Overall Green alert Tropical Cyclone for ALPHA-20
in Portugal, Spain

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Original Message :

WTNT44 KNHC 190236
TCDAT4

Post-Tropical Cyclone Alpha Discussion Number 3
NWS National Hurricane Center Miami FL AL242020
300 AM GMT Sat Sep 19 2020

METEOSAT imagery, IPMA radar data, and surface observations
indicate that Alpha has degenerated to a post-tropical remnant low
just a few miles to the southeast of Viseu, Portugal. Therefore,
this the last NHC advisory. Surface wind data support an initial
intensity of 25 kt. The rapidly deteriorating small remnant low is
expected to move generally toward the northeast at about 14 kt for
the next 6 to 12 hours before dissipating over northern Spain by
Saturday night. The NHC forecast track is basically an update of
the previous advisory and lies between the tightly clustered
deterministic guidance.

Additional information on the hazards from this system can be found
in products from the Portuguese Institute for Sea and Atmosphere at
www.ipma.pt.


FORECAST POSITIONS AND MAX WINDS

INIT 19/0300Z 40.9N 6.9W 25 KT 30 MPH...POST-TROPICAL
12H 19/1200Z 42.6N 4.4W 20 KT 25 MPH...POST-TROP/INLAND
24H 20/0000Z...DISSIPATED

$$
Forecaster Roberts

>

Original Message :

WTNT34 KNHC 190235
TCPAT4

BULLETIN
Post-Tropical Cyclone Alpha Advisory Number 3
NWS National Hurricane Center Miami FL AL242020
300 AM GMT Sat Sep 19 2020

...SHORT-LIVED ALPHA BECOMES A REMNANT LOW OVER THE DISTRICT OF
VISEU PORTUGAL..
...THIS IS THE LAST ADVISORY...


SUMMARY OF 300 AM GMT...0300 UTC...INFORMATION
----------------------------------------------
LOCATION...40.9N 6.9W
ABOUT 1090 MI...1750 KM ENE OF THE AZORES
MAXIMUM SUSTAINED WINDS...30 MPH...45 KM/H
PRESENT MOVEMENT...NE OR 50 DEGREES AT 16 MPH...26 KM/H
MINIMUM CENTRAL PRESSURE...1005 MB...29.68 INCHES


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

Interests in Portugal should monitor the progress of Alpha.
Additional information on this system can be found in products from
the Portuguese Institute for Sea and Atmosphere at www.ipma.pt.


DISCUSSION AND OUTLOOK
----------------------
At 300 AM GMT (0300 UTC), the center of Post-Tropical Cyclone Alpha
was located near latitude 40.9 North, longitude 6.9 West. The
post-tropical cyclone is moving toward the northeast near 16 mph (26
km/h), and this general motion is expected to continue during the
next 12 hours or so. Alpha should move across northern Portugal and
Spain before dissipating later today.

Maximum sustained winds have decreased to near 30 mph (45 km/h)
with higher gusts. The remnant low is expected to dissipate by
Saturday night.

The estimated minimum central pressure is 1005 mb (29.68 inches).


HAZARDS AFFECTING LAND
----------------------
WIND...Information on wind hazards from Alpha can be found in
products from the Portuguese Institute for Sea and Atmosphere at
www.ipma.pt.

RAINFALL...Alpha is expected to produce storm totals of 1 to 2
inches of rainfall, with isolated amounts of 3 inches over the
northern portion of Portugal and into west-central Spain before rain
tapers off later today.


NEXT ADVISORY
-------------
This is the last public advisory issued by the National Hurricane
Center on this system.

$$
Forecaster Roberts

>

Original Message :

WTNT24 KNHC 190235
TCMAT4

POST-TROPICAL CYCLONE ALPHA FORECAST/ADVISORY NUMBER 3
NWS NATIONAL HURRICANE CENTER MIAMI FL AL242020
0300 UTC SAT SEP 19 2020

THERE ARE NO COASTAL TROPICAL CYCLONE WATCHES OR WARNINGS IN EFFECT.

INTERESTS IN PORTUGAL SHOULD MONITOR THE PROGRESS OF ALPHA.
ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE FOUND IN PRODUCTS FROM
THE PORTUGUESE INSTITUTE FOR SEA AND ATMOSPHERE AT WWW.IPMA.PT.

POST-TROPICAL CYCLONE CENTER LOCATED NEAR 40.9N 6.9W AT 19/0300Z
POSITION ACCURATE WITHIN 20 NM

PRESENT MOVEMENT TOWARD THE NORTHEAST OR 50 DEGREES AT 14 KT

ESTIMATED MINIMUM CENTRAL PRESSURE 1005 MB
MAX SUSTAINED WINDS 25 KT WITH GUSTS TO 35 KT.
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 40.9N 6.9W AT 19/0300Z
AT 19/0000Z CENTER WAS LOCATED NEAR 40.5N 7.7W

FORECAST VALID 19/1200Z 42.6N 4.4W...POST-TROP/INLAND
MAX WIND 20 KT...GUSTS 30 KT.

FORECAST VALID 20/0000Z...DISSIPATED

REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 40.9N 6.9W

THIS IS THE LAST FORECAST/ADVISORY ISSUED BY THE NATIONAL HURRICANE
CENTER ON THIS SYSTEM

$$
FORECASTER ROBERTS

>

Original Message :

WTNT44 KNHC 182055
TCDAT4

Subtropical Storm Alpha Discussion Number 2
NWS National Hurricane Center Miami FL AL242020
900 PM GMT Fri Sep 18 2020

Radar data from Portugal indicated that Alpha made landfall at about
1830 UTC with a fairly impressive spiral band signature. It is
estimated that the winds were 45 kt at landfall, and a sustained
10-minute wind of 39 kt was recorded at Sao Pedro de Noel. The
minimum central pressure is analyzed at 996 mb at landfall due to a
999 mb value at Monte Real with a 31-kt sustained wind. Since these
data were recorded, the radar presentation has deteriorated, and
satellite imagery suggests the small cyclone could be de-coupling
from its mid-level center. The winds are assumed to have come
down, with a current estimate of 40 kt. The small cyclone should
continue to move northeastward at about 15 kt for the next 12-24
hours before dissipating over northern Spain or the Bay of Biscay.
No significant changes are required to the forecast for track or
intensity.

Additional information on the hazards from this system can be found
in products from the Portuguese Institute for Sea and Atmosphere at
www.ipma.pt.


FORECAST POSITIONS AND MAX WINDS

INIT 18/2100Z 40.4N 8.4W 40 KT 45 MPH...INLAND
12H 19/0600Z 42.1N 6.1W 25 KT 30 MPH...POST-TROP/INLAND
24H 19/1800Z...DISSIPATED

$$
Forecaster Blake

>

Original Message :

WTNT34 KNHC 182051
TCPAT4

BULLETIN
Subtropical Storm Alpha Advisory Number 2
NWS National Hurricane Center Miami FL AL242020
900 PM GMT Fri Sep 18 2020

...ALPHA MAKES LANDFALL IN PORTUGAL...
...EXPECTED TO DISSIPATE ON SATURDAY...


SUMMARY OF 900 PM GMT...2100 UTC...INFORMATION
----------------------------------------------
LOCATION...40.4N 8.4W
ABOUT 120 MI...195 KM NNE OF LISBON PORTUGAL
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...NE OR 40 DEGREES AT 17 MPH...28 KM/H
MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES


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

Interests in Portugal should monitor the progress of Alpha.
Additional information on this system can be found in products from
the Portuguese Institute for Sea and Atmosphere at
www.ipma.pt.


DISCUSSION AND OUTLOOK
----------------------
At 900 PM GMT (2100 UTC), the center of Subtropical Storm Alpha was
located near latitude 40.4 North, longitude 8.4 West. The storm is
moving toward the northeast near 17 mph (28 km/h), and this general
motion is expected during the next day or so. Alpha should move
across northern Portugal and Spain before dissipating on Saturday.

Maximum sustained winds are near 45 mph (75 km/h) with higher gusts.
The storm should weaken into a depression overnight and a
remnant low pressure area on Saturday.

Winds of 40 mph extend outward up to 35 miles (55 km) from the
center.

The estimated minimum central pressure is 998 mb (29.47 inches).


HAZARDS AFFECTING LAND
----------------------
WIND...Information on wind hazards from Alpha can be found in
products from the Portuguese Institute for Sea and Atmosphere at
www.ipma.pt.

RAINFALL...Alpha is expected to produce 1 to 2 inches (25 to 50 mm)
of rainfall, with isolated amounts of 3 inches (75 mm) over the
northern portion of Portugal and into west-central Spain through
Saturday morning.

NEXT ADVISORY
-------------
Next complete advisory at 300 AM GMT.

$$
Forecaster Blake

>

Original Message :

WTNT24 KNHC 182049
TCMAT4

SUBTROPICAL STORM ALPHA FORECAST/ADVISORY NUMBER 2
NWS NATIONAL HURRICANE CENTER MIAMI FL AL242020
2100 UTC FRI SEP 18 2020

THERE ARE NO COASTAL TROPICAL CYCLONE WATCHES OR WARNINGS IN EFFECT.

INTERESTS IN PORTUGAL SHOULD MONITOR THE PROGRESS OF ALPHA.
ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE FOUND IN PRODUCTS FROM
THE PORTUGUESE INSTITUTE FOR SEA AND ATMOSPHERE AT
WWW.IPMA.PT.

SUBTROPICAL STORM CENTER LOCATED NEAR 40.4N 8.4W AT 18/2100Z
POSITION ACCURATE WITHIN 20 NM

PRESENT MOVEMENT TOWARD THE NORTHEAST OR 40 DEGREES AT 15 KT

ESTIMATED MINIMUM CENTRAL PRESSURE 998 MB
MAX SUSTAINED WINDS 40 KT WITH GUSTS TO 50 KT.
34 KT....... 30NE 30SE 30SW 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 40.4N 8.4W AT 18/2100Z
AT 18/1800Z CENTER WAS LOCATED NEAR 39.9N 9.0W

FORECAST VALID 19/0600Z 42.1N 6.1W...POST-TROP/INLAND
MAX WIND 25 KT...GUSTS 35 KT.

FORECAST VALID 19/1800Z...DISSIPATED

REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 40.4N 8.4W

NEXT ADVISORY AT 19/0300Z

$$
FORECASTER BLAKE

>

Original Message :

WTNT44 KNHC 181634
TCDAT4

Subtropical Storm Alpha Special Discussion Number 1
NWS National Hurricane Center Miami FL AL242020
430 PM GMT Fri Sep 18 2020

The small low pressure area that has been rotating around a larger
extratropical low in the far northeastern Atlantic has become better
organized this morning. Moderate-to-deep convection has persisted
near the center since last night, scatterometer data shows a closed
40-kt low, and radar images from Portugal show a definite organized
convective pattern. While the system is still in the cyclonic
envelope of the large extratropical low and likely neutral- or
cold-core, it has developed enough tropical characteristics to be
considered a subtropical storm. The initial intensity is set to 45
kt in accordance with the scatterometer data, assuming some
undersampling for this small system.

Little change in strength is forecast until landfall in Portugal
during the next couple of hours. Global models show the small low
moving northeastward at about 15 kt for the next 24 hours before
dissipating over northern Spain or the Bay of Biscay. The track and
intensity forecasts are consistent with the consensus guidance.

Additional information on the hazards from this system can be found
in products from the Portuguese Institute for Sea and Atmosphere at
www.ipma.pt.

FORECAST POSITIONS AND MAX WINDS

INIT 18/1630Z 39.9N 9.3W 45 KT 50 MPH
12H 19/0000Z 41.5N 7.5W 30 KT 35 MPH...POST-TROP/INLAND
24H 19/1200Z 44.2N 4.2W 30 KT 35 MPH...POST-TROP/EXTRATROP
36H 20/0000Z...DISSIPATED

$$
Forecaster Blake

>

Original Message :

WTNT34 KNHC 181633
TCPAT4

BULLETIN
Subtropical Storm Alpha Special Advisory Number 1
NWS National Hurricane Center Miami FL AL242020
430 PM GMT Fri Sep 18 2020

...SUBTROPICAL STORM ALPHA FORMS NEAR THE COAST OF PORTUGAL...
...EXPECTED TO BE SHORT-LIVED BUT BRING WINDS AND RAIN TO
PORTIONS OF PORTUGAL...


SUMMARY OF 430 PM GMT...1630 UTC...INFORMATION
----------------------------------------------
LOCATION...39.9N 9.3W
ABOUT 75 MI...125 KM N OF LISBON PORTUGAL
MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H
PRESENT MOVEMENT...NE OR 35 DEGREES AT 17 MPH...28 KM/H
MINIMUM CENTRAL PRESSURE...999 MB...29.50 INCHES


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

Interests in Portugal should monitor the progress of Alpha.
Additional information on this system can be found in products from
the Portuguese Institute for Sea and Atmosphere at
www.ipma.pt.


DISCUSSION AND OUTLOOK
----------------------
At 430 PM GMT (1630 UTC), the center of Subtropical Storm Alpha was
located near latitude 39.9 North, longitude 9.3 West. The storm is
moving toward the northeast near 17 mph (28 km/h), and this general
motion is expected during the next day or so before dissipation.
Alpha should move across the coast of west-central Portugal during
the next couple of days.

Maximum sustained winds are near 50 mph (85 km/h) with higher gusts.
Little change in strength is expected before landfall, with rapid
weakening over land through the weekend.

Alpha is a small storm. Winds of 40 mph extend outward up to 35
miles (55 km) from the center.

The estimated minimum central pressure is 999 mb (29.50 inches).


HAZARDS AFFECTING LAND
----------------------
WIND...Information on wind hazards from Alpha can be found in
products from the Portuguese Institute for Sea and Atmosphere at
www.ipma.pt.

RAINFALL...Alpha is expected to produce 1 to 2 inches (25 to 50 mm)
of rainfall, with isolated amounts of 3 inches (75 mm) over the
northern portion of Portugal and into west-central Spain through
Saturday morning.


NEXT ADVISORY
-------------
Next complete advisory at 900 PM GMT.

$$
Forecaster Blake

>

Original Message :

WTNT24 KNHC 181632
TCMAT4

SUBTROPICAL STORM ALPHA SPECIAL FORECAST/ADVISORY NUMBER 1
NWS NATIONAL HURRICANE CENTER MIAMI FL AL242020
1630 UTC FRI SEP 18 2020

THERE ARE NO COASTAL TROPICAL CYCLONE WATCHES OR WARNINGS IN EFFECT.

INTERESTS IN PORTUGAL SHOULD MONITOR THE PROGRESS OF ALPHA.
ADDITIONAL INFORMATION ON THIS SYSTEM CAN BE FOUND IN PRODUCTS FROM
THE PORTUGUESE INSTITUTE FOR SEA AND ATMOSPHERE AT WWW.IPMA.PT.

SUBTROPICAL STORM CENTER LOCATED NEAR 39.9N 9.3W AT 18/1630Z
POSITION ACCURATE WITHIN 20 NM

PRESENT MOVEMENT TOWARD THE NORTHEAST OR 35 DEGREES AT 15 KT

ESTIMATED MINIMUM CENTRAL PRESSURE 999 MB
MAX SUSTAINED WINDS 45 KT WITH GUSTS TO 55 KT.
34 KT....... 30NE 30SE 30SW 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 39.9N 9.3W AT 18/1630Z
AT 18/1200Z CENTER WAS LOCATED NEAR 38.9N 10.3W

FORECAST VALID 19/0000Z 41.5N 7.5W...POST-TROP/INLAND
MAX WIND 30 KT...GUSTS 40 KT.

FORECAST VALID 19/1200Z 44.2N 4.2W...POST-TROP/EXTRATROP
MAX WIND 30 KT...GUSTS 40 KT.

FORECAST VALID 20/0000Z...DISSIPATED

REQUEST FOR 3 HOURLY SHIP REPORTS WITHIN 300 MILES OF 39.9N 9.3W

NEXT ADVISORY AT 18/2100Z

$$
FORECASTER BLAKE

>