000 AXPZ20 KNHC 222207 TWDEP Tropical Weather Discussion NWS National Hurricane Center Miami FL 2205 UTC Mon Aug 22 2016 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 2145 UTC. ...SPECIAL FEATURES... Tropical Storm Kay is centered near 22.0N 118.0W at 22/2100 UTC or about 452 nm west of the southern tip of Baja California moving west or 275 degrees at 7 knots. The estimated minimum central pressure has risen to 1004 mb, with maximum sustained wind speeds 35 knots with gusts to 45 knots. Latest satellite imagery shows that the overall cloud pattern and convective structure of Kay has become weaker. Cold cloud tops have warmed during the day. Only scattered moderate convection is within 120 nm of the center in the southwest and within 60 nm of the center in the northwest quadrant of Kay. Kay is forecast to forecast to weaken to a tropical depression by 18Z on Tuesday per the latest NHC advisory, then weaken further to a post-tropical remnant low by late Tuesday night, and dissipate on Thursday. Please read the latest NHC forecast/advisory under AWIPS/WMO headers MIATCMEP2/ WTPZ22 KNHC for more details, and the latest public advisory MIATCPEP2/WTPZ32 KNHC, for more details. ...TROPICAL WAVES... Tropical wave axis is along 97W from 08N to 15N moving westward at 10 to 15 kt. Low pressure of 1009 mb is along the wave near 11N. Scattered moderate to isolated strong convection is within 180 nm west of the wave from 09N to 14N. Scattered moderate convection is within 180 nm east of the wave from 12.5N to 14N. Tropical wave axis is along 117W from 06N to 14N moving westward at about 15 kt. Scattered moderate to isolated strong convection is confined to the southern portion of the wave in the monsoon trough region within 60 nm west of the wave from 06N to 10N. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... The monsoon trough axis extends from 10N85W to 10N91W to 10N100W to 11N101W to low pressure near 10N112W to 08.5N123W to 10N132W. The ITCZ extends from 10N132W to beyond 08N140W. Scattered of the axis between 114W and 117W. Scattered moderate convection is within 60 nm north of the axis between 102W and 104W, and within 120 nm south of the axis between 118W and 121W. ...DISCUSSION... OFFSHORE WATERS WITHIN 250 NM OF MEXICO... Tropical Storm Kay has shifted west of the forecast area. Light to moderate winds prevail over much of the area in a relatively weak pressure pattern, which will persist into early next week. Combined seas of 4 to 6 feet will subside gradually during the next few days. The Gulf of Tehuantepec: The tight gradient behind the tropical wave along 97W in combination with nocturnal drainage flow into the Gulf will bring north to northeast winds of 20 to 25 knots into the Gulf with seas building to 8 ft. These winds will briefly diminish to 15 to 20 kt on Tuesday afternoon. then start up again late Tuesday night into Wednesday with seas to near 9 ft. OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND WITHIN 750 NM OF ECUADOR... Winds will pulse into the Gulf of Papagayo during the next few nights...peaking near 25 kt during the late night and early morning hours and weakening to 20 kt during the late afternoon and early evening hours. Elsewhere, Light to moderate winds will prevail on either side of the monsoon trough with seas in the 4 to 6 foot range. ELSEWHERE... High pressure of 1018 mb is centered near 29N127W. The resulting weak pressure gradient is maintaining generally light to gentle winds with sea heights in the range of 4 to 6 feet. These general conditions will prevail today before freshening Tuesday. Afterwards, moderate to fresh winds will prevail through the remainder of the week. $$ Aguirre