berg
 
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Page last modified: Thursday, 31-Dec-2020 12:11:36 UTC