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BULLETIN
Tropical Storm Norma Advisory Number   4
NWS National Hurricane Center Miami FL       EP172017
300 AM MDT Fri Sep 15 2017

...NORMA FORECAST TO BECOME A HURRICANE WHILE MOVING SLOWLY TOWARD
BAJA CALIFORNIA SUR...


SUMMARY OF 300 AM MDT...0900 UTC...INFORMATION
----------------------------------------------
LOCATION...18.6N 109.7W
ABOUT 85 MI...140 KM E OF SOCORRO ISLAND
ABOUT 295 MI...480 KM S OF CABO SAN LUCAS MEXICO
MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H
PRESENT MOVEMENT...N OR 350 DEGREES AT 2 MPH...4 KM/H
MINIMUM CENTRAL PRESSURE...1000 MB...29.53 INCHES


WATCHES AND WARNINGS
--------------------

There are no coastal watches or warnings in effect.

Interests in Baja California Sur should monitor the progress of
Norma. A Hurricane Watch could be required later today for portions
of the peninsula.


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 300 AM MDT (0900 UTC), the center of Tropical Storm Norma was
located near latitude 18.6 North, longitude 109.7 West. Norma is
moving toward the north near 2 mph (4 km/h), and this slow motion is
expected to continue for the next couple of days.

Maximum sustained winds are near 50 mph (85 km/h) with higher gusts.
Some strengthening is forecast during the next 48 hours and Norma
is expected to become a hurricane on Saturday.

Tropical-storm-force winds extend outward up to 70 miles (110 km)
from the center.

The estimated minimum central pressure is 1000 mb (29.53 inches).


HAZARDS AFFECTING LAND
----------------------
SURF:  Swells generated by Norma will begin affecting portions
of the coast of southwestern Mexico and Baja California Sur this
weekend.  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 900 AM MDT.

$$
Forecaster Avila

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