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TROPICAL STORM SANDRA INTERMEDIATE ADVISORY NUMBER  17A
NWS NATIONAL HURRICANE CENTER MIAMI FL       EP222015
500 PM MST FRI NOV 27 2015

...SANDRA WEAKENS TO A TROPICAL STORM...
...CENTER MOVING MORE NORTHWARD DURING THE PAST SEVERAL HOURS...


SUMMARY OF 500 PM MST...0000 UTC...INFORMATION
----------------------------------------------
LOCATION...20.8N 108.6W
ABOUT 150 MI...240 KM WSW OF LAS ISLAS MARIAS MEXICO
ABOUT 215 MI...345 KM SW OF MAZATLAN MEXICO
MAXIMUM SUSTAINED WINDS...70 MPH...115 KM/H
PRESENT MOVEMENT...N OR 10 DEGREES AT 10 MPH...17 KM/H
MINIMUM CENTRAL PRESSURE...984 MB...29.06 INCHES


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

None.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Tropical Storm Warning is in effect for...
* Altata to San Blas
* Las Islas Marias

A Tropical Storm Warning means that tropical storm conditions are
expected somewhere within the warning area, in this case within the
next 12 to 24 hours.

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


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 500 PM MST (0000 UTC), the center of Hurricane Sandra was located
near latitude 20.8 North, longitude 108.6 West. Sandra has moved
northward near 10 mph (17 km/h) for the past several hours.  A
general motion toward the north-northeast is expected later tonight
and Saturday. On the forecast track, the center of Sandra is
expected to pass west of Las Islas Marias tonight and move onshore
in the warning area on Saturday.

Maximum sustained winds have decreased to near 70 mph (115 km/h)
with higher gusts. Additional rapid weakening is forecast, and
Sandra is expected to be near tropical storm strength when it moves
near the coast of Mexico in the warning area on Saturday. After the
center moves inland, Sandra should quickly dissipate.

Tropical storm force winds extend outward up to 150 miles (240 km)
mainly to the east of the center.

The estimated minimum central pressure is 984 mb (29.06 inches).


HAZARDS AFFECTING LAND
----------------------
RAINFALL:  Sandra is expected to produce total rainfall
accumulations of 4 to 6 inches with isolated maximum amounts of
10 inches possible across the Mexican states of Nayarit, southern
Sinaloa, northwest Jalisco, Aguascal, southern Zacateca and southern
Durango. This rainfall may produce life-threatening flash flood and
mudslides.

WIND:  Tropical storm conditions are expected to reach Las Islas
Marias in the next few hours and reach the coast of mainland Mexico
within the warning area tonight.


NEXT ADVISORY
-------------
Next complete advisory at 800 PM MST.

$$
Forecaster Beven

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