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Atlantic Tropical Weather Outlook
2021-09-11 13:35:01| National Hurricane Center (Atlantic)
000 ABNT20 KNHC 111134 TWOAT Tropical Weather Outlook NWS National Hurricane Center Miami FL 800 AM EDT Sat Sep 11 2021 For the North Atlantic...Caribbean Sea and the Gulf of Mexico: The National Hurricane Center is issuing advisories on Hurricane Larry, located over the Labrador Sea. A tropical wave and an upper-level trough are producing a large area of disorganized showers and thunderstorms over portions of Central America, southeastern Mexico, and the adjacent waters of the northwestern Caribbean Sea and southern Gulf of Mexico. Although upper-level winds are not conducive for development currently, they are expected to become more favorable for the system during the next day or so. A tropical depression is likely to form on Sunday or Monday while the disturbance moves northwestward and then northward near the coast of northeastern Mexico. Further development will be possible through the middle of next week if it remains over water, and interests along the western and northwestern Gulf coast should monitor the progress of this system. Regardless of development, this disturbance is expected to produce heavy rain across portions of Central America and the Yucatan Peninsula through today which may lead to flash flooding and mudslides. By late this weekend, heavy rain will likely reach portions of the western Gulf coast, including coastal Texas and Louisiana through the middle of next week. Localized significant rainfall amounts will be possible, potentially resulting in areas of flash and urban flooding. * Formation chance through 48 hours...high...70 percent. * Formation chance through 5 days...high...80 percent. A tropical wave continues to produce a concentrated area of showers and thunderstorms just southeast of the Cabo Verde Islands. Environmental conditions appear generally conducive for gradual development, and a tropical depression is likely to form late this weekend or early next week while the system moves westward over the far eastern Atlantic. Regardless of development, this system is likely to bring gusty winds and locally heavy rain across the Cabo Verde Islands later today and tonight. * Formation chance through 48 hours...medium...50 percent. * Formation chance through 5 days...high...70 percent. Another tropical wave is expected to move off the west coast of Africa in a few days. Some development of this system will be possible through the middle of next week while it moves westward across the eastern tropical Atlantic Ocean. * Formation chance through 48 hours...low...near 0 percent. * Formation chance through 5 days...low...20 percent. $$ Forecaster Cangialosi
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Atlantic Tropical Weather Outlook
2021-09-11 07:54:20| National Hurricane Center (Atlantic)
000 ABNT20 KNHC 110554 TWOAT Tropical Weather Outlook NWS National Hurricane Center Miami FL 200 AM EDT Sat Sep 11 2021 For the North Atlantic...Caribbean Sea and the Gulf of Mexico: The National Hurricane Center is issuing advisories on Hurricane Larry, located over Newfoundland, Canada. Disorganized showers and thunderstorms over portions of Central America, southeastern Mexico, and the adjacent waters of the northwestern Caribbean Sea and southern Gulf of Mexico are associated with a tropical wave interacting with an upper-level trough. Upper-level winds over the western Gulf of Mexico are expected to become more conducive for development over the weekend, and a tropical depression is likely to form on Sunday or Monday while the system moves northwestward and then northward near the coast of northeastern Mexico. Further development of this system will be possible through the middle of next week if it remains over water, and interests along the western and northwestern Gulf coast should monitor the progress of this system. Regardless of development, this disturbance is expected to produce heavy rain across portions of Central America and the Yucatan Peninsula today, which may lead to flash flooding and mudslides. By late this weekend, heavy rain will likely reach portions of the western Gulf coast, including coastal Texas and Louisiana through the middle of next week. Localized significant rainfall amounts will be possible, resulting in limited flash and urban flooding. * Formation chance through 48 hours...high...70 percent. * Formation chance through 5 days...high...80 percent. A tropical wave is producing a concentrated area of showers and thunderstorms between Senegal and the Cabo Verde Islands. Environmental conditions appear generally conducive for additional development, and a tropical depression is likely to form late this weekend or early next week while the system moves generally westward over the far eastern Atlantic near the Cabo Verde Islands. Interests in the Cabo Verde Islands should monitor the progress of this system. * Formation chance through 48 hours...medium...50 percent. * Formation chance through 5 days...high...70 percent. Another tropical wave is expected to move off the west coast of Africa early next week. Some development of this system will be possible through the middle of next week while it moves westward across the eastern tropical Atlantic Ocean. * Formation chance through 48 hours...low...near 0 percent. * Formation chance through 5 days...low...20 percent. $$ Forecaster Berg
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atlantic
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tropical
Eastern North Pacific Tropical Weather Outlook
2021-09-11 07:37:22| National Hurricane Center (East Pacific)
000 ABPZ20 KNHC 110537 TWOEP Tropical Weather Outlook NWS National Hurricane Center Miami FL 1100 PM PDT Fri Sep 10 2021 For the eastern North Pacific...east of 140 degrees west longitude: The National Hurricane Center is issuing advisories on recently downgraded Tropical Depression Olaf, located less than 100 miles west of Cabo San Lazaro, Mexico. A broad area of low pressure developing a couple of hundred miles south of the Gulf of Tehuantepec is producing a large area of disorganized showers and thunderstorms. Environmental conditions are generally conducive for some development of this system if it remains over water, and a tropical depression could form late this weekend or early next week while moving west-northwestward at 5 to 10 mph near the southern and southwestern coasts of Mexico. Regardless of development, this system will likely produce heavy rains across portions of Central America and southern Mexico during the next few days. * Formation chance through 48 hours...medium...50 percent. * Formation chance through 5 days...medium...60 percent. $$ Forecaster Berg
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Tropical Depression Olaf Graphics
2021-09-11 04:49:41| National Hurricane Center (East Pacific)
5-Day Uncertainty Track last updated Sat, 11 Sep 2021 02:49:41 GMT Wind Speed Probabilities last updated Sat, 11 Sep 2021 03:28:38 GMT
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olaf
Tropical Depression Olaf Forecast Discussion Number 14
2021-09-11 04:49:15| National Hurricane Center (East Pacific)
Issued at 900 PM MDT Fri Sep 10 2021 000 WTPZ45 KNHC 110249 TCDEP5 Tropical Depression Olaf Discussion Number 14 NWS National Hurricane Center Miami FL EP152021 900 PM MDT Fri Sep 10 2021 Olaf continues to rapidly weaken this evening as the low-level circulation spins down while devoid of any deep convection. Olaf has now failed to produce deep convection for more than 12 hours, and barring any diurnal convective bursts tonight, could become a remnant low as soon as tomorrow morning. Winds along the coast of Baja California Sur are gradually subsiding, and the most recent TAFB and SAB subjective Dvorak data-T intensity estimates support downgrading Olaf to a tropical depression this advisory, with maximum sustained winds of 30 kt. The tropical depression's track continues to bend leftward as it pulls away from Baja California Sur, with the latest motion estimate now due west at 270/7 kt. Now that Olaf has become a shallow cyclone, it will primarily be steered by the low-level flow around a extensive subtropical ridge located to the northwest. This flow will continue to turn Olaf to the left with a southwestward motion beginning in the next 24 hours, which should continue until the cyclone dissipates. The official NHC track forecast was nudged a little to the south and east, following the multi-model consensus aids. A combination of cooling sea-surface temperatures (below 26 C) and very dry-mid level air (below 40 percent relative humidity) should ensure that Olaf will soon meet a swift end as a tropical cyclone. The official NHC intensity forecast now makes Olaf a remnant low in 12 hours, and spins the circulation down to 20 kt until eventual dissipation over the open east Pacific. FORECAST POSITIONS AND MAX WINDS INIT 11/0300Z 24.7N 113.3W 30 KT 35 MPH 12H 11/1200Z 24.7N 114.2W 25 KT 30 MPH...POST-TROP/REMNT LOW 24H 12/0000Z 24.4N 115.3W 20 KT 25 MPH...POST-TROP/REMNT LOW 36H 12/1200Z 23.6N 116.3W 20 KT 25 MPH...POST-TROP/REMNT LOW 48H 13/0000Z 22.7N 117.6W 20 KT 25 MPH...POST-TROP/REMNT LOW 60H 13/1200Z 21.7N 118.9W 20 KT 25 MPH...POST-TROP/REMNT LOW 72H 14/0000Z 21.0N 120.1W 20 KT 25 MPH...POST-TROP/REMNT LOW 96H 15/0000Z 20.6N 121.3W 20 KT 25 MPH...POST-TROP/REMNT LOW 120H 16/0000Z...DISSIPATED $$ Forecaster Papin
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