000 AXPZ20 KNHC 210902 TWDEP TROPICAL WEATHER DISCUSSION NWS NATIONAL HURRICANE CENTER MIAMI FL 1005 UTC WED MAY 21 2014 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. ...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... MONSOON TROUGH EXTENDS FROM 10N83W TO 12N94W TO 1011 MB LOW PRESSURE 09N105W TO 09N110W TO 1011 MB LOW PRESSURE AT 13N117W. ITCZ EXTENDS FROM 09N119W TO 07N132W TO 06N140W. SCATTERED MODERATE ISOLATED STRONG CONVECTION IS FROM 02N TO 10N E OF 82W...AND FROM 07N TO 14N BETWEEN 98W AND 106W. SCATTERED MODERATE CONVECTION IS FROM 06N TO 08N BETWEEN 117W AND 121W. THE LOW PRESSURE AT 09N105W IS EXPECTED TO DRIFT W-NW THROUGH THE WEEKEND WITH GUIDANCE SUGGESTING DEEPENING OF THE LOW NEAR 12N112W EARLY NEXT WEEK. THE LOW PRESSURE NEAR 13N117W IS EXPECTED TO REMAIN QUASI-STATIONARY AND GRADUALLY LOSE IDENTITY IN THE MONSOON TROUGH. ...DISCUSSION... IN THE UPPER LEVELS... A BROAD UPPER LEVEL TROUGH WITH STRONG SUBSIDENCE IS OVER THE NW CORNER N OF 20N W OF 110W TO INCLUDE BAJA CALIFORNIA. A BROAD UPPER LEVEL RIDGE IS S OF 20N W OF 110W. A LARGE UPPER LEVEL HIGH IS CENTERED NEAR 14N97W WITH SIGNIFICANT UPPER LEVEL MOISTURE. ANOTHER SMALL UPPER LEVEL HIGH IS CENTERED NEAR 06N80W AND IS ENHANCING THE CONVECTION ALONG THE EASTERN SEGMENT OF THE MONSOON TROUGH. ON THE SURFACE... A 1029 MB HIGH IS CENTERED NEAR 36N136W. A RIDGE AXIS EXTENDS SW TO 25N120W. ANTICYCLONIC SURFACE WINDS ARE GENERALLY AT 15-20 KT AROUND THE PERIPHERY OF THIS RIDGE...EXCEPT NORTHWESTERLY 20-25 KT WINDS ARE N OF 28N E OF 117W TO THE BAJA PENINSULA FOR THE NEXT SIX HOURS OR SO. GULF OF TEHUANTEPEC...THE NOCTURNAL NORTHERLY DRAINAGE FLOW HAS 20 TO 25 KT TONIGHT AND WILL WEAKEN TO A 15 KT BY THIS EVENING. $$ FORMOSA