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Tropical Depression Five-E Forecast Discussion Number 1

2020-07-06 22:38:29| National Hurricane Center (East Pacific)

Issued at 400 PM CDT Mon Jul 06 2020 208 WTPZ45 KNHC 062038 TCDEP5 Tropical Depression Five-E Discussion Number 1 NWS National Hurricane Center Miami FL EP052020 400 PM CDT Mon Jul 06 2020 Satellite imagery shows that deep convection associated with the low pressure area south of Mexico has become significantly better organized since this morning. ASCAT data from earlier this afternoon suggested that the circulation was still somewhat elongated, but since that time low cloud motions indicate that the circulation has become better defined. The scatterometer data also revealed believable wind vectors of at least 30 kt, with higher rain-inflated vectors within the deep convection. Based on these data, advisories are being initiated on a 30-kt tropical depression at this time. The depression is located within a favorable environment consisting of low vertical wind shear, warm sea-surface temperatures, and a moist atmosphere. As a result, steady strengthening is anticipated over the next several days, and the NHC forecast calls for the cyclone to become a hurricane in about 48 hours. The NHC intensity forecast is in best agreement with the intensity consensus aids IVCN and HCCA, but is not quite as bullish as the SHIPS guidance. Given the anticipated low wind shear conditions over the next few days, a period of rapid strengthening is possible, and this intensity forecast could be somewhat conservative. The cyclone is expected to move over cooler waters in about 96 hours, which should cause weakening by the end of the period. Since the depression is still in its formative stage, the initial motion is a somewhat uncertain 295/11 kt. The depression is being steered west-northwestward to the south of a large mid-level ridge located over the south-central United States. A general west-northwestward heading about around the same forward speed is expected over the next several days. The dynamical model guidance is in fairly good agreement on this scenario and the NHC track forecast lies near the various consensus aids. FORECAST POSITIONS AND MAX WINDS INIT 06/2100Z 10.5N 99.7W 30 KT 35 MPH 12H 07/0600Z 11.2N 101.1W 35 KT 40 MPH 24H 07/1800Z 12.1N 103.4W 45 KT 50 MPH 36H 08/0600Z 13.0N 105.5W 55 KT 65 MPH 48H 08/1800Z 14.1N 107.4W 65 KT 75 MPH 60H 09/0600Z 15.0N 109.0W 75 KT 85 MPH 72H 09/1800Z 15.7N 110.7W 85 KT 100 MPH 96H 10/1800Z 17.2N 114.1W 85 KT 100 MPH 120H 11/1800Z 18.8N 118.7W 70 KT 80 MPH $$ Forecaster Brown

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