000 AXPZ20 KNHC 230935 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 935 UTC Tue Jul 23 2019 Tropical Weather Discussion for the eastern Pacific Ocean from the Equator to 32N, east of 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 FEATURE... Tropical Storm Dalila is centered near 18.0N 117.3W at 23/0900 UTC, moving NNW at 6 kt. The estimated minimum central pressure is 1005 mb. Maximum sustained wind speed is 35 kt with gusts to 45 kt. Dalila will continue to move through much of today, then weaken to below tropical storm strength late today as it starts turning more NW. The remnant low of Dalila will continue to weaken through late week as it moves slowly westward, dissipating by Sat. Dalila is experiencing some northerly shear, and numerous moderate to strong convection is displaced to within 120 nm in the southwest quadrant of the partially exposed low level center. Please see the latest NHC forecast/advisory under AWIPS/WMO headers MIATCMEP5/WTPZ25 KNHC for more details. ...TROPICAL WAVES... A tropical wave with axis along 90W extends southward from Central America into the far eastern Pacific, moving west at about 10-15 kt. Scattered moderate convection is noted from 11N-13N between 93W-95W. A tropical wave with axis near 102W is moving west at about 10 kt. Scattered moderate and isolated strong convection is observed on the northern end of the tropical wave, along the coast of Mexico between 95W and 103W. A tropical wave with axis along 129W is moving west at about 10 kt. No significant convection is noted near this tropical wave. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 08N79W to 10N107W. Another segment of the monsoon trough extends from 13N120W to 11N129W. The intertropical convergence zone reaches from 09N132W to 06N137W to beyond 06N140W. Scattered moderate convection is noted off Colombia from 05N to 07N east of 79W. Scattered moderate convection is noted north of the monsoon trough from 09N to 11N between 88W and 90W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Fresh to strong southerly winds will seas to 9 ft will impact the waters around Clarion Island this morning as Tropical Storm Dalila makes its closet point of approach around 120 nm to the west of the island. The strong winds and high seas associated with Dalila are expected to stay west of the offshore waters of Baja California, beyond 270 nm, as the storm moves farther to the NW and weakens later today. The track of Dalila will weaken the subtropical ridge, allowing gentle to moderate breezes and slight seas across the remainder of the open waters off Baja California, and over the Gulf of California. No significant gap wind events or long-period swell are anticipated to affect the Mexican offshore zones through mid week. The next round of fresh to strong northerly gap winds into the Gulf of Tehuantepec is not expected until early Fri, following the passage of a tropical wave. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Fresh overnight gap winds through the Gulf of Papagayo will diminish later this morning. No significant gap winds are expected through mid week, until late Thu when high pressure north of the area in the wake of a passing tropical wave will enhance overnight drainage winds to produce fresh to strong gap winds. Moderate S to SW winds south of the monsoon trough will build seas to 8 ft or greater off the coast of Panama and Colombia before diminishing late Tue. Wave model guidance indicates seas may approach 8 ft over the equatorial waters Thu and Fri as long- period southerly swell moves into the region. REMAINDER OF THE AREA... Recent scatterometer and altimeter satellite passes confirm fresh trade winds persisting from 15N to 25N west of 135W with seas 6 to 8 ft, between 1027 mb high pressure northwest of the region, and the tropical wave near 130W. Farther east, an area of 8 ft seas, mainly with a component of SW swell, persists northeast of the Galapagos Islands from 04N to 08N between 95W and 100W. These seas will subside through late today. Moderate to fresh S to SW winds equatorward of the monsoon trough will maintain seas of 5 to 7 ft through mid week. $$ Christensen