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Tropical Storm Marty Forecast Discussion Number 5
2021-08-24 10:39:03| National Hurricane Center (East Pacific)
Issued at 200 AM PDT Tue Aug 24 2021 000 WTPZ43 KNHC 240838 TCDEP3 Tropical Storm Marty Discussion Number 5 NWS National Hurricane Center Miami FL EP132021 200 AM PDT Tue Aug 24 2021 Satellite imagery indicates that Marty is currently a swirl of low-level clouds with no associated convection, with this likely due to a combination of northeasterly vertical shear and marginal sea surface temperatures. Recent ASCAT data shows maximum winds of 30-35 kt over a small area in the northern semicircle, so the initial intensity is reduced to 35 kt. The initial motion is still westward, but slower than before, at 270/11 kt. The subtropical ridge to the north of Marty will continue to steer the cyclone generally westward over the next day or two. After that, the weakening cyclone is expected to turn west- southwestward during the latter part of the week within the low-level trade wind flow. The new forecast track is similar to, but a little slower than the previous forecast, and it lies near the various consensus models. Although the current shear is forecast to diminish, a combination of decreasing sea surface temperatures and a dryer air mass along the forecast track should cause continued gradual weakening. The new intensity forecast shows the system weakening to a depression in about 24 h and degenerating to a remnant low by 48 h. If convection does not re-develop near the center, both of these events could occur earlier than forecast. FORECAST POSITIONS AND MAX WINDS INIT 24/0900Z 20.6N 117.0W 35 KT 40 MPH 12H 24/1800Z 20.6N 118.7W 35 KT 40 MPH 24H 25/0600Z 20.6N 120.9W 30 KT 35 MPH 36H 25/1800Z 20.7N 122.8W 25 KT 30 MPH 48H 26/0600Z 20.6N 124.8W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 26/1800Z 20.4N 127.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 27/0600Z 19.8N 129.5W 20 KT 25 MPH...POST-TROP/REMNT LOW 96H 28/0600Z 18.5N 134.5W 20 KT 25 MPH...POST-TROP/REMNT LOW 120H 29/0600Z...DISSIPATED $$ Forecaster Beven
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