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BULLETIN
Tropical Storm Norma Advisory Number   5
NWS National Hurricane Center Miami FL       EP172017
900 AM MDT Fri Sep 15 2017

...NORMA STRENGTHENING AND FORECAST TO BECOME A HURRICANE BY
TONIGHT...


SUMMARY OF 900 AM MDT...1500 UTC...INFORMATION
----------------------------------------------
LOCATION...18.7N 109.7W
ABOUT 85 MI...135 KM E OF SOCORRO ISLAND
ABOUT 290 MI...465 KM S OF CABO SAN LUCAS MEXICO
MAXIMUM SUSTAINED WINDS...65 MPH...100 KM/H
PRESENT MOVEMENT...NNW OR 340 DEGREES AT 2 MPH...4 KM/H
MINIMUM CENTRAL PRESSURE...996 MB...29.42 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 or Tropical Storm Watch could be required later
today for portions of the peninsula.


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 900 AM MDT (1500 UTC), the center of Tropical Storm Norma was
located near latitude 18.7 North, longitude 109.7 West.  Norma is
moving toward the north-northwest near 2 mph (4 km/h), and this
slow motion is expected to continue through early Saturday.  A
faster northward motion should begin by early Sunday.

Maximum sustained winds have increased to near 65 mph (100 km/h)
with higher gusts.  Additional strengthening is forecast during the
next 48 hours, and Norma is expected to become a hurricane by
tonight.

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

The estimated minimum central pressure is 996 mb (29.42 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 300 PM MDT.

$$
Forecaster Berg

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