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HURRICANE OTTO INTERMEDIATE ADVISORY NUMBER  15A
NWS NATIONAL HURRICANE CENTER MIAMI FL       AL162016
100 PM EST THU NOV 24 2016

...EYE OF DANGEROUS HURRICANE OTTO MADE LANDFALL ON THE SOUTHERN
NICARAGUAN COAST NEAR THE TOWN OF SAN JUAN DE NICARAGUA...


SUMMARY OF 100 PM EST...1800 UTC...INFORMATION
----------------------------------------------
LOCATION...11.0N 83.9W
ABOUT 90 MI...140 KM NW OF LIMON COSTA RICA
ABOUT 70 MI...110 KM S OF BLUEFIELDS NICARAGUA
MAXIMUM SUSTAINED WINDS...110 MPH...175 KM/H
PRESENT MOVEMENT...W OR 270 DEGREES AT 9 MPH...15 KM/H
MINIMUM CENTRAL PRESSURE...975 MB...28.80 INCHES


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

None.

SUMMARY OF WATCHES AND WARNINGS IN EFFECT:

A Hurricane Warning is in effect for...
* Limon Costa Rica to Bluefields Nicaragua

A Hurricane Watch is in effect for...
* North of Bluefields to Sandy Bay Sirpi Nicaragua
* South of Limon to the Costa Rica/Panama border

A Tropical Storm Warning is in effect for...
* North of Bluefields to Sandy Bay Sirpi Nicaragua
* Puntarenas Costa Rica to Puerto Sandino Nicaragua

Interests elsewhere in Nicaragua and Costa Rica should monitor the
progress of Otto.

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


DISCUSSION AND 48-HOUR OUTLOOK
------------------------------
At 100 PM EST (1800 UTC), Hurricane Otto made landfall on the coast
of southern Nicaragua near latitude 11.0 North, longitude 83.9 West,
just to the north of the town of San Juan de Nicaragua. Otto is the
southernmost landfalling hurricane in Central America on record.
The hurricane is moving toward the west near 9 mph (15 km/h), but a
faster motion toward the west or west-southwest is forecast to begin
tonight and continue through early Saturday. On this track, the
center of Otto will continue to move across southern Nicaragua and
northern Costa Rica through this evening, and then is expected to
reach the Pacific coast of southern Nicaragua or northern Costa Rica
tonight or early Friday.

Otto made landfall with maximum sustained winds of 110 mph (175
km/h) with higher gusts. Weakening should begin soon while the
hurricane moves farther inland, and Otto is forecast to become a
tropical storm by tonight. Additional weakening is anticipated
thereafter.

Hurricane-force winds extend outward up to 15 miles (30 km) from
the center and tropical-storm-force winds extend outward up to 70
miles (110 km).

The estimated minimum central pressure is 975 mb (28.80 inches).


HAZARDS AFFECTING LAND
----------------------
RAINFALL:  Total rainfall of 6 to 12 inches, with isolated amounts
of 15 to 20 inches, can be expected across northern Costa Rica and
southern Nicaragua through today. These rains will likely result in
life-threatening flash floods and mudslides.

Outer rain bands from Otto are expected to produce rainfall
accumulations of 3 to 6 inches with total rainfall amounts of up to
10 inches over the higher terrain of far western Panama and
southern Costa Rica through Friday.

Additional rainfall amounts of 1 to 3 inches can be expected today
over San Andres and Providencia Islands.

WIND:  Hurricane and tropical storm conditions are occurring in the
warning area. Hurricane conditions are possible in the hurricane
watch area later today.

Tropical storm conditions are expected in the warning area along the
Pacific coasts of Costa Rica and Nicaragua by this evening.

STORM SURGE:  The combination of a dangerous storm surge and large
and destructive waves could raise water levels by as much 4 to 6
feet above normal tide levels in areas of onshore flow within the
hurricane warning area.

SURF:  Swells generated by Otto are likely to cause life-threatening
surf and rip current conditions over the next several days along the
coasts of Panama, Costa Rica, and Nicaragua.  Please consult
products from your local weather office.


NEXT ADVISORY
-------------
Next complete advisory at 400 PM EST.

$$
Forecaster Avila

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