Tropical Storm Lala Forecast Discussion
|
Español: Aviso Publico Discusión |
592 WTPA42 PHFO 230244 TCDCP2 Tropical Storm Lala Discussion Number 43 NWS Central Pacific Hurricane Center Honolulu HI CP012026 Issued by NWS National Hurricane Center Miami FL 500 PM HST Sat Aug 22 2026 Lala has a good structure of curved convective bands surrounding a ragged and intermittent eye. However, the cloud tops are not cold, with tops of -50C to -55C confined to small areas near the center. The various satellite intensity estimates range from 45-65 kt and are trending slowly downward, while an earlier ASCAT overpass showed maximum winds between 50-55 kt. Based on these data and the possibility of undersampling of the ASCAT data, the initial intensity is reduced to 60 kt. Thus, Lala is downgraded to a tropical storm. The initial motion is 320/5 kt. During the forecast period, Lala should be steered by a low- to mid-level ridge to the north, with this feature expected to build northwestward due to a developing baroclinic trough over the far northwestern Pacific. This pattern should cause Lala to move on a general slow northwestward track. There is little change to the track guidance, and the new forecast track is similar to the previous forecast. Despite the high latitudes of the forecast, Lala is likely to stay well away from any baroclinic zones that could cause extratropical transition. The cyclone is expected to remain in an area of light to moderate shear for the next several days, so the intensity will be controlled mainly by sea surface temperatures and moisture. The storm has another 24 h over sea surface temperatures of 26C, after which the water gets colder along the forecast track. The new intensity forecast follows the trend of the guidance in showing a slow weakening over the next several days. As before, Lala is forecast to lose its convection and become post-tropical around 120 h as suggested by simulated satellite imagery from the GFS and ECMWF models. FORECAST POSITIONS AND MAX WINDS INIT 23/0300Z 31.5N 172.9W 60 KT 70 MPH 12H 23/1200Z 32.0N 173.5W 60 KT 70 MPH 24H 24/0000Z 32.7N 174.3W 55 KT 65 MPH 36H 24/1200Z 33.3N 174.8W 50 KT 60 MPH 48H 25/0000Z 33.9N 175.4W 50 KT 60 MPH 60H 25/1200Z 34.7N 176.2W 45 KT 50 MPH 72H 26/0000Z 35.4N 176.9W 45 KT 50 MPH 96H 27/0000Z 37.2N 178.4W 40 KT 45 MPH 120H 28/0000Z 39.1N 180.0E 35 KT 40 MPH...POST-TROPICAL $$ Forecaster Beven