Overall Green Tropical Cyclone alert for HENRI-21 in United States from 16 Aug 2021 03:00 UTC to 23 Aug 2021 03:00 UTC

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 Green alert Tropical Cyclone for HENRI-21

in United States

20 Aug 2021 12 UTC

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to select bulletin time

Meteorological source:

GDACS NOAA

Impact Single TC

Impact based on all weather systems in the area

Impact

Tropical Cyclone HENRI-21 can have a low humanitarian impact based on the maximum sustained wind speed,exposed population and vulnerability.

Meteorological source	GFS
Exposed countries	United States
Exposed population	No people in Category 1 or higher
Maximum wind speed	122 km/h
Maximum storm surge	0.2 m (20 Aug 12:30 UTC)
Vulnerability	Low (United States)

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
GFS Current	122 km/h	0.2 m	221 mm	0.5
GFS Overall	126 km/h	0.7 m	810 mm	0.5
Maximum winds, storm surge, rainfall (Current: over the next 72 h, Overall: entire TC track)

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Wind

Wind exposed population - AoIs

Estimations based on the bulletin of 20 Aug 2021 12:00 UTC

Category	Country	Population
Tropical Storm	United States	132,789

See TC classification SSHS

Wind Impact Timeline

people affected <=10000

10000< people affected <=100000

people affected >100000

N°	Date (UTC)	Max Winds (km/h)	Pop in Cat. 1 or higher	TS	Cat. 1	Cat. 2	Cat. 3	Cat. 4	Cat. 5	Countries
1	16 Aug 2021 00:00	32	-	-	-	-	-	-	-
2	16 Aug 2021 06:00	40	-	-	-	-	-	-	-
3	16 Aug 2021 12:00	72	-	-	-	-	-	-	-
4	16 Aug 2021 18:00	58	-	-	-	-	-	-	-
5	17 Aug 2021 00:00	54	-	-	-	-	-	-	-
6	17 Aug 2021 06:00	97	-	-	-	-	-	-	-
7	17 Aug 2021 12:00	83	-	-	-	-	-	-	-
8	17 Aug 2021 18:00	104	-	-	-	-	-	-	-
9	18 Aug 2021 00:00	94	-	-	-	-	-	-	-
10	18 Aug 2021 06:00	97	-	-	-	-	-	-	-
11	18 Aug 2021 12:00	119	-	-	-	-	-	-	-
12	18 Aug 2021 18:00	108	-	-	-	-	-	-	-
13	19 Aug 2021 00:00	119	-	-	-	-	-	-	-
14	19 Aug 2021 06:00	115	-	-	-	-	-	-	-
15	19 Aug 2021 12:00	126	-	-	-	-	-	-	-
16	19 Aug 2021 18:00	104	-	-	-	-	-	-	-
17	20 Aug 2021 00:00	94	-	-	-	-	-	-	-
18	20 Aug 2021 06:00	101	-	-	-	-	-	-	-
19	20 Aug 2021 12:00	148	-		-	-	-	-	-	United States

Download:

Impact estimation for the next 72h

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Rainfall

810 mm

Up to 1.6 million can be affected by rain higher than 100mm (see SSHS)

Rain exposed population - AoIs

Estimations based on the bulletin of 20 Aug 2021 12:00 UTC

Level	Country	Population
100-250 mm	United States	1,588,757
50-100 mm	United States	2,070,174

Rain Impact Timeline

people affected <=10000

10000< people affected <=100000

people affected >100000

N°	Date (UTC)	Max Rainfall (mm)	Pop >100mm or higher	50-100	100-250	250-500	500-750	750-1000	>1000	Countries
1	16 Aug 2021 00:00	24	-	-	-	-	-	-	-
2	16 Aug 2021 06:00	23	-	-	-	-	-	-	-
3	16 Aug 2021 12:00	124	-	-	-	-	-	-	-
4	16 Aug 2021 18:00	119	-	-	-	-	-	-	-
5	17 Aug 2021 00:00	35	-	-	-	-	-	-	-
6	17 Aug 2021 06:00	130	-	-	-	-	-	-	-
7	17 Aug 2021 12:00	77	-	-	-	-	-	-	-
8	17 Aug 2021 18:00	48	-	-	-	-	-	-	-
9	18 Aug 2021 00:00	86	-	-	-	-	-	-	-
10	18 Aug 2021 06:00	74	-	-	-	-	-	-	-
11	18 Aug 2021 12:00	134	-	-	-	-	-	-	-
12	18 Aug 2021 18:00	132	-	-	-	-	-	-	-
13	19 Aug 2021 00:00	126	-		-	-	-	-	-	United States
14	19 Aug 2021 06:00	120	-		-	-	-	-	-	United States
15	19 Aug 2021 12:00	139	-		-	-	-	-	-	United States
16	19 Aug 2021 18:00	160	-	-	-	-	-	-	-
17	20 Aug 2021 00:00	141	-	-	-	-	-	-	-
18	20 Aug 2021 06:00	113	-	-	-	-	-	-	-
19	20 Aug 2021 12:00	318	1.6 million			-	-	-	-	United States

Impact estimation for the next 72h

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StormSurge

0.2 m

The maximum Storm surge height is 0.2m in Larry's River, Canada. This height is estimated for 20 Aug 2021 12:30 UTC .

The JRC has developed an experimental global storm surge model, which is run after each advisory issued by the regional tropical cyclone centres. 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.

Storm Surge Exposed population - AoIs

Storm Surge Exposed locations

Calculation based on the bulletin of 20 Aug 2021 12:00 UTC

Alert	Date (UTC)	Name	Country	Storm surge height (m)
	20 Aug 2021 12:30	Larry's River	Canada	0.2
	20 Aug 2021 12:30	Half Island Cove	Canada	0.2
	20 Aug 2021 12:30	Whitehead	Canada	0.2
	20 Aug 2021 12:45	Port Hawkesbury	Canada	0.2
	20 Aug 2021 12:45	Point Tupper	Canada	0.2
	20 Aug 2021 12:45	Evanston	Canada	0.2
	20 Aug 2021 12:30	Arichat	Canada	0.2
	20 Aug 2021 12:30	Canso	Canada	0.2
	20 Aug 2021 12:30	D'Escousse	Canada	0.2
	20 Aug 2021 12:45	Petit-de-Grat	Canada	0.2
	20 Aug 2021 12:00	Gabarus	Canada	0.2
	20 Aug 2021 12:15	Fourchu	Canada	0.2
	20 Aug 2021 12:15	Saint Peters	Canada	0.2
	20 Aug 2021 12:15	L'Ardoise	Canada	0.2
	20 Aug 2021 12:15	Soldiers Cove	Canada	0.2
	20 Aug 2021 12:15	Grand River	Canada	0.2
	20 Aug 2021 17:30	Robbinston	United States	0.1
	20 Aug 2021 17:30	Perry	United States	0.1
	20 Aug 2021 17:30	Saint Andrews	Canada	0.1
	20 Aug 2021 17:30	Pleasant Point	United States	0.1
	20 Aug 2021 17:30	Quoddy	United States	0.1
	20 Aug 2021 17:30	Eastport	United States	0.1
	20 Aug 2021 17:30	Richardson	Canada	0.1
	20 Aug 2021 17:30	Welshpool	Canada	0.1
	20 Aug 2021 17:30	L'Etete	Canada	0.1
	20 Aug 2021 17:30	Saint George	Canada	0.1
	20 Aug 2021 14:15	Port Greville	Canada	0.1
	20 Aug 2021 14:15	Canning	Canada	0.1
	20 Aug 2021 14:15	Scots Bay	Canada	0.1
	20 Aug 2021 14:15	Kingsport	Canada	0.1
	20 Aug 2021 14:15	Parrsboro	Canada	0.1
	20 Aug 2021 14:45	Mahone Bay	Canada	0.1
	20 Aug 2021 14:45	La Have	Canada	0.1
	20 Aug 2021 14:45	Lunenburg	Canada	0.1
	20 Aug 2021 15:00	Halifax	Canada	0.1
	20 Aug 2021 15:00	Dartmouth	Canada	0.1
	20 Aug 2021 15:00	Eastern Passage	Canada	0.1
	20 Aug 2021 14:15	Hubbards	Canada	0.1
	20 Aug 2021 14:15	Ingramport	Canada	0.1
	20 Aug 2021 14:15	Indian Harbour	Canada	0.1
	20 Aug 2021 14:15	French Village	Canada	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.