Made landfall in Portugal at about 2:30pm EDT Friday
Posted by
Chris in Tampa on 9/18/2020, 5:05 pm
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
$$
Forecaster Blake
Subtropical Storm Alpha Advisory Number 2
NWS National Hurricane Center Miami FL AL242020
900 PM GMT Fri Sep 18 2020
...ALPHA MAKES LANDFALL IN PORTUGAL...
...EXPECTED TO DISSIPATE ON SATURDAY...
SUMMARY OF 900 PM GMT...2100 UTC...INFORMATION
----------------------------------------------
LOCATION...40.4N 8.4W
ABOUT 120 MI...195 KM NNE OF LISBON PORTUGAL
MAXIMUM SUSTAINED WINDS...45 MPH...75 KM/H
PRESENT MOVEMENT...NE OR 40 DEGREES AT 17 MPH...28 KM/H
MINIMUM CENTRAL PRESSURE...998 MB...29.47 INCHES
WATCHES AND WARNINGS
--------------------
There are no coastal tropical cyclone watches or warnings in effect.
Interests in Portugal should monitor the progress of Alpha.
Additional information on this system can be found in products from
the Portuguese Institute for Sea and Atmosphere at
www.ipma.pt.
DISCUSSION AND OUTLOOK
----------------------
At 900 PM GMT (2100 UTC), the center of Subtropical Storm Alpha was
located near latitude 40.4 North, longitude 8.4 West. The storm is
moving toward the northeast near 17 mph (28 km/h), and this general
motion is expected during the next day or so. Alpha should move
across northern Portugal and Spain before dissipating on Saturday.
Maximum sustained winds are near 45 mph (75 km/h) with higher gusts.
The storm should weaken into a depression overnight and a
remnant low pressure area on Saturday.
Winds of 40 mph extend outward up to 35 miles (55 km) from the
center.
The estimated minimum central pressure is 998 mb (29.47 inches).
HAZARDS AFFECTING LAND
----------------------
WIND...Information on wind hazards from Alpha can be found in
products from the Portuguese Institute for Sea and Atmosphere at
www.ipma.pt.
RAINFALL...Alpha is expected to produce 1 to 2 inches (25 to 50 mm)
of rainfall, with isolated amounts of 3 inches (75 mm) over the
northern portion of Portugal and into west-central Spain through
Saturday morning.
NEXT ADVISORY
-------------
Next complete advisory at 300 AM GMT.
$$
Forecaster Blake |
24
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