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ALERT: ABNORMALLY HIGH TIDES and DANGEROUS SURF, QLD

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ALERT: ABNORMALLY HIGH TIDES and DANGEROUS SURF, QLD

admin March 14, 2018
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Ex-tropical cyclone Linda to produce dangerous surf and abnormally high tides along the southern Queensland coast during today and Thursday.

At 10 am AEST Wednesday, ex-tropical cyclone Linda was located in the Coral Sea about 630 kilometres east to northeast of Gladstone and 760 kilometres northeast of Brisbane, moving west to southwest at 24 kilometres per hour. Tropical cyclone Linda has transitioned into a vigerous subtropical low over the past few hours. The system is expected to move towards the southwest during today before taking on a more southerly track on Thursday, and is expected to remain offshore of the southern Queensland coast.
Gale force winds over offshore waters across the southern flank of the low are expected to produce large east to southeasterly swells along exposed parts of the southern Queensland coast during today and Thursday. This will combine with high tides to cause hazardous conditions within the warning area.

Dangerous surf conditions with possible beach erosion are expected along the east coast of Fraser Island from this morning, which should extend southwards towards the Sunshine Coast and Gold Coast later this afternoon and evening. These conditions are likely to persist into Thursday.

On Thursday morning, tides are likely to exceed the highest tide of the year, with inundation of low-lying areas possible on the high tide.

Locations which may be affected include Noosa, Maroochydore, Caloundra, Coolangatta and the eastern side of Moreton, Stradbroke, and Fraser Islands.


TECHNICAL BULLETIN


TROPICAL CYCLONE TECHNICAL BULLETIN: AUSTRALIA - EASTERN REGION
Issued by BRISBANE TROPICAL CYCLONE WARNING CENTRE
at: 0234 UTC 14/03/2018
Name: Ex-Tropical Cyclone Linda
Identifier: 21U
Data At: 2300 UTC
Latitude: 21.7S
Longitude: 157.0E
Location Accuracy: within 20 nm [35 km]
Movement Towards: west southwest [252 deg]
Speed of Movement: 13 knots [24 km/h]
Maximum 10-Minute Wind: 35 knots [65 km/h]
Maximum 3-Second Wind Gust: 50 knots [95 km/h]
Central Pressure: 995 hPa
Radius of 34-knot winds NE quadrant:    
Radius of 34-knot winds SE quadrant:    
Radius of 34-knot winds SW quadrant:    
Radius of 34-knot winds NW quadrant:    
Radius of 48-knot winds NE quadrant:    
Radius of 48-knot winds SE quadrant:    
Radius of 48-knot winds SW quadrant:    
Radius of 48-knot winds NW quadrant:    
Radius of 64-knot winds:    
Radius of Maximum Winds:    
Dvorak Intensity Code: T1.5/2.5/W1.0/24HRS
Pressure of outermost isobar:
Radius of outermost closed isobar:
FORECAST DATA
Date/Time    : Location    : Loc. Accuracy: Max Wind   : Central Pressure
[UTC]        : degrees     :      nm  [km]: knots[km/h]: hPa
+06:  14/0500: 22.0S 155.8E:     030 [060]:  040  [075]:     
+12:  14/1100: 22.9S 155.6E:     045 [080]:  035  [065]: 
+18:  14/1700: 24.0S 155.4E:     055 [105]:  035  [065]:     
+24:  14/2300: 25.1S 155.6E:     070 [130]:  035  [065]:     
+36:  15/1100: 26.8S 156.7E:     090 [165]:  030  [055]:     
+48:  15/2300: 28.3S 157.9E:     110 [200]:  030  [055]:     
+60:  16/1100: 28.6S 159.1E:     130 [235]:            :     
+72:  16/2300: 28.5S 160.0E:     145 [270]:            :     
+96:  17/2300: 26.8S 159.9E:     190 [355]:            :     
+120: 18/2300: 24.4S 156.0E:     280 [515]:            :     
REMARKS:
The system has transitioned into a deep subtropical low under the influence of
strong vertical wind shear and dry mid level air infiltrating the circulation.
The LLCC is now well displaced to the north of any deep convection. The deep
convection itself has also shown a marked decrease over the last 6 to 8 hours. A
large swathe of gales extends well to the south of the system due to the
pressure gradient between ex-Linda and the ridge to the south; surface
observations from Cato Island within this area have been consistently above 34
knots for the past 12 hours, and recently reached 45 knots, and this has been
set as the current intensity. Dvorak analysis based on shear pattern with the
LLCC greater than 3/4 of a degree from the strong temperature gradient. DT is
1.5. MET and PAT agree. The final T of 1.5 was based on the DT. CI held at 2.5.

The system will remain in the area of strong vertical wind shear associated with
an upper trough over eastern Australia, and is not expected to regain tropical
characteristics. 

Movement has recently been to the west due to a transient interaction with
another small low to the north. Later today, the system should move back onto a
southwesterly track under the influence of a mid level ridge to the east, and
trough to the west. On Thursday the system should be steered predominantly by a
strong upper trough over Queensland and a mid-level ridge to its east - first
southerly, then potentially southeasterly away from the Queensland coast
depending on the strength of the subtropical low.

Queensland Fire and Emergency Services advises that people should:
* Surf Life Saving Australia recommends that you stay out of the water and stay well away from surf-exposed areas.
* Check your property regularly for erosion or inundation by sea water, and if necessary raise goods and electrical items.
* If near the coastline, stay well away from the water’s edge.
* Never drive, walk or ride through flood waters. If it’s flooded, forget it.
* Keep clear of creeks and storm drains.
* For emergency assistance contact the SES on 132 500.


 

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