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Tropical Storm Cristina Forecast Discussion Number 14
2020-07-10 04:34:35| National Hurricane Center (East Pacific)
Issued at 900 PM MDT Thu Jul 09 2020 000 WTPZ45 KNHC 100234 TCDEP5 Tropical Storm Cristina Discussion Number 14 NWS National Hurricane Center Miami FL EP052020 900 PM MDT Thu Jul 09 2020 Cristina's satellite presentation has degraded somewhat during the past several hours, with deep convection on the wane and some evidence of dry air near the center. Still, microwave data does show a large banding pattern with a mid-level core present, suggesting there might be more than meets the eye than just conventional satellite imagery. The current intensity of the storm is difficult to ascertain, as estimates from generally credible techniques range from 45 kt to 77 kt on this package. It is probably best to keep the initial wind speed 60 kt for now, and we will see if the intensity becomes more clear overnight. The storm has about a day over marginally warm waters in light shear conditions before SSTs begin to cool, and eventually more significant dry air is entrained into the inner core. Thus some strengthening is anticipated on Friday, and Cristina should start a gradual weakening over the weekend through early next week. The cyclone should have a challenging time producing convection over sub-23C waters, which happens in about 72 hours, so that is the time chosen for post-tropical transition. This is earlier than the previous forecast and best matches a GFS/ECMWF blend. No significant changes were made to the intensity forecast with guidance in good agreement at this time. Christina continues moving west-northwestward at about 10 kt. A mid-level ridge centered over the southwestern U.S. is expected to strengthen over the next day or so, which should force the storm in a similar direction but with a slight increase in forward speed. Over the weekend, as the cyclone weakens, a gradual turn to the west is expected. The forecast track is a little slower than the previous one at long range, otherwise the track is basically an update of the earlier track prediction. FORECAST POSITIONS AND MAX WINDS INIT 10/0300Z 18.4N 111.9W 60 KT 70 MPH 12H 10/1200Z 19.1N 113.5W 65 KT 75 MPH 24H 11/0000Z 20.1N 116.1W 65 KT 75 MPH 36H 11/1200Z 20.8N 118.9W 55 KT 65 MPH 48H 12/0000Z 21.3N 121.7W 45 KT 50 MPH 60H 12/1200Z 21.6N 124.4W 40 KT 45 MPH 72H 13/0000Z 21.8N 127.0W 35 KT 40 MPH...POST-TROPICAL 96H 14/0000Z 22.2N 132.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 15/0000Z 22.5N 138.0W 25 KT 30 MPH...POST-TROP/REMNT LOW $$ Forecaster Blake
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