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Subtropical Storm Alberto is expected to make landfall later today on the Florida Panhandle. It has 65 MPH (100 KM/H) winds. Tropical Storm force winds are 39 to 73 mph, and Hurricane force winds are 74 mph and greater. “Winds of 40 mph extend outward up to 105 miles (165 km) from the center“.
A non-frontal low pressure system that has characteristics of both tropical and extratropical cyclones. Subtropical cyclones originate over tropical or subtropical waters and have a closed circulation about a well-defined center. In comparison to tropical cyclones, the maximum winds occur relatively far from the center (greater than 60 nautical miles) and have a less symmetric wind field and distribution of convection.” https://www.weather.gov/mob/tropical_definitions
WTNT31 KNHC 280843
Subtropical Storm Alberto Advisory Number 13
NWS National Hurricane Center Miami FL AL012018
400 AM CDT Mon May 28 2018
…ALBERTO HOLDING 65-MPH WINDS…
…EXPECTED TO MAKE LANDFALL LATER TODAY…
SUMMARY OF 400 AM CDT…0900 UTC…INFORMATION
ABOUT 125 MI…200 KM S OF DESTIN FLORIDA
MAXIMUM SUSTAINED WINDS…65 MPH…100 KM/H
PRESENT MOVEMENT…NW OR 315 DEGREES AT 7 MPH…11 KM/H
MINIMUM CENTRAL PRESSURE…990 MB…29.24 INCHES
WATCHES AND WARNINGS
CHANGES WITH THIS ADVISORY:
The Storm Surge Watch south of Suwannee River has been discontinued.
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:
A Storm Surge Watch is in effect for…
* Suwannee River to Navarre Florida
A Tropical Storm Warning is in effect for…
* Suwannee River to the Mississippi/Alabama border
A Storm Surge Watch means there is a possibility of life-
threatening inundation, from rising water moving inland from the
coastline, in the indicated locations. For a depiction of areas at
risk, please see the National Weather Service Storm Surge
Watch/Warning Graphic, available at hurricanes.gov.
A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area.
For storm information specific to your area, including possible
inland watches and warnings, please monitor products issued by your
local National Weather Service forecast office.
DISCUSSION AND OUTLOOK
At 400 AM CDT (0900 UTC), the center of Subtropical Storm Alberto
was located near latitude 28.6 North, longitude 86.2 West. The
storm has slowed down recently, but a longer-term motion is to
the northwest near 7 mph (11 km/h). A faster north-northwestward to
northward motion is expected during the next few days. On the
forecast track, the center of Alberto will cross the northern Gulf
Coast in the warning area this afternoon or evening. The weakening
system is forecast to move well inland into the Tennessee Valley on
Tuesday and into the Ohio Valley and Great Lakes region on Wednesday
Maximum sustained winds remain near 65 mph (100 km/h) with higher
gusts. Little change in strength is expected before Alberto reaches
the northern Gulf Coast later today. Steady weakening is forecast
after landfall, and Alberto will likely become a subtropical
depression tonight or early Tuesday and degenerate into a remnant
low by Tuesday afternoon.
Winds of 40 mph extend outward up to 105 miles (165 km) from the
The estimated minimum central pressure is 990 mb (29.24 inches).
HAZARDS AFFECTING LAND
RAINFALL: Alberto is expected to produce the following rain
accumulations through Tuesday:
Central Cuba…Additional 5 to 10 inches, isolated storm-totals of
20 to 25 inches.
The Florida panhandle into much of Alabama and western Georgia…4
to 8 inches, isolated 12 inches.
The Florida Keys and Florida peninsula…Additional 1 to 4 inches,
isolated 10 inches.
Rest of the Southeast and Tennessee Valley into the lower mid
Atlantic from Tennessee east through the Carolinas…2 to 6 inches.
Rains in Cuba could produce life-threatening flash floods and
mudslides. Flooding and flash flooding are possible in the
southeast United States, including Florida.
WIND: Tropical storm conditions will spread across the warning area
throughout the day.
STORM SURGE: The combination of storm surge and the tide will cause
normally dry areas near the coast to be flooded by rising waters
moving inland from the shoreline. The water could reach the
following heights above ground somewhere in the indicated
areas if the peak surge occurs at the time of high tide…
Suwannee River to Navarre Florida…2 to 4 ft
The deepest water will occur along the immediate coast. Surge-
related flooding depends on the relative timing of the surge
and the tidal cycle, and can vary greatly over short distances. For
information specific to your area, please see products issued by
your local National Weather Service forecast office.
TORNADOES: A couple of brief tornadoes are possible today from
northern Florida into central and southern Georgia, southern South
Carolina, and southeastern Alabama.
SURF: Swells generated by Alberto will continue to affect the
eastern and northern Gulf Coast through Tuesday. These swells are
likely to cause life-threatening surf and rip current conditions.
For more information, consult products from your local weather
Next intermediate advisory at 700 AM CDT.
Next complete advisory at 1000 AM CDT.
Forecaster Cangialosi” https://www.nhc.noaa.gov/text/refresh/MIATCPAT1+shtml/280843.shtml