From Weather Alert@21:1/175 to All on Friday, September 18, 2020 15:56:00
915
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.