Tropical Weather Discussion

axpz20 knhc 310910

Tropical weather discussion                                      
NWS National Hurricane Center Miami FL                         
1005 UTC Mon Aug 31 2015

Tropical weather discussion for the eastern Pacific Ocean from  
the Equator to 32n...east of 140w. The following information is 
based on satellite observations...radar...and 
meteorological analysis.

Based on 0600 UTC surface analysis and satellite imagery through 
0900 UTC.               

...Special features...

Category four Hurricane Jimena centered near 15.3n 133.9w at 
0300 UTC...moving WNW 285 deg at 15 kt. Maximum sustained winds 
are 130 kt with gusts to 160 kt. Estimated minimum pressure is 
936 mb. Satellite imagery shows that Jimena has a well defined 
eye surrounded by intense deep convection. Numerous moderate to 
strong convection is within 120 nm N and 90 nm S of the eye. 
Scattered moderate isolated strong convection elsewhere outside 
the central dense overcast in convective bands within 270 nm NE 
and 180 nm SW of the center. It is forecast to move W-NW S of 
the subtropical ridge while in forecast waters through 48 hours. 
Jimena has a large area of strong winds and high seas within 390 
nm N and 270 nm S of the center...with Max seas to 48 ft. It is 
expected to move W of 140w Tue night. Refer to the latest NHC 
forecast/advisory under AWIPS/WMO headers miatcmep3/wtpz23 knhc 
and High Seas Forecast under AWIPS/WMO headers miahsfepi/fzpn02 
kwbc for additional details. 

A 1008 mb low pres system embedded in the monsoon trough near 
10n109w is showing signs of development as it drifts westward. 
Scattered moderate isolated strong convection is within 60 nm of 
the low center. Enhanced SW monsoonal flow to 25 kt within the 
se semicircle of the low is supporting seas to 8 ft. The low is 
expected to intensify and move N-NW through Tue. Environmental 
conditions are favorable for tropical cyclone formation during 
the next 24-48 hours as Jimena moves farther away from it.

...Intertropical convergence zone/monsoon trough...            

A monsoon trough extends from 11n85w to 12n89w to 10n95w to 
12n103w to low pres near 10n109w to 10n123w. Scattered moderate 
isolated strong convection from 05n to 13n between 94w and 96w. 
Scattered moderate isolated strong convection from 07n to 09n 
between 112w and 121w.


A surface ridge extends across northern waters from 32n136w to 
17n104w. The gradient is supporting 15-20 kt trades S of the 
ridge to 15n with combined seas of 6-7 ft in mixed NW and cross 
equatorial S swell. Little change is expected through Tue but 
the area of higher seas generated by Jimena will shift westward 
as it crossed 140w and moves W of the discussion area Wed. The 
gradient E of the ridge is supporting NW 15-20 kt winds E of 
122w to the Baja California peninsula with combined seas of 6-8 
ft in NE waters between 118w-122w. The gradient will relax late 
tonight with seas subsiding to 4-7 ft by Tue evening. SW swell 
is expected to reach the Equator between 105w-120w in about 36 
hours on Tue then spread northward into southern waters.



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