Alert archive / Hawaii / Tsunami Watches in 2021
Tsunami Watch 1, NWS HEB
NWS HEB issued this tsunami watch at Feb 10, 2021, 3:31 AM HST for 4 counties in Hawaii. It was in force for 169 days.
The area
The counties it named.
The facts
- Issued
- Feb 10, 2021, 3:31 AM HST (13:31 UTC)
- Expired
- Jul 28, 2021, 9:54 PM HST
- In force
- 169 days
- Issued by
- NWS HEB
Counties Hawaii County, HI, Honolulu County, HI, Kalawao County, HI, Kauai County, HI
The radar
The Molokai radar (PHMO), 38 km from the middle of the area, began a volume at 13:31 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Lihue, (PHLI), launched 12:00Z, 1.5 hours before the alert went out and 214 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 11 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 1360 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- -12 m²/s²
- 0-3 km storm-relative helicity
- 24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
927
WEZS40 PHEB 101331
TSUPPG
ASZ001>003-101531-
/O.NEW.PHEB.TS.A.0001.210210T1331Z-000000T0000Z/
BULLETIN
TSUNAMI MESSAGE NUMBER 1
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
231 AM SST WED FEB 10 2021
...A TSUNAMI WATCH IS NOW IN EFFECT FOR AMERICAN SAMOA...
AUDIENCE
--------
EMERGENCY MANAGERS... MEDIA... GENERAL PUBLIC
EVALUATION
----------
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 7.9 OCCURRED
SOUTHEAST OF THE LOYALTY ISLANDS AT 220 AM SST ON WEDNESDAY
FEBRUARY 10 2021.
* THE TSUNAMI THREAT TO AMERICAN SAMOA FROM THIS EARTHQUAKE IS
STILL BEING EVALUATED.
* IF A TSUNAMI THREAT EXISTS... THE EARLIEST ESTIMATED ARRIVAL
TIME OF TSUNAMI WAVES WITHIN AMERICAN SAMOA WOULD BE
541 AM SST ON WEDNESDAY FEBRUARY 10 2021
RECOMMENDED ACTIONS
-------------------
* STAY ALERT FOR FURTHER INFORMATION. THE TSUNAMI WATCH COULD
BE ELEVATED TO AN ADVISORY OR WARNING.
* CONSIDER YOUR COURSE OF ACTION IF A TSUNAMI ADVISORY OR
WARNING IS ISSUED.
ESTIMATED TIMES OF ARRIVAL
--------------------------
* ESTIMATED TIMES OF ARRIVAL -ETA- OF THE INITIAL TSUNAMI WAVE
ARE GIVEN BELOW. ACTUAL ARRIVAL TIMES MAY DIFFER AND THE
INITIAL WAVE MAY NOT BE THE LARGEST. A TSUNAMI IS A SERIES
OF WAVES AND THE TIME BETWEEN WAVES CAN BE FIVE MINUTES TO
ONE HOUR.
LOCATION REGION COORDINATES ETA(SST)
----------------------------------------------------------
TAFUNA TUTUILA 14.3S 170.7W 541 AM 02/10
LEONE TUTUILA 14.3S 170.8W 541 AM 02/10
FAGAMALO TUTUILA 14.3S 170.8W 541 AM 02/10
FAGASA TUTUILA 14.3S 170.7W 541 AM 02/10
AMANAVE TUTUILA 14.3S 170.8W 541 AM 02/10
PAGO PAGO TUTUILA 14.3S 170.7W 545 AM 02/10
VATIA TUTUILA 14.2S 170.7W 545 AM 02/10
MASEFAU TUTUILA 14.3S 170.6W 545 AM 02/10
PAGAI TUTUILA 14.3S 170.6W 545 AM 02/10
AUMI TUTUILA 14.3S 170.7W 545 AM 02/10
TULA TUTUILA 14.3S 170.6W 545 AM 02/10
AUNUU ISLAND AUNUU 14.3S 170.6W 545 AM 02/10
TAU ISLAND MANUA 14.3S 169.5W 548 AM 02/10
OFU ISLAND MANUA 14.2S 169.7W 549 AM 02/10
OLESEGA ISLAND MANUA 14.2S 169.6W 549 AM 02/10
SWAINS ISLAND SWAINS 11.1S 171.1W 558 AM 02/10
POTENTIAL IMPACTS
-----------------
* POTENTIAL TSUNAMI IMPACTS ARE STILL BEING EVALUATED.
* IF THERE IS A TSUNAMI THREAT TO AMERICAN SAMOA... THE
EARLIEST IMPACTS WOULD BE AROUND 541 AM SST ON WEDNESDAY
FEBRUARY 10 2021.
PRELIMINARY EARTHQUAKE PARAMETERS
---------------------------------
* MAGNITUDE 7.9
* ORIGIN TIME 220 AM SST FEB 10 2021
* COORDINATES 23.1 SOUTH 171.5 EAST
* DEPTH 20 MILES
* LOCATION SOUTHEAST OF LOYALTY ISLANDS
NEXT UPDATE AND ADDITIONAL INFORMATION
--------------------------------------
* THE NEXT MESSAGE WILL BE ISSUED IN ONE HOUR... OR SOONER IF
THE SITUATION WARRANTS.
* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND ON THE
INTERNET AT WWW.TSUNAMI.GOV.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.
$$8 follow-up statements
983
WEZS40 PHEB 101434
TSUPPG
ASZ001>003-101634-
/O.CAN.PHEB.TS.A.0001.000000T0000Z-000000T0000Z/
BULLETIN
TSUNAMI MESSAGE NUMBER 2
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
334 AM SST WED FEB 10 2021
...THE TSUNAMI WATCH IS NOW CANCELED FOR AMERICAN SAMOA...
IN THIS MESSAGE ARE REVISED ALERTS... AND EARTHQUAKE PARAMETERS.
AUDIENCE
--------
EMERGENCY MANAGERS... MEDIA... GENERAL PUBLIC
EVALUATION
----------
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 7.7 OCCURRED
SOUTHEAST OF THE LOYALTY ISLANDS AT 220 AM SST ON WEDNESDAY
FEBRUARY 10 2021.
* ALL AVAILABLE DATA INDICATE THERE IS NO TSUNAMI THREAT TO
AMERICAN SAMOA FROM THIS EARTHQUAKE ALTHOUGH MINOR SEA LEVEL
FLUCTUATIONS MAY OCCUR.
RECOMMENDED ACTIONS
-------------------
* BE OBSERVANT AND EXERCISE NORMAL CAUTION IF YOU ARE NEAR OR
IN THE OCEAN. OTHERWISE... NO ACTION IS REQUIRED.
TSUNAMI OBSERVATIONS
--------------------
* THE FOLLOWING ARE TSUNAMI WAVE OBSERVATIONS FROM COASTAL
AND/OR DEEP-OCEAN SEA LEVEL GAUGES AT THE INDICATED
LOCATIONS. THE MAXIMUM TSUNAMI HEIGHT IS MEASURED WITH
RESPECT TO THE TIDE LEVEL.
GAUGE TIME OF MAXIMUM WAVE
COORDINATES MEASURE TSUNAMI PERIOD
GAUGE LOCATION LAT LON (SST) HEIGHT (MIN)
-------------------------------------------------------------
MARE NEW CALEDONIA 21.5S 167.9E 308 AM 0.2FT/ 0.0M 10
LENAKEL VU 19.5S 169.3E 317 AM 0.4FT/ 0.1M 06
POTENTIAL IMPACTS
-----------------
* MINOR SEA LEVEL FLUCTUATIONS MAY OCCUR IN SOME AREAS
BEGINNING AROUND 541 AM SST ON WEDNESDAY FEBRUARY 10 2021...
AND CONTINUING FOR UP TO SEVERAL HOURS.
PRELIMINARY EARTHQUAKE PARAMETERS - UPDATED
-------------------------------------------
* MAGNITUDE 7.7
* ORIGIN TIME 220 AM SST FEB 10 2021
* COORDINATES 23.1 SOUTH 171.5 EAST
* DEPTH 20 MILES
* LOCATION SOUTHEAST OF LOYALTY ISLANDS
NEXT UPDATE AND ADDITIONAL INFORMATION
--------------------------------------
* THIS WILL BE THE FINAL STATEMENT ISSUED FOR THIS EVENT UNLESS
NEW INFORMATION IS RECEIVED OR THE SITUATION CHANGES.
* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND ON THE
INTERNET AT WWW.TSUNAMI.GOV.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.
$$639
WEHW40 PHEB 041938
TSUHWX
HIZ001>003-005>009-012>014-016>021-023>026-042138-
/O.NEW.PHEB.TS.A.0001.210304T1938Z-000000T0000Z/
BULLETIN
TSUNAMI MESSAGE NUMBER 1
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
938 AM HST THU MAR 04 2021
TO - EMERGENCY MANAGEMENT IN THE STATE OF HAWAII
SUBJECT - TSUNAMI WATCH
A TSUNAMI WATCH IS ISSUED FOR THE STATE OF HAWAII EFFECTIVE AT
0938 AM HST.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 0928 AM HST 04 MAR 2021
COORDINATES - 29.6 SOUTH 176.0 WEST
LOCATION - KERMADEC ISLANDS REGION
MAGNITUDE - 8.0 MOMENT
EVALUATION
BASED ON ALL AVAILABLE DATA A TSUNAMI MAY HAVE BEEN GENERATED BY
THIS EARTHQUAKE THAT COULD BE DESTRUCTIVE ON COASTAL AREAS EVEN
FAR FROM THE EPICENTER. AN INVESTIGATION IS UNDERWAY TO DETERMINE
IF THERE IS A TSUNAMI THREAT TO HAWAII.
IF TSUNAMI WAVES IMPACT HAWAII THE ESTIMATED EARLIEST ARRIVAL OF
THE FIRST TSUNAMI WAVE IS
0435 PM HST THU 04 MAR 2021
FURTHER MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS
WARRANT UNTIL THE THREAT TO HAWAII HAS PASSED.
$$882
WEHW40 PHEB 042024
TSUHWX
HIZ001>003-005>009-012>014-016>021-023>026-042224-
/O.CON.PHEB.TS.A.0001.000000T0000Z-000000T0000Z/
BULLETIN
TSUNAMI MESSAGE NUMBER 2
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
1024 AM HST THU MAR 04 2021
TO - EMERGENCY MANAGEMENT IN THE STATE OF HAWAII
SUBJECT - TSUNAMI WATCH SUPPLEMENT
A TSUNAMI WATCH CONTINUES IN EFFECT FOR THE STATE OF HAWAII.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 0928 AM HST 04 MAR 2021
COORDINATES - 29.6 SOUTH 176.0 WEST
LOCATION - KERMADEC ISLANDS REGION
MAGNITUDE - 8.1 MOMENT
EVALUATION
BASED ON ALL AVAILABLE DATA A TSUNAMI MAY HAVE BEEN GENERATED BY
THIS EARTHQUAKE THAT COULD BE DESTRUCTIVE ON COASTAL AREAS EVEN
FAR FROM THE EPICENTER. AN INVESTIGATION IS UNDERWAY TO DETERMINE
IF THERE IS A TSUNAMI THREAT TO HAWAII.
IF TSUNAMI WAVES IMPACT HAWAII THE ESTIMATED EARLIEST ARRIVAL OF
THE FIRST TSUNAMI WAVE IS
0435 PM HST THU 04 MAR 2021
FURTHER MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS
WARRANT UNTIL THE THREAT TO HAWAII HAS PASSED.
$$914
WEHW40 PHEB 042128
TSUHWX
HIZ001>003-005>009-012>014-016>021-023>026-042328-
/O.CON.PHEB.TS.A.0001.000000T0000Z-000000T0000Z/
BULLETIN
TSUNAMI MESSAGE NUMBER 3
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
1127 AM HST THU MAR 04 2021
TO - EMERGENCY MANAGEMENT IN THE STATE OF HAWAII
SUBJECT - TSUNAMI WATCH SUPPLEMENT
A TSUNAMI WATCH CONTINUES IN EFFECT FOR THE STATE OF HAWAII.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 0928 AM HST 04 MAR 2021
COORDINATES - 29.6 SOUTH 176.0 WEST
LOCATION - KERMADEC ISLANDS REGION
MAGNITUDE - 8.1 MOMENT
MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY
GAUGE LOCATION LAT LON TIME AMPL PER
------------------- ----- ------ ----- --------------- -----
NUKUALOFA TO 21.1S 175.2W 2108Z 0.03M / 0.1FT 14MIN
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.
EVALUATION
BASED ON ALL AVAILABLE DATA A TSUNAMI MAY HAVE BEEN GENERATED BY
THIS EARTHQUAKE THAT COULD BE DESTRUCTIVE ON COASTAL AREAS EVEN
FAR FROM THE EPICENTER. AN INVESTIGATION IS UNDERWAY TO DETERMINE
IF THERE IS A TSUNAMI THREAT TO HAWAII.
IF TSUNAMI WAVES IMPACT HAWAII THE ESTIMATED EARLIEST ARRIVAL OF
THE FIRST TSUNAMI WAVE IS
0435 PM HST THU 04 MAR 2021
FURTHER MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS
WARRANT UNTIL THE THREAT TO HAWAII HAS PASSED.
$$686
WEHW40 PHEB 042220
TSUHWX
HIZ001>003-005>009-012>014-016>021-023>026-050020-
/O.CAN.PHEB.TS.A.0001.000000T0000Z-000000T0000Z/
BULLETIN
TSUNAMI MESSAGE NUMBER 4
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
1220 PM HST THU MAR 04 2021
TO - EMERGENCY MANAGEMENT IN THE STATE OF HAWAII
SUBJECT - TSUNAMI WATCH CANCELLATION
THE TSUNAMI WATCH IS CANCELLED FOR THE STATE OF HAWAII EFFECTIVE
AT 1220 PM HST.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 0928 AM HST 04 MAR 2021
COORDINATES - 29.6 SOUTH 176.0 WEST
LOCATION - KERMADEC ISLANDS REGION
MAGNITUDE - 8.1 MOMENT
MEASUREMENTS OR REPORTS OF TSUNAMI WAVE ACTIVITY
GAUGE LOCATION LAT LON TIME AMPL PER
------------------- ----- ------ ----- --------------- -----
NUKUALOFA TO 21.1S 175.2W 2129Z 0.05M / 0.2FT 30MIN
LAT - LATITUDE (N-NORTH, S-SOUTH)
LON - LONGITUDE (E-EAST, W-WEST)
TIME - TIME OF THE MEASUREMENT (Z IS UTC IS GREENWICH TIME)
AMPL - TSUNAMI AMPLITUDE MEASURED RELATIVE TO NORMAL SEA LEVEL.
IT IS ...NOT... CREST-TO-TROUGH WAVE HEIGHT.
VALUES ARE GIVEN IN BOTH METERS(M) AND FEET(FT).
PER - PERIOD OF TIME IN MINUTES(MIN) FROM ONE WAVE TO THE NEXT.
EVALUATION
BASED ON ALL AVAILABLE DATA THERE IS NO TSUNAMI THREAT TO THE
STATE OF HAWAII. THEREFORE... THE TSUNAMI WATCH FOR HAWAII IS NOW
CANCELLED.
THIS WILL BE THE FINAL MESSAGE ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED.
$$118
WEHW40 PHEB 290625
TSUHWX
HIZ001-003-006>007-009-016>018-023-026-029>035-037>050-051>054-
290825-
/O.NEW.PHEB.TS.A.0001.210729T0625Z-000000T0000Z/
BULLETIN
TSUNAMI MESSAGE NUMBER 1
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
825 PM HST WED JUL 28 2021
TO - EMERGENCY MANAGEMENT IN THE STATE OF HAWAII
SUBJECT - TSUNAMI WATCH
A TSUNAMI WATCH IS ISSUED FOR THE STATE OF HAWAII EFFECTIVE AT
0825 PM HST.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 0816 PM HST 28 JUL 2021
COORDINATES - 55.5 NORTH 157.9 WEST
LOCATION - ALASKA PENINSULA
MAGNITUDE - 8.1 MOMENT
EVALUATION
BASED ON ALL AVAILABLE DATA A TSUNAMI MAY HAVE BEEN GENERATED BY
THIS EARTHQUAKE THAT COULD BE DESTRUCTIVE ON COASTAL AREAS EVEN
FAR FROM THE EPICENTER. AN INVESTIGATION IS UNDERWAY TO DETERMINE
IF THERE IS A TSUNAMI THREAT TO HAWAII.
IF TSUNAMI WAVES IMPACT HAWAII THE ESTIMATED EARLIEST ARRIVAL OF
THE FIRST TSUNAMI WAVE IS
1253 AM HST THU 29 JUL 2021
FURTHER MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS
WARRANT UNTIL THE THREAT TO HAWAII HAS PASSED.
$$943
WEHW40 PHEB 290732
TSUHWX
HIZ001-003-006>007-009-016>018-023-026-029>035-037>050-051>054-
290932-
/O.CON.PHEB.TS.A.0001.000000T0000Z-000000T0000Z/
BULLETIN
TSUNAMI MESSAGE NUMBER 2
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
930 PM HST WED JUL 28 2021
TO - EMERGENCY MANAGEMENT IN THE STATE OF HAWAII
SUBJECT - TSUNAMI WATCH SUPPLEMENT
A TSUNAMI WATCH CONTINUES IN EFFECT FOR THE STATE OF HAWAII.
NOTE: THE EARTHQUAKE MAGNITUDE INCREASED TO 8.2.
AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS
ORIGIN TIME - 0816 PM HST 28 JUL 2021
COORDINATES - 55.5 NORTH 157.9 WEST
LOCATION - ALASKA PENINSULA
MAGNITUDE - 8.2 MOMENT
EVALUATION
BASED ON ALL AVAILABLE DATA A TSUNAMI MAY HAVE BEEN GENERATED BY
THIS EARTHQUAKE THAT COULD BE DESTRUCTIVE ON COASTAL AREAS EVEN
FAR FROM THE EPICENTER. AN INVESTIGATION IS UNDERWAY TO DETERMINE
IF THERE IS A TSUNAMI THREAT TO HAWAII. WE ARE CURRENTLY WAITING
FOR FURTHER SEA LEVEL DATA TO DETERMINE THE HAZARD LEVEL TO
HAWAII.
IF TSUNAMI WAVES IMPACT HAWAII THE ESTIMATED EARLIEST ARRIVAL OF
THE FIRST TSUNAMI WAVE IS
1253 AM HST THU 29 JUL 2021
FURTHER MESSAGES WILL BE ISSUED HOURLY OR SOONER AS CONDITIONS
WARRANT UNTIL THE THREAT TO HAWAII HAS PASSED.
$$104 WEHW40 PHEB 290755 TSUHWX HIZ001-003-006>007-009-016>018-023-026-029>035-037>050-051>054- 290955- /O.CAN.PHEB.TS.A.0001.000000T0000Z-000000T0000Z/ BULLETIN TSUNAMI MESSAGE NUMBER 3 NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI 954 PM HST WED JUL 28 2021 TO - EMERGENCY MANAGEMENT IN THE STATE OF HAWAII SUBJECT - TSUNAMI WATCH CANCELLATION THE TSUNAMI WATCH IS CANCELLED FOR THE STATE OF HAWAII EFFECTIVE AT 0954 PM HST. AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS ORIGIN TIME - 0816 PM HST 28 JUL 2021 COORDINATES - 55.5 NORTH 157.9 WEST LOCATION - ALASKA PENINSULA MAGNITUDE - 8.2 MOMENT EVALUATION BASED ON ALL AVAILABLE DATA THERE IS NO TSUNAMI THREAT TO THE STATE OF HAWAII. THEREFORE... THE TSUNAMI WATCH FOR HAWAII IS NOW CANCELLED. THIS WILL BE THE FINAL MESSAGE ISSUED FOR THIS EVENT UNLESS ADDITIONAL DATA ARE RECEIVED. $$
Nearby
Tsunami Watches in Hawaii, 2021Tsunami Watches in American Samoa, 2021Every tsunami watch in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.