815 AXPZ20 KNHC 302111 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2105 UTC Thu Aug 30 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 1800 UTC surface analysis and satellite imagery through 2030 UTC. ...SPECIAL FEATURES... Hurricane Norman centered near 17.5N 118.8W at 30/2100 UTC or 600 nm WSW of The Southern Tip Of Baja California moving W at 7 kt. Estimated minimum central pressure is 937 mb. Maximum sustained wind speed is 130 kt with gusts to 160 kt. Numerous moderate to strong convection is within 120 nm of the center. Scattered moderate convection is elsewhere within 150 nm N semicircle and 270 nm S semicircle. See latest NHC forecast/advisory under AWIPS/WMO headers MIATCMEP1/WTPZ21 KNHC for more details. Hurricane Miriam centered west of the area near 15.7N 141.6W at 2100 UTC. Estimated minimum central pressure is 982 mb. Maximum sustained wind speed is 75 kt with gusts to 90 kt. Scattered moderate convection is over the discussion waters from 12N to 20N W of 138W. See latest CPHC forecast/advisory under AWIPS/WMO headers TCMCP3/WTPA23 PHFO for more details. A tropical wave along 109W is producing scattered moderate isolated strong convection from 10N to 20N between 106W and 110W. This system has a medium chance to develop into a tropical cyclone over the next 48 hours as it continues to move westward. For additional information, please refer to the Eastern Pacific Tropical Weather Outlook under AWIPS/WMO headers TWOEP/ABPZ20 KNHC. ...TROPICAL WAVES... A tropical wave has an axis that extends from 05N95W to 19N95W, moving westward at around 10 kt. Scattered moderate convection is from 08N to 13N between 92W and 97W. A tropical wave has an axis that extends from 05N109W to 17N109W, moving westward at 10 to 15 kt. See the special features section for more details. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough axis extends from 09N79W to 09N90W to 12N100W to 13N112W, then resumes west of Hurricane Norman near 15N123W to 14N137W. Aside from convection associated with the tropical waves, scattered moderate isolated strong convection is from 05N to 11N between 80W and 91W, from 07N to 15N between 97W and 104W, and from 08N to 12N between 132W and 138W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A ridge extends over the discussion waters from 30N130W to near 22N113W. The pressure gradient between the high and a trough across the Baja California Peninsula will support moderate to occasionally fresh NW winds along the coast of Baja California Norte through Fri, with seas generally between 4 to 6 ft. Winds will diminish Sat as the pressure gradient weakens. Elsewhere, gentle to moderate winds will prevail in offshore waters of Mexico the next several days with seas of 3 to 6 ft. Low pressure over northern Mexico will support light to gentle southerly flow over the Gulf of California the remainder of the week. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... The monsoon trough will linger along 09N/10N during the next few days. Winds on both sides of the trough axis will generally be light to moderate. Seas of 4 to 6 feet can be expected. REMAINDER OF THE AREA... Please see the Special Features section for information on Hurricane Miriam, Hurricane Norman, and a tropical wave along 109W. Elsewhere, the pressure gradient between ridging across the waters N of 20N and the monsoon trough will support moderate to locally fresh trades and 4 to 7 ft seas in mixed swell N of the monsoon trough west of 120W through the remainder of the week, with seas generally between 5 and 7 ft. South of the monsoon trough, expect gentle to moderate winds with seas of 5 to 7 ft. By Sun morning northerly swell to 8 ft may propagate as far S as 29W between 119W and 124W. This swell should diminish below 8 ft by Sun afternoon. $$ Latto