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Tropical Depression Wilfred Forecast Discussion Number 9
2020-09-20 16:50:28| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Sun Sep 20 2020 000 WTNT43 KNHC 201450 TCDAT3 Tropical Depression Wilfred Discussion Number 9 NWS National Hurricane Center Miami FL AL232020 1100 AM AST Sun Sep 20 2020 First-light visible imagery of Wilfred shows a well-defined center south of widespread - but not very well banded - deep convection. The improved positioning this morning allows for a more confident assessment of its movement toward the west-northwest at 17 kt. As the system slowly winds down, it will be increasingly steered by the low-level flow indicating a slower movement toward the west or west-northwest until dissipation. The new track forecast is slightly farther west due to the faster initial motion within 36 hours, then slightly farther east afterward based upon the TVCN track consensus approach. While the ASCAT scatterometer passes this morning missed Wilfred's center, ASCAT-B observed 30 kt peak winds in its northeastern quadrant. This value is used as the initial intensity, consistent with both SAB and TAFB's Dvorak classifications. The combination of outflow from Hurricane Teddy as well as winds on the southern side of an impinging upper-level trough are causing about 20 kt vertical shear from the west-northwest. This shear should increase over the next couple of days as Wilfred gets into closer proximity with the trough. The strong shear and dry mid-level humidities should continue to cause a reduction of the deep convection and lead to the system becoming a remnant low in a couple of days followed within another day or so by dissipation. All statistical and dynamical intensity guidance is in agreement with this scenario. Alternatively, Wilfred could become a remnant low sooner, if the convection ceases later today or Monday. FORECAST POSITIONS AND MAX WINDS INIT 20/1500Z 15.7N 44.2W 30 KT 35 MPH 12H 21/0000Z 16.2N 46.3W 30 KT 35 MPH 24H 21/1200Z 16.5N 48.4W 25 KT 30 MPH 36H 22/0000Z 16.8N 50.0W 25 KT 30 MPH 48H 22/1200Z 17.0N 51.5W 20 KT 25 MPH...POST-TROP/REMNT LOW 60H 23/0000Z 17.2N 52.7W 20 KT 25 MPH...POST-TROP/REMNT LOW 72H 23/1200Z...DISSIPATED $$ Forecaster Landsea
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