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BULLETIN
Tropical Storm John Advisory Number   4
NWS National Hurricane Center Miami FL       EP122018
900 AM MDT Mon Aug 06 2018

...JOHN CONTINUES TO RAPIDLY INTENSIFY...


SUMMARY OF 900 AM MDT...1500 UTC...INFORMATION
----------------------------------------------
LOCATION...15.5N 107.9W
ABOUT 340 MI...545 KM SW OF MANZANILLO MEXICO
ABOUT 525 MI...850 KM SSE OF THE SOUTHERN TIP OF BAJA CALIFORNIA
MAXIMUM SUSTAINED WINDS...70 MPH...110 KM/H
PRESENT MOVEMENT...WNW OR 300 DEGREES AT 8 MPH...13 KM/H
MINIMUM CENTRAL PRESSURE...993 MB...29.33 INCHES


WATCHES AND WARNINGS
--------------------
There are no coastal watches or warnings in effect.


DISCUSSION AND OUTLOOK
----------------------
At 900 AM MDT (1500 UTC), the center of Tropical Storm John was
located near latitude 15.5 North, longitude 107.9 West.  John is
moving toward the west-northwest near 8 mph (13 km/h), and a faster
northwestward motion is forecast for the next few days.

Maximum sustained winds are near 70 mph (110 km/h) with higher
gusts.  Rapid strengthening is predicted during the next day or so,
and John is expected to become a hurricane later today, and reach
major hurricane strength on Tuesday.

Tropical-storm-force winds extend outward up to 80 miles (130 km)
from the center.

The estimated minimum central pressure is 993 mb (29.33 inches).


HAZARDS AFFECTING LAND
----------------------
SURF:  Swells generated by John are expected to begin affecting the
coasts of southwestern Mexico and the southern portion of the Baja
California peninsula during the next day or so.  These swells are
likely to cause life-threatening surf and rip current conditions.
Please consult products from your local weather office.


NEXT ADVISORY
-------------
Next complete advisory at 300 PM MDT.

$$
Forecaster Brown

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