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The Saffir-Simpson Hurricane Scale is a 1-5 rating based on the hurricane's present intensity. This is used to give an estimate of the potential property damage and flooding expected along the coast from a hurricane landfall. Wind speed is the determining factor in the scale, as storm surge values are highly dependent on the slope of the continental shelf in the landfall region. Note that all winds are using the U.S. 1-minute average.

CATEGORY ONE HURRICANE: Winds 74-95 mph (64-82 kt or 119-153 kph). Storm surge generally 4-5 feet above normal. No real damage to building structures. Damage primarily to unanchored mobile homes, shrubbery, and trees. Some damage to poorly constructed signs. Also, some coastal road flooding and minor pier damage. Hurricanes Allison of 1995 and Danny of 1997 were Category One hurricanes at peak intensity.

CATEGORY TWO HURRICANE: Winds 96-110 mph (83-95 kt or 154-177 kph). Storm surge generally 6-8 feet above normal. Some roofing material, door, and window damage of buildings. Considerable damage to shrubbery and trees with some trees blown down. Considerable damage to mobile homes, poorly constructed signs, and piers. Coastal and low-lying escape routes flood 2-4 hours before arrival of the hurricane center. Small craft in unprotected anchorages break moorings. Hurricane Bonnie of 1998 was a Category Two hurricane when it hit the North Carolina coast, while Hurricane Georges of 1998 was a Category Two Hurricane when it hit the Florida Keys and the Mississippi Gulf Coast.

CATEGORY THREE HURRICANE: Winds 111-130 mph (96-113 kt or 178-209 kph). Storm surge generally 9-12 feet above normal. Some structural damage to small residences and utility buildings with a minor amount of curtainwall failures. Damage to shrubbery and trees with foliage blown off trees and large tress blown down. Mobile homes and poorly constructed signs are destroyed. Low-lying escape routes are cut by rising water 3-5 hours before arrival of the hurricane center. Flooding near the coast destroys smaller structures with larger structures damaged by battering of floating debris. Terrain continuously lower than 5 feet above mean sea level may be flooded inland 8 miles (13 km) or more. Evacuation of low-lying residences with several blocks of the shoreline may be required. Hurricanes Roxanne of 1995 and Fran of 1996 were Category Three hurricanes at landfall on the Yucatan Peninsula of Mexico and in North Carolina, respectively.

CATEGORY FOUR HURRICANE: Winds 131-155 mph (114-135 kt or 210-249 kph). Storm surge generally 13-18 feet above normal. More extensive curtainwall failures with some complete roof structure failures on small residences. Shrubs, trees, and all signs are blown down. Complete destruction of mobile homes. Extensive damage to doors and windows. Low-lying escape routes may be cut by rising water 3-5 hours before arrival of the hurricane center. Major damage to lower floors of structures near the shore. Terrain lower than 10 ft above sea level may be flooded requiring massive evacuation of residential areas as far inland as 6 miles (10 km). Hurricane Luis of 1995 was a Category Four hurricane while moving over the Leeward Islands. Hurricanes Felix and Opal of 1995 also reached Category Four status at peak intensity.

CATEGORY FIVE HURRICANE: Winds greater than 155 mph (135 kt or 249 kph). Storm surge generally greater than 18 feet above normal. Complete roof failure on many residences and industrial buildings. Some complete building failures with small utility buildings blown over or away. All shrubs, trees, and signs blown down. Complete destruction of mobile homes. Severe and extensive window and door damage. Low-lying escape routes are cut by rising water 3-5 hours before arrival of the hurricane center. Major damage to lower floors of all structures located less than 15 feet above sea level and within 500 yards of the shoreline. Massive evacuation of residential areas on low ground within 5-10 miles (8-16 km) of the shoreline may be required. Hurricane Mitch of 1998 was a Category Five hurricane at peak intensity over the western Caribbean. Hurricane Gilbert of 1988 was a Category Five hurricane at peak intensity and is the strongest Atlantic tropical cyclone of record.

Quoted from the National Hurricane Center , Tropical Prediction Center.

 

All hurricanes are dangerous, but some are more so than others. The way storm surge, wind, and other factors combine determines the hurricane's destructive power. To make comparisons easier, and to make the predicted hazards of approaching hurricanes clearer, NOAA's hurricane forecasters use a disaster-potential scale, which assigns storms to five categories. Category 1 is a minimum hurricane and category 5 is the worst case. The criteria for each category are shown below.


CATE-   CENTRAL PRESSURE        WINDS      SURGE     EXAMPLE
GORY   (milli-   (inches)       (mph)      (ft)   DAMAGE    STORM
        bars)

1      980 or    less than      74-95      4-5    minimal   Agnes 1972, Ismael 1995, 
       greater   or = 28.94                                 Danny 1997, Gaston 2004, 
                                                            Stan 2005

2      965-979   28.50-28.91    96-110     6-8    moderate  Kate 1965, Fifi 1974, 
                                                            Diana 1990, Erin 1995,
                                                            Juan 2003, Wilma 2005

3      945-964   27.91-28.47    111-130    9-12   extensive Elena 1985, Alicia 1983
                                                            Roxanne 1995, Fran 1996,
                                                            Isidore 2002, Jeanne 2004

4      920-944   27.17-27.88    131-155    13-18  extreme   "Galveston" 1990, 
                                                            Hazel 1954, Iniki 1992, 
                                                            Hugo 1989, Iris 2001,
                                                            Charley 2004

5      less        less          more      more   cata-     "LABOR DAY
       than        than          than      than   strophic  STORM" 1935, Luis 1995,
       920         27.17         155       18               Gilbert 1988, Andrew 1992
                                                          
	   

 


Hurricane & Tropical Storm

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Advisory


NHC Atlantic

Active tropical cyclones in the Atlantic, Caribbean, and the Gulf of Mexico

Atlantic Tropical Weather Outlook-
715
ABNT20 KNHC 152344
TWOAT

Tropical Weather Outlook
NWS National Hurricane Center Miami FL
800 PM EDT Wed Aug 15 2018

For the North Atlantic...Caribbean Sea and the Gulf of Mexico:

The National Hurricane Center is issuing advisories Subtropical
Storm Ernesto located several hundred miles southeast of Cape Race,
Newfoundland.

A tropical wave located about 850 miles east-southeast of the
Windward Islands is producing a large area of cloudiness and
thunderstorms. Slow development of this disturbance is possible over
the next few days while the system moves west-northwestward at 15 to
20 mph. By early next week, however, upper-level winds are expected
to become less conducive for any significant development to occur
when the system will be moving over the eastern Caribbean Sea.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 5 days...low...20 percent.

&&
Public Advisories on Subtropical Storm Ernesto are issued under
WMO header WTNT35 KNHC and under AWIPS header MIATCPAT5.
Forecast/Advisories on Subtropical Storm Ernesto are issued under
WMO header WTNT25 KNHC and under AWIPS header MIATCMAT5.

$$
Forecaster Stewart



Summary for Subtropical Storm Ernesto (AT5/AL052018)- ...ERNESTO MOVING NORTH-NORTHEASTWARD OVER THE NORTH-CENTRAL ATLANTIC... As of 11:00 PM AST Wed Aug 15 the center of Ernesto was located near 39.7, -45.1 with movement NNE at 10 mph. The minimum central pressure was 1008 mb with maximum sustained winds of about 40 mph.

Subtropical Storm Ernesto Public Advisory Number 4-Issued at 1100 PM AST Wed Aug 15 2018
ZCZC MIATCPAT5 ALL
TTAA00 KNHC DDHHMM

BULLETIN
Subtropical Storm Ernesto Advisory Number   4
NWS National Hurricane Center Miami FL       AL052018
1100 PM AST Wed Aug 15 2018

...ERNESTO MOVING NORTH-NORTHEASTWARD OVER THE NORTH-CENTRAL
ATLANTIC...


SUMMARY OF 1100 PM AST...0300 UTC...INFORMATION
-----------------------------------------------
LOCATION...39.7N 45.1W
ABOUT 630 MI...1010 KM SE OF CAPE RACE NEWFOUNDLAND
MAXIMUM SUSTAINED WINDS...40 MPH...65 KM/H
PRESENT MOVEMENT...NNE OR 25 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...1008 MB...29.77 INCHES


WATCHES AND WARNINGS
--------------------
There are no coastal watches or warnings in effect.


DISCUSSION AND OUTLOOK
----------------------
At 1100 PM AST (0300 UTC), the center of Subtropical Storm Ernesto
was located near latitude 39.7 North, longitude 45.1 West. The storm
is moving toward the north-northeast near 10 mph (17 km/h). A turn
toward the northeast with an increase in forward speed is forecast
tonight and early Thursday, with that motion continuing through
Saturday.

Maximum sustained winds remain near 40 mph (65 km/h) with higher
gusts. Little change in strength is forecast during the next 24
hours. Ernesto is expected to become a post-tropical cyclone
Thursday night or early Friday, and merge with a frontal zone near
Ireland and the United Kingdom on Saturday.

Winds of 40 mph extend outward up to 160 miles (260 km) from the
center.

The estimated minimum central pressure is 1008 mb (29.77 inches).


HAZARDS AFFECTING LAND
----------------------
None.


NEXT ADVISORY
-------------
Next complete advisory at 500 AM AST.

$$
Forecaster Stewart

NNNN


Subtropical Storm Ernesto Forecast Advisory Number 4-Issued at 0300 UTC THU AUG 16 2018

232 
WTNT25 KNHC 160233
TCMAT5

SUBTROPICAL STORM ERNESTO FORECAST/ADVISORY NUMBER   4
NWS NATIONAL HURRICANE CENTER MIAMI FL       AL052018
0300 UTC THU AUG 16 2018

THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT.

SUBTROPICAL STORM CENTER LOCATED NEAR 39.7N  45.1W AT 16/0300Z
POSITION ACCURATE WITHIN  20 NM

PRESENT MOVEMENT TOWARD THE NORTH-NORTHEAST OR  25 DEGREES AT   9 KT

ESTIMATED MINIMUM CENTRAL PRESSURE 1008 MB
MAX SUSTAINED WINDS  35 KT WITH GUSTS TO  45 KT.
34 KT.......120NE 140SE   0SW   0NW.
12 FT SEAS..120NE 160SE   0SW   0NW.
WINDS AND SEAS VARY GREATLY IN EACH QUADRANT.  RADII IN NAUTICAL
MILES ARE THE LARGEST RADII EXPECTED ANYWHERE IN THAT QUADRANT.

REPEAT...CENTER LOCATED NEAR 39.7N  45.1W AT 16/0300Z
AT 16/0000Z CENTER WAS LOCATED NEAR 39.3N  45.4W

FORECAST VALID 16/1200Z 41.3N  43.4W
MAX WIND  40 KT...GUSTS  50 KT.
34 KT...120NE 140SE   0SW   0NW.

FORECAST VALID 17/0000Z 43.7N  40.0W
MAX WIND  40 KT...GUSTS  50 KT.
34 KT...120NE 140SE   0SW   0NW.

FORECAST VALID 17/1200Z 46.3N  34.9W...POST-TROPICAL
MAX WIND  40 KT...GUSTS  50 KT.
34 KT... 90NE 140SE  80SW   0NW.

FORECAST VALID 18/0000Z 49.0N  27.9W...POST-TROP/EXTRATROP
MAX WIND  40 KT...GUSTS  50 KT.
34 KT... 70NE 150SE 120SW   0NW.

FORECAST VALID 19/0000Z 54.0N  12.1W...POST-TROP/EXTRATROP
MAX WIND  40 KT...GUSTS  50 KT.
34 KT...  0NE 150SE 120SW   0NW.

EXTENDED OUTLOOK. NOTE...ERRORS FOR TRACK HAVE AVERAGED NEAR 150 NM
ON DAY 4 AND 175 NM ON DAY 5...AND FOR INTENSITY NEAR 15 KT EACH DAY

OUTLOOK VALID 20/0000Z...DISSIPATED

REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 39.7N  45.1W

NEXT ADVISORY AT 16/0900Z

$$
FORECASTER STEWART





Subtropical Storm Ernesto Forecast Discussion Number 4-Issued at 1100 PM AST Wed Aug 15 2018

844 
WTNT45 KNHC 160234
TCDAT5

Subtropical Storm Ernesto Discussion Number   4
NWS National Hurricane Center Miami FL       AL052018
1100 PM AST Wed Aug 15 2018

Although inner-core convection has increased since the previous
advisory, outer banding features have become more fragmented and
the overall cloud pattern has become elongated north-to-south.
There are also no signs of any upper-level anticyclonic outflow,
an indication that Ernesto is still a subtropical cyclone. The
initial intensity is being maintained at 35 kt based on a 2328Z
ASCAT pass that showed peak winds of 32 kt in the southeastern
quadrant, along with a radius of maximum winds of 70-80 nmi. This
intensity is consistent with a ST2.5/35 kt classification from TAFB.

The initial motion is now north-northeastward or 025/09 kt. Ernesto
has rounded the subtropical ridge axis to its south, and the
cyclone should gradually get caught up in the mid-latitude
westerlies and turn northeastward during the next 12 hours or so.
A northeastward motion along with a steadily increasing forward
speed is expected through Friday. The track guidance is tightly
packed around the previous advisory track, so the new NHC forecast
track is essentially just an extension of the previous advisory, and
lies near the track consensus models HCCA and TVCN.  On the forecast
track, Ernesto is expected to approach Ireland as an extratropical
gale area on Saturday.

Ernesto is expected to remain over sea-surface temperatures (SST)
of 25 deg C or warmer for the next 18-24 hours, along with low
vertical shear conditions of less than 10 kt. These conditions
should allow for some slight strengthening during that short time
window. By 36 hours, Ernesto is forecast to be moving over SSTs of
20 deg C and colder and into a more stable airmass, resulting in a
degeneration of the inner-core convection. As a result, Ernesto is
expected to become a post-tropical cyclone by 36 hours, and become
an extratropical gale area after merging with a frontal zone near
Ireland and the United Kingdom in about 3 days.

FORECAST POSITIONS AND MAX WINDS

INIT  16/0300Z 39.7N  45.1W   35 KT  40 MPH
 12H  16/1200Z 41.3N  43.4W   40 KT  45 MPH
 24H  17/0000Z 43.7N  40.0W   40 KT  45 MPH
 36H  17/1200Z 46.3N  34.9W   40 KT  45 MPH...POST-TROPICAL
 48H  18/0000Z 49.0N  27.9W   40 KT  45 MPH...POST-TROP/EXTRATROP
 72H  19/0000Z 54.0N  12.1W   40 KT  45 MPH...POST-TROP/EXTRATROP
 96H  20/0000Z...DISSIPATED

$$
Forecaster Stewart




Subtropical Storm Ernesto Wind Speed Probabilities Number 4-Issued at 0300 UTC THU AUG 16 2018

204 
FONT15 KNHC 160233
PWSAT5
                                                                    
SUBTROPICAL STORM ERNESTO WIND SPEED PROBABILITIES NUMBER   4       
NWS NATIONAL HURRICANE CENTER MIAMI FL       AL052018               
0300 UTC THU AUG 16 2018                                            
                                                                    
AT 0300Z THE CENTER OF SUBTROPICAL STORM ERNESTO WAS LOCATED NEAR   
LATITUDE 39.7 NORTH...LONGITUDE 45.1 WEST WITH MAXIMUM SUSTAINED    
WINDS NEAR 35 KTS...40 MPH...65 KM/H.                               
                                                                    
Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH)                  
   ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME      
   EASTERN  DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME      
   CENTRAL  DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME      
                                                                    
WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS                 
                                                                    
CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST     
   ...34 KT (39 MPH... 63 KM/H)...                                  
   ...50 KT (58 MPH... 93 KM/H)...                                  
   ...64 KT (74 MPH...119 KM/H)...                                  
FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS               
                                                                    
PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE               
    OP  IS THE PROBABILITY OF THE EVENT BEGINNING DURING            
        AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY)               
   (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN           
        00Z THU AND THE FORECAST HOUR (CUMULATIVE PROBABILITY)      
                                                                    
PROBABILITIES ARE GIVEN IN PERCENT                                  
X INDICATES PROBABILITIES LESS THAN 1 PERCENT                       
PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN
THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT.             
PROBABILITIES FOR 34...50...64 KT SHOWN WHEN THE 5-DAY              
64-KT CUMULATIVE PROBABILITY IS AT LEAST 1 PERCENT.                 
                                                                    
                                                                    
  - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - -   
                                                                    
               FROM    FROM    FROM    FROM    FROM    FROM    FROM 
  TIME       00Z THU 12Z THU 00Z FRI 12Z FRI 00Z SAT 00Z SUN 00Z MON
PERIODS         TO      TO      TO      TO      TO      TO      TO  
             12Z THU 00Z FRI 12Z FRI 00Z SAT 00Z SUN 00Z MON 00Z TUE
                                                                    
FORECAST HOUR    (12)   (24)    (36)    (48)    (72)    (96)   (120)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
LOCATION       KT                                                   
                                                                    
$$                                                                  
FORECASTER STEWART                                                  



Subtropical Storm Ernesto Graphics- Subtropical Storm Ernesto 5-Day Uncertainty Track Image
5-Day Uncertainty Track last updated Thu, 16 Aug 2018 02:35:29 GMT

Subtropical Storm Ernesto 34-Knot Wind Speed Probabilities
Wind Speed Probabilities last updated Thu, 16 Aug 2018 03:22:06 GMT
::
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The hurricane and tropical cyclone information displayed here is based on the latest NOAA, NHC, NASA and other official reports received here and may or may not be the most current forecast available from these official forecasting agencies. We attempt to keep everything current, but remember to use this as a supplement to official sources. This information is for the general public's viewing, but Hurricane.com is not responsible for its ultimate use in the forecasting of tropical cyclones and/or the use of public watches/warnings. Customers should confirm these prognostications with official sources (see our links section) and follow local recommendations. Our advice is to always plan for the worst and get out of the way of a storm! Use of this site constitutes acceptance of these terms. One should always rely on OFFICIAL SOURCES. Email can be delayed or not delivered, servers may not be available 24 hours per day, seven days a week. Official forecasts are available via NOAA Weather Radio, NOAA Weather Wire, NOAAPORT, your local National Weather Service office and more. Use of information is at your own risk and can not be guaranteed.Please note that data and material from the National Hurricane Center and the NOAA is not subject to copyright.