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Tropical Storm Cristina Forecast Discussion Number 5
2020-07-07 22:33:53| National Hurricane Center (East Pacific)
Issued at 400 PM CDT Tue Jul 07 2020 667 WTPZ45 KNHC 072033 TCDEP5 Tropical Storm Cristina Discussion Number 5 NWS National Hurricane Center Miami FL EP052020 400 PM CDT Tue Jul 07 2020 Cristina is still being affected by some northeasterly vertical wind shear as visible satellite imagery shows that the center is located near the northeastern edge of the large curved convective band. The various subjective and objective satellite intensity estimates range from 35 to 45 kt, and a recent ASCAT overpass revealed a small area of 35-40 kt wind vectors near the center. Based on these data, the initial intensity is set at 40 kt. The moderate vertical wind shear over the system is forecast to abate over the next 12-24 hours. This, along with SSTs of 28-29C, should allow for strengthening and Cristina is still forecast to become a hurricane in a day or two. Although Cristina has not strengthened as much as anticipated over the past 24 hours, with the more favorable atmospheric conditions anticipated beginning Wednesday, a period of steady to rapid strengthening is still possible. The latest intensity guidance shows a slightly lower peak wind speed than before, so the new NHC intensity forecast has been nudged in that direction. After 72 hours, Cristina will be moving over cooler waters and steady weakening is expected later in the period. Satellite fixes show that Cristina is moving west-northwestward or 305/11 kt. There has been no significant change to the track foreast reasoning. Cristina should continue on a west-northwestward heading over the next several days to the south of a large mid-level ridge over the southwestern United States. The overall track guidance envelop has shifted slightly northward, so the NHC track forecast has been adjusted accordingly. The new track forecast lies between the previous official foreast and the most recent consensus aids. FORECAST POSITIONS AND MAX WINDS INIT 07/2100Z 13.0N 103.8W 40 KT 45 MPH 12H 08/0600Z 13.8N 105.3W 45 KT 50 MPH 24H 08/1800Z 15.0N 107.2W 55 KT 65 MPH 36H 09/0600Z 16.1N 109.2W 65 KT 75 MPH 48H 09/1800Z 17.0N 110.9W 75 KT 85 MPH 60H 10/0600Z 18.0N 112.7W 85 KT 100 MPH 72H 10/1800Z 19.0N 114.9W 85 KT 100 MPH 96H 11/1800Z 20.5N 119.8W 70 KT 80 MPH 120H 12/1800Z 21.8N 125.0W 50 KT 60 MPH $$ Forecaster Brown
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