800 am EDT Mon Sep 11 - 70 mph - NNW at 18 mph - 970 mb
Posted by cypresstx
on 9/11/2017, 8:07 am
DISCUSSION AND 48-HOUR OUTLOOK
At 800 AM EDT (1200 UTC), the center of Tropical Storm Irma was
located near latitude 29.5 North, longitude 82.9 West. Irma is
moving toward the north-northwest near 18 mph (30 km/h) and this
motion is expected to continue through Tuesday. On the forecast
track, the center of Irma will move near the northwestern coast of
the Florida Peninsula this morning, cross the eastern Florida
Panhandle into southern Georgia this afternoon, and move through
southwestern Georgia and eastern Alabama tonight and Tuesday.
Maximum sustained winds have decreased to near 70 mph (110 km/h)
with higher gusts. Additional slow weakening is forecast, and Irma
is expected to weaken to a tropical depression by Tuesday afternoon.
Irma has a very large wind field. Hurricane-force winds extend
outward up to 60 miles (95 km) mainly to the west of the center, and
tropical-storm-force winds extend outward up to 415 miles (665 km).
The estimated minimum central pressure is 970 mb (28.64 inches).
HAZARDS AFFECTING LAND
STORM SURGE: The combination of a dangerous 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 is
expected to reach the following HEIGHTS ABOVE GROUND if the peak
surge occurs at the time of high tide...
Cape Sable to Captiva...2 to 4 ft
Captiva to Anna Maria Island...3 to 5 ft
North Miami Beach to Cape Sable, including the Florida Keys...1 to 2
Anna Maria Island to Clearwater, including Tampa Bay...2 to 4 ft
South Santee River to Fernandina Beach...4 to 6 ft
Clearwater Beach to Ochlockonee River...4 t 6 ft
Fernandina Beach to Jupiter Inlet...3 to 5 ft
The deepest water will occur along the immediate coast in areas of
onshore winds, where the surge will be accompanied by large and
destructive waves. 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
WIND: Tropical storm conditions will continue across portions of the
central and northern Florida peninsula, and are spreading into
southern Georgia. Tropical storm conditions should spread into the
eastern Florida Panhandle today. Tropical storm conditions are also
expected to spread northward across the remainder of the warning
areas through today.
Rainfall: Irma is expected to produce the following rain
accumulations through Wednesday:
The Florida Keys and southern Florida peninsula: additional 1 inch.
Central Florida peninsula: additional 1 to 3 inches.
Northern Florida peninsula and southern Georgia: additional 3 to 6
inches with storm total amounts of 8 to 15 inches.
Central Georgia, eastern Alabama and southern South Carolina: 3 to
inches, isolated 10 inches.
Central Florida Panhandle, western Alabama, northern Mississippi,
southern Tennessee, northern Georgia, northern South Carolina and
western North Carolina: 2 to 4 inches.
TORNADOES: A few tornadoes are possible across northeast Florida
and southeast portions of Georgia and South Carolina through
SURF: Swells generated by Irma are affecting the southeast coast of
the United States. These swells are likely to cause life-
threatening surf and rip current conditions. Please consult
products from your local weather office.
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800 am EDT Mon Sep 11 - 70 mph - NNW at 18 mph - 970 mb - cypresstx, 9/11/2017, 8:07 am< Return to message board
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