Tropical Weather Discussion

axpz20 knhc 232157

Tropical weather discussion 
NWS National Hurricane Center Miami FL
2205 UTC Mon Apr 23 2018 

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.

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

A surface trough extends southwest from the Pacific coast of 
Panama at 08n79w to 06n97w where scatterometer winds indicate 
that an ITCZ develops and continues west-northwest to 08n120w, 
then turns southwest to 05n129w, then turns west-northwest to 
beyond 06n140w. Scattered moderate and isolated strong 
convection is noted within 150 nm of 06n83w, within 240 nm 
either side of a line from 08n91w to 11n117w to 07n125w, and 
within 150 nm either side of a line from 06n129w to 08n140w.  


Offshore waters within 250 nm of Mexico...

A northwest to Southeast Ridge will meander from 23n116w to 
12n94w for the next several days with gentle to moderate 
northwest winds, and 4 to 7 ft seas, forecast across the open 
waters west of the Baja Peninsula. The pressure gradient is 
forecast to tighten on Wed resulting in moderate to fresh 
northwest flow within about 60 nm of the West Coast of the 
central Baja Peninsula on Thu, and fresh to locally strong flow 
expected on Fri. 

Gulf of california:  light to gentle variable winds are forecast 
this week.

Gulf of tehuantepec: fresh to locally strong nocturnal flow 
will continue this week.  

Offshore waters within 250 nm of Central America, Colombia, and 
within 750 nm of Ecuador... 

Gulf of papagayo: fresh to locally strong northeast nocturnal 
winds expected tonight and on Tue night, with seas building to 
as high as 7 ft downstream near 11n88w. Moderate to locally 
fresh nocturnal drainage flow expected to resume on Wed night.

Gulf of panama: gentle nocturnal flow forecast this week.

Elsewhere, gentle to moderate offshore flow will prevail 
generally N of 09n, while light to gentle SW winds are forecast 
S of 09n. 

Remainder of the area... 

A 1023 mb surface high is centered at 33n135w with a ridge 
extending southeast to near 12n94w. Northerly swell in the form 
of 7 to 9 ft seas currently observed across the waters from 30n 
to 32n between 120w and 132w, will subside to less than 8 ft 
overnight. Fresh northeast trades, and 6 to 8 ft seas, are 
observed across the tropical waters south of the ridge and north 
of the the ITCZ, with little change forecast through the 
remainder of this week.

The surface high will move north overnight allowing a weak cold 
front to move into the far northwest waters on Tue and quickly 
wash out. A round of northwest swell, in the form of 7 to 9 ft 
seas, will accompany the front and then gradually subside 
through Wed. 

Southerly swell, in the form of 7 to 9 ft seas, currently 
observed between the Equator and 03.4s will gradually subside
through Thu.



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