FLORIDA
STORMS
Tropical Depression Seventeen
LOCATED
330 MI SW OF THE SOUTHERNMOST CABO VERDE ISLANDS
WINDS
35 MPH
PRESSURE
1007 MB
MOVING
NNW AT 14 MPH
From the National Hurricane Center at 800 AM CVT Sun Sep 19 2021
New tropical depression forms over the far eastern tropical Atlantic.
TAP LINKS BELOW TO FOCUS
Alerts
hazards
summary
DISCUSSION

There are no coastal watches or warnings in effect.

There are no coastal watches or warnings in effect.

None.

None.

At 800 AM CVT (0900 UTC), the center of newly formed Tropical Depression Seventeen was located near latitude 11.8 North, longitude 28.2 West. The depression is moving toward the north northwest near 14 mph (22 km/h), and this general motion is expected to continue today. A motion toward northwest is forecast to begin by tonight and continue through Tuesday. Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. Some strengthening is expected for the next couple of days, and the depression could become a tropical storm later today or on Monday. By Tuesday, environmental conditions are is expected to become less conducive for development, and the system is forecast to begin a slow weakening trend. The estimated minimum central pressure is 1007 mb (29.74 inches).

At 800 AM CVT (0900 UTC), the center of newly formed Tropical Depression Seventeen was located near latitude 11.8 North, longitude 28.2 West. The depression is moving toward the north northwest near 14 mph (22 km/h), and this general motion is expected to continue today. A motion toward northwest is forecast to begin by tonight and continue through Tuesday. Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. Some strengthening is expected for the next couple of days, and the depression could become a tropical storm later today or on Monday. By Tuesday, environmental conditions are is expected to become less conducive for development, and the system is forecast to begin a slow weakening trend. The estimated minimum central pressure is 1007 mb (29.74 inches).

The small low pressure system that the NHC has been tracking the past few days has acquired a well-defined circulation and enough organized deep convection to be classified as a tropical depression. The initial intensity of 30 kt is based on 0000 UTC ASCAT wind data of about 30 kt. This intensity is also supported by consensus Dvorak satellite classifications of T2.0/30 kt from TAFB and SAB.

The initial motion estimate is north-northwestward or 330/12 kt. The small cyclone is forecast to move in a general northwestward direction throughout the remainder of the forecast period as the system moves along the southwestern and western periphery of a subtropical ridge that extends westward from Africa across the Cabo Verde Islands. The NHC forecast track lies down the middle of the tightly packed track models.

Only modest strengthening is expected during the next 48 hour so while the small cyclone remains over 27-28 deg C sea-surface temperatures and the vertical wind shear decreases to near 5 kt during that time. However, proximity to dry air is expected prevent any significant strengthening from occurring. By late Tuesday, a slow weakening trend is forecast to begin as the system moves over cooler water and the shear increases from the southwest. The NHC intensity forecast closely follows a blend of the IVCN and HCCA intensity consensus models through 72 hours, and then is lower than the HCCA model on days 4 and 5.

The small low pressure system that the NHC has been tracking the past few days has acquired a well-defined circulation and enough organized deep convection to be classified as a tropical depression. The initial intensity of 30 kt is based on 0000 UTC ASCAT wind data of about 30 kt. This intensity is also supported by consensus Dvorak satellite classifications of T2.0/30 kt from TAFB and SAB.

The initial motion estimate is north-northwestward or 330/12 kt. The small cyclone is forecast to move in a general northwestward direction throughout the remainder of the forecast period as the system moves along the southwestern and western periphery of a subtropical ridge that extends westward from Africa across the Cabo Verde Islands. The NHC forecast track lies down the middle of the tightly packed track models.

Only modest strengthening is expected during the next 48 hour so while the small cyclone remains over 27-28 deg C sea-surface temperatures and the vertical wind shear decreases to near 5 kt during that time. However, proximity to dry air is expected prevent any significant strengthening from occurring. By late Tuesday, a slow weakening trend is forecast to begin as the system moves over cooler water and the shear increases from the southwest. The NHC intensity forecast closely follows a blend of the IVCN and HCCA intensity consensus models through 72 hours, and then is lower than the HCCA model on days 4 and 5.

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