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Tropical Depression Omar Forecast Discussion Number 11

2020-09-03 10:45:14| National Hurricane Center (Atlantic)

Issued at 500 AM AST Thu Sep 03 2020 000 WTNT45 KNHC 030845 TCDAT5 Tropical Depression Omar Discussion Number 11 NWS National Hurricane Center Miami FL AL152020 500 AM AST Thu Sep 03 2020 Omar continues to produce bursts of deep convection with the center occasionally obscured beneath the northern edge of the convective canopy. Based on last evening's ASCAT pass and a recent classification of T2.0 from TAFB, the initial intensity remains 30 kt. Amazingly, 50 kt of north-northwesterly shear has not been enough to prevent deep convection from developing, likely because Omar remains in an unstable thermodynamic environment and over sea surface temperatures of 27-28 degrees Celsius. These conditions are not expected to become less conducive for convective development, and the only thing that will likely make it harder for Omar to maintain convection will be the shear vector becoming increasingly out of phase with the storm motion vector during the next couple of days. With the current round of convection ongoing, it may take a little while longer for Omar to degenerate to a remnant low, and that occurrence has been pushed to 24 hours in the NHC forecast. Dissipation has been moved to 60 hours since all global models indicate that the remnant low's circulation should open up into a trough by then. Omar is moving eastward (090/12 kt) along the northern periphery of the subtropical ridge. A general eastward motion should continue for the next 24 hours, with Omar then turning toward the northeast by 48 hours ahead of an approaching cold front. The NHC track forecast is down the middle of the tightly packed guidance suite, and this new prediction is very close to the previous forecast. FORECAST POSITIONS AND MAX WINDS INIT 03/0900Z 36.3N 62.4W 30 KT 35 MPH 12H 03/1800Z 36.0N 60.3W 30 KT 35 MPH 24H 04/0600Z 35.8N 58.4W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 04/1800Z 36.1N 57.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 05/0600Z 37.2N 55.8W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 05/1800Z...DISSIPATED $$ Forecaster Berg

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Tropical Storm Nana Forecast Discussion Number 9

2020-09-03 10:44:38| National Hurricane Center (Atlantic)

Issued at 400 AM CDT Thu Sep 03 2020 457 WTNT41 KNHC 030844 TCDAT1 Tropical Storm Nana Discussion Number 9 NWS National Hurricane Center Miami FL AL162020 400 AM CDT Thu Sep 03 2020 Nana made landfall on the coast of Belize about 45 n mi south of Belize City around 0600 UTC today. It is estimated to be located inland and weakening over the southern part of that country with maximum winds of no more than 60 kt at this time. The small circulation will be moving over mountainous terrain today and tonight, so rapid weakening is likely. The official forecast is similar to the Decay-SHIPS intensity guidance, and calls for the system to degenerate into a remnant low by Friday. Although the remnants of Nana are forecast to move into the east Pacific in about 36 hours, the model guidance is in good agreement that conditions in that area will not be conducive for regeneration. The tropical cyclone continues to move a little south of west, or around 255/13 kt. A low- to mid-level ridge to the north of Nana should keep it moving on a west to west-southwestward track during the next day or so. The NHC track forecast is similar to the previous one, and on the northern side of the guidance envelope. KEY MESSAGES: 1. Tropical storm conditions will continue within the warning areas in Belize, Mexico, Guatemala, and the Bay Islands of Honduras this morning. Storm surge along the Belize coast will subside this morning as Nana moves farther inland. 2. Heavy rainfall with isolated maximum amounts as high as 8 to 12 inches could result in flash flooding in Belize, Guatemala, and portions of southeastern Mexico and the Yucatan Peninsula. FORECAST POSITIONS AND MAX WINDS INIT 03/0900Z 16.7N 88.8W 60 KT 70 MPH...INLAND 12H 03/1800Z 16.4N 90.7W 45 KT 50 MPH...INLAND 24H 04/0600Z 15.8N 93.0W 25 KT 30 MPH...INLAND 36H 04/1800Z 15.3N 95.2W 20 KT 25 MPH...POST-TROP/REMNT LOW 48H 05/0600Z...DISSIPATED $$ Forecaster Pasch

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Hurricane Nana Forecast Discussion Number 8

2020-09-03 04:53:09| National Hurricane Center (Atlantic)

Issued at 1000 PM CDT Wed Sep 02 2020 000 WTNT41 KNHC 030252 TCDAT1 Hurricane Nana Discussion Number 8 NWS National Hurricane Center Miami FL AL162020 1000 PM CDT Wed Sep 02 2020 After the center of Nana nearly became exposed during the late afternoon, a new burst of convection developed near and to the south of the center which has resulted in strengthening this evening. Very recently received data from an Air Force Reserve reconnaissance aircraft has indicated that Nana has become a hurricane. The plane has measured a peak 700-mb flight-level wind of 72 kt to the north of the center, and peak SFMR winds of 62 kt earlier this evening. These data support an initial intensity of 65 kt, making Nana the fifth hurricane of the 2020 Atlantic basin hurricane season. Since Nana should make landfall along the coast of Belize within the next several hours, little additional strengthening is expected before the center crosses the coast. Rapid weakening will occur after landfall, and the new 12 through 36 hour intensity forecast reflects this. The low-level center is likely to dissipate over mountainous terrain within 48 hours, if not sooner. Nana is moving just south of due west at about 265/14 kt. A low- to mid-level ridge to the north of Nana should keep it moving on a west-southwestward motion during the next day or so. The guidance enveloped has shifted slightly southward and the new NHC track forecast has been adjusted accordingly. KEY MESSAGES: 1. Hurricane conditions and a dangerous storm surge will spread onshore along portions of the coast of Belize within the Hurricane Warning area through early Thursday. 2. Tropical storm conditions are expected in the tropical storm warning areas in Belize, the Bay Islands, Guatemala, and the Yucatan Peninsula of Mexico through early Thursday. 3. Heavy rainfall with isolated maximum amounts as high as 8 to 12 inches could result in flash flooding in Belize, Guatemala, and portions of southeastern Mexico and the Yucatan Peninsula. FORECAST POSITIONS AND MAX WINDS INIT 03/0300Z 17.0N 87.5W 65 KT 75 MPH 12H 03/1200Z 16.8N 89.2W 50 KT 60 MPH...INLAND 24H 04/0000Z 16.4N 91.6W 30 KT 35 MPH...INLAND 36H 04/1200Z 16.0N 93.9W 20 KT 25 MPH...POST-TROP/REMNT LOW 48H 05/0000Z...DISSIPATED $$ Forecaster Brown

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Tropical Depression Omar Forecast Discussion Number 10

2020-09-03 04:33:39| National Hurricane Center (Atlantic)

Issued at 1100 PM AST Wed Sep 02 2020 000 WTNT45 KNHC 030233 TCDAT5 Tropical Depression Omar Discussion Number 10 NWS National Hurricane Center Miami FL AL152020 1100 PM AST Wed Sep 02 2020 A brief and small burst of convection developed near the center of Omar early this evening, only to be quickly sheared well to the southeast of the exposed low-level center. Any new convection that developed during the day has been smaller in coverage and shorter lived, and this trend is expected to continue. The initial intensity is being held at 30 kt based on a recent ASCAT overpass showing several peak 30-kt wind vectors in the southern semicircle. There is no change to the intensity forecast reasoning. Ongoing wind shear of 40-50 kt should not allow any developing convection to persist near Omar's center, and the depression should degenerate to a remnant low sometime on Thursday. This scenario is in agreement with the global model forecasts. A few days from now, the remnant low should dissipate as it becomes absorbed by a larger approaching mid-latitude frontal system. Omar continues to move east at around 13 kt, to the north of a subtropical ridge. An east or just south-of-east motion is forecast through Friday. After that time, the remnants of Omar should turn east-northeastward to northeastward ahead of the approaching mid-latitude frontal system. The latest NHC track forecast is very close to the previous one and is also near the various consensus aids. FORECAST POSITIONS AND MAX WINDS INIT 03/0300Z 36.1N 64.1W 30 KT 35 MPH 12H 03/1200Z 36.0N 62.0W 30 KT 35 MPH...POST-TROP/REMNT LOW 24H 04/0000Z 35.7N 59.9W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 04/1200Z 35.5N 58.2W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 05/0000Z 35.9N 57.2W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 05/1200Z 36.5N 56.1W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 06/0000Z...DISSIPATED $$ Forecaster Latto

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Tropical Depression Omar Forecast Discussion Number 9

2020-09-02 22:38:35| National Hurricane Center (Atlantic)

Issued at 500 PM AST Wed Sep 02 2020 000 WTNT45 KNHC 022038 TCDAT5 Tropical Depression Omar Discussion Number 9 NWS National Hurricane Center Miami FL AL152020 500 PM AST Wed Sep 02 2020 Conventional satellite imagery shows that Omar's cloud pattern is rapidly deteriorating, and the surface circulation center has become quite ill-defined. This morning's METOP-A/B scatterometer passes revealed only a few 33 kt winds well to the southeast of the center and it's reasonable to determine that those winds are no longer present. Therefore, the initial intensity is lowered to 30 kt for this advisory and is further supported by the subjective satellite intensity T-numbers from TAFB and SAB. The latest global model runs agree with the depression degenerating to a remnant low in 24 hours, or less, and the NHC intensity forecast follows suit. Dissipation of the remnant low should occur no later than Saturday evening. Omar's initial motion is estimated to be due east, or 090/13 kt, within the mid-latitude westerlies north of a subtropical ridge stretching east to west over the central Atlantic. Omar should continue moving eastward through Friday, although a couple of the global models are showing a track a bit more east-southeastward. Around the 60 hour period, the remnant low is expected to reduce in forward speed, and turn toward the east-northeast in response to an approaching baroclinic system entering the northwest Atlantic. The NHC forecast is nudged just a little to the right of the previous one, and lies close to the HCCA and TVCA consensus models. FORECAST POSITIONS AND MAX WINDS INIT 02/2100Z 36.1N 65.7W 30 KT 35 MPH 12H 03/0600Z 36.1N 63.6W 30 KT 35 MPH 24H 03/1800Z 36.0N 61.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 04/0600Z 35.7N 59.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 04/1800Z 35.7N 57.8W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 05/0600Z 35.9N 56.9W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 05/1800Z...DISSIPATED $$ Forecaster Roberts

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