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Tropical Depression Twenty-One-E Forecast Discussion Number 1
2020-11-17 22:12:11| National Hurricane Center (East Pacific)
Issued at 200 PM MST Tue Nov 17 2020 000 WTPZ41 KNHC 172111 CCA TCDEP1 Tropical Depression Twenty-One-E Discussion Number 1...Corrected NWS National Hurricane Center Miami FL EP212020 200 PM MST Tue Nov 17 2020 Corrected Daylight Time to Standard time Visible satellite imagery and recent ASCAT data indicate that the circulation of the area of low pressure located well south-southwest of Baja California has become better defined today. The associated convective activity has also become organized in a band around the western and southwestern portions of the circulation. Therefore, the system is being classified as a tropical depression with winds of 30 kt, as indicated by the scatterometer data and a T2.0 (30 kt) Dvorak classification from TAFB. The depression is currently located over SSTs of around 28 deg C, and within a low shear environment. These conditions are conducive for strengthening, but the surrounding mid-level environment is fairly dry which is likely to limit intensification. Most of the intensity guidance calls for the system to become a short-lived tropical storm, and so does the official forecast. After 24 hours, increasing upper-level westerly winds, cooler SSTs, and even less favorable thermodynamic conditions should cause the cyclone to weaken. The system is likely to become a remnant low in about 48 hours, and the global models show it degenerating into a trough of low pressure in 60-72 hours, which is also indicated in the NHC forecast. The initial motion estimate is 285/11 kt. A mid-level ridge that extends westward from northern Mexico over the eastern Pacific should steer the system west-northwestward for the next couple of days. After that time, the cyclone is likely to turn more westward as it weakens and is steered by the low-level trade wind flow. The track guidance is in good agreement, and the NHC forecast is near the middle of the guidance envelope. FORECAST POSITIONS AND MAX WINDS INIT 17/2100Z 15.2N 113.3W 30 KT 35 MPH 12H 18/0600Z 15.6N 114.9W 35 KT 40 MPH 24H 18/1800Z 16.2N 117.0W 35 KT 40 MPH 36H 19/0600Z 16.7N 119.1W 30 KT 35 MPH 48H 19/1800Z 17.1N 121.1W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 20/0600Z 17.2N 123.3W 20 KT 25 MPH...POST-TROP/REMNT LOW 72H 20/1800Z...DISSIPATED $$ Forecaster Brown
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Tropical Storm Iota Forecast Discussion Number 18
2020-11-17 21:43:31| National Hurricane Center (Atlantic)
Issued at 300 PM CST Tue Nov 17 2020 797 WTNT41 KNHC 172043 TCDAT1 Tropical Storm Iota Discussion Number 18 NWS National Hurricane Center Miami FL AL312020 300 PM CST Tue Nov 17 2020 The cloud pattern of Iota has slowly degraded during the day, with warming of the cloud tops, but it has remained fairly well organized for a system that's been over land for about 18 hours. The initial wind speed is lowered to 50 kt using the Decay-SHIPS guidance. Iota will encounter higher terrain soon while it moves westward at about 10 kt, so it should quickly weaken tonight, and it will probably degenerate into a weak low near El Salvador overnight. None of the available guidance show regeneration in the eastern Pacific, perhaps due to cooler SSTs with all of the recent gap wind events, and plenty of drier air in the vicinity. Iota is still expected to produce very serious hazards while it is over central America, including flash flooding and mud slides, These hazards could result in potentially catastrophic effects, especially when compounded upon Hurricane Eta's destruction from a couple of weeks ago. Key Messages: 1. Life-threatening flash flooding and river flooding is expected through Thursday across portions of Central America due to heavy rainfall from Iota. Flooding and mudslides across portions of Honduras, Nicaragua and Guatemala could be exacerbated by Hurricane Etas recent effects there, resulting in significant to potentially catastrophic impacts. 2. Strong winds, primarily close to the center of Iota and along the coast of Honduras, are still expected for the next several hours. FORECAST POSITIONS AND MAX WINDS INIT 17/2100Z 13.7N 86.2W 50 KT 60 MPH...INLAND 12H 18/0600Z 13.6N 87.8W 30 KT 35 MPH...POST-TROP/REMNT LOW 24H 18/1800Z...DISSIPATED $$ Forecaster Blake
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Tropical Depression Twenty-One-E Forecast Discussion Number 1
2020-11-17 21:43:01| National Hurricane Center (East Pacific)
Issued at 300 PM MDT Tue Nov 17 2020 916 WTPZ41 KNHC 172042 TCDEP1 Tropical Depression Twenty-One-E Discussion Number 1 NWS National Hurricane Center Miami FL EP212020 300 PM MDT Tue Nov 17 2020 Visible satellite imagery and recent ASCAT data indicate that the circulation of the area of low pressure located well south-southwest of Baja California has become better defined today. The associated convective activity has also become organized in a band around the western and southwestern portions of the circulation. Therefore, the system is being classified as a tropical depression with winds of 30 kt, as indicated by the scatterometer data and a T2.0 (30 kt) Dvorak classification from TAFB. The depression is currently located over SSTs of around 28 deg C, and within a low shear environment. These conditions are conducive for strengthening, but the surrounding mid-level environment is fairly dry which is likely to limit intensification. Most of the intensity guidance calls for the system to become a short-lived tropical storm, and so does the official forecast. After 24 hours, increasing upper-level westerly winds, cooler SSTs, and even less favorable thermodynamic conditions should cause the cyclone to weaken. The system is likely to become a remnant low in about 48 hours, and the global models show it degenerating into a trough of low pressure in 60-72 hours, which is also indicated in the NHC forecast. The initial motion estimate is 285/11 kt. A mid-level ridge that extends westward from northern Mexico over the eastern Pacific should steer the system west-northwestward for the next couple of days. After that time, the cyclone is likely to turn more westward as it weakens and is steered by the low-level trade wind flow. The track guidance is in good agreement, and the NHC forecast is near the middle of the guidance envelope. FORECAST POSITIONS AND MAX WINDS INIT 17/2100Z 15.2N 113.3W 30 KT 35 MPH 12H 18/0600Z 15.6N 114.9W 35 KT 40 MPH 24H 18/1800Z 16.2N 117.0W 35 KT 40 MPH 36H 19/0600Z 16.7N 119.1W 30 KT 35 MPH 48H 19/1800Z 17.1N 121.1W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 20/0600Z 17.2N 123.3W 20 KT 25 MPH...POST-TROP/REMNT LOW 72H 20/1800Z...DISSIPATED $$ Forecaster Brown
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Hurricane Iota Forecast Discussion Number 17
2020-11-17 15:41:27| National Hurricane Center (Atlantic)
Issued at 900 AM CST Tue Nov 17 2020 000 WTNT41 KNHC 171441 TCDAT1 Hurricane Iota Discussion Number 17 NWS National Hurricane Center Miami FL AL312020 900 AM CST Tue Nov 17 2020 Satellite images indicate that Iota continues to weaken over land with warming cloud tops near the center. It still has a small core, however, so the initial wind speed will be lowered to 65 kt on this advisory, in line with the Decay-SHIPS model. Further weakening is expected today as Iota moves westward at about 10 kt, with Iota becoming a tropical storm this afternoon, and a tropical depression tonight. Iota should degenerate into a remnant low near El Salvador by tomorrow due to the rugged terrain of central America. While the winds of Iota are weakening, there are still life- threatening hazards ongoing for central America, including flash flooding and mud slides, which could result in potentially catastrophic effects, especially when compounded upon Hurricane Eta's destruction from a couple of weeks ago. Key Messages: 1. Life-threatening flash flooding and river flooding is expected through Thursday across portions of Central America due to heavy rainfall from Iota. Flooding and mudslides across portions of Honduras, Nicaragua and Guatemala could be exacerbated by Hurricane Etas recent effects there, resulting in significant to potentially catastrophic impacts. 2. Strong winds, primarily close to the center of Iota and along the coasts of Nicaragua and Honduras, are still expected for the next several hours. FORECAST POSITIONS AND MAX WINDS INIT 17/1500Z 13.7N 85.2W 65 KT 75 MPH...INLAND 12H 18/0000Z 13.7N 86.7W 35 KT 40 MPH...INLAND 24H 18/1200Z 13.7N 88.8W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 19/0000Z...DISSIPATED $$ Forecaster Blake
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Hurricane Iota Forecast Discussion Number 16
2020-11-17 09:44:21| National Hurricane Center (Atlantic)
Issued at 400 AM EST Tue Nov 17 2020 000 WTNT41 KNHC 170844 TCDAT1 Hurricane Iota Discussion Number 16 NWS National Hurricane Center Miami FL AL312020 400 AM EST Tue Nov 17 2020 Iota made landfall as a Category 4 hurricane along the northeastern coast of Nicaragua around 0340 UTC, near the town of Haulover. Iota's landfall location was about 12 nmi south of where Category 4 Hurricane Eta made landfall earlier this month on November 3rd. Due to the previous damage caused by Eta, wind reports have been extremely limited. There was an amateur radio report from Club de Radio-Experimentadores de Nicaragua of 124 mph (200 Km/h) winds and roofs damaged in the town of Wilbi, Nicaragua. However, it is uncertain if these were sustained winds or wind gusts. At the Puerto Cabezas, Nicaragua, airport at 0253 UTC, a sustained wind of 72 kt (134 km/h) and a gust to 98 kt (182 km/h) were measured. The initial intensity of 90 kt is based on the Decay-SHIPS model's weakening rate for inland tropical cyclones, and the remnant eye feature still noted in infrared satellite imagery. Iota is moving westward, or 270/08 kt. Iota is expected to continue moving generally westward today into early Wednesday, as the cyclone moves along he southern periphery of a deep-layer subtropical ridge located over the northern Caribbean Sea, the Gulf of Mexico, and southeastern Mexico. The lower levels of the ridge are forecast to push southward behind a cold front, which will force Iota and its remnants west-southwestward across southern Honduras and El Salvador in the 24-36 hour period. Iota is expected to dissipate by 48 hours, with the remnant mid-level circulation possibly drifting westward into the eastern North Pacific basin. The new NHC track forecast is essentially just an extension of the previous advisory track, and closely follows a blend of the consensus models TVCN, NOAA-HCCA, and FSSE. Additional rapid weakening is forecast for the next 36 hours as Iota moves farther inland over the rugged terrain of Nicaragua and Honduras. The new NHC intensity forecast is similar to the previous advisory and closely follows the Decay-SHIPS intensity guidance. Although Hurricane Iota has moved inland, damaging winds are occurring inland, and also along the northeastern coast of Nicaragua, where a significant storm surge of 5-10 ft is still likely occurring. In addition to the destructive winds and storm surge, there will be the potential for up to 30 inches of rainfall. The situation is exacerbated by the fact that Iota is moving across the same general location that Category 4 Hurricane Eta did a little less than two weeks ago. Key Messages: 1. Iota is still a significant hurricane. Damaging winds and a life-threatening storm surge are expected along portions of the coast of northeastern Nicaragua during the next several hours, where a hurricane warning is in effect. 2. Life-threatening flash flooding and river flooding is expected through Thursday across portions of Central America due to heavy rainfall from Iota. Flooding and mudslides across portions of Honduras, Nicaragua and Guatemala could be exacerbated by Hurricane Etas recent effects there, resulting in significant to potentially catastrophic impacts. FORECAST POSITIONS AND MAX WINDS INIT 17/0900Z 13.7N 84.3W 90 KT 105 MPH...INLAND 12H 17/1800Z 13.8N 85.7W 55 KT 65 MPH...INLAND 24H 18/0600Z 13.8N 87.9W 35 KT 40 MPH...INLAND 36H 18/1800Z 13.7N 89.8W 20 KT 25 MPH...POST-TROP/INLAND 48H 19/0600Z...DISSIPATED $$ Forecaster Stewart
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