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Tropical Depression Carlos Forecast Discussion Number 15

2021-06-16 10:35:36| National Hurricane Center (East Pacific)

Issued at 1100 PM HST Tue Jun 15 2021 000 WTPZ43 KNHC 160835 TCDEP3 Tropical Depression Carlos Discussion Number 15 NWS National Hurricane Center Miami FL EP032021 1100 PM HST Tue Jun 15 2021 Carlos has maintained a small area of deep convection to the south and northeast of the well-defined low-level center of circulation. However, the convection has decreased in coverage and has become more linear over the past 3 h. Despite the ragged convective appearance in infrared satellite imagery, ASCAT-A/-B passes at 0438Z and 0554Z, respectively, indicated that the small cyclone was still producing winds of 28-29 kt in the northwestern quadrant. Therefore, the intensity is being kept at 30 kt for this advisory. Carlos is moving a little south of due west or 260/06 kt. As per the previous forecast discussion, a gradual westward turn is expected to occur later today, followed by a westward to west-northwestward motion thereafter as the cyclone weakens and becomes more vertically shallow, being steered more by the long-fetch easterly trade wind flow. The new NHC track forecast is essentially just an update of the previous advisory track and lies near a blend of the TVCE and NOAA-HCCA consensus track models. The only positive factor that Carlos has going for it is the warm water beneath the cyclone where sea-surface temperatures (SST) are 27.5 deg C. Surrounding the small cyclone, however, is a very dry and cool airmass, with stable stratocumulus clouds now wrapping into the system, while deep-layer vertical wind shear of more than 20 kt has been increasing from the west. Although SSTs are expected to be warm enough to sustain a tropical cyclone for the next few days, the unfavorable combination of strong shear and a drier airmass is expected to cause Carlos to weaken and degenerate into a remnant low by late today, if not sooner. The NHC intensity forecast is similar to the previous advisory, and closely follows the HCCA and IVCN intensity consensus models. FORECAST POSITIONS AND MAX WINDS INIT 16/0900Z 9.2N 135.0W 30 KT 35 MPH 12H 16/1800Z 9.2N 135.9W 25 KT 30 MPH 24H 17/0600Z 9.2N 137.1W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 17/1800Z 9.4N 138.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 18/0600Z 9.6N 139.7W 20 KT 25 MPH...POST-TROP/REMNT LOW 60H 18/1800Z 9.8N 141.1W 20 KT 25 MPH...POST-TROP/REMNT LOW 72H 19/0600Z...DISSIPATED $$ Forecaster Stewart

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