Latest Tropical Advisories from
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SAM Advisory
Expires:No;;671886
WTNT33 KNHC 050834
TCPAT3
BULLETIN
Post-Tropical Cyclone Sam Advisory Number 51
NWS National Hurricane Center Miami FL AL182021
900 AM GMT Tue Oct 05 2021
...SAM TRANSITIONS TO A POWERFUL POST-TROPICAL CYCLONE OVER THE FAR
NORTH ATLANTIC BETWEEN NEWFOUNDLAND AND ICELAND...
...THIS IS THE LAST ADVISORY...
SUMMARY OF 900 AM GMT...0900 UTC...INFORMATION
----------------------------------------------
LOCATION...51.0N 39.4W
ABOUT 690 MI...1110 KM ENE OF CAPE RACE NEWFOUNDLAND
ABOUT 1110 MI...1785 KM SW OF REYKJAVIK ICELAND
MAXIMUM SUSTAINED WINDS...80 MPH...130 KM/H
PRESENT MOVEMENT...N OR 10 DEGREES AT 23 MPH...37 KM/H
MINIMUM CENTRAL PRESSURE...970 MB...28.64 INCHES
WATCHES AND WARNINGS
--------------------
There are no coastal watches or warnings in effect.
DISCUSSION AND OUTLOOK
----------------------
At 900 AM GMT (0900 UTC), the center of Post-Tropical Cyclone Sam
was located near latitude 51.0 North, longitude 39.4 West. The
post-tropical cyclone is moving toward the north near 23 mph (37
km/h), and this general motion should continue today with a further
decrease in forward speed. A slow east-northeastward motion is
forecast to begin by late today, and a northeastward motion is
expected Wednesday and Wednesday night.
Maximum sustained winds have decreased to near 80 mph (130 km/h)
with higher gusts. Although gradual weakening is forecast during
the next few days, Sam is expected to remain a powerful
post-tropical cyclone over the north Atlantic today.
Hurricane-force winds extend outward up to 80 miles (130 km) from
the center and gale-force winds extend outward up to 460 miles (740
km).
The estimated minimum central pressure is 970 mb (28.64 inches).
HAZARDS AFFECTING LAND
----------------------
Key messages for Sam can be found in the Tropical Cyclone Discussion
under AWIPS header MIATCDAT3 and WMO header WTNT43 KNHC, and on the
web at hurricanes.gov/graphics_at3.shtml?key_messages.
SURF: Swells generated by Sam will impact the northern Leeward
Islands, the Greater Antilles, portions of the Bahamas, and
southeastern Newfoundland through midweek. These swells 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 Sam. Additional information on this system can be found
in High Seas Forecasts issued by the National Weather Service,
under AWIPS header NFDHSFAT1, WMO header FZNT01 KWBC, and online at
ocean.weather.gov/shtml/NFDHSFAT1.php.
$$
Forecaster Stewart
Expires:No;;671796
WTNT23 KNHC 050832
TCMAT3
POST-TROPICAL CYCLONE SAM FORECAST/ADVISORY NUMBER 51
NWS NATIONAL HURRICANE CENTER MIAMI FL AL182021
0900 UTC TUE OCT 05 2021
THERE ARE NO COASTAL WATCHES OR WARNINGS IN EFFECT.
POST-TROPICAL CYCLONE CENTER LOCATED NEAR 51.0N 39.4W AT 05/0900Z
POSITION ACCURATE WITHIN 25 NM
PRESENT MOVEMENT TOWARD THE NORTH OR 10 DEGREES AT 20 KT
ESTIMATED MINIMUM CENTRAL PRESSURE 970 MB
MAX SUSTAINED WINDS 70 KT WITH GUSTS TO 85 KT.
64 KT....... 0NE 70SE 70SW 0NW.
50 KT.......120NE 150SE 150SW 60NW.
34 KT.......240NE 270SE 400SW 300NW.
12 FT SEAS..240NE 420SE 780SW 390NW.
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 51.0N 39.4W AT 05/0900Z
AT 05/0600Z CENTER WAS LOCATED NEAR 50.0N 39.5W
FORECAST VALID 05/1800Z 52.1N 38.9W...POST-TROP/EXTRATROP
MAX WIND 65 KT...GUSTS 80 KT.
64 KT... 60NE 60SE 50SW 0NW.
50 KT...100NE 110SE 110SW 100NW.
34 KT...300NE 340SE 480SW 330NW.
FORECAST VALID 06/0600Z 52.8N 35.1W...POST-TROP/EXTRATROP
MAX WIND 60 KT...GUSTS 75 KT.
50 KT...110NE 150SE 150SW 70NW.
34 KT...300NE 450SE 480SW 300NW.
FORECAST VALID 06/1800Z 54.3N 30.0W...POST-TROP/EXTRATROP
MAX WIND 55 KT...GUSTS 65 KT.
50 KT... 0NE 100SE 100SW 0NW.
34 KT...240NE 300SE 270SW 180NW.
FORECAST VALID 07/0600Z 57.9N 24.6W...POST-TROP/EXTRATROP
MAX WIND 50 KT...GUSTS 60 KT.
50 KT... 0NE 0SE 90SW 50NW.
34 KT...200NE 230SE 190SW 150NW.
FORECAST VALID 07/1800Z 61.8N 23.9W...POST-TROP/EXTRATROP
MAX WIND 45 KT...GUSTS 55 KT.
34 KT...400NE 280SE 270SW 420NW.
FORECAST VALID 08/0600Z 62.7N 27.4W...POST-TROP/EXTRATROP
MAX WIND 45 KT...GUSTS 55 KT.
34 KT...330NE 280SE 390SW 420NW.
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 09/0600Z 61.7N 26.2W...POST-TROP/EXTRATROP
MAX WIND 40 KT...GUSTS 50 KT.
OUTLOOK VALID 10/0600Z 63.6N 15.0W...POST-TROP/EXTRATROP
MAX WIND 40 KT...GUSTS 50 KT.
REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 51.0N 39.4W
THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE
CENTER ON SAM. ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE FOUND
IN HIGH SEAS FORECASTS ISSUED BY THE NATIONAL WEATHER SERVICE...
UNDER AWIPS HEADER NFDHSFAT1 AND WMO HEADER FZNT01 KWBC.
$$
FORECASTER STEWART
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