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Expires:No;;733681
WTNT33 KNHC 161442
TCPAT3

BULLETIN
Post-Tropical Cyclone Helene Advisory Number  37
NWS National Hurricane Center Miami FL       AL082018
1100 AM AST Sun Sep 16 2018

...HELENE NOW A POST-TROPICAL CYCLONE...
...THIS IS THE LAST ADVISORY...


SUMMARY OF 1100 AM AST...1500 UTC...INFORMATION
-----------------------------------------------
LOCATION...43.8N 25.7W
ABOUT 405 MI...655 KM N OF THE AZORES
MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H
PRESENT MOVEMENT...NE OR 55 DEGREES AT 29 MPH...46 KM/H
MINIMUM CENTRAL PRESSURE...989 MB...29.21 INCHES


WATCHES AND WARNINGS
--------------------
SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

None.

Interests in Ireland and the United Kingdom should consult products
from their local meteorological service for information about
potential impacts from Post-Tropical Helene in those locations.
Local forecasts and warnings for the UK can be found on the website
of the UK Met Office at https://www.metoffice.gov.uk/.  Local
forecasts and warnings for Ireland can be found on the website of
Met Eireann at https://www.met.ie/.


DISCUSSION AND OUTLOOK
----------------------
At 1100 AM AST (1500 UTC), the center of Post-Tropical Cyclone
Helene was located near latitude 43.8 North, longitude 25.7 West.
The post-tropical cyclone is moving toward the northeast near 29 mph
(46 km/h), and this motion is expected to continue with an increase
in forward speed during the next 24 hours.  On the forecast track,
the post-tropical cyclone will approach Ireland and the United
Kingdom on Monday.

Maximum sustained winds are near 50 mph (85 km/h) with higher gusts.
Some slight strengthening is possible today.  Some weakening is
expected by Monday, and the system is forecast to be absorbed
by another low pressure area by early Tuesday.

Tropical-storm-force winds extend outward up to 230 miles (370 km)
from the center.

The estimated minimum central pressure is 989 mb (29.21 inches).


HAZARDS AFFECTING LAND
----------------------
Information on rainfall and wind forecasts for Ireland can be
found in products issued by Met Eireann at www.met.ie and for the
United Kingdom in products issued by the United Kingdom Met Office
at www.metoffice.gov/uk.

SURF:  Swells generated by Helene are affecting portions of the
Azores.  These swells are likely to continue for another day or so
and could cause life-threatening surf and rip current conditions.
Please consult products from your local weather office.


NEXT ADVISORY
-------------
This is the last public advisory issued by the National Hurricane
Center on this system.  Additional information on this system can be
found in High Seas Forecasts issued by Meteo France under WMO header
FQNT50 LFPW and available on the web at:
http://www.meteofrance.com/previsions-meteo-marine/bulletin.
Additional information can also be found in High Seas Forecast
issued by the UK Met Office under WMO header FQNT21 EGRR and on the
web at:
http://www.metoffice.gov.uk/public/weather/marine-high-seas/.

$$
Forecaster Brown



 

More information

Expires:No;;733737
WTNT43 KNHC 161443
TCDAT3

Post-Tropical Cyclone Helene Discussion Number  37
NWS National Hurricane Center Miami FL       AL082018
1100 AM AST Sun Sep 16 2018

Helene's cloud pattern has transformed into that of an
extratropical cyclone, with a large area of cold cloud tops
located well to the north and northwest of the center.  An ASCAT
pass that caught the eastern portion of the circulation revealed
maximum winds of 40 to 45 kt, therefore the initial wind speed
remains 45 kt for this advisory.  The global models suggest that
the system will strengthen slightly today due to baroclinic
processes, and this is reflected in the official forecast.
Weakening is anticipated by late Monday, and the system is forecast
to be absorbed by a larger low pressure to the northwest of the
United Kingdom by Tuesday morning.

The cyclone is moving quickly northeastward or 055/25 kt.  Now that
the system is embedded within the mid-latitude westerlies, a
northeastward motion with some additional increase in forward speed
is expected over the next day or so.  The global models remain in
good agreement on the track of the post-tropical low, and the new
official forecast is an update of the previous advisory.

This is the last NHC advisory on this system.  Interests in Ireland
and the United Kingdom should consult products from their local
meteorological service for information about potential impacts from
the post-tropical cyclone.  Local forecasts and warnings for the UK
can be found on the website of the UK Met Office at
https://www.metoffice.gov.uk/. Local forecasts and warnings for
Ireland can be found on the website of Met Eireann
at https://www.met.ie/.

FORECAST POSITIONS AND MAX WINDS

INIT  16/1500Z 43.8N  25.7W   45 KT  50 MPH...POST-TROPICAL
 12H  17/0000Z 45.8N  21.2W   50 KT  60 MPH...POST-TROP/EXTRATROP
 24H  17/1200Z 49.0N  14.8W   50 KT  60 MPH...POST-TROP/EXTRATROP
 36H  18/0000Z 52.8N   6.2W   40 KT  45 MPH...POST-TROP/EXTRATROP
 48H  18/1200Z...ABSORBED

$$
Forecaster Brown



 
	

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