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BULLETIN
Tropical Storm Norma Advisory Number  12
NWS National Hurricane Center Miami FL       EP172017
300 AM MDT Sun Sep 17 2017

...NORMA WEAKENS SOME MORE...


SUMMARY OF 300 AM MDT...0900 UTC...INFORMATION
----------------------------------------------
LOCATION...20.5N 110.4W
ABOUT 125 MI...200 KM NNE OF SOCORRO ISLAND
ABOUT 170 MI...270 KM S OF CABO SAN LUCAS MEXICO
MAXIMUM SUSTAINED WINDS...50 MPH...85 KM/H
PRESENT MOVEMENT...NNW OR 345 DEGREES AT 5 MPH...7 KM/H
MINIMUM CENTRAL PRESSURE...999 MB...29.50 INCHES


WATCHES AND WARNINGS
--------------------
CHANGES WITH THIS ADVISORY:

None.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Tropical Storm Warning is in effect for...
* Los Barriles to Todos Santos

A Tropical Storm Watch is in effect for...
* North of Todos Santos to Cabo San Lazaro

A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case within 24
hours.

A Tropical Storm Watch means that tropical storm conditions are
possible within the watch area, in this case within 36 hours.

For storm information specific to your area, please monitor
products issued by your national meteorological service.


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 300 AM MDT (0900 UTC), the center of Tropical Storm Norma was
located near latitude 20.5 North, longitude 110.4 West.  Norma is
moving toward the north-northwest near 5 mph (7 km/h).  A turn
toward the northwest is expected on Monday.  On the forecast track,
the center of Norma will move just west of the Baja California
peninsula today and Monday.

Maximum sustained winds have decreased to near 50 mph (85 km/h) with
higher gusts.  Additional weakening is expected through Monday.

Tropical-storm-force winds extend outward up to 90 miles (150 km)
from the center.

The estimated minimum central pressure is 999 mb (29.50 inches).


HAZARDS AFFECTING LAND
----------------------
RAINFALL:  Norma is expected to produce total rainfall accumulations
of 2 to 4 inches over the southern portion of the Mexican state of
Baja California Sur, with isolated maximum amounts up to 8 inches.
These rainfall amounts may produce life-threatening flash floods.

WIND:  Tropical storm conditions are expected to first reach the
coast within the warning area by this afternoon.  Tropical storm
conditions are possible within the watch area tonight or early
Monday.

SURF:  Swells generated by Norma are affecting portions of the coast
of southwestern Mexico and Baja California Sur and will continue
into early next week.  These swells are likely to cause life-
threatening surf and rip current conditions.  Please consult
products from your local weather office.


NEXT ADVISORY
-------------
Next intermediate advisory at 600 AM MDT.
Next complete advisory at 900 AM MDT.

$$
Forecaster Zelinsky

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