irma

Irma Update Plus Late Week Weekend Sunshine Locally

Irma Update Plus Late Week Weekend Sunshine Locally

irma

 

Irma Update Plus Late Week Weekend Sunshine Locally

Locally we have some more work today tonight with this stalled front along the East Coast that has been producing rain and occasionally heavy downpours along with some dry periods in between. There is still more moisture riding up the coast as the last in a series of waves develops and moves northward. Some areas could see another 1/2 inch to an inch of rain overnight before everything shifts to the east. The rain should end during the early morning hours from west to east with temperatures cooling off into the 50s to near 60 by morning.

SATELLITE LOOP

storm free

REGIONAL RADAR

storm free

Regional & local radars remain busy to the south and west and for now the back edge of the rain has not made much eastward progress. There are some heavier downpours and a few isolated thunderstorms in the mix as well.

LOCAL RADAR NEW YORK CITY

storm free

LOCAL RADAR PHILADELPHIA
storm free

There might be a few leftover clouds early on Thursday but we should go to sunshine before too long. Most of the day should be no worse than partly sunny with temperatures in the 70s. Friday through Sunday will be terrific with lots of sunshine and cool conditions with highs just into the 70s with nighttime lows in the 40s in many inland locations while warmer urban areas will average in the low 50s. It will be very cool September weekend with that autumn feel.

HURRICANE IRMA SETS RECORDS AS A CATEGORY 5 HURRICANE

Hurricane Irma is the strongest Atlantic Ocean hurricane on record on both pressure & wind, 913 millibars & winds of 185 mph. 

Hurricane Irma is the strongest hurricane to hit the Leeward Islands on record.

Hurricane Irma has been a category 5 hurricane for almost 36 hours and counting. Irma has maintained 185 mph winds, category 5 strength longer than any other hurricane on record in either the Atlantic the Eastern Pacific

Hurricane Irma Advisory Number 31
NWS National Hurricane Center Miami FL AL112017
500 PM AST Wed Sep 06 2017

…EYE OF CATEGORY 5 HURRICANE IRMA MOVING AWAY FROM THE
NORTHERNMOST VIRGIN ISLANDS…
…TROPICAL STORM AND HURRICANE CONDITIONS SPREADING OVER PORTIONS
OF PUERTO RICO…

 

SUMMARY OF 500 PM AST…2100 UTC…INFORMATION
———————————————-
LOCATION…18.8N 65.4W
ABOUT 40 MI…60 KM NW OF ST. THOMAS
ABOUT 55 MI…85 KM ENE OF SAN JUAN PUERTO RICO
MAXIMUM SUSTAINED WINDS…185 MPH…295 KM/H
PRESENT MOVEMENT…WNW OR 285 DEGREES AT 16 MPH…26 KM/H
MINIMUM CENTRAL PRESSURE…914 MB…26.99 INCHES

 

WATCHES AND WARNINGS
——————–
CHANGES WITH THIS ADVISORY:

The government of the Bahamas has issued a Hurricane Warning for
the central Bahamas, including Cat Island, the Exumas, Long Island,
Rum Cay, and San Salvador. A Hurricane Watch has been issued for
the northwestern Bahamas, including the Abacos, Andros Island,
Berry Islands, Bimini, Eleuthera, Grand Bahama Island, and New
Providence.

The government of Cuba has issued a Tropical Storm Warning for the
Cuban provinces of Guantanamo, Holguin, and Las Tunas.

The government of France has discontinued the Hurricane Warning for
Saint Martin and Saint Barthelemy.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Hurricane Warning is in effect for…
* British Virgin Islands
* U.S. Virgin Islands
* Puerto Rico, Vieques, and Culebra
* Dominican Republic from Cabo Engano to the northern border with
Haiti
* Haiti from the northern border with the Dominican Republic to Le
Mole St. Nicholas
* Southeastern Bahamas and the Turks and Caicos Islands
* Central Bahamas

A Hurricane Watch is in effect for…
* Cuba from Matanzas province eastward to Guantanamo province
* Northwestern Bahamas

A Tropical Storm Warning is in effect for…
* Dominican Republic from south of Cabo Engano westward to the
southern border with Haiti
* Haiti from south of Le Mole St. Nicholas to Port-Au-Prince
* Cuba provinces of Guantanamo, Holguin, and Las Tunas

A Hurricane Warning means that hurricane conditions are expected
somewhere within the warning area. Preparations to protect life and
property should be rushed to completion.

A Hurricane Watch means that hurricane conditions are possible
within the watch area. A watch is typically issued 48 hours
before the anticipated first occurrence of tropical-storm-force
winds, conditions that make outside preparations difficult or
dangerous.

A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area.

Interests elsewhere in the Dominican Republic and Haiti, as well as
Cuba, the northwestern Bahamas, and Florida should monitor the
progress of Irma.

For storm information specific to your area in the United
States, including possible inland watches and warnings, please
monitor products issued by your local National Weather Service
forecast office. For storm information specific to your area
outside the United States, please monitor products issued by your
national meteorological service.

 

DISCUSSION AND 48-HOUR OUTLOOK
——————————
At 500 PM AST (2100 UTC), the eye of Hurricane Irma was located
near latitude 18.8 North, longitude 65.4 West. Irma is moving
toward the west-northwest near 16 mph (26 km/h), and this general
motion is expected to continue for the next couple of days. On the
forecast track, the extremely dangerous core of Irma will pass just
north of Puerto Rico tonight, pass near or just north of the coast
of Hispaniola Thursday, and be near the Turks and Caicos and
southeastern Bahamas by Thursday evening.

Maximum sustained winds are near 185 mph (295 km/h) with higher
gusts. Irma is a category 5 hurricane on the Saffir-Simpson
Hurricane Wind Scale. Some fluctuations in intensity are likely
during the next day or two, but Irma is forecast to remain a
powerful category 4 or 5 hurricane during the next couple of days.

Hurricane-force winds extend outward up to 50 miles (85 km) from the
center and tropical-storm-force winds extend outward up to 185 miles
(295 km). A wind gust to 62 mph (100 km/h) has been recently
reported at San Juan, Puerto Rico.

The estimated minimum central pressure based on Air Force
reconnaissance aircraft data is 914 mb (26.99 inches).

 

HAZARDS AFFECTING LAND
———————-
STORM SURGE: The combination of a life-threatening storm surge and
large breaking waves will raise water levels ABOVE NORMAL TIDE
LEVELS by the following amounts within the hurricane warning area
near and to the north of the center of Irma. Near the coast, the
surge will be accompanied by large and destructive waves.

Turks and Caicos Islands…15 to 20 ft
Southeastern and central Bahamas…15 to 20 ft
Northern coast of the Dominican Republic…3 to 5 ft
Northern coast of Haiti and the Gulf of Gonave…1 to 3 ft
Northern coast of Cuba in the warning area…5 to 10 ft

Water levels in the Leeward Islands will gradually subside tonight.

The combination of a life-threatening 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…

British and U.S. Virgin Islands except St. Croix…7 to 11 ft
Northern coast of Puerto Rico…4 to 6 ft
Southern coast of Puerto Rico and St. Croix…2 to 4 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
office.

WIND: Tropical Storm and Hurricane conditions are occurring over
the British and U.S. Virgin Islands and will spread westward over
portions of Puerto Rico tonight. Hurricane conditions are expected
to begin within the hurricane warning area in the Dominican Republic
and Haiti early Thursday, with tropical storm conditions beginning
tonight. Hurricane conditions are expected to begin in the warning
area in the southeastern Bahamas and the Turks and Caicos Islands on
Thursday with tropical storm conditions by late tonight. These
conditions will spread into the Central Bahamas by Thursday night.

Hurricane and tropical storm conditions are possible within the
watch area in the central Bahamas and Cuba by Friday. Tropical
storm conditions are expected to begin within the warning area in
Cuba Thursday night.

RAINFALL: Irma is expected to produce the following rain
accumulations through Saturday:

Northern Leeward Islands…Additional 1 to 3 inches. Storm total 8
to 12 inches, isolated 20 inches.
Northeast Puerto Rico and the British and U.S. Virgin Islands…6 to
12 inches, isolated 20 inches.
Southwest Puerto Rico…3 to 6 inches, isolated 10 inches.
The Southern Leeward Islands, and Saint Croix…2 to 4 inches.
Southeast Bahamas, Central Bahamas, and the Turks and Caicos…8 to
12 inches, isolated 20 inches.
Northern Dominican Republic and northern Haiti…4 to 10 inches,
isolated 15 inches.
Eastern and Central Cuba…4 to 10 inches, isolated 15 inches.
Southwest Haiti…1 to 4 inches.

In all areas this rainfall may cause life-threatening flash floods
and mudslides.

SURF: Swells generated by Irma will affect the northern Leeward
Islands, Puerto Rico, the Virgin Islands, the southeastern Bahamas,
the Turks and Caicos Islands, the northern coast of the Dominican
Republic, and portions of the southeast coast of the United States
during the next several days. 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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