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Hurricane Bonnie Discussion Number 36
NWS National Hurricane Center Miami FL EP042022
900 AM MDT Wed Jul 06 2022
There's been quite a bit of improvement this morning in Bonnie's
inner core structure and a cloud-filled eye reappeared in first
light visible imagery. A 1216 UTC SSMI/S microwave pass revealed a
partial eyewall with about 70 percent coverage in the north through
southwest quadrants and recent enhanced infrared images show Bonnie
attempting to close off a white ring with -77C cloud top
temperatures. The initial intensity is raised to 90 kt for this
advisory, in accordance with the subjective satellite intensity
estimates. Bonnie's surface wind profile has been reduced in all
quadrants based on a 0448 UTC METOP-B scatterometer overpass and
subsequently has been adjusted downward in the forecast.
The predicted decrease in vertical wind shear has allowed Bonnie to
make a comeback. This sudden intensification is expected to be
temporary, however, and Bonnie should begin to weaken slowly on
Thursday while it begins its track over decreasing oceanic surface
temperatures. Dry, stable environmental conditions will also
contribute to its eventual dissipation by late this weekend. The
NHC forecast is again adjusted downward from the previous one and is
based mainly on the global models and the IVCN intensity aid.
Bonnie should degenerate to a remnant low in 4 days, if not earlier,
and open into a trough of low pressure early next week.
Bonnie's moving westward, or 280/10 kt within the westerly
mid-level steering flow of a subtropical ridge to the north. There
are no changes to the forecast track philosophy. The cyclone
should continue on a westward to west-northwestward fashion
with an increase in forward speed commencing Thursday. The
official forecast is essentially the same as last night's advisory
and agrees with the TVCE multi-model consensus.
Although Bonnie will be moving farther away from the southwestern
coast of Mexico, rough surf and the potential for rip currents will
continue to affect portions of the coast of southwestern Mexico
today.
FORECAST POSITIONS AND MAX WINDS
INIT 06/1500Z 16.1N 108.9W 90 KT 105 MPH
12H 07/0000Z 16.5N 110.5W 80 KT 90 MPH
24H 07/1200Z 17.0N 113.0W 75 KT 85 MPH
36H 08/0000Z 17.6N 115.9W 65 KT 75 MPH
48H 08/1200Z 18.2N 119.1W 55 KT 65 MPH
60H 09/0000Z 18.8N 122.7W 45 KT 50 MPH
72H 09/1200Z 19.2N 126.4W 35 KT 40 MPH...POST-TROPICAL
96H 10/1200Z 19.4N 133.5W 25 KT 30 MPH...POST-TROP/REMNT LOW
120H 11/1200Z...DISSIPATED
$$
Forecaster Roberts
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