FLORIDA
STORMS
Subtropical Storm Alpha
LOCATED
120 MI NNE OF LISBON PORTUGAL
WINDS
45 MPH
PRESSURE
998 MB
MOVING
NE AT 17 MPH
From the National Hurricane Center at 900 PM GMT Fri Sep 18 2020
ALPHA MAKES LANDFALL IN PORTUGAL
TAP LINKS BELOW TO FOCUS
Alerts
hazards
summary
DISCUSSION

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.

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.

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 westcentral Spain through Saturday morning.

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 westcentral Spain through Saturday morning.

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).

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).

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.

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.

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