000 AXPZ20 KNHC 150854 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Thu Oct 15 2020 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 0730 UTC. ...SPECIAL FEATURES... Post-Tropical Cyclone Norbert is centered near 26.2N 116.1W at 15/0900 UTC moving NNW at 6 kt. Estimated minimum central pressure is 1010 mb. Maximum sustained wind speed is 25 kt with gusts to 35 kt. While Norbert has become post-tropical there are still some remnant winds of fresh to strong along with seas of 8 to 9 ft near the center as confirmed by recent altimeter data. These winds and seas will diminish and subside today as the remnant low continues to spin down. Please read the final NHC Public Advisory at: https://www.nhc.noaa.gov/text/MIATCPEP4.shtml and Forecast/ Advisory at: https://www.nhc.noaa.gov/text/MIATCMEP4.shtml for more details. Gulf of Tehuantepec Gale Warning: Fresh to strong N to NE gap winds are blowing in the Tehuantepec region per recent scatterometer data. These winds will briefly diminish this afternoon, then return early Fri morning. The current 8 ft peak seas will subside some through this afternoon. Winds will increase to gale force Fri night through Sat night, then will be fresh to strong thereafter. Seas should peak with this gale event near 13 ft late Fri night and Sat morning and remain at least 8 ft through at least Mon night. ...TROPICAL WAVES... A tropical wave axis is near 91W/92W from 01N northward to near Guatemala, moving W at 10 to 15 kt. No significant convection directly associated with the wave is present. A tropical wave axis is near 113W/114W from 01N to 17N, moving W at 10 to 15 kt. No significant convection is present near the wave. A tropical wave axis is near 127W/128W from 01N to 20N, moving W at 10 to 15 kt. Convection associated with this wave has diminished during the past several hours. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough axis extends from northern Colombia near 10N75W to 10N100W to 12N115W to 10N130W. The ITCZ axis extends from 10N130W to 10N140W. Scattered moderate convection is noted from 05N to 08N between 85W and 89W, and from 09N to 11N between 119W and 124W. Scattered moderate to strong convection that developed over Central America during the afternoon and evening hours on Wed continues to propagate offshore N of 11N and E of 94W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Please see the Special Features section for more details on Post-Tropical Norbert and on the developing Gale Warning in the Gulf of Tehuantepec. Moderate to fresh NW winds have developed offshore of SW Mexico up through the S Gulf of California as indicated by overnight scatterometer data with the strongest winds near Cabo Corrientes. These winds will spread northwest to the central Gulf of California and offshore of Baja California Sur Thu, then to off Baja California Norte Fri and Fri night while diminishing elsewhere. Seas should remain just below 8 ft with these winds. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR... Winds will be light to gentle north of the monsoon trough laying along 09N/10N, except for moderate to fresh NE to E winds in the Papagayo region Fri night and Sat night. Gentle to moderate S to SW winds are expected south of the monsoon trough for the next few days becoming fresh on Sun night. Mainly moderate 5 to 7 ft long-period S swell will prevail across the waters through the weekend. Seas will build in southerly swell Mon and Mon night. Scattered showers and thunderstorms will be common in the Central American zones due to the proximity of the monsoon trough for at least the next couple of days as is described above. REMAINDER OF THE AREA... A moderate pressure gradient due to high pressure well N of the discussion waters and low pressure from the ITCZ is producing generally moderate to fresh E trades. Troughing to develop west of Baja California should weaken these trades slightly Fri through Sun, with the winds returning by the end of the weekend into early next week. A set of northerly swell continues to reach the area N of 21N and W of 133W, with seas ranging between 6 and 8 ft. This swell will continue to propagate across the northern waters through today. A reinforcing set of northerly swell will move across the northern waters tonight into the weekend. Moderate to locally fresh monsoonal flow is noted across the remainder of the area S of the monsoon trough, with moderate to locally fresh trades N of the monsoon trough and W of 120W. Seas of 5 to 8 ft in mixed swell dominates the remainder of the waters. $$ Lewitsky