089 AXPZ20 KNHC 291554 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1507 UTC Wed Aug 29 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 1200 UTC surface analysis and satellite imagery through 1500 UTC. ...SPECIAL FEATURES... Tropical Storm Miriam centered near 14.2N 139.4W at 29/1500 UTC or 960 nm ESE of Hilo Hawaii moving W at 10 kt. Estimated minimum central pressure is 996 mb. Maximum sustained wind speed is 60 kt with gusts to 75 kt. Numerous moderate to strong convection is within 180 nm of the center. Scattered moderate convection is elsewhere within 300 nm of the center. Some further strengthening is possible during the next 24 to 48 hours. Miriam is forecast to move into the Central Pacific basin by tonight then turn northward. See latest NHC forecast/advisory under AWIPS/WMO headers MIATCMEP5/WTPZ25 KNHC for more details. Tropical Storm Norman centered near 17.8N 115.7W at 29/1500 UTC or 450 nm SW of The Southern Tip Of Baja California moving WNW at 9 kt. Estimated minimum central pressure is 994 mb. Maximum sustained wind speed is 55 kt with gusts to 65 kt. Numerous moderate and scattered strong convection is within 150 nm of the center. Scattered moderate convection is elsewhere within 210 nm of the center. Norman is forecast to strengthen to a hurricane by tonight. See latest NHC forecast/advisory under AWIPS/WMO headers MIATCMEP1/WTPZ21 KNHC for more details. ...TROPICAL WAVES... A tropical wave has an axis that extends from 05N86W to 22N86W, moving westward at 10 to 15 kt. This wave was reanalyzed farther east over the past 24 hours, and is producing little to no convection at this time. A tropical wave has an axis that extends from 05N104W to 18N103W, moving westward at around 10 kt. Scattered moderate and isolated strong convection are from 11N to 15N between 100W and 105W. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough axis extends from 09N75W to 10N90W to 14N107W, then resumes west of Tropical Storm Norman near 14N118W to 12N130W. Aside from convection associated with the tropical waves, scattered moderate convection is from 07N to 16N between 91W and 98W, and within 60 nm of the monsoon trough axis between 119W and 123W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A ridge extends over the discussion waters from 30N125W to near 21N112W. 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 on Sat as the pressure gradient weakens. Elsewhere, gentle to moderate winds will prevail offshore 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. The exception to this will be brief periods in the Gulf of Papagayo where nocturnal offshore gap winds will pulse to moderate to fresh. Seas of 4 to 6 feet can be expected during this time period, except increasing to 7 ft under the nocturnal Papagayo winds. REMAINDER OF THE AREA... Please see the Special Features section for information on Tropical Storm Miriam and Tropical Storm Norman. 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 and west of 120W through the remainder of the week, with seas generally ranging between 5 to 7 ft. South of the monsoon trough region, expect generally moderate to occasionally fresh winds with seas of 6 to 7 ft. $$ Latto