Hurricane FELICIA (Text)

Hurricane Felicia Discussion Number  10...Corrected
NWS National Hurricane Center Miami FL       EP062021
800 AM PDT Fri Jul 16 2021

Corrected 24-hour forecast position
Compact Hurricane Felicia has continued to rapidly strengthen this
morning with a well-defined, warm (>15C) clear eye now evident in
infrared satellite imagery. However, the convective cloud tops
surrounding the eye have warmed by almost 10 deg C during the past
several hours, and a 1022Z ATMS microwave satellite pass showed the
inner core convection a little less organized. Subjective satellite
intensity estimates from TAFB and SAB were a consensus T6.0/115 kt
and objective estimates from UW-CIMSS ADT over the past couple of
hours have averaged T5.7/105 kt. The initial intensity is raised to
110 kt, and just below category 4 strength, for this advisory based
on a blend of the various satellite intensity estimates and the
slightly degraded aforementioned convective features.
Felicia is moving west-southwestward or 255/07 kt. Strong deep-layer
ridging to the north of the hurricane is expected to keep Felicia
moving west-southwestward for the next 12-24 h. Thereafter, the
global and regional models all show the ridge relaxing somewhat,
which should allow Felicia to move more westward in the 24-120-hour
forecast period. The new NHC track forecast is essentially on top of
and just an update of the previous advisory track, and lies near the
middle of the tightly packed simple and corrected consensus models
Some additional slight strengthening could occur this morning due to
low vertical shear and warm SSTs conditions, with Felicia briefly
becoming a category 4 hurricane. However, the warm water beneath the
powerful hurricane isn't very deep as indicated by upper-ocean heat
content values currently only around 5 units, which suggests that
cold upwelling could begin at any time during the next 12 hours.
Ocean heat content values are forecast to remain below 10 units from
24-96 hours, and decreasing to less than zero thereafter. Thus, slow
weakening is forecast to begin by 24 h and continue through the
remainder of the forecast period despite the favorable low (<10 kt)
vertical wind shear regime that Felicia will be moving through. The
new intensity forecast is similar to the previous advisory, and
closely follows the consensus intensity models NOAA-HCCA and IVCN.
INIT  16/1500Z 15.0N 121.6W  110 KT 125 MPH
 12H  17/0000Z 14.8N 122.7W  110 KT 125 MPH
 24H  17/1200Z 14.6N 124.3W  105 KT 120 MPH
 36H  18/0000Z 14.6N 126.0W  100 KT 115 MPH
 48H  18/1200Z 14.7N 127.8W   90 KT 105 MPH
 60H  19/0000Z 14.8N 129.6W   85 KT 100 MPH
 72H  19/1200Z 14.8N 131.4W   80 KT  90 MPH
 96H  20/1200Z 14.4N 135.0W   65 KT  75 MPH
120H  21/1200Z 13.7N 138.5W   55 KT  65 MPH
Forecaster Stewart

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Page last modified: Friday, 31-Dec-2021 12:09:52 UTC