Overall Red alert Tropical Cyclone for MAWAR-23
in Guam

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 0.5 m (24 May 06:00 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 167 km/h 0.5 m n.a. 1.5
Overall 296 km/h 0.5 m n.a. 1.5

Maximum winds, storm surge, rainfall (Current: over the next 72 h, Overall: entire TC track) based on GDACS impact

Wind

167 km/h Current Max.

Up to 170000 people in Category 1 strength or higher (see SSHS)

Impact Timeline

Alert Date (UTC) Max Winds (km/h) Population in
Tropical Storm or higher
Population in
Cat 1. or higher
Countries
Orange 1 20 May 2023 00:00 167 230 thousand 50 thousand Northern Mariana Islands
Orange 2 20 May 2023 06:00 157 230 thousand 30 thousand Guam, Northern Mariana Islands
Orange 3 20 May 2023 12:00 167 230 thousand 50 thousand Guam, Northern Mariana Islands
Orange 4 20 May 2023 18:00 167 230 thousand 170 thousand Guam

Bulletin Timeline

Alert Date (UTC) Category
(SSHS)
Max winds
(km/h)
Population in
Cat.1 or higher
Population in
Tropical Storm
or higher
Location (lat, lon) Countries
GREEN
1 20 May 2023 00:00 Tropical depression 46 no people 2400 people 5.4, 149.1
GREEN
2 20 May 2023 06:00 Tropical depression 56 no people 2400 people 5.7, 149.2
GREEN
3 20 May 2023 12:00 Tropical storm 65 no people 4400 people 5.7, 149.3
GREEN
4 20 May 2023 18:00 Tropical storm 83 no people 4400 people 6.1, 149.2
GREEN
4 21 May 2023 06:00 Tropical storm 102 no people 5900 people 7.2, 148.7
GREEN
4 21 May 2023 18:00 Category 1 120 no people 4100 people 8.4, 148
GREEN
4 22 May 2023 06:00 Category 1 130 no people <1000 people 9.8, 147.1
GREEN
4 22 May 2023 18:00 Category 1 148 no people 220000 people 11, 146.7
ORANGE
4 23 May 2023 18:00 Category 2 167 170000 people 220000 people 13, 145.7
GREEN
4 24 May 2023 18:00 Category 3 185 no people 220000 people 14.4, 144
GREEN
4 25 May 2023 18:00 Category 3 194 no people no people 15.9, 140.5
Actual track of the current bulletin
The alert for forecast greater than 3 days is limited to Orange level.
Download:



Exposed population - AoIs

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

Countries

Country Population in Category 1 or higher strength
Guam 170000 people

Provinces

Region Province Country Population in Category 1 or higher strength
Guam Guam 170000 people

Populated places

Name Region Province Country City class Population
Hagåtña Guam Capital 1000 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)
A.B. Won Pat International GUM 91 0
Andersen AFB UAM 191 0
Rota I International ROP 185 Civ. Paved Yes 6000

Ports

Name LOCODE Country
Apra (Agana) GUAPR Guam
Apra Harbor Guam
Rota Northern Mariana Islands

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.

...

StormSurge

0.5 m

The maximum Storm surge height is  0.5m in Harmon Village, Guam. This height is estimated for 24 May 2023 06:00 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 (36 locations). Calculation based on advisory number 4 of 20 May 2023 18:00:00 UTC. (Simulation using 0.5 minute resolution)

Alert Date (UTC) Name Country Storm surge height (m)
24 May 2023 06:00 Harmon Village Guam  0.5
24 May 2023 06:00 Oceanview Guam  0.5
24 May 2023 06:00 Dededo Guam  0.5
24 May 2023 06:00 Asan Guam  0.4
24 May 2023 06:00 Hagatna Guam  0.4
24 May 2023 06:00 Mongmong Guam  0.4
24 May 2023 06:00 Tamuning Guam  0.4
24 May 2023 05:00 Upi Guam  0.3
24 May 2023 06:00 Piti Guam  0.3
24 May 2023 06:00 Sinajana Guam  0.3
24 May 2023 04:00 Lupog Guam  0.3
24 May 2023 05:00 Potts Junction Guam  0.3
24 May 2023 04:00 Gayinero Guam  0.3
24 May 2023 04:00 Asatdas Guam  0.3
24 May 2023 08:00 Lockwood Terrace Guam  0.2
24 May 2023 08:00 Agat Guam  0.2
24 May 2023 08:00 Camp Bright Guam  0.2
24 May 2023 08:00 Santa Rita Guam  0.2
24 May 2023 06:00 Umatac Guam  0.2
24 May 2023 04:00 Merizo Guam  0.2
24 May 2023 04:00 Inarajan Guam  0.2
24 May 2023 04:00 Perez Acres Guam  0.2
24 May 2023 04:00 Spring Hill Subdivision Guam  0.2
24 May 2023 11:00 Songsong Northern Mariana Islands  0.2
24 May 2023 06:00 Ylig Guam  0.1
24 May 2023 06:00 Yona Guam  0.1
24 May 2023 06:00 Camp Quezon Guam  0.1
24 May 2023 04:00 South Acres Guam  0.1
24 May 2023 04:00 Asbeco Guam  0.1
24 May 2023 04:00 Adacao Guam  0.1
24 May 2023 04:00 Ipapao Guam  0.1
24 May 2023 04:00 Talofofo Guam  0.1
24 May 2023 04:00 Barrigada Guam  0.1
24 May 2023 12:00 Teteto Northern Mariana Islands  0.1
24 May 2023 13:00 Rota Northern Mariana Islands  0.1
24 May 2023 13:00 Sinapalo Northern Mariana Islands  0.1