000 AXPZ20 KNHC 231536 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1512 UTC Sun Aug 23 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 1200 UTC surface analysis and satellite imagery through 1500 UTC. ...SPECIAL FEATURES... An elongated area of low pressure located several hundred miles south-southwest of the southern tip of the Baja California peninsula continues to produce a large area of disorganized cloudiness and thunderstorms. Conditions appear favorable for development, and a tropical depression is likely to form by the middle of this week while the system meanders or drifts northward a few hundred miles offshore the coast of southwestern Mexico. The latest Tropical Weather Outlook states that this system has a medium change of tropical cyclone formation through 48 hours, and a high chance for tropical cyclone formation through the next 5 days. An area of low pressure appears to be forming a couple of hundred miles south-southwest of the Gulf of Tehuantepec. Conditions appear conducive for additional development of this system, and a tropical depression is likely to form by the middle of the week while it moves slowly northwestward, near or parallel to the southwestern coast of Mexico. Regardless of development, areas of heavy rainfall and flash flooding are likely in southeastern Mexico and northern Central America during the next several days. The latest Tropical Weather Outlook gives this system a medium change of tropical cyclone formation through 48 hours, and a high chance for tropical cyclone formation through the next 5 days. Please refer to the latest NHC Tropical Weather Outlook at www.hurricanes.gov for more details on both systems. ...TROPICAL WAVES... A tropical wave axis is near 93W N of 03N. Scattered moderate to isolated strong convection is from 11N to 14N between 90W and 94W. This tropical wave has already spawned Tropical Storm Marco. It also has the potential to help the development of a tropical cyclone south of the Gulf of Tehuantepec early this week. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends across northern Central America from 14N90W to 1008 mb low pressure near 13N96W to 15N118W to 13N140W. Scattered moderate isolated strong convection is noted from 10N to 17N between 94W and 120W. Scattered moderate convection is seen from 11N to 13N between 120W and 131W, and from 10N to 14N W of 136W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... The remnants of T.S. Genevieve, analyzed as 1008 mb low pressure near 29N122W will dissipate by tonight. High pres will build in the wake of the low. Farther south, monsoon flow has strengthened south of southern Mexico. As previously mentioned, there will be the potential for two tropical systems to develop over the offshore waters of Mexico this week. Please, see the Special Features section for details. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, and WITHIN 750 NM OF ECUADOR... SW monsoon flow will continue to strengthen the remainder of the weekend. This enhanced monsoon flow will bring the potential for heavy rainfall over portions of Central America through early next week. This heavy rain could lead to flash flooding, especially in areas of mountainous terrain. REMAINDER OF THE AREA... A ridge dominates the northern forecast waters N of 20N and W of 125W. A low pressure system moving northward just W of the area is producing an area of fresh to locally strong SW winds from 10N to 15N W of 136W. Seas are in the 8 to 9 ft range. The low pressure will remain near 140W through early this week before moving westward. Moderate to fresh SW winds prevail S of the monsoon trough across most of the forecast region. Fresh to locally strong SW winds are noted between 90W and 120W. $$ GR