000 AXPZ20 KNHC 270351 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 247 UTC Sun May 27 2018 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 0000 UTC surface analysis and satellite imagery through 0245 UTC. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from 14N91W to 10N100W to 09N113W to 07N123W to 09N133W. The ITCZ extends from 08N137W to beyond 07N140W. Scattered moderate and isolated strong convection is noted from 06N to 11N between 84W and 95W, from 05N to 10N between 101W and 112W and from 06N to 08N between 114W and 125W. A 1010 mb surface low centered near 09N136W separates the monsoon trough from the ITCZ. a surface trough extends NE from the low to 14N131W. Scattered moderate and isolated strong convection is present from 10N to 14N between 129W and 132W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A ridge extends SE into the region from a 1030 mb high centered near 35N139W to the Revillagigedo Islands. Fresh to locally strong NW to N winds across the offshore waters of Baja California will continue through Sun, then become fresh Sun night through Tue. Seas of 6 to 9 ft will prevail across this area through the weekend then diminish gradually Mon and Tue. Gulf of California: Gentle to moderate NW winds will prevail across the Gulf waters through Sunday, with strong afternoon through evening sea breezes recurring along the Mexican coastline from Mazatlan to Guaymas through Mon. A low pressure trough developing over the Baja Peninsula will cause winds over the Gulf to light to gentle by Wed. Gulf of Tehuantepec: Winds are expected to be variable during the next few days, with moderate NW to N winds at night and light SW to S winds during the late mornings and afternoons. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... The monsoon trough is displaced well N of its climatological position in response to broad low pressure that has formed over the Yucatan peninsula and Central America. The trough now extends WSW from the Guatemala coastal waters. This pressure pattern will persist across the regional Pacific waters through at least Tue and support light to moderate SW to W winds and 4 to 6 ft seas for the waters west of Central America. REMAINDER OF THE AREA... NW swell associated with a dissipated frontal boundary have subsided enough to allow seas N of 25N and west of 138W to subside below 8 ft. Elsewhere, the ridge building over the north central Pacific is producing a modest pressure gradient across the trade wind belt, with moderate to fresh winds observed in satellite-derived wind data from 10N to 25N to the west of 120W. A 1010 mb low pressure center is drifting WSW across far SW portions near 09N136W. A broad area of fresh to strong NE winds and seas 8 to 9 ft is evident near the low from 11N to 19N between 128W and 138W. The low will weaken to a trough on Sun as it translates westward. Meanwhile the expansive high centered over the central Pacific will slowly strengthen and shift E over the NE Pacific as it maintains fresh trade winds and seas from 7 to 9 ft across the trade wind belt through Tue night. Deepening low pressure over the Desert SW will combined with building high pressure W of california to tighten the pressure gradient along the California coast. Long period N swell generated by these winds will cause seas N of 25N between 120W and 135W to build to between 8 and 10 ft by Wed morning. $$ CAM