je.st
news
Tag: discussion
Tropical Storm Bill Forecast Discussion Number 3
2021-06-15 04:38:38| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Mon Jun 14 2021 000 WTNT42 KNHC 150238 TCDAT2 Tropical Storm Bill Discussion Number 3 NWS National Hurricane Center Miami FL AL022021 1100 PM AST Mon Jun 14 2021 Deep convection has increased in a cluster to the northeast of the estimated center. Scatterometer measurements showed a couple of 40-41 kt vectors over the southeastern quadrant of the cyclone. On this basis, the estimated intensity is increased to 40 kt, which makes this the second tropical storm of the season, albeit a rather high-latitude one. The system is in an environment of fairly strong southwesterly shear, but the diffluent upper-level flow has apparently contributed to some strengthening in a seemingly hostile environment. Some additional short-term strengthening could occur but by 36 hours, the cyclone should merge with a baroclinic zone while approaching Newfoundland and become extratropical. This transition is also shown by the FSU cyclone phase analyses of the GFS model fields. Bill is moving fairly swiftly northeastward, or 055/20 kt. The track forecast appears to be straightforward. The flow ahead of a large mid-tropospheric trough near the United States east coast should accelerate the system northeastward for the next day or two, and until the system dissipates. The NHC track forecast is similar to the previous one and not far from the model consensus. FORECAST POSITIONS AND MAX WINDS INIT 15/0300Z 36.7N 69.8W 40 KT 45 MPH 12H 15/1200Z 38.9N 65.1W 45 KT 50 MPH 24H 16/0000Z 42.6N 59.6W 40 KT 45 MPH 36H 16/1200Z 46.5N 54.5W 35 KT 40 MPH...POST-TROP/EXTRATROP 48H 17/0000Z...DISSIPATED $$ Forecaster Pasch
Tags: number
discussion
bill
storm
Tropical Depression Carlos Forecast Discussion Number 10
2021-06-15 04:37:11| National Hurricane Center (East Pacific)
Issued at 800 PM PDT Mon Jun 14 2021 505 WTPZ43 KNHC 150237 TCDEP3 Tropical Depression Carlos Discussion Number 10 NWS National Hurricane Center Miami FL EP032021 800 PM PDT Mon Jun 14 2021 Carlos is barely holding on as a tropical cyclone. The depression was completely devoid of convection for several hours this afternoon with a completely exposed low-level center, but recently a small burst of convection pulsed near and to the west-southwest of the low-level center. Given the unfavorable environment the system is embedded within, this activity is likely to be short-lived. Carlos remains a 30-kt tropical depression with this advisory, in best agreement with the subjective Dvorak classification received from TAFB. The depression is still moving west-southwestward, or 250/10 kt. This general motion will continue for the next 24 h, followed by a westward motion to the south of a low- to mid-level ridge that should continue through Carlos' dissipation. The latest NHC track forecast track is somewhat faster and slightly south of the previous one, in agreement with the latest multi-model consensus. Despite reasonably warm sea-surface temperatures along its track, Carlos is expected to continue battling intrusions of dry air from its surrounding environment as well as increasing west-southwesterly shear. Therefore, the future looks bleak for Carlos, and the system appears likely to degenerate to a remnant low within the next 24 h or so. This forecast is consistent with the latest GFS and ECMWF simulated satellite imagery, which shows little potential for any sustained, organized convection going forward. The majority of the global guidance now suggests that the remnant low will dissipate by Friday night, which is reflected in this forecast advisory. FORECAST POSITIONS AND MAX WINDS INIT 15/0300Z 10.5N 130.8W 30 KT 35 MPH 12H 15/1200Z 10.1N 132.1W 25 KT 30 MPH 24H 16/0000Z 9.8N 133.6W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 16/1200Z 9.7N 135.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 17/0000Z 9.7N 136.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 17/1200Z 9.8N 137.6W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 18/0000Z 10.0N 139.0W 20 KT 25 MPH...POST-TROP/REMNT LOW 96H 19/0000Z...DISSIPATED $$ Forecaster Reinhart/Pasch
Tags: number
discussion
carlos
tropical
Tropical Depression Carlos Forecast Discussion Number 9
2021-06-14 22:42:39| National Hurricane Center (East Pacific)
Issued at 200 PM PDT Mon Jun 14 2021 000 WTPZ43 KNHC 142042 TCDEP3 Tropical Depression Carlos Discussion Number 9 NWS National Hurricane Center Miami FL EP032021 200 PM PDT Mon Jun 14 2021 The convective burst that occurred this morning near the center of Carlos has been gradually dissipating throughout the day. Satellite imagery shows dry and stable air being entrained into the circulation and the cyclone's center has become partially exposed. The latest Dvorak estimate from TAFB indicates that Carlos has weakened to a 30-kt tropical depression, and this will be the initial advisory intensity. Carlos is moving west-southwest at 8 kt, steered by a low- to mid-level ridge to its north. Most of the track guidance is in good agreement on keeping this ridge intact over the next several days, forcing Carlos on the same west-southwest trajectory for the next day or so, followed by a gradual turn to the west by midweek. The latest NHC track forecast was adjusted to be a little faster and to the south of the previous one to better match the trend in the guidance, and is now near the northern end of the multi-model consensus. The depression is forecast to continue to traverse a dry and stable airmass for the remainder of the week, and ongoing intrusions of this air should inhibit the cyclone from producing long-lived convection. The lack of deep convection should cause Carlos to continue a slow weakening trend and eventually degenerate into a remnant low. The official NHC forecast calls for this transition to to occur by 48 h. However, it could occur sooner than this if organized deep convection fails to regenerate. FORECAST POSITIONS AND MAX WINDS INIT 14/2100Z 10.9N 130.0W 30 KT 35 MPH 12H 15/0600Z 10.5N 131.1W 30 KT 35 MPH 24H 15/1800Z 10.1N 132.6W 30 KT 35 MPH 36H 16/0600Z 9.9N 134.0W 25 KT 30 MPH 48H 16/1800Z 9.9N 135.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 17/0600Z 9.9N 136.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 17/1800Z 10.1N 137.5W 20 KT 25 MPH...POST-TROP/REMNT LOW 96H 18/1800Z 10.3N 140.0W 20 KT 25 MPH...POST-TROP/REMNT LOW 120H 19/1800Z...DISSIPATED $$ Forecaster Latto
Tags: number
discussion
carlos
tropical
Tropical Depression Two Forecast Discussion Number 2
2021-06-14 22:35:38| National Hurricane Center (Atlantic)
Issued at 500 PM EDT Mon Jun 14 2021 000 WTNT42 KNHC 142035 TCDAT2 Tropical Depression Two Discussion Number 2 NWS National Hurricane Center Miami FL AL022021 500 PM EDT Mon Jun 14 2021 Deep convection has weakened some this afternoon near the center of the depression, and the cloud pattern definitely is showing signs of shear. However, visible satellite imagery still indicates that it has a tight circulation, and past experience suggests with that kind of low-level structure, the depression is close to becoming a tropical storm. None of the conventional intensity estimates, however, show the system as a storm yet, and since scatterometer data also totally missed this morning, 30 kt will stay as the initial wind speed. No change is made to the intensity forecast from the last advisory, with the system having about 24 hours of time over marginally warm water to intensify. Afterwards, the cyclone should quickly lose convection and transition into an extratropical low, and dissipate near Newfoundland. This forecast is somewhat higher than the the guidance consensus on this cycle, but given that I was on the low side on the first forecast compared to guidance, I decided to hold steady and not waffle like the models are prone to doing. The depression is moving northeastward at about 16 kt, a little slower than before. Model guidance is in excellent agreement on large trough over eastern North America causing the depression to accelerate quite a bit in that general direction during the next day or two. The northeastward track is forecast to continue until the system dissipates near Newfoundland on Wednesday while it is absorbed by a larger extratropical low. The model guidance has shifted a little south of the previous advisory, and the NHC track prediction is shifted in that direction. FORECAST POSITIONS AND MAX WINDS INIT 14/2100Z 35.5N 72.0W 30 KT 35 MPH 12H 15/0600Z 37.5N 68.3W 40 KT 45 MPH 24H 15/1800Z 40.9N 62.5W 45 KT 50 MPH 36H 16/0600Z 45.0N 57.0W 40 KT 45 MPH...POST-TROP/EXTRATROP 48H 16/1800Z...DISSIPATED $$ Forecaster Blake
Tags: number
discussion
tropical
depression
Tropical Depression Two Forecast Discussion Number 1
2021-06-14 16:50:49| National Hurricane Center (Atlantic)
Issued at 1100 AM EDT Mon Jun 14 2021 000 WTNT42 KNHC 141442 TCDAT2 Tropical Depression Two Discussion Number 1 NWS National Hurricane Center Miami FL AL022021 1100 AM EDT Mon Jun 14 2021 Satellite and radar images show that the low pressure area that NHC has been following since yesterday off the coast of North Carolina has become better organized, with a small central dense overcast over the center and more prominent banding features. The low also has advanced ahead of a nearby diffuse stationary front, with that boundary lying northwest of the center. Considering the small core of the low, ample deep convection, satellite pattern, and that the low is feeding off of the thunderstorm activity (and not the front) -- it is now classified as a tropical depression. The initial intensity is set to 30 kt, which is our best estimate assuming strengthening from the 20-25 kt overnight ASCAT and surface observations. The depression is moving northeastward at about 18 kt. A large mid-latitude trough digging across eastern North America should cause the cyclone to continue moving generally northeastward, but faster, over the next couple of days. In about 48 hours, the system is forecast to dissipate near Newfoundland as it is absorbed by a larger extratropical low. Model guidance is in very good agreement on this scenario, and the NHC forecast lies near the track consensus. The depression has about 24 hours over marginally warm waters in low-to-moderate shear to strengthen before it moves north of the Gulf Stream and decays. Almost all of the intensity guidance shows the system becoming a tropical storm tonight, and considering the healthy initial structure, the official forecast follows that guidance. The low should lose tropical characteristics in about 36 hours due to very cold waters and dissipate near Newfoundland in about 2 days. FORECAST POSITIONS AND MAX WINDS INIT 14/1500Z 35.0N 73.7W 30 KT 35 MPH 12H 15/0000Z 36.6N 70.9W 40 KT 45 MPH 24H 15/1200Z 39.8N 65.3W 45 KT 50 MPH 36H 16/0000Z 43.6N 59.7W 40 KT 45 MPH...POST-TROP/EXTRATROP 48H 16/1200Z...DISSIPATED $$ Forecaster Blake
Tags: number
discussion
tropical
depression
Sites : [109] [110] [111] [112] [113] [114] [115] [116] [117] [118] [119] [120] [121] [122] [123] [124] [125] [126] [127] [128] next »