728 AXPZ20 KNHC 012239 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1912 UTC Sat Sep 1 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 2115 UTC. ...SPECIAL FEATURES... Hurricane Norman is centered near 16.3N 125.1W at 01/2100 UTC moving W or 275 degrees at 12 kt. Estimated minimum central pressure is 970 mb. Maximum sustained wind speed is 90 kt with gusts to 110 kt. Little change in strength is expected through tonight. Gradual weakening is forecast to begin on Sunday and continue through early next week. Numerous moderate and scattered strong convection is seen within 60 nm of the center. Scattered moderate and isolated strong convection is noted elsewhere within 180 nm of the center. See latest NHC forecast/advisory under AWIPS/WMO headers MIATCMEP1/WTPZ21 KNHC for more details. Tropical Depression Seventeen-E is located near 14.9N 111.1W at 01/2100 UTC moving WNW or 285 degrees at 10 kt. Estimated minimum central pressure is 1006 mb. Maximum sustained wind speed is 30 kt with gusts to 40 kt. Slow strengthening is forecast over the next few days, and the depression is expected to become a tropical storm tonight or Sunday. Numerous moderate and scattered strong convection is found in the W semicircle within 150 nm. Scattered moderate and isolated strong convection is observed elsewhere from 11N to 18N between 106W and 117W. Scattered moderate and isolated strong convection is also found from 17N to 24N between 105W and 109W. See latest NHC forecast/ advisory under AWIPS/WMO headers MIATCMEP2/WTPZ22 KNHC for more details. ...TROPICAL WAVES... A tropical wave has an axis from 07N78W to 20N77W. The wave is moving west around 10 kt. Scattered moderate and isolated strong convection is taking place N of 03N and E of 83W. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough axis extends from 08N75W to 10N97W to 13N105W then resumes from 12N128W to 10N133W to 12N139W. Scattered moderate and isolated strong convection is noted from 07N to 14N between 87W and 104W and within 90 nm either side of a line from 11N125W to 09N132W to 09N137W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A surface trough is forecast to remain over the the Gulf of California and the Baja California Peninsula through at least Tue as Seventeen-E passes S of a weakness in the subtropical ridge. Based on this weather pattern, the tropical cyclone would pass close to the offshore forecast waters through Tue evening. Swell generated by this system will spread across the offshore forecast waters through Wed night. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... The monsoon trough will linger near 10N during the next few days. Winds on both sides of the trough axis will be gentle to moderate, and seas of 4 to 6 feet are expected through Monday night. REMAINDER OF THE AREA... See the Special Features section for details on Hurricane Norman and Tropical Depression 17E. Tropical Storm Miriam is centered W of area near 23.3N 141.5W at 01/2100Z but it is still producing winds in the 20 to 25 kt range and seas of 10 to 12 ft for the forecast waters from 21N to 23N W of 139W. Swell from Miriam are maintaining seas elsewhere N of 18N and W of 136W. This area of winds and seas will move W of the discussion area by Mon morning as Miriam moves farther into the central Pacific. Otherwise, a ridge dominates the forecast waters N of 20N W of 120W. Swell generated by the above mentioned tropical cyclones will produce a large area of seas of 8 ft or greater for most of the waters N of 10N and W of 110W through late Mon. $$ CAM