000 AXPZ20 KNHC 011502 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 1341 UTC Mon Jun 1 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... ...Heavy rainfall across Central America and Southern Mexico... A Central American Gyre is centered over northern Central America and southern Mexico, with the broad cyclonic circulation around the gyre encompassing the discussion waters N of the equator and E of 100W, and extending across adjacent portions of the southern Gulf of Mexico and the western Caribbean Sea. Moderate to strong winds are noted across much of these eastern Pacific waters, with seas in the 6-9 ft range. Numerous moderate and scattered strong convection is noted across much of these waters N of 10N E of 100W. Elsewhere areas of thunderstorms continue to impact portions of Central America from Costa Rica northwestward to the Bay of Campeche. The low level circulation of Tropical Storm Amanda dissipated over Guatemala on Sunday, but not before producing torrential rainfall over portions of Guatemala and El Salvador. The remnants of Amanda are rotating cyclonically within the larger circulation of the Central American Gyre. This moved the focus of torrential rainfall to portions of Belize and the Yucatan peninsula during the past 12 hours. The remnants of Amanda will continue to rotate within the circulation of the Central American Gyre, and are expected to emerge over water in the SW Gulf today. Once moving back over water, there is a favorable environment for the development of a new tropical depression in the SW Gulf. Please refer to the NHC Atlantic basin Tropical Weather Outlook for more information on the potential for tropical cyclogenesis in the SW Gulf. Winds around the Central American Gyre will continue to advect abundant moisture into portions of Central America and southeastern Mexico for the next several days. This will maintain a dangerous situation for these areas. Heavy rainfall has already impacted portions of Guatemala, Belize, El Salvador, western Honduras, western Nicaragua, and portions of southern Mexico E of Veracruz and eastern Oaxaca. Persistent active and wet weather, with periods of heavy rainfall, is expected over these areas the next several days. The continued heavy rainfall will exacerbate the current situation, with the potential for life-threatening flash floods and mudslides for locations that receive the heaviest rainfall, especially in areas of mountainous terrain. Please refer to products issued by your local weather service for more details. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough extends from the low pressure near 18N90W to 09N106W to low pressure near 08N120W to low pressure near 09N132W to 08N140W. Scattered moderate to strong convection is noted from 00N 10N E of 87W. Numerous moderate scattered strong convection was noted N of 10N E of 100W. Scattered moderate isolated strong convection is noted from 07N to 10N between 100W and 121W. Scattered moderate isolated strong convection is noted from 05N to 11N between 130W and 135W. OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Please see the Special Features section for more details on the Central American Gyre. The circulation around the Central American Gyre is funneling northerly winds through the Chivela pass across the Gulf of Tehuantepec. This is producing NW gap winds of 20-25 kt across the Gulf of Tehuantepec that are feeding into a large cluster of strong thunderstorms offshore. Elsewhere, moderate to fresh NW to W winds prevail across the open waters off Mexico. Seas are in the 5-7 ft range over the open waters off Mexico, and in the 1-3 ft range over the interior Gulf of California. The Central American Gyre over the northern portion of Central America and southern Mexico is producing active weather over the southern Mexico offshore waters, which will continue through the upcoming week. Elsewhere, high pressure will build modestly over the northern waters by mid-week and then further Thu and Fri. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Please see the Special Features section for more details on the Central American Gyre. Outside of winds and seas associated to the Central American Gyre, gentle to moderate winds prevail. Seas are in the 5-8 ft range across the area. The Central American Gyre is centered over the northern portion of Central America and southern Mexico. This feature is bringing active weather over the offshore waters of Central America, currently N of 08N, which will continue through the upcoming week. Elsewhere, long-period SW swell will continue propagating across the region through early this week. REMAINDER OF THE AREA... Low pressure is centered just N of the area near 30.5N135W, with a weak ridge over the waters N of 20N. The weak pressure gradient between the area of high pressure and low pressure within the monsoon trough is supporting moderate winds N of the monsoon trough to near 20N and W of 125W. Light to gentle winds prevail elsewhere N of the monsoon trough. Moderate to fresh southerly winds prevail S of the monsoon trough between 103W and 121W, where seas are 7-8 ft. Light to gentle southerly winds prevail elsewhere W of 121W. Seas over the discussion area are in the 5-7 ft range. The surface low will drift into the far NW portion of the discussion waters today. The low will weaken by Tuesday and dissipate by Wed. High pres will then build it its wake. $$ AL