NHC issues Tropical Cyclone Discussion (TCD) at Oct 2, 1:00 AM AST140
WTNT42 KNHC 012055
TCDAT2
Hurricane Kirk Discussion Number 9
NWS National Hurricane Center Miami FL AL122024
500 PM AST Tue Oct 01 2024
Kirk's appearance on satellite has improved with a large burst of
convection near the center and deep convective bands continuing to
wrap around the southeast side. A 1808 UTC GPM microwave pass
showed an improved inner-core structure with an eyewall noted on the
37 GHz channel. The UW-CIMSS DMINT intensity estimate associated
with the microwave image was 63 kt. This estimate combined with the
most recent TAFB Dvorak fix of 4.0/65 kt is the basis for making
Kirk a hurricane this afternoon with an intensity of 65 kt.
Kirk is moving slightly more poleward this afternoon, with an
estimated motion of 305/12 kt. This motion, with perhaps a slight
slowdown, should continue over the next couple of days as Kirk is
primarily steered along the southwestern edge of a subtropical ridge
positioned to its north. The western extent of this ridge will
become eroded by a long-wave trough offshore of eastern North
America towards the latter part of this week, allowing Kirk to turn
first northwestward and then recurving north-northeastward by the
end of the forecast period. The track guidance continues to be in
good agreement, and the latest NHC track forecast lies near the
middle of the guidance envelope, very similar to the prior advisory
and between the HCCA and TVCN consensus aids.
Now that Kirk's inner core is becoming better established it is
poised to intensify at a faster rate. Favorable environmental
factors surrounding Kirk, such as decreasing shear, warm 28-30 C
sea-surface temperatures, and plenty of deep-layer moisture will
continue to support a faster rate of strengthening through the 24-48
h period. The NHC intensity forecast shows Kirk becoming a major
hurricane towards the end of the forecast period. In addition,
Kirk's wind field is forecast to expand as the system moves poleward
through the end of the week. Thereafter, hard to predict inner-core
structural changes will likely lead to fluctuations in intensity,
though by day 5, shear increases again with weakening commencing.
However, Kirk will likely remain a large and formidable hurricane
through the forecast. The NHC intensity forecast is close the middle
of the intensity guidance consensus and still a little on the
upper-end towards the end of the forecast period.
FORECAST POSITIONS AND MAX WINDS
INIT 01/2100Z 16.2N 40.1W 65 KT 75 MPH
12H 02/0600Z 17.1N 41.5W 75 KT 85 MPH
24H 02/1800Z 18.3N 43.1W 85 KT 100 MPH
36H 03/0600Z 19.4N 44.6W 95 KT 110 MPH
48H 03/1800Z 20.4N 46.0W 100 KT 115 MPH
60H 04/0600Z 21.5N 47.6W 105 KT 120 MPH
72H 04/1800Z 22.9N 49.0W 110 KT 125 MPH
96H 05/1800Z 27.0N 51.0W 110 KT 125 MPH
120H 06/1800Z 33.0N 49.0W 95 KT 110 MPH
$$
Forecaster Mora/Papin
Source:
NHC issues Tropical Cyclone Discussion (TCD) at Oct 2, 1:00 AM AST---------------
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