000 AXPZ20 KNHC 190942 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Thu Aug 19 2021 Tropical Weather Discussion for the eastern Pacific Ocean from 03.4S to 30N, east of 120W including the Gulf of California, and from the Equator to 30N, between 120W and 140W. The following information is based on satellite imagery, weather observations, radar, and meteorological analysis. Based on 0600 UTC surface analysis and satellite imagery through 0900 UTC. ...SPECIAL FEATURES... Hurricane Linda is centered near 19.7N 136.2W at 19/0900 UTC moving WNW at 15 kt. Estimated minimum central pressure is 983 mb. Maximum sustained wind speed is 75 kt with gusts to 90 kt. Peak seas are currently near 27 ft and are expected to diminish slightly by late this afternoon to 24 ft, as the system crosses 140W. Scattered moderate convection is present within 90 nm northeast and 45 nm southwest of the center of Linda. The same motion is expected to continue through the weekend. Additional weakening is forecast through Friday, and Linda is expected to weaken to a tropical storm later today as it crosses 140W, and become a gale- force post- tropical cyclone by Saturday. Please read the latest NHC Public Advisory at https://www.nhc.noaa.gov/text/MIATCPEP2.shtml and Forecast/ Advisory at https://www.nhc.noaa.gov/text/MIATCMEP2.shtml for more details. ...TROPICAL WAVES... A tropical wave extends its axis along 92W and north of 04N, moving W around 10 kt. No significant convection is noted near this tropical wave. A tropical wave extends its axis along 107W and north of 03N, moving W at 5-10 kt. Numerous moderate and isolated strong convection is noted from 14N-16N between 102W-105W. A tropical wave extends its axis along 120W north of 03N, moving W around 10 kt. No significant convection is observed near this tropical wave. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 10N84WW to a 1010 mb low pressure at 16N102W to 12N120W to 14N125W to 10N140W. Aside from the convection described in the Tropical Wave sections, scattered moderate convection is noted within 60 nm south of the monsoon trough west of 130W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A surface trough is analyzed off Baja California Norte, supporting SW to S fresh to strong winds in the northernmost Gulf of California. Elsewhere, surface ridging extending from a 1035 mb high near 45N142W south- southeastward to near Clarion Island is providing quiescent conditions across the Mexican offshore zones. Seas are generally 6-8 ft in the offshore due primarily to SW swell, 3-5 ft in the northernmost Gulf of California, with slight seas over the Gulf of California. A few thunderstorms are noted off Chiapas, and also off Michoacan near the 1010 mb low pressure at 16N102W. For the forecast, the surface trough just west of Baja California will move northeastward, supporting SW to W fresh to strong gap winds over northernmost Gulf of California through this morning. SW swell of 8 ft in the waters off S Mexico will gradually subside through Sun. Hurricane Grace, located over the Caribbean Sea, is forecast to move inland over mainland Mexico early Sat morning and dissipate over Mexico on Sun. However, the remnants are expected to continue westward into the E Pacific Ocean, and an area of low pressure could form by early next week off the coast of southwest Mexico. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR... Tranquil winds will persist over the Central American and Equatorial Offshore zones through at least Mon night. SW swell of up to 8 ft will affect the same waters through today, before gradually subsiding into Sun. REMAINDER OF THE AREA... Please read the Special Features section for details on Hurricane Linda. Elsewhere, surface ridging extending from a 1035 mb high near 45N142W south-southeastward to Clarion Island is promoting generally moderate or weaker winds north of the monsoon trough. SW winds equatorward of the monsoon trough are moderate to fresh. Seas are 8-9 ft from 08N-12N between 95W-115W, mainly due to SW swell. For the forecast away from Linda, no significant changes to the winds over the open Pacific are expected for the next several days. Northerly swell will boost seas 8-10 ft north of 27N between 120W-135W through Sun night. The SW swell south of 13N will gradually diminish through Sun night. Hurricane Grace, located over the Caribbean Sea, is forecast to move inland over mainland Mexico early Sat morning and dissipate over Mexico on Sun. However, the remnants are expected to continue westward into the E Pacific Ocean, and an area of low pressure could form by early next week off the coast of SW Mexico. $$ Christensen