000 AXPZ20 KNHC 270837 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1005 UTC Sat Jun 27 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 0815 UTC. ...SPECIAL FEATURES... Tropical Depression Boris has moved W of 140W into the Central Pacific basin and is centered near 12.4N 140.5W at 27/0900 UTC moving W at 6 kt. Estimated minimum central pressure is 1007 mb. Maximum sustained wind speed is 30 kt with gusts to 40 kt. Scattered moderate and isolated strong convection is noted within 180 nm in the NE quadrant of Boris. While Boris has moved W of the area, associated winds and seas are still E of 140W. These conditions will diminish E of 140W by 48 hours. Please read the latest CPHC Public Advisory at: https://www.nhc.noaa.gov/text/HFOTCPCP1.shtml and Forecast/ Advisory at https://www.nhc.noaa.gov/text/HFOTCMCP1.shtml for more details. ...TROPICAL WAVES... A tropical wave is crossing Central America with axis N of 01N along 87W/88W, moving westward at 15 to 20 kt. Scattered moderate and isolated strong convection is noted from 02N to 08N between 83W and 91W. A tropical wave is crossing SW Mexico just to the E of Cabo Corrientes with axis N of 01N along 104W, moving westward at 15 to 20 kt. Associated convection is described below. A tropical wave is just SW of Cabo San Lucas along 111W, moving westward around 15 kt. Associated convection is described below. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough axis extends from 08N75W to 10N90W to 13N100W to 11N114W to low pressure near 13N123.5W to 09N130W to 11N137W. Scattered moderate and isolated strong convection is noted N of 05N and E of 80W including the Gulf of Panama, within 15N100W to 05N94W to 09N115W to 13N110W to 15N100W, and from 06N to 10N between 118W and 120W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... A broad 1008 mb low pressure area is near 15.5N109W. This low is expected to move west-northwestward away from the coast of Mexico during the next couple of days while another low forms along a tropical wave to the E-SE. A swath of fresh to strong E-SE winds and seas of 8-11 ft will parallel the coast through early Mon. Aside from the winds and seas, scattered to numerous heavy showers and tstms are expected in this region. Elsewhere, mainly gentle to moderate NW-N winds prevail offshore of Baja California. Moderate to fresh southerly winds in the Gulf of California will pulse to fresh to strong in the northern Gulf later this morning through early next week. Otherwise, little change is anticipated for the next several days. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Fresh to locally strong winds will pulse over and downstream of the Papagayo region through the middle of next week. Wave heights will peak around 8 ft. Moderate to occasionally fresh monsoon flow will prevail over the waters S of 10N through this weekend. Looking ahead, building seas are possible W of 85W Mon through Tue night as monsoonal flow freshens across the region and SW swell propagates through the waters. Conditions will improve thereafter. REMAINDER OF THE AREA... Please see the Special Features section above for more details on Tropical Depression Boris which has now moved W of 140W. Moderate to fresh monsoonal flow persists south of the monsoon trough between 97W and 125W. Fresh winds and SW swell are likely producing 7-8 ft combined seas in this region. Mainly moderate N-NE flow continues between Boris and a high pressure ridge that extends across the northern waters, with seas generally 5-7 ft. A weak low-level circulation is near 13N123.5W, but associated wind speeds are 20 kt or less. A set of northerly swell will spread south of 30N by early Sun through early next week building seas to 7-9 ft N of 27N. Cross-equatorial southerly swell, combined with freshening monsoon flow, will build seas S of the monsoon trough and E of 120W this weekend. Seas are building to 8-9 ft S of the Equator through Sun in the S-SW swell, then will subside on Mon. Looking ahead, another SW swell event is possible over the far southern waters Tue through Wed night. $$ Lewitsky