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FLORIDA
STORMS
Tropical Storm Theta
LOCATED
520 MI SE OF THE AZORES
WINDS
50 MPH
PRESSURE
995 MB
MOVING
E AT 10 MPH
From the National Hurricane Center at 300 AM GMT Sat Nov 14 2020
THETA BEGINS WEAKENING OVER THE EASTERN 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 300 AM GMT (0300 UTC), the center of Tropical Storm Theta was located near latitude 31.9 North, longitude 21.6 West. Theta is moving toward the east near 10 mph (17 km/h). An eastward or eastsoutheastward motion with a gradual decrease in forward speed is expected through Sunday, followed by a sharp northward turn Sunday night into early next week. Satellitederived wind data indicate that maximum sustained winds have decreased to near 50 mph (85 km/h) with higher gusts. Weakening is forecast during the next couple of days, and Theta is expected to become a remnant low by late Sunday. Tropicalstormforce winds extend outward up to 140 miles (220 km) from the center. The estimated minimum central pressure is 995 mb (29.39 inches).

At 300 AM GMT (0300 UTC), the center of Tropical Storm Theta was located near latitude 31.9 North, longitude 21.6 West. Theta is moving toward the east near 10 mph (17 km/h). An eastward or eastsoutheastward motion with a gradual decrease in forward speed is expected through Sunday, followed by a sharp northward turn Sunday night into early next week. Satellitederived wind data indicate that maximum sustained winds have decreased to near 50 mph (85 km/h) with higher gusts. Weakening is forecast during the next couple of days, and Theta is expected to become a remnant low by late Sunday. Tropicalstormforce winds extend outward up to 140 miles (220 km) from the center. The estimated minimum central pressure is 995 mb (29.39 inches).

is beginning to show signs of weakening tonight. Infrared cloud top temperatures have warmed during the past several hours within the weakening convective band that curves around the northeastern semicircle of the storm. A partial 22 UTC ASCAT-B overpass indicates that Theta maintains a fairly symmetric low-level wind field, with 35-40 kt winds in the eastern semicircle of the storm. Therefore, the initial intensity is lowered to 45 kt with this advisory, which is consistent with UW-CIMSS objective current intensity estimates but slightly higher than the T2.5 subjective Dvorak classification from TAFB. Theta will encounter increasingly hostile environmental conditions over the next couple of days. The NHC intensity forecast calls for steady weakening through the weekend, as strong northerly wind shear and cool sea surface temperatures will likely inhibit the storm from sustaining convection near its center. This forecast closely follows the corrected consensus aid HCCA. Theta is expected to weaken to a tropical depression within 36 h and degenerate into a remnant low by 48 h, although the GFS simulated satellite imagery suggests this could occur even sooner than forecast. The remnant low should dissipate by the middle of next week.

Theta is still moving eastward at around 9 kt around the northern periphery of a mid-level ridge that extends from western Africa across the eastern tropical Atlantic. An eastward or east-southeastward motion with a gradual decrease in forward speed is expected during the next 24-36 h. As the storm spins down and becomes a more shallow circulation, the remains of Theta will turn northward and then accelerate northeastward ahead of a mid-latitude cyclone and associated frontal system that will cross the northeastern Atlantic. The NHC track forecast lies close to the previous one and near the center of the guidance envelope. On the forecast track, the center of Theta is expected to pass northwest of the Canary Islands this weekend, then move near Madeira Island early Monday as a weak remnant low.

is beginning to show signs of weakening tonight. Infrared cloud top temperatures have warmed during the past several hours within the weakening convective band that curves around the northeastern semicircle of the storm. A partial 22 UTC ASCAT-B overpass indicates that Theta maintains a fairly symmetric low-level wind field, with 35-40 kt winds in the eastern semicircle of the storm. Therefore, the initial intensity is lowered to 45 kt with this advisory, which is consistent with UW-CIMSS objective current intensity estimates but slightly higher than the T2.5 subjective Dvorak classification from TAFB. Theta will encounter increasingly hostile environmental conditions over the next couple of days. The NHC intensity forecast calls for steady weakening through the weekend, as strong northerly wind shear and cool sea surface temperatures will likely inhibit the storm from sustaining convection near its center. This forecast closely follows the corrected consensus aid HCCA. Theta is expected to weaken to a tropical depression within 36 h and degenerate into a remnant low by 48 h, although the GFS simulated satellite imagery suggests this could occur even sooner than forecast. The remnant low should dissipate by the middle of next week.

Theta is still moving eastward at around 9 kt around the northern periphery of a mid-level ridge that extends from western Africa across the eastern tropical Atlantic. An eastward or east-southeastward motion with a gradual decrease in forward speed is expected during the next 24-36 h. As the storm spins down and becomes a more shallow circulation, the remains of Theta will turn northward and then accelerate northeastward ahead of a mid-latitude cyclone and associated frontal system that will cross the northeastern Atlantic. The NHC track forecast lies close to the previous one and near the center of the guidance envelope. On the forecast track, the center of Theta is expected to pass northwest of the Canary Islands this weekend, then move near Madeira Island early Monday as a weak remnant low.

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