BULLETIN

TSUNAMI MESSAGE NUMBER  10

NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI

420 AM HST FRI MAR 11 2011

TO – CIVIL DEFENSE IN THE STATE OF HAWAII

SUBJECT – TSUNAMI WARNING SUPPLEMENT

A TSUNAMI WARNING CONTINUES IN EFFECT FOR THE STATE OF HAWAII.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

   ORIGIN TIME – 0746 PM HST 10 MAR 2011

   COORDINATES – 38.3 NORTH  142.4 EAST

   LOCATION    – NEAR EAST COAST OF HONSHU  JAPAN

   MAGNITUDE   – 8.9  MOMENT

MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY

 GAUGE LOCATION        LAT   LON    TIME        AMPL         PER

 ——————-  —– ——  —–  —————  —-

 KAHULUI MAUI         20.9N 156.5W  1340Z   1.82M /  6.0FT  28MIN

 LAHAINA HI           20.9N 156.7W  1335Z   0.50M /  1.6FT  64MIN

 MILOLII HI           19.2N 155.9W  1350Z   0.67M /  2.2FT  12MIN

 KAPOHO HI            19.5N 154.8W  1340Z   0.04M /  0.1FT  52MIN

 BARBERS PT HI        21.3N 158.1W  1323Z   0.65M /  2.1FT  06MIN

 HONUAPO HI           19.1N 155.6W  1340Z   0.04M /  0.1FT  32MIN

 HALEIWA HI           21.6N 158.1W  1329Z   1.09M /  3.6FT  38MIN

 MAKAPU`U HI          21.3N 157.7W  1312Z   0.49M /  1.6FT  52MIN

 KAWAIHAE HAWAII      20.0N 155.8W  1330Z   0.85M /  2.8FT  56MIN

 HONOKOHAU HI         19.7N 156.0W  1345Z   0.44M /  1.4FT  10MIN

 NAWILIWILI KAUAI     22.0N 159.4W  1311Z   0.64M /  2.1FT  26MIN

 HANALEI HI           22.2N 159.5W  1306Z   0.85M /  2.8FT  28MIN

 TERN FR. FRIGATE US  23.9N 166.3W  1224Z   0.37M /  1.2FT  16MIN

 NOTE – THE KAHULUI MEASUREMENT IS CLIPPED.  ACTUAL IS LARGER.

 LAT  – LATITUDE (N-NORTH, S-SOUTH)

 LON  – LONGITUDE (E-EAST, W-WEST)

 TIME – TIME OF THE MEASUREMENT (Z IS UTC IS GREENWICH TIME)

 AMPL – TSUNAMI AMPLITUDE MEASURED RELATIVE TO NORMAL SEA LEVEL.

        IT IS …NOT… CREST-TO-TROUGH WAVE HEIGHT.

        VALUES ARE GIVEN IN BOTH METERS(M) AND FEET(FT).

 PER  – PERIOD OF TIME IN MINUTES(MIN) FROM ONE WAVE TO THE NEXT.

 NOTE – DART MEASUREMENTS ARE FROM THE DEEP OCEAN AND THEY

 ARE GENERALLY MUCH SMALLER THAN COASTAL MEASUREMENTS.

EVALUATION

 A TSUNAMI HAS BEEN GENERATED THAT COULD CAUSE DAMAGE ALONG

 COASTLINES OF ALL ISLANDS IN THE STATE OF HAWAII. URGENT ACTION

 SHOULD BE TAKEN TO PROTECT LIVES AND PROPERTY.

 A TSUNAMI IS A SERIES OF LONG OCEAN WAVES. EACH INDIVIDUAL WAVE

 CREST CAN LAST 5 TO 15 MINUTES OR MORE AND EXTENSIVELY FLOOD

 COASTAL AREAS. THE DANGER CAN CONTINUE FOR MANY HOURS AFTER THE

 INITIAL WAVE AS SUBSEQUENT WAVES ARRIVE. TSUNAMI WAVE HEIGHTS

 CANNOT BE PREDICTED AND THE FIRST WAVE MAY NOT BE THE LARGEST.

 TSUNAMI WAVES EFFICIENTLY WRAP AROUND ISLANDS. ALL SHORES ARE AT

 RISK NO MATTER WHICH DIRECTION THEY FACE. THE TROUGH OF A TSUNAMI

 WAVE MAY TEMPORARILY EXPOSE THE SEAFLOOR BUT THE AREA WILL

 QUICKLY FLOOD AGAIN. EXTREMELY STRONG AND UNUSUAL NEARSHORE

 CURRENTS CAN ACCOMPANY A TSUNAMI. DEBRIS PICKED UP AND CARRIED

 BY A TSUNAMI AMPLIFIES ITS DESTRUCTIVE POWER. SIMULTANEOUS HIGH

 TIDES OR HIGH SURF CAN SIGNIFICANTLY INCREASE THE TSUNAMI HAZARD.

MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS WARRANT.

…SP…