Overall Red Tropical Cyclone alert for MAWAR-23 in Guam from 20 May 2023 00:00 UTC to 06:00

GDACS is a cooperation framework between the United Nations, the European Commission and disaster managers worldwide to improve alerts, information exchange and coordination in the first phase after major sudden-onset disasters.

Overall Red alert Tropical Cyclone for MAWAR-23

in Guam

20 May 2023 06 UTC

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Meteorological source:

GDACS JTWC

Impact Single TC

Impact based on all weather systems in the area

Impact

Tropical Cyclone MAWAR-23 can have a high humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

Meteorological source	GDACS
Glide number:	TC-2023-000077-GUM
Exposed countries	Guam
Exposed population	170 thousand in Category 1 or higher
Maximum wind speed	296 km/h
Maximum storm surge	0.2 m (24 May 00:00 UTC)
Vulnerability	Medium (Guam)

GDACS Score

GDACS alert score for Tropical Cyclones is 0.5 (GREEN Alert), 1.5 (ORANGE Alert), 2.5 (RED Alert)
For more info on GDACS alert score click here.

	Wind	Storm surge	Rainfall	GDACS score
Current	157 km/h	0.2 m	n.a.	1.5
Overall	296 km/h	0.2 m	n.a.	1.5
Maximum winds, storm surge, rainfall (Current: over the next 72 h, Overall: entire TC track) based on GDACS impact

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Wind

157 km/h Current Max.

Up to 25000 people in Category 1 strength or higher (see SSHS)

Impact Timeline

Alert	N°	Date (UTC)	Max Winds (km/h)	Population in Tropical Storm or higher	Population in Cat 1. or higher	Countries
	1	20 May 2023 00:00	167	230 thousand	50 thousand	Northern Mariana Islands
	2	20 May 2023 06:00	157	230 thousand	30 thousand	Guam, Northern Mariana Islands

Bulletin Timeline

N°	Date (UTC)	Category (SSHS)	Max winds (km/h)	Population in Cat.1 or higher	Population in Tropical Storm or higher	Location (lat, lon)
1	20 May 2023 00:00	Tropical depression	46	no people	2400 people	5.4, 149.1
2	20 May 2023 06:00	Tropical depression	56	no people	2400 people	5.7, 149.2
2	20 May 2023 18:00	Tropical storm	83	no people	5900 people	6.6, 148.7
2	21 May 2023 06:00	Tropical storm	102	no people	6000 people	7.5, 148.2
2	21 May 2023 18:00	Category 1	120	no people	4200 people	8.5, 147.7
2	22 May 2023 06:00	Category 1	139	no people	170000 people	10.1, 147.2
2	23 May 2023 06:00	Category 2	157	26000 people	220000 people	12.6, 146.3
2	24 May 2023 06:00	Category 2	176	3400 people	220000 people	15.1, 144.8
2	25 May 2023 06:00	Category 3	185	no people	no people	16.7, 142

Actual track of the current bulletin

The alert for forecast greater than 3 days is limited to Orange level.

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Exposed population - AoIs

Exposed population in the potential affected countries, provinces and populated places

Countries

Country	Population in Category 1 or higher strength
Guam	3200 people
Northern Mariana Is.	20000 people

Provinces

Region Province	Country	Population in Category 1 or higher strength
Guam	Guam	3200 people
Northern Mariana Is.	Northern Mariana Islands	20000 people

Critical infrastructure

Airports, ports, nuclear plants and hydrodams at risk, if affected, are listed below.

Airports

Name	IATA Code	Elevation (m)	Usage	Runway type	IFR	Runway Length (ft)
Andersen AFB	UAM	191				0
Rota I International	ROP	185	Civ.	Paved	Yes	6000
Dynasty		46				0
West Tinian	TIQ	82	Civ.	Paved	Yes	5900
Saipan International	SPN	66	Civ.	Paved	Yes	8700

Ports

Name	LOCODE	Country
Rota		Northern Mariana Islands
Tinian		Northern Mariana Islands

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Rainfall

Rainfall accumulation of the past 24h, as detected by the Global Precipitation Measurement mission of NASA. For more information, see https://www.nasa.gov/mission_pages/GPM/main/index.html.

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StormSurge

0.2 m

The maximum Storm surge height is 0.2m in Sunharon Roads, Northern Mariana Islands. This height is estimated for 24 May 2023 00:00 UTC .

The JRC has developed an experimental global storm surge model. The calculations are published about 20 minutes after a new advisory is detected by GDACS. The calculations identify the populated places affected by storm surge up to three days in advance, using the forecasted track. When forecasts change, the associated storm surge changes too and alert levels may go up or down. All links, data, statistics and maps refer to the latest available calculation. If the calculation for the last advisory is not completed, the latest available calculation is shown.

Locations affected by Storm surge (41 locations). Calculation based on advisory number 1 of 20 May 2023 00:00:00 UTC. (Simulation using 0.5 minute resolution)

Alert	Date (UTC)	Name	Country	Storm surge height (m)
	24 May 2023 00:00	Sunharon Roads	Northern Mariana Islands	0.2
	24 May 2023 00:00	Chalan Kanoa	Northern Mariana Islands	0.2
	24 May 2023 00:00	Aslito	Northern Mariana Islands	0.2
	23 May 2023 19:00	Songsong	Northern Mariana Islands	0.2
	24 May 2023 00:00	Afetna	Northern Mariana Islands	0.2
	24 May 2023 00:00	Susupi	Northern Mariana Islands	0.2
	24 May 2023 00:00	Laolao	Northern Mariana Islands	0.2
	24 May 2023 00:00	Saipan	Northern Mariana Islands	0.2
	23 May 2023 21:00	Teteto	Northern Mariana Islands	0.2
	23 May 2023 21:00	Sinapalo	Northern Mariana Islands	0.2
	23 May 2023 21:00	Rota	Northern Mariana Islands	0.1
	24 May 2023 00:00	Tanapag	Northern Mariana Islands	0.1
	24 May 2023 00:00	Kagman	Northern Mariana Islands	0.1
	24 May 2023 00:00	Garapan	Northern Mariana Islands	0.1
	24 May 2023 00:00	Mutcho	Northern Mariana Islands	0.1
	24 May 2023 00:00	San Roque	Northern Mariana Islands	0.1
	23 May 2023 12:00	Asan	Guam	0.1
	23 May 2023 12:00	Hagatna	Guam	0.1
	23 May 2023 12:00	Sinajana	Guam	0.1
	23 May 2023 12:00	Mongmong	Guam	0.1
	23 May 2023 12:00	Yona	Guam	0.1
	23 May 2023 12:00	Tamuning	Guam	0.1
	23 May 2023 12:00	Barrigada	Guam	0.1
	23 May 2023 12:00	Camp Quezon	Guam	0.1
	23 May 2023 12:00	Harmon Village	Guam	0.1
	23 May 2023 12:00	Oceanview	Guam	0.1
	23 May 2023 12:00	Dededo	Guam	0.1
	23 May 2023 12:00	South Acres	Guam	0.1
	23 May 2023 12:00	Asbeco	Guam	0.1
	23 May 2023 12:00	Adacao	Guam	0.1
	23 May 2023 12:00	Ipapao	Guam	0.1
	23 May 2023 12:00	Potts Junction	Guam	0.1
	23 May 2023 12:00	Perez Acres	Guam	0.1
	23 May 2023 12:00	Gayinero	Guam	0.1
	23 May 2023 12:00	Spring Hill Subdivision	Guam	0.1
	23 May 2023 12:00	Upi	Guam	0.1
	23 May 2023 12:00	Asatdas	Guam	0.1
	23 May 2023 12:00	Lupog	Guam	0.1
	23 May 2023 17:00	Lockwood Terrace	Guam	0.1
	23 May 2023 17:00	Camp Bright	Guam	0.1
	23 May 2023 17:00	Piti	Guam	0.1

Disclaimer
While we try everything to ensure accuracy, this information is purely indicative and should not be used for any decision making without alternate sources of information.
The JRC is not responsible for any damage or loss resulting from the use of the information presented on this website.
The designations employed and the presentation of material on the map do not imply the expression of any opinion whatsoever on the part of the European Union concerning the legal status of any country, territory or area or of its authorities, or concerning the delimitation of its frontiers or boundaries.