SIO: SEAN - Post-Tropical

[Subtrop]

90S INVEST 250114 0000 17.8S 110.9E SHEM 15 1006

[StormWeather]

Is now High and TCFA



WTXS21 PGTW 172230
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE FORMATION ALERT (INVEST 90S)//
RMKS/
1. FORMATION OF A SIGNIFICANT TROPICAL CYCLONE IS POSSIBLE WITHIN
140 NM EITHER SIDE OF A LINE FROM 18.6S 119.8E TO 21.2S 113.4E
WITHIN THE NEXT 12 TO 24 HOURS. AVAILABLE DATA DOES NOT JUSTIFY
ISSUANCE OF NUMBERED TROPICAL CYCLONE WARNINGS AT THIS TIME.
WINDS IN THE AREA ARE ESTIMATED TO BE 25 TO 30 KNOTS. METSAT
IMAGERY AT 172230Z INDICATES THAT A CIRCULATION CENTER IS LOCATED
NEAR 19.2S 119.9E. THE SYSTEM IS MOVING SOUTHWESTWARD AT 09
KNOTS.
2. REMARKS: THE AREA OF CONVECTION (INVEST 90S) PREVIOUSLY LOCATED 19.2S
119.5E IS NOW LOCATED 19.2S 119.9E, APPROXIMATELY 371 NM EAST-NORTHEAST
OF LEARMONTH. ANIMATED ENHANCED INFRARED SATELLITE IMAGERY AND AN 171916Z
SSMIS F18 91GHZ MICROWAVE SATELLITE IMAGE DEPICT CURVED CLOUD BANDS FROM
THE NORTH-NORTHWEST WRAPPING INTO A QUICKLY CONSOLIDATING LLCC JUST OFF
THE COAST OF AUSTRALIA, WITH CONVECTION BUILDING OVER THE CENTER AND JUST
NORTH OF THE SYSTEM. ENVIRONMENTAL ANALYSIS INDICATES INVEST 90S IS IN A
CONDUCIVE ENVIRONMENT FOR FURTHER DEVELOPMENT DUE TO VERY WARM (30-32C)
SEA SURFACE TEMPERATURES, LOW (5-10 KNOTS) VERTICAL WIND SHEAR, AND
MODERATE POLEWARD OUTFLOW ALOFT. GLOBAL DETERMINISTIC AND ENSEMBLE MODELS
ARE IN GOOD AGREEMENT THAT 90S WILL CONTINUE TO CONSOLIDATE OVER THE NEXT
24 HOURS AND TRACK TO THE SOUTHWEST. MAXIMUM SUSTAINED SURFACE WINDS ARE
ESTIMATED AT 25 TO 30 KNOTS. MINIMUM SEA LEVEL PRESSURE IS ESTIMATED TO
BE NEAR 997 MB. THE POTENTIAL FOR THE DEVELOPMENT OF A SIGNIFICANT
TROPICAL CYCLONE WITHIN THE NEXT 24 HOURS IS HIGH.
3. THIS ALERT WILL BE REISSUED, UPGRADED TO WARNING OR CANCELLED BY
182230Z.//
NNNN

[StormWeather]

SH,90,2025011800, , BEST,0, 193S, 1191E,35,996, TS,34, NEQ,50,40,40,40,1006,425,25,0,0, S,0, ,0,0, INVEST, , ,,,,,,,,,,

Likely to see Invest 90S upgraded to Tropical Cyclone status soon with the designation of 09S. Next name in the Australian Region is Sean.

[cycloneye]

Issued at 8:45 am WST on Saturday 18 January 2025

Headline:
Gale-force winds expected along the Pilbara coast as tropical cyclone develops.

Areas Affected:
Warning Zone
De Grey to Mardie, including Port Hedland, Karratha and Dampier.

Watch Zone
Mardie to Ningaloo, including Onslow and Exmouth.

Cancelled Zone
None.

Details of Tropical Low 11U at 8:00 am AWST:
Intensity: Tropical Low, sustained winds near the centre of 55 kilometres per hour with wind gusts to 85 kilometres per hour.

Location: within 45 kilometres of 19.3 degrees South 119.2 degrees East, estimated to be 130 kilometres north northeast of Port Hedland and 290 kilometres east northeast of Karratha.

Movement: west southwest at 16 kilometres per hour.

A tropical low north of the Pilbara coast is expected to develop into a tropical cyclone on Sunday. The developing low is expected to move west, parallel to the Pilbara coast today and on Sunday. From Monday, the cyclone is expected to be moving southwest and away from the WA coast.

Hazards:
GALES with DAMAGING WIND GUSTS may develop about coastal and island communities between De Grey and Dampier including Port Hedland, Karratha and Dampier from early Sunday morning extending west to Mardie later Sunday morning.

GALES with DAMAGING WIND GUSTS may extend from Mardie to Exmouth later on Sunday and to Ningaloo early Monday as the system moves further west.

As the system moves westwards, parallel to north WA coast during the weekend, a storm tide is expected between De Grey and Exmouth during Sunday and Monday. Large waves may produce minor flooding along the foreshore. People living in areas likely to be affected by this flooding should take measures to protect their property as much as possible and be prepared to help their neighbours.

[StormWeather]

Is now 10S!!!

Tropical Cyclone TEN
As of 00:00 UTC Jan 18, 2025:

Location: 19.3°S 119.1°E
Maximum Winds: 35 kt Gusts: N/A
Minimum Central Pressure: 996 mb
Environmental Pressure: N/A
Radius of Circulation: N/A
Radius of Maximum wind: 90 nm
34 kt Wind Radii by Quadrant:

[StormWeather]

Is now 10S!!!

Tropical Cyclone TEN
As of 00:00 UTC Jan 18, 2025:

Location: 19.3°S 119.1°E
Maximum Winds: 35 kt Gusts: N/A
Minimum Central Pressure: 996 mb
Environmental Pressure: N/A
Radius of Circulation: N/A
Radius of Maximum wind: 90 nm
34 kt Wind Radii by Quadrant:

NEQ,50,40,40,40,1004,330,25,0,0, S,0, ,0,0, TEN, M, 0, ,0.0,0.0,0.0,0.0, TRANSITIONED, shD02025 to sh102025, ,,

[StormWeather]

Is now Tropical Cyclone 10S by the JTWC

WTXS32 PGTW 180300
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE 10S (TEN) WARNING NR 001//
REF/A/MSG/JOINT TYPHOON WRNCEN PEARL HARBOR HI/172221ZJAN2025//
AMPN/REF A IS A TROPICAL CYCLONE FORMATION ALERT.//
RMKS/
1. TROPICAL CYCLONE 10S (TEN) WARNING NR 001
02 ACTIVE TROPICAL CYCLONES IN SOUTHIO
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
---
WARNING POSITION:
180000Z --- NEAR 19.3S 119.1E
MOVEMENT PAST SIX HOURS - 260 DEGREES AT 08 KTS
POSITION ACCURATE TO WITHIN 060 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT
040 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
040 NM NORTHWEST QUADRANT
REPEAT POSIT: 19.3S 119.1E
---
FORECASTS:
12 HRS, VALID AT:
181200Z --- 19.3S 118.2E
MAX SUSTAINED WINDS - 050 KT, GUSTS 065 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 010 NM NORTHEAST QUADRANT
025 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
010 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 100 NM NORTHEAST QUADRANT
080 NM SOUTHEAST QUADRANT
070 NM SOUTHWEST QUADRANT
060 NM NORTHWEST QUADRANT
VECTOR TO 24 HR POSIT: 255 DEG/ 08 KTS
---
24 HRS, VALID AT:
190000Z --- 19.7S 116.6E
MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 010 NM NORTHEAST QUADRANT
015 NM SOUTHEAST QUADRANT
015 NM SOUTHWEST QUADRANT
010 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT
040 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 140 NM NORTHEAST QUADRANT
140 NM SOUTHEAST QUADRANT
110 NM SOUTHWEST QUADRANT
100 NM NORTHWEST QUADRANT
VECTOR TO 36 HR POSIT: 250 DEG/ 10 KTS
---
36 HRS, VALID AT:
191200Z --- 20.4S 114.6E
MAX SUSTAINED WINDS - 080 KT, GUSTS 100 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 020 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
010 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 050 NM NORTHEAST QUADRANT
060 NM SOUTHEAST QUADRANT
040 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 170 NM NORTHEAST QUADRANT
160 NM SOUTHEAST QUADRANT
140 NM SOUTHWEST QUADRANT
120 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 245 DEG/ 11 KTS
---
EXTENDED OUTLOOK:
48 HRS, VALID AT:
200000Z --- 21.3S 112.4E
MAX SUSTAINED WINDS - 090 KT, GUSTS 110 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 030 NM NORTHEAST QUADRANT
040 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
020 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 060 NM NORTHEAST QUADRANT
070 NM SOUTHEAST QUADRANT
060 NM SOUTHWEST QUADRANT
040 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 180 NM NORTHEAST QUADRANT
160 NM SOUTHEAST QUADRANT
150 NM SOUTHWEST QUADRANT
120 NM NORTHWEST QUADRANT
VECTOR TO 72 HR POSIT: 240 DEG/ 11 KTS
---
72 HRS, VALID AT:
210000Z --- 23.6S 108.3E
MAX SUSTAINED WINDS - 085 KT, GUSTS 105 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 010 NM NORTHEAST QUADRANT
020 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
010 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 050 NM NORTHEAST QUADRANT
060 NM SOUTHEAST QUADRANT
060 NM SOUTHWEST QUADRANT
040 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 150 NM NORTHEAST QUADRANT
150 NM SOUTHEAST QUADRANT
150 NM SOUTHWEST QUADRANT
130 NM NORTHWEST QUADRANT
VECTOR TO 96 HR POSIT: 230 DEG/ 08 KTS
---
LONG RANGE OUTLOOK:
---
96 HRS, VALID AT:
220000Z --- 25.8S 105.5E
MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 060 NM NORTHEAST QUADRANT
060 NM SOUTHEAST QUADRANT
080 NM SOUTHWEST QUADRANT
070 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 120 NM NORTHEAST QUADRANT
160 NM SOUTHEAST QUADRANT
170 NM SOUTHWEST QUADRANT
130 NM NORTHWEST QUADRANT
VECTOR TO 120 HR POSIT: 225 DEG/ 07 KTS
---
120 HRS, VALID AT:
230000Z --- 27.6S 103.3E
MAX SUSTAINED WINDS - 040 KT, GUSTS 050 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 090 NM NORTHEAST QUADRANT
180 NM SOUTHEAST QUADRANT
190 NM SOUTHWEST QUADRANT
130 NM NORTHWEST QUADRANT
---

[cycloneye]

Is now 10S!!!

Tropical Cyclone TEN
As of 00:00 UTC Jan 18, 2025:

Location: 19.3°S 119.1°E
Maximum Winds: 35 kt Gusts: N/A
Minimum Central Pressure: 996 mb
Environmental Pressure: N/A
Radius of Circulation: N/A
Radius of Maximum wind: 90 nm
34 kt Wind Radii by Quadrant:

The official agency for this area is the BoM of Australia and not JTWC.

http://www.bom.gov.au/products/IDW60281.shtml

[StormWeather]

Is now 10S!!!

Tropical Cyclone TEN
As of 00:00 UTC Jan 18, 2025:

Location: 19.3°S 119.1°E
Maximum Winds: 35 kt Gusts: N/A
Minimum Central Pressure: 996 mb
Environmental Pressure: N/A
Radius of Circulation: N/A
Radius of Maximum wind: 90 nm
34 kt Wind Radii by Quadrant:

The official agency for this area is the BoM of Australia and not JTWC.

http://www.bom.gov.au/products/IDW60281.shtml

Do we note the JTWC as well for storms?

[cycloneye]

Details of Tropical Low 11U at 5:00 pm AWST:
Intensity: Tropical Low, sustained winds near the centre of 55 kilometres per hour with wind gusts to 85 kilometres per hour.

Location: within 65 kilometres of 19.1 degrees South 117.4 degrees East, estimated to be 185 kilometres northwest of Port Hedland and 190 kilometres north northeast of Karratha.

Movement: west at 19 kilometres per hour.

A tropical low north of the Pilbara coast is expected to develop into a tropical cyclone on Sunday. The developing low is expected to move west, parallel to the Pilbara coast tonight and on Sunday. From Monday, the cyclone is expected to be moving southwest and away from the WA coast.

Hazards:
GALES with DAMAGING WIND GUSTS may develop about coastal and island communities between De Grey and Dampier including Port Hedland, Karratha and Dampier from later tonight, extending west to Mardie later Sunday morning, Exmouth Sunday evening, and to Ningaloo early Monday.

As the system moves westwards, parallel to north WA coast during the weekend, a storm tide is expected between De Grey and Exmouth during Sunday and Monday. Large waves may produce minor flooding along the foreshore. People living in areas likely to be affected by this flooding should take measures to protect their property as much as possible and be prepared to help their neighbours.


REMARKS:
Tropical Low 11U continues to show signs of development with curved banding
starting to improve.

The low level centre of this system likely remains elongated with possible
multiple centres due to interactions over the last 24 hours with weakening
tropical low 10U. Scatterometry at 0148 UTC (ASCAT-C) and 0330 UTC (Oceansat-3)
showed elongated centres as far north as 18.7S. However, over the last hour
radar and visible imagery suggest a more defined low level centre as far south
as 19.2S. No recent microwave passes available. The centre was biased towards
scatterometry with a uncertainty of 50 nm. The system has started to take a
more west southwest movement over the last 3 hours.

Intensity: 30 kn based on scatterometry and observations at Bedout Island.
Dvorak DT2.5, based on a 0.5 wrap on small tighter band on the southern side of
the system. MET and PAT not possible (no 24 trend available). CI/FT2.0 based on
DT with FT constraints. Objective aids all started around 0000 UTC and are ADT
39 kn, AiDT 36 kn, DPrint 33 kn (all 1 min mean).

There is good model consensus the system will track to the west southwest over
the weekend, parallel and offshore of the Pilbara coast, under the influence of
a strong mid level ridge. It is likely to be well off the Northwest Cape of
Western Australia on Monday before it starts to track to the southwest,
remaining well offshore of the mainland. The system is in a very favourable
environment for development lying under the upper ridge with low shear (CIMSS
10 kn at 0000 UTC 18 January), good upper divergence in all sectors and a moist
environment. Sea surfaces temperatures are exceptionally high north of the
Pilbara at 31 degrees. The system is expected to develop further possibly
reaching tropical cyclone strength on Sunday and category 3 by Monday.
Potential rapid intensification could occur during Sunday.

[cycloneye]

TROPICAL CYCLONE ADVICE NUMBER 12
Issued at 5:32 am WST on Sunday 19 January 2025

Headline:
High chance of a tropical cyclone forming off the Pilbara coast today.

Areas Affected:
Warning Zone
Port Hedland to Ningaloo, including Karratha, Dampier, Onslow and Exmouth.

Details of Tropical Low 11U at 5:00 am AWST:
Intensity: Tropical Low, sustained winds near the centre of 75 kilometres per hour with wind gusts to 100 kilometres per hour.

Location: within 30 kilometres of 19.5 degrees South 116.7 degrees East, estimated to be 220 kilometres west northwest of Port Hedland and 140 kilometres north of Karratha.

Movement: west southwest at 9 kilometres per hour.

A tropical low north of the Pilbara coast is expected to develop into a tropical cyclone today. The developing low is expected to continue moving west, parallel to the Pilbara coast. From Monday onwards, the cyclone is expected to turn towards the southwest, while remaining over open waters. By this time, the cyclone is expected to begin moving away from the coast.

Hazards:
GALES with DAMAGING WIND GUSTS about the coastal and island communities between Port Hedland and Exmouth, including Karratha and Dampier, extending west of Mardie to Ningaloo later today and tonight.

DESTRUCTIVE WIND GUSTS may occur over offshore island communities later today, and about the North West Cape early tomorrow, if the cyclone tracks a little further south than expected.

As the cyclone moves westwards, parallel to the north WA coast, a storm tide is expected between Port Hedland and Exmouth during the afternoon's high tide today and tomorrow. Large waves may produce minor flooding along the foreshore. People living in areas likely to be affected by this flooding should take measures to protect their property as much as possible and be prepared to help their neighbours.



REMARKS:
Tropical Low 11U continues to become organised with deep convection persisting
near the centre, supported by signs of convective bands to the southeast.

The ASCAT 1419Z showed a closed 30 kt circulation with gales in the southern
quadrant. Legendre Island, just off the Pilbara coast has been gales since
1630Z. Port Hedland radar shows a closed circulation 20-30nm wide surrounded by
deep convection. Location accuracy of 20nm is based on radar positioning.

Intensity: 35 kn based on surface observations. Dvorak DT2.5, based on a 0.5
wrap on the band on the southwest side of the system. MET2.5 and PAT2.5.
Available objective aids at 1800 UTC; ADT 35 kn, AiDT 36 kn, DPRINT 45 kn,
SATCON 40 kn (all 1 min mean).

There is good model consensus the system will track to the west, parallel to
the coast and remaining offshore under the influence of a strong mid-level
ridge. It is likely to be well off the North West Cape on Monday before it
starts to track towards the southwest, away from the mainland.

The system remains in a favourable environment for development lying under the
upper ridge with low shear (CIMSS 10 kn), good upper divergence in all sectors
and a moist environment. Sea surfaces temperatures are exceptionally high north
of the Pilbara at 31 degrees. The system is expected to reach tropical cyclone
strength soon and category 3 by Monday.

[cycloneye]

Is getting the look of a strong cyclone in the making. The name will be Sean.

[Subtrop]

Details of Tropical Cyclone Sean 11U at 8:00 am AWST:
Intensity: Category 1, sustained winds near the centre of 85 kilometres per hour with wind gusts to 120 kilometres per hour.

Location: within 30 kilometres of 19.6 degrees South 116.1 degrees East, estimated to be 275 kilometres west northwest of Port Hedland and 150 kilometres north northwest of Karratha.

Movement: west southwest at 13 kilometres per hour.

Tropical Cyclone Sean has formed north of the Pilbara coast this morning. Sean is expected to continue moving west, parallel to the Pilbara coast, while continuing to strengthen. From Monday onwards, the cyclone is expected to turn towards the southwest, while remaining over open waters. By this time, the cyclone is expected to begin moving away from the coast.

[cycloneye]

TROPICAL CYCLONE ADVICE NUMBER 18
Issued at 11:44 pm WST on Sunday 19 January 2025

Headline:
Tropical Cyclone Sean category 2, impacting the western Pilbara coast tonight and Monday.

Areas Affected:
Warning Zone
Whim Creek to Ningaloo, including Karratha, Dampier, Onslow and Exmouth.

Watch Zone
None.

Cancelled Zone
None.

Details of Tropical Cyclone Sean 11U at 11:00 pm AWST:
Intensity: Category 2, sustained winds near the centre of 100 kilometres per hour with wind gusts to 140 kilometres per hour.

Location: within 30 kilometres of 20.1 degrees South 113.9 degrees East, estimated to be 205 kilometres north of Exmouth and 210 kilometres northwest of Onslow.

Movement: west southwest at 15 kilometres per hour.

Tropical Cyclone Sean will continue moving west tonight, parallel to the Pilbara coast, and strengthen. Once it is west of the Pilbara on Monday it will turn to the southwest and move away from the coast.

Hazards:
HEAVY and LOCALLY INTENSE RAINFALL which may lead to FLASH FLOODING is likely between Roebourne and Mardie overnight. HEAVY and LOCALLY INTENSE RAINFALL which may lead to FLASH FLOODING is also possible over North West Cape on Monday. A Flood Watch has been issued for the Pilbara.

DESTRUCTIVE WIND GUSTS to 150 km/h may occur about the North West Cape early tomorrow, if the cyclone tracks a little further south than forecast.

GALES with DAMAGING WIND GUSTS to 120 km/h are occurring at coastal and island communities between Whim Creek and Ningaloo, including Onslow and Exmouth.

As the cyclone moves westwards, parallel to the north WA coast, a storm tide is forecast between Onslow and Exmouth during Monday's afternoon's high tide. Large waves may produce minor flooding along the foreshore. People living in areas likely to be affected by this flooding should take measures to protect their property as much as possible and be prepared to help their neighbours.

[cycloneye]

Looks very good.

[Hurricane2022]

Looks like he's trying to open a pinhole eye

[cycloneye]

Now a Cat 3.

TROPICAL CYCLONE ADVICE NUMBER 20
Issued at 5:35 am WST on Monday 20 January 2025

Headline:
Severe Tropical Cyclone Sean category 3, impacting the western Pilbara coast during Monday.

Areas Affected:
Warning Zone
Mardie to Ningaloo, including Onslow and Exmouth.

Watch Zone
None.

Cancelled Zone
Mardie to Whim Creek, including Dampier and Karratha.

Details of Severe Tropical Cyclone Sean 11U at 5:00 am AWST:
Intensity: Category 3, sustained winds near the centre of 130 kilometres per hour with wind gusts to 185 kilometres per hour.

Location: within 25 kilometres of 20.6 degrees South 113.1 degrees East, estimated to be 185 kilometres northwest of Exmouth and 240 kilometres west northwest of Onslow.

Movement: west southwest at 17 kilometres per hour.

Severe Tropical Cyclone Sean will continue moving west this morning, parallel to the Pilbara coast, and strengthen. Once it is west of the Pilbara later this morning it will turn to the southwest and move away from the coast.


Hazards:
HEAVY to LOCALLY INTENSE RAINFALL which may lead to FLASH FLOODING is possible between Mardie and North West Cape for the remainder of today. A Flood Watch has been issued for the Pilbara.

DESTRUCTIVE WIND GUSTS to 150 km/h may occur about the North West Cape early this morning, if the cyclone tracks a little further south than forecast.

GALES with DAMAGING WIND GUSTS to 120 km/h are occurring at coastal and island communities between Ningaloo and Mardie, including Onslow and Exmouth.

As the cyclone moves westwards, parallel to the north WA coast, a storm tide is forecast between Onslow and Exmouth during Monday afternoon's high tide. Large waves may produce minor flooding along the foreshore. People living in areas likely to be affected by this flooding should take measures to protect their property as much as possible and be prepared to help their neighbours.

Recommended Action:

[cycloneye]

 https://x.com/iCyclone/status/1881130070234054760

[WaveBreaking]

[cycloneye]

TROPICAL CYCLONE ADVICE NUMBER 24
Issued at 5:47 pm WST on Monday 20 January 2025

Headline:
Gales and heavy rain over the far western Pilbara coast easing tonight as Severe Tropical Cyclone Sean moves southwest away from the coast.

Areas Affected:
Warning Zone
Onslow to Ningaloo, including Exmouth and Onslow.

Watch Zone
None.

Cancelled Zone
None.

Details of Severe Tropical Cyclone Sean 11U at 5:00 pm AWST:
Intensity: Category 4, sustained winds near the centre of 175 kilometres per hour with wind gusts to 250 kilometres per hour.

Location: within 30 kilometres of 22.1 degrees South 111.2 degrees East, estimated to be 305 kilometres west of Exmouth and 405 kilometres west of Onslow.

Movement: southwest at 22 kilometres per hour.

Severe Tropical Cyclone Sean is moving to the southwest away from the WA coast. Gales are forecast to ease between Onslow and Ningaloo tonight. The category 4 cyclone continues to intensify and should peak overnight.

Hazards:
GALES with DAMAGING WIND GUSTS to 120 km/h with locally DESTRUCTIVE WIND GUSTS to 140km/h are occurring at coastal and island communities between Onslow and Ningaloo, including Onslow and Exmouth. These winds are expected to gradually ease from the east and be below gale-force by midnight tonight.

HEAVY RAINFALL which may lead to FLASH FLOODING is possible between Onslow and North West Cape during this evening with LOCALLY INTENSE RAINFALL is possible about North West Cape. Flood Warnings are current for parts of the Pilbara and northern Gascoyne regions.

A storm tide is forecast between Onslow and Exmouth with today's high tide. Large waves may produce minor flooding along the foreshore. People living in areas likely to be affected by this flooding should take measures to protect their property as much as possible and be prepared to help their neighbours.