000 AXPZ20 KNHC 182120 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2205 UTC Wed Aug 18 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 1800 UTC surface analysis and satellite imagery through 2100 UTC. ...SPECIAL FEATURES... Hurricane Linda is centered near 18.7N 133.2W at 18/2100 UTC moving WNW at 12 kt. Estimated minimum central pressure is 977 mb. Maximum sustained wind speed is 85 kt with gusts to 105 kt. Peak seas are currently near 30 ft and are expected to diminish slightly by Thu afternoon to 25 ft, as the system crosses 140W. Numerous moderate and scattered strong convection is present within 120 NM east and 90 NM west of the center of Linda. The same motion is expected to continue through the weekend. Steady weakening is forecast through Friday, and Linda is expected to become a gale-force post-tropical cyclone on 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 91W and north of 04N, moving W around 10 kt. Scattered moderate to isolated strong convection is occurring from 08N-11N between 90W-95W. A tropical wave extends its axis along 104W and north of 03N, moving W at 5-10 kt. Scattered moderate and isolated strong convection is noted north of 11N between 101W-104W. A tropical wave extends its axis along 118W north of 03N, moving W around 10 kt. Scattered moderate convection is noted from 04N-06N between 116W-120W. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 08N78W to a 1010 mb low pressure at 14N100W to 10N140W. Aside from the convection described in the Tropical Wave sections, scattered moderate and isolated strong convection is noted from 08N-11N west of 132W. Scattered moderate convection is also observed from 10N-13W between 119W- 124W, from 10N-14N between 105W-111W, and from 04N-07N between 83W-88W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A surface trough extends from 30N119W to 24N123W, supporting SW to S fresh to strong winds in the northernmost Gulf of California. Elsewhere, surface ridging extending from a 1034 mb high near 45N141W south-southeastward to 28N123W is providing quiescent conditions across the Mexican Offshore zones. Seas are generally 6-8 ft in the offshore due primarily to SW swell, 3-6 ft in the northernmost Gulf of California, and 1-2 ft elsewhere in the Gulf. 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 tomorrow 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 SW 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 Thu, 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 1034 mb high near 45N141W south-southeastward to 28N123W 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 8N-13N between 95W-112W, 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. A N swell will boost seas 8-10 ft north of 27N between 120W-135W from tonight 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. $$ Landsea