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 337 
 WTPZ41 KNHC 012033
 TCDEP1
 
 Tropical Storm Sergio Discussion Number  10
 NWS National Hurricane Center Miami FL       EP212018
 300 PM MDT Mon Oct 01 2018
 
 Sergio has not strengthened like the models and NHC have predicted
 up to this point.  Although the storm continues to have a
 well-defined curved band over the south and east portions of the
 circulation, there are pronounced dry slots that have entrained into
 the inner core.  Recent microwave images show a well-defined
 low-level eye, but the mid-level structure is less organized now as
 compared to several hours ago.  The initial intensity is again held
 at 60 kt, in agreement with an average of the Dvorak classifications
 from TAFB and SAB.
 
 The intensity forecast remains challenging.  The wind shear around
 Sergio is expected to be low for the next several days, besides for
 a brief increase in the 24- to 48-hour time period.  These
 conditions and warm SSTs beneath the cyclone during the next few
 days support strengthening.  However, as mentioned above, the storm
 has been struggling with dry air entrainment and that could continue
 to plague the system.  The latest models continue to show steady
 strengthening, and the NHC forecast does likewise.  However, this
 forecast shows a slower rate of intensification in the short term.
 Beyond a few days, a combination of slightly lower SSTs and a
 decrease in moisture should cause a slow weakening trend.  The NHC
 intensity forecast is in best agreement with the IVCN model.
 
 Sergio is moving just south of due west at 11 kt.  A westward
 motion at about the same forward speed is expected during the next
 day or so while the storm remains on the south side of a mid-level
 ridge.  A turn to the west-northwest is expected by late Tuesday
 followed by a northwestward motion on Wednesday as the western
 portion of the mid-level ridge erodes due to a large scale mid- to
 upper-level trough near the southwestern U.S. By the end of the
 forecast period, a ridge is expected to build to the north of
 Sergio, which should cause a turn back to the left.  The models
 have shifted to the south and west this cycle, and the NHC track
 forecast has been adjusted in those directions.
 
 FORECAST POSITIONS AND MAX WINDS
 
 INIT  01/2100Z 11.3N 111.0W   60 KT  70 MPH
  12H  02/0600Z 11.3N 112.7W   70 KT  80 MPH
  24H  02/1800Z 11.6N 114.8W   80 KT  90 MPH
  36H  03/0600Z 12.4N 116.5W   90 KT 105 MPH
  48H  03/1800Z 13.5N 118.0W   95 KT 110 MPH
  72H  04/1800Z 15.4N 120.2W  100 KT 115 MPH
  96H  05/1800Z 17.0N 123.0W   95 KT 110 MPH
 120H  06/1800Z 17.8N 126.0W   85 KT 100 MPH
 
 $$
 Forecaster Cangialosi
 
 
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