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Tropical Storm Wilfred Forecast Discussion Number 1
2020-09-18 16:35:11| National Hurricane Center (Atlantic)
Issued at 1100 AM AST Fri Sep 18 2020 000 WTNT43 KNHC 181435 TCDAT3 Tropical Storm Wilfred Discussion Number 1 NWS National Hurricane Center Miami FL AL232020 1100 AM AST Fri Sep 18 2020 Satellite images indicate that the broad area of low pressure over the eastern Atlantic has become better-defined this morning. In addition, scatterometer data also show a closed circulation, albeit with some rain contamination causing some noise near the center. The initial wind speed is set to 35 kt, in accordance with scatterometer data from last night (this morning's data missed the eastern side of the storm). Thus Wilfred has formed, continuing the record-setting pace of the 2020 hurricane season since it is the earliest 21st named storm on record, about 3 weeks earlier than Vince of 2005. Further intensification is possible during the next day or two before a large upper-level trough is forecast to drop into the path of the storm and stay there for at least a few days. That should promote weakening due to a substantial increase in shear, and most of the global models show this tropical cyclone opening up into a trough by day 5. The official forecast follows this scenario, and the NHC intensity forecast is a blend of the consensus and corrected-consensus aids. Wilfred is moving west-northwestward at about 15 kt. The storm is forecast to continue this motion for the next several days, owing to steering from the low- to middle-level subtropical ridge. The guidance is in fair agreement, and the official forecast is near or west of the consensus at all times, leaning in the direction of the HCCA corrected-consensus. I should mention that if Wilfred intensifies more than expected, it would probably move a bit right of the forecast track for a while due to the expected southwesterly flow at higher levels, before eventually turning back west-northwestward. FORECAST POSITIONS AND MAX WINDS INIT 18/1500Z 11.9N 32.4W 35 KT 40 MPH 12H 19/0000Z 12.6N 34.6W 40 KT 45 MPH 24H 19/1200Z 13.5N 37.5W 40 KT 45 MPH 36H 20/0000Z 14.5N 40.2W 40 KT 45 MPH 48H 20/1200Z 15.6N 42.8W 35 KT 40 MPH 60H 21/0000Z 16.7N 45.5W 30 KT 35 MPH 72H 21/1200Z 17.3N 47.5W 30 KT 35 MPH 96H 22/1200Z 18.0N 50.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 23/1200Z...DISSIPATED $$ Forecaster Blake
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