583
WTNT44 KNHC 061458
TCDAT4
Tropical Storm Milton Discussion Number 5
NWS National Hurricane Center Miami FL AL142024
1000 AM CDT Sun Oct 06 2024
Satellite and aircraft data indicate that Milton is strengthening.
A large burst of convection is occurring in the northern semicircle
of the storm, with lots of expanding outflow. The last fix from the
NOAA Hurricane Hunter aircraft showed a pressure down to 991 mb
with maximum 500m low-level winds of about 65 kt. These winds
reduce down to the surface to about 55 kt, and this value will be
the initial intensity.
The fixes from the aircraft indicate that Milton is south of the
previously anticipated and has been moving east-southeastward or
105/5 kt. Milton is forecast to move a little south of due east
today in westerly flow from a shortwave trough over the northern
Gulf of Mexico. The storm should then turn northeastward and
accelerate on Tuesday and Wednesday toward the Florida Peninsula.
As a result of this re-positioning and initial motion, there's been
a southward change to most of the guidance this morning. The new
NHC forecast is adjusted south of the previous one, especially early
on, and further southward adjustments could be required if the
guidance trend continues. The Mexican government has issued a
Tropical Storm Warning for the north coast of the Yucatan Peninsula
as a result of the forecast change. It should be noted that the
average NHC track error at day 3 is around 100 miles, and users
should not focus on the exact track.
The NOAA Hurricane Hunter crew reported that an eyewall has formed
on the last center fix, suggesting that this system is ready to
intensify quickly. Given the track over the very deep warm waters
of the Gulf of Mexico and little shear for the next couple of days,
rapid intensification is explicitly forecast, and the new NHC
prediction could still be conservative over the central Gulf of
Mexico. The biggest question actually seems to be the intensity as
Milton approaches Florida, with much of the guidance showing a
notable increase in shear. While some weakening is anticipated,
the shear could help transition Milton to be a large hurricane at
landfall, with impacts spread out over a big area. Regardless of
the details, there is increasing confidence that a powerful
hurricane with life-threatening hazards will be affecting portions
of the Florida west coast around the middle of this week. Residents
there should closely monitor this system and listen to local
officials.
Key Messages:
1. Milton is forecast to quickly intensify while it moves eastward
to northeastward across the Gulf of Mexico and be a major hurricane
when it reaches the west coast of the Florida Peninsula mid week.
Users are reminded to not focus on the details of the forecast as
there remains significant uncertainty in the eventual track and
intensity of Milton.
2. While it is too soon to specify the exact magnitude and location
of the greatest impacts, there is an increasing risk of
life-threatening storm surge and damaging winds for portions of the
west coast of the Florida Peninsula beginning Tuesday night or early
Wednesday. Storm Surge and Hurricane Watches could be issued later
today or tonight. Residents in the Florida Peninsula should follow
any advice given by local officials and check back for updates to
the forecast.
3. Areas of heavy rainfall will impact portions of Florida today
and Monday well ahead of Milton, with heavy rainfall more directly
related to the system expected later on Tuesday through Wednesday
night. This rainfall will bring the risk of flash, urban, and areal
flooding, along with the potential of moderate to major river
flooding.
4. Tropical storm conditions are expected beginning Monday across
portions of the northern Yucatan Peninsula of Mexico where a
Tropical Storm Warning is in effect.
FORECAST POSITIONS AND MAX WINDS
INIT 06/1500Z 22.4N 94.4W 55 KT 65 MPH
12H 07/0000Z 22.2N 93.7W 65 KT 75 MPH
24H 07/1200Z 22.2N 92.0W 85 KT 100 MPH
36H 08/0000Z 22.5N 90.0W 100 KT 115 MPH
48H 08/1200Z 23.5N 88.0W 110 KT 125 MPH
60H 09/0000Z 24.7N 86.0W 110 KT 125 MPH
72H 09/1200Z 26.5N 84.0W 105 KT 120 MPH
96H 10/1200Z 29.0N 79.0W 75 KT 85 MPH
120H 11/1200Z 31.0N 72.0W 55 KT 65 MPH...POST-TROP/EXTRATROP
$$
Forecaster Blake