Monthly Archives: November 2021

Tropical Storm Nyatoh Strengthens West of the Marianas

Tropical Storm Nyatoh strengthened over the Western North Pacific Ocean west of the Marianas on Tuesday. At 4:00 p.m. EST on Tuesday the center of Tropical Storm Nyatoh was located at latitude 13.4°N and longitude 136.7°E which put it about 510 miles (825 km) west of Guam. Nyatoh was moving toward the west-northwest at 7 m.p.h. (11 km/h). The maximum sustained wind speed was 60 m.p.h. (95 km/h) and there were wind gusts to 75 m.p.h. (120 km/h). The minimum surface pressure was 991 mb.

Tropical Storm Nyatoh continued to strengthen west of the Marianas on Tuesday. The inner end of a rainband wrapped around the northern and western sides of the center of Nyatoh. Additional bands of showers and thunderstorms were revolving around the center of Tropical Storm Nyatoh. Storms near the center of circulation generated strong upper level divergence that pumped mass away from the tropical storm. Winds to tropical storm force extended out 130 miles (210 km) from the center of Nyatoh’s circulation.

Tropical Storm Nyatoh will move through an environment mostly favorable for intensification during the next 24 hours. Nyatoh will move over water where the Sea Surface Temperatures are near 29˚C. It will move under the western part of the axis of an upper level ridge centered east of the Marianas. The upper level winds are weak near the axis of the ridge and there will be little vertical wind shear. Clockwise flow around a high pressure system centered over eastern Asia could transport drier air toward the northwestern part of Nyatoh’s circulation. The drier air is likely to remain northwest of Tropical Storm Nyatoh during the next 24 hours. Nyatoh could intensify more rapidly once the inner end of the rainband wraps around the center of circulation and a core with an eye and an eyewall develops. Tropical Storm Nyatoh will continue to strengthen and it will intensify to a typhoon during the next 24 hours.

Tropical Storm Nyatoh will move around the western part of a high pressure system over the Western North Pacific Ocean during the next 24 hours. The high pressure system will steer Nyatoh toward the north during the next 24 hours. Nyatoh could move toward the northeast after it moves around the western end of the high pressure system. On its anticipated track Tropical Storm Nyatoh will remain west of the Marianas during the next 24 hours.

TD 27W Strengthens to Tropical Storm Nyatoh West of Guam

Former Tropical Depression 27W strengthened to Tropical Storm Nyatoh west of Guam on Monday night. At 10:00 p.m. EST on Monday the center of Tropical Storm Nyatoh was located at latitude 13.0°N and longitude 138.7°E which put it about 370 miles (600 km) west of Guam. Nyatoh was moving toward the west at 14 m.p.h. (22 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1000 mb.

The circulation around former Tropical Depression 27W continued to strengthen on Monday night and the Japan Meteorological Agency upgraded the system to Tropical Storm Nyatoh. More thunderstorms developed near the center of circulation and in the bands revolving around the center of Nyatoh. Storms near the center generated upper level divergence that pumped mass away from the tropical storm. Winds to tropical storm force extended out 125 miles (200 km) from the center of Tropical Storm Nyatoh.

Tropical Storm Nyatoh will move through an environment mostly favorable for intensification during the next 36 hours. Nyatoh will move over water where the Sea Surface Temperatures are near 29˚C. It will move under the western part of the axis of an upper level ridge centered east of the Marianas. The upper level winds are weak near the axis of the ridge and there will be little vertical wind shear. Clockwise flow around a high pressure system centered over eastern Asia could transport drier air toward the northwestern part of Nyatoh’s circulation. The drier air is likely to remain northwest of the core of Tropical Storm Nyatoh during the next 36 hours. Tropical Storm Nyatoh will continue to strengthen and it could intensify to a typhoon during the next 36 hours.

Tropical Storm Nyatoh will move around the southwestern part of a high pressure system over the Western North Pacific Ocean during the next 36 hours. The high pressure system will steer the tropical depression toward the northwest during the next 36 hours. On its anticipated track Tropical Storm Nyatoh will move farther away from the Marianas and Yap.

Tropical Depression Forms Southwest of the Marianas

A tropical depression formed southwest of the Marianas on Monday morning. At 7:00 a.m. EST on Monday the center of Tropical Depression 27W was located at latitude 11.8°N and longitude 141.1°E which put it about 270 miles (435 km) west-southwest of Guam. The tropical depression was moving toward the west-northwest at 12 m.p.h. (19 km/h). The maximum sustained wind speed was 35 m.p.h. (55 km/h) and there were wind gusts to 45 m.p.h. (75 km/h). The minimum surface pressure was 1003 mb.

The circulation around a low pressure system west-southwest of Guam exhibited more organization on Monday morning and the Japan Meteorological Agency designated the system as a tropical depression. The circulation around Tropical Depression 27W was gradually becoming more organized. A distinct low level center of circulation was evident on conventional and microwave satellite images. More thunderstorms were beginning to develop near the center of circulation. Storms near the center began to generate upper level divergence that pumped mass away from the tropical depression. Additional thunderstorms were forming in bands revolving around the center of the depression.

Tropical Depression 27W will move through an environment favorable for intensification during the next 24 hours. The tropical depression will move over water where the Sea Surface Temperatures are near 29˚C. It will move under the western part of the axis of an upper level ridge centered east of the Marianas. The upper level winds are weak near the axis of the ridge and there will be little vertical wind shear. Tropical Depression 27W will strengthen gradually and it is likely to intensify to a tropical storm during the next 24 hours.

Tropical Depression 27W will move around the southwestern part of a high pressure system over the Western North Pacific Ocean during the next 24 hours. The high pressure system will steer the tropical depression toward the west-northwest during the next day or so. On its anticipated track Tropical Depression 27W will move farther away from the Marianas. It will pass north of Yap.

Tropical Cyclone Paddy Weakens South of Christmas Island

Tropical Cyclone Paddy weakened over the South Indian Ocean south of Christmas Island on Wednesday. At 10:00 a.m. EST on Wednesday the center of Tropical Cyclone Paddy was located at latitude 14.5°S and longitude 105.5°E which put it about 270 miles (440 km) south of Christmas Island. Paddy was moving toward the southwest at 6 m.p.h. (10 km/h). The maximum sustained wind speed was 35 m.p.h. (55 km/h) and there were wind gusts to 45 m.p.h. (75 km/h). The minimum surface pressure was 1003 mb.

An upper level trough over the South Indian Ocean west of Australia was producing strong northwesterly winds that were blowing toward the top of Tropical Cyclone Paddy’s circulation. Those winds were causing strong vertical wind shear and the upper level winds were blowing the tops off of many of the thunderstorms around Paddy’s circulation. The strongest thunderstorms were occurring in bands on the southeastern side of Tropical Cyclone Paddy. Bands in the other parts of the tropical cyclone consisted primarily of showers and lower clouds. The strong vertical wind shear was causing Paddy to weaken.

Tropical Cyclone Paddy will move through an environment unfavorable for a tropical cyclone during the next several days. Paddy will move over water where the Sea Surface Temperatures are near 26˚C. However, the upper level trough west of Australia will continue to cause strong vertical wind shear. The strong wind shear will blow the tops off of any new thunderstorms that develop. The winds around Tropical Cyclone Paddy will decrease gradually during the next 48 hours.

Tropical Cyclone Paddy will move south of a high pressure system over the South Indian Ocean. The high pressure system will steer Paddy toward the west during the next several days as the tropical cyclone weakens gradually. On its anticipated track Tropical Cyclone Paddy will remain well to the south of Christmas Island.

Tropical Cyclone Paddy Develops Southeast of Christmas Island

Tropical Cyclone Paddy developed over the South Indian Ocean southeast of Christmas Island on Monday. At 10:00 a.m. EST on Monday the center of Tropical Cyclone Paddy was located at latitude 13.8°S and longitude 108.0°E which put it about 275 miles (440 km) southeast of Christmas, Island. Paddy was moving toward the southwest at 5 m.p.h. (8 km/h). The maximum sustained wind speed was 45 m.p.h. (75 km/h) and there were wind gusts to 60 m.p.h. (95 km/h). The minimum surface pressure was 997 mb.

A low pressure system over the South Indian Ocean south of Java strengthened on Monday and the Australian Bureau of Meteorology designated the system as Tropical Cyclone Paddy. The strongest thunderstorms in Paddy’s circulation were occurring in bands that were southeast and northwest of the center of circulation. Bands in the northeastern and southwestern parts of the circulation consisted primarily of showers and lower clouds. Storms near the center of circulation generated upper level divergence that pumped mass away from the tropical cyclone. Winds to tropical storm force extended out 75 miles (120 km) from the center of Tropical Cyclone Paddy.

Tropical Cyclone Paddy will move through an environment somewhat favorable for intensification during the next 12 hours. Paddy will move over water where the Sea Surface Temperatures are near 27˚C. It will move through a region where the upper level winds are weak and there will be little vertical wind shear. Tropical Cyclone Paddy could get a little stronger during the next 12 hours. Paddy will move under an area where there are strong northwesterly winds in the upper levels on Tuesday. Those winds will create strong vertical wind shear and the shear will cause Tropical Cyclone Paddy to weaken.

Tropical Cyclone Paddy will move around the northern side of a high pressure system over the South Indian Ocean. The high pressure system will steer Paddy toward the southwest during the next 12 to 24 hours. When Tropical Cyclone Paddy starts to weaken on Tuesday, it will be steered by winds in the lower levels of the atmosphere. Those winds will steer Paddy toward the west during the middle of this week. On its anticipated track Tropical Cyclone Paddy will remain well to the south of Christmas Island.

Tropical Cyclone 04B Brings Rain to Southern India

Tropical Cyclone 04B brought rain to parts of southern India on Thursday. At 4:00 a.m. EST on Thursday the center of Tropical Cyclone 04B was located at latitude 13.1°N and longitude 80.6°W which put it about 30 miles (50 km) east of Chennai, India. The tropical cyclone was moving toward the west-northwest at 9 m.p.h. (14 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1003 mb.

A low pressure system over the western Bay of Bengal strengthened on Thursday morning and the Joint Typhoon Warning Center designated the system as Tropical Cyclone 04B. The India Meteorological Department classified the system as a depression. The center of Tropical Cyclone 04B was located near Chennai, India. The strongest thunderstorms were occurring in bands west of the center of circulation and along the northern periphery of the tropical cyclone. Bands in other parts of the circulation consisted primarily of showers and lower clouds. Winds to tropical storm force extended out 40 miles (65 km/h) from the center of the tropical cyclone.

The center of Tropical Cyclone 04B will make landfall on the southern coast of India near Chennai in a few hours. The tropical cyclone will bring gusty winds to the northern coast of Tamil Nadu and the southern coast of Andhra Pradesh. Tropical Cyclone 04B will drop locally heavy rain over parts or northern Tamil Nadu, southern Andhra Pradesh and southern Karnataka as it moves inland. The tropical cyclone will weaken gradually after it moves inland over southern India.

Tropical Depression Terry Churns West

Tropical Depression Terry churned westward over the Eastern North Pacific Ocean on Wednesday. At 10:00 a.m. EST on Wednesday the center of Tropical Depression Terry was located at latitude 11.7°N and longitude 116.9°W which put it about 900 miles (1450 km) south-southwest of the southern tip of Baja California. Terry was moving toward the west at 15 m.p.h. (24 km/h). The maximum sustained wind speed was 30 m.p.h. (50 km/h) and there were wind gusts to 40 m.p.h. (65 km/h). The minimum surface pressure was 1008 mb.

The distribution of thunderstorms around Tropical Depression Terry was asymmetrical. The strongest thunderstorms were occurring in bands in the southern half of Terry’s circulation. Bands in the northern half of the tropical depression consisted of showers and lower clouds. Sinking drier air was being pulled into the northern side of Tropical Depression Terry. The drier air was inhibiting the formation of thunderstorms in that part of the circulation. Storms near the center of circulation generated upper level divergence that pumped mass away from the tropical depression.

Tropical Depression Terry will move through an environment marginally favorable for intensification during the next 24 hours. Terry will move over water where the Sea Surface Temperatures are near 27˚C. It will move under the axis of an upper level ridge. The upper level winds are weak near the axis of the ridge and there will be little vertical wind shear. Drier air near the northern side of Terry’s circulation could continue to inhibit the develop of thunderstorms in that part of the tropical depression. Tropical Depression Terry is likely to maintain its intensity during the next 24 hours. Terry could strengthen if more thunderstorms develop near the center of circulation.

Tropical Depression Terry will move south of a surface high pressure system over the Eastern North Pacific Ocean during the next few days. The high pressure system will steer Terry toward the west. On its anticipated track Tropical Depression Terry will continue to move farther away from Mexico.

Tropical Storms Sandra and Terry Develop over East Pacific

Tropical Storms Sandra and Terry developed over the Eastern North Pacific Ocean on Sunday afternoon. At 4:00 p.m. EST on Sunday the center of Tropical Storm Sandra was located at latitude 14.0°N and longitude 115.2°W which put it about 705 miles (1135 km) south-southwest of the southern tip of Baja California. Sandra was moving toward the west-northwest at 10 m.p.h. (16 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1006 mb.

At 4:00 p.m. EST on Sunday the center of Tropical Storm Terry was located at latitude 8.5°N and longitude 102.6°W which put it about 735 miles (1180 km) south of Manzanillo, Mexico. Terry was moving toward the west at 14 m.p.h. (22 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1007 mb.

Based on data from a scatterometer on a satellite, the National Hurricane Center upgraded former Tropical Depression Nineteen-E to Tropical Storm Sandra on Sunday afternoon. It appeared from later satellite images that Tropical Storm Sandra might already be weakening. A large upper level trough approaching the west coast of the U.S. was producing strong southerly winds that were blowing across the top of Sandra’s circulation. Those winds were causing moderate vertical wind shear. The strong upper level winds blew the tops off thunderstorms near the center of Sandra. The strongest remaining thunderstorms were occurring in bands east of the center. Bands in other parts of Tropical Storm Sandra consisted primarily of showers and lower clouds. The strongest winds were in the eastern half of Sandra. Winds to tropical storm force extended out 90 miles in the eastern half of Sandra. The winds in the western half of the circulation were blowing at less than tropical storm force.

Tropical Storm Sandra will move through an environment mostly unfavorable for intensification during the next several days. Sandra will move over water where the Sea Surface Temperatures are near 27˚C. However, the large upper level trough will continue to produce strong vertical wind shear. The wind shear is likely to prevent Tropical Storm Sandra from strengthening. The strong shear could blow the top off of Sandra’s circulation and Tropical Storm Sandra is more likely to weaken during the next several days. Sandra will move south of a surface high pressure system over the Eastern North Pacific Ocean. The high pressure system will steer Sandra toward the west. On its anticipated track Tropical Storm Sandra will move farther away from Mexico.

More thunderstorms developed near the center of former Tropical Depression Eighteen-E on Sunday afternoon and the National Hurricane Center upgraded the system to Tropical Storm Terry. The circulation around Tropical Storm Terry exhibited more organization on satellite images. More thunderstorms also formed in bands revolving around the center of Terry. Storms near the center generated upper level divergence that pumped mass away from the tropical storm. Winds to tropical storm force extended out 60 miles (95 km) on the eastern side of Terry’s circulation. The winds in the western half of Terry were blowing at less than tropical storm force.

Tropical Storm Terry will move through an environment somewhat favorable for intensification during the next 24 hours. Terry will move over water where the Sea Surface Temperatures are near 28˚C. It will move through a region where the upper level wind are weak and there will be little vertical wind shear. Tropical Storm Terry could slowly intensify during the next 24 hours.

Tropical Storm Terry will move around the southern side of a surface high pressure system over the Eastern North Pacific Ocean. The high will steer Terry toward the west during the next few days. On its anticipated track Tropical Storm Terry will move farther away from Mexico.

Tropical Storm Wanda Speeds Northeast

Tropical Storm Wanda sped toward the northeast over the Atlantic Ocean west of the Azores on Sunday morning. At 4:00 a.m. EST on Sunday the center of Tropical Storm Wanda was located at latitude 38.5°N and longitude 35.5°W which put it about 460 miles (745 km) west of the Azores. Wanda was moving toward the northeast at 17 m.p.h. (28 km/h). The maximum sustained wind speed was 40 m.p.h. (65 km/h) and there were wind gusts to 50 m.p.h. (80 km/h). The minimum surface pressure was 1003 mb.

An upper level trough and a cold front over the central Atlantic Ocean were steering Tropical Storm Wanda quickly to the northeast on Sunday morning. The upper level trough was also producing strong southwesterly winds that were blowing across the top of Wanda’s circulation. Those winds were causing strong vertical wind shear and the shear was causing Tropical Storm Wanda to weaken. The strongest thunderstorms were occurring in a band in the southeastern part of Wanda. Bands in the other parts of the circulation consisted primarily of showers and lower clouds. The strongest winds were occurring with the thunderstorms in the southeastern part of Tropical Storm Wanda. Winds to tropical storm force extended out 70 miles (110 km) in the southeastern quadrant of Wanda. The winds in the other parts of Wanda’s circulation were blowing at less than tropical storm force.

The upper level trough and the cold front will continue to steer Tropical Storm Wanda toward the northeast during the next several days. Tropical Storm Wanda will move through an environment unfavorable for intensification during the next 24 hours. Wanda will move over water where the Sea Surface Temperatures are near 20˚C. The upper level trough will continue to cause strong vertical wind shear. The cold front is moving faster than Tropical Storm Wanda and Wanda is likely to merge with the cold front during the next 24 hours. Strong vertical wind shear and cold water will cause Wanda to make a transition to an extratropical cyclone when it merges with the cold front. On its anticipated track Wanda could approach Ireland as an extratropical cyclone early next week.

Tropical Storm Wanda Turns Back to the South

Tropical Storm Wanda turned back toward the south over the central Atlantic Ocean west of the Azores on Friday morning. At 11:00 a.m. EDT on Friday the center of Tropical Storm Wanda was located at latitude 40.6°N and longitude 37.8°W which put it about 605 miles (970 km) west-northwest of the Azores. Wanda was moving toward the south-southeast at 8 m.p.h. (13 km/h). The maximum sustained wind speed was 50 m.p.h. (80 km/h) and there were wind gusts to 65 m.p.h. (105 km/h). The minimum surface pressure was 994 mb.

Tropical Storm Wanda moved back toward the south on Friday morning as it continued to meander west of the Azores. The circulation around Tropical Storm Wanda remained well organized. The circulation was circular and there was a well defined center. Bands of showers and thunderstorms revolved around the center of Wanda. Storms near the center of circulation generated upper level divergence that pumped mass away to the north of the tropical storm. Winds to tropical storm force extended out 125 miles (200 km) on the western side of Tropical Storm Wanda. Winds to tropical storm force extended out 70 miles on the eastern side of Wanda.

Tropical Storm Wanda will move through an environment that is somewhat favorable for intensification during the next 24 hours. Wanda will move over water where the Sea Surface Temperatures are near 23˚C. Even though the water is colder than in the tropics, colder air in the middle and upper troposphere will allow for enough instability for the formation of thunderstorms. The thunderstorms that form will not rise as high into the atmosphere. Tropical Storm Wanda will move through a region where the upper level winds are weak and there will be little vertical wind shear. Tropical Storm Wanda could extract enough energy from the Atlantic Ocean to be able to strengthen during the next 24 hours.

Tropical Storm Wanda will move south of a high pressure system over the northern Atlantic Ocean during the next 24 hours. The high pressure system will push Wanda back toward the south during the next 24 hours. An upper level trough near the east coast of the U.S. will move eastward during the next several days. The upper level trough will cause the high pressure system to weaken. When the high weakens, the upper level trough will steer Wanda toward the northeast on Saturday. On its anticipated track Tropical Storm Wanda could approach the western Azores on Sunday.