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Eastern North Pacific Tropical Weather Discussion



000
AXPZ20 KNHC 260948
TWDEP 

Tropical Weather Discussion
NWS National Hurricane Center Miami FL
1005 UTC Wed Jul 26 2017

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 
0900 UTC.

...SPECIAL FEATURES... 

Hurricane Hilary is centered near 16.3N 111.0W at 0900 UTC, 
moving WNW at 10 kt. Estimated minimum central pressure is 973 
mb. Maximum sustained windS are 90 kt with gusts to 110 kt. 
Numerous moderate to strong convection is within 105 nm of the 
center, with scattered moderate isolated strong convection 
elsewhere within 150 nm. See latest NHC forecast/ advisory under 
AWIPS/WMO headers MIATCMEP4/WTPZ24 for more details.

Hurricane Irwin is centered near 15.7N 121.5W at 0900 UTC moving 
WSW at 6 kt. Estimated minimum central pressure is 987 mb. 
Maximum sustained winds are 70 kt with gusts to 85 kt. Numerous 
moderate isolated strong convection is displaced within 120 nm 
NW of the center. Irwin is expected to interact with hurricane 
Hilary during the next 3 days. See latest NHC forecast/advisory 
under AWIPS/WMO headers MIATCMEP5/WTPZ25 for more details.

Tropical Depression Greg is centered near 17.8N 139.5W at 0900 
UTC moving NW at 11 kt. Estimated minimum central pressure is 
1006 mb. Maximum sustained winds are 30 kt with gusts to 40 kt. 
Greg is forecast to move west of the forecast area and weaken 
into a remnant low by tonight. Convective activity continues to 
decrease with scattered moderate convection noted within 60 nm 
NW of the center. See latest NHC forecast/advisory under 
AWIPS/WMO headers MIATCMEP2/WTPZ22 for more details.

...TROPICAL WAVES... 

A tropical wave is along 101W N of 05N moving W at 10-15 kt.
Convection is limited near the wave axis. 

...INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH... 

The monsoon trough extends from 08N78W across western Panama and 
southern Costa Rica to 09N88W to 12N105W. A small area of active 
convection is within 60 nm of 13N91W. 

...DISCUSSION...

OFFSHORE WATERS WITHIN 250 NM OF MEXICO...

Gentle to moderate NW winds are expected to continue within 120 
nm of the Baja California peninsula through Friday. Seas will 
gradually increase as southerly swell associated with Hurricane 
Hilary will begin impacting the forecast zones offshore of Baja 
California through Friday. Gentle southerly flow will prevail in 
the Gulf of California, and moderate southerly flow across the 
northern Gulf of California.

Nocturnal fresh northerly winds are forecast across the Gulf of 
Tehuantepec through Friday morning. Hilary is expected to pass S 
of the Revillagigedo Islands today. 8 ft seas associated with 
Hilary are forecast to reach the outer waters of marine zone 
PMZ015 through Thursday.

OFFSHORE WATERS WITHIN 250 NM OF CENTRAL AMERICA, COLOMBIA, AND 
WITHIN 750 NM OF ECUADOR... 

Across the Gulf of Papagayo, expect fresh winds each night with 
the assistance of the nocturnal drainage flow the next few days, 
occasionally building max seas to 7 ft in a mix of E wind waves 
and long period SW swell.

Gentle to moderate S to SW winds are expected the next few days. 
Long period cross-equatorial SW swell will continue to propagate 
into the forecast waters through Saturday, reaching the waters 
between Ecuador and the Galapagos Islands on Thursday.   

REMAINDER OF THE AREA... 

High pressure is located N of the area with a ridge axis that 
extends across the forecast waters north of 20N. The pressure 
gradient between this system and the active zone of tropical 
cyclone activity will maintain moderate to fresh fresh N to NE 
winds W of 120W through Thursday. Cross equatorial 8-9 ft SW 
swell will spread across the waters south of 10N and east of 
110W, persisting into the weekend. 

$$
Mundell