SW Indian Ocean: TD Alvin Ex-Bertie

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HURAKAN
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#21 Postby HURAKAN » Sat Nov 19, 2005 6:04 pm

Image

It's understandable that Australia is one of the most "developed" countries in the South Hemisphere that is constantly being affected by tropical cyclones. It would be great of they could form a coalition with other countries in their hemisphere to put more money to monitor tropical cyclones. I find a lot of the tropical cyclones that form in South Pacific Ocean very interesting and they also tend to get very strong in occasion, but the information that we get I feel is very vague and inaccurate. I hope in the future the tropical cyclones in the Southern Hemisphere get more attention and studied with more detailed.
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#22 Postby P.K. » Sat Nov 19, 2005 6:25 pm

HURAKAN wrote:I find a lot of the tropical cyclones that form in South Pacific Ocean very interesting and they also tend to get very strong in occasion, but the information that we get I feel is very vague and inaccurate.


In what way? I find enough from looking at the various agencies, ok it may be in French but I can understand that.
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#23 Postby HURAKAN » Sat Nov 19, 2005 7:08 pm

P.K. wrote:
HURAKAN wrote:I find a lot of the tropical cyclones that form in South Pacific Ocean very interesting and they also tend to get very strong in occasion, but the information that we get I feel is very vague and inaccurate.


In what way? I find enough from looking at the various agencies, ok it may be in French but I can understand that.


I like the RECON a lot to say that the most accurate information can only be gain using it. Satellites are a great help, but they tend to sometimes overestimate and underestimate the intensity of tropical cyclones.
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#24 Postby P.K. » Sat Nov 19, 2005 7:49 pm

Satellites will only estimate systems, but they are pretty good. Recon must be expensive and while useful it isn't completely necessary. Even with recon you can still miss the stongest winds / lowest pressure during the storm.

We get along fine over here without recon with baroclinic systems which can have gusts well over 100mph.
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#25 Postby P.K. » Sat Nov 19, 2005 8:27 pm

HIGH SEAS WEATHER WARNING FOR METAREA 10 ISSUED BY THE
AUSTRALIAN BUREAU OF METEOROLOGY TROPICAL CYCLONE WARNING
CENTRE PERTH AT 0125UTC 20 NOVEMBER 2005

STORM WARNING FOR THE WESTERN AREA

Please be aware, wind gusts can be a further 40 percent stronger than the
averages given here, and maximum waves may be up to twice the height.

SITUATION
At 0001UTC Tropical Cyclone Bertie located within 30 nautical miles of
Latitude seven decimal seven south [7.7S]
Longitude ninety three decimal six east [93.6]
Recent movement south southwest at 8 knots.
Maximum winds 45 knots.
Central pressure 985 hPa.


AREA AFFECTED
Within 100 nautical miles of the centre, extending to 180 nautical miles in
southern quadrants.

FORECAST
Winds 35/45 knots increasing 60 knot near centre during next 12 to 24 hours.
Very rough to high seas and moderate swell increasing.

At 1200UTC 20 November: 8.6 south 93.4 east
980 hPa. Winds to 50 knots near centre.
At 0001UTC 21 November: 9.4 south 93.1 east
970 hPa. Winds to 60 knots near centre.

Next warning issued by 0700 UTC 20 November 2005.

WEATHER PERTH
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#26 Postby HURAKAN » Sat Nov 19, 2005 9:16 pm

HIGH SEAS WEATHER WARNING FOR METAREA 10 ISSUED BY THE
AUSTRALIAN BUREAU OF METEOROLOGY TROPICAL CYCLONE WARNING
CENTRE PERTH AT 0136UTC 20 NOVEMBER 2005

UPDATED STORM WARNING FOR THE WESTERN AREA

Please be aware, wind gusts can be a further 40 percent stronger than the
averages given here, and maximum waves may be up to twice the height.

SITUATION
At 0001UTC Tropical Cyclone Bertie located within 30 nautical miles of
Latitude seven decimal eight south [7.8S]
Longitude ninety three decimal four east [93.4]
Recent movement south southwest at 7 knots.
Maximum winds 50 knots.
Central pressure 985 hPa.


AREA AFFECTED
Within 100 nautical miles of the centre, extending to 180 nautical miles in
southern quadrants.

FORECAST
Winds 35/45 knots, reaching 50 knots within 25 nautical miles of the centre.
Wind increasing 60 knot near centre during next 12 to 24 hours. Very rough to
high seas and heavy swell increasing.

At 1200UTC 20 November: 8.9 south 93.0 east
980 hPa. Winds to 55 knots near centre.
At 0001UTC 21 November: 9.6 south 92.7 east
970 hPa. Winds to 60 knots near centre.

Next warning issued by 0700 UTC 20 November 2005.

WEATHER PERTH
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#27 Postby HURAKAN » Sun Nov 20, 2005 2:10 am

HIGH SEAS WEATHER WARNING FOR METAREA 10 ISSUED BY THE
AUSTRALIAN BUREAU OF METEOROLOGY TROPICAL CYCLONE WARNING
CENTRE PERTH AT 0658UTC 20 NOVEMBER 2005

HURRICANE WARNING FOR THE WESTERN AREA

Please be aware, wind gusts can be a further 40 percent stronger than the
averages given here, and maximum waves may be up to twice the height.

SITUATION
At 0600UTC Tropical Cyclone Bertie located within 30 nautical miles of
Latitude eight decimal zero south [8.0S]
Longitude ninety three decimal three east [93.3]
Recent movement south southwest at 6 knots.
Maximum winds 55 knots.
Central pressure 980 hPa.


AREA AFFECTED
Within 60 nautical miles of the centre, extending to 120 nautical miles in
southern quadrants.

FORECAST
Winds 35/45 knots, reaching 50 knots within 30 nautical miles of the centre.
Wind increasing to 50/65 knot near centre by 1200UTC 20 November and then 50/75
knots by 0600UTC 21 November. Very high seas and heavy swell increasing.

At 1800UTC 20 November: 9.1 south 92.6 east
970 hPa. Winds to 65 knots near centre.
At 0600UTC 21 November: 10.3 south 91.7 east
960 hPa. Winds to 75 knots near centre.

Next warning issued by 1300 UTC 20 November 2005.

WEATHER PERTH


It should be a "hurricane" in a few hours!
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#28 Postby P.K. » Sun Nov 20, 2005 5:15 am

Odd that the BOM still aren't producing track maps, maybe they have computer problems? :?:
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#29 Postby P.K. » Sun Nov 20, 2005 8:22 am

HIGH SEAS WEATHER WARNING FOR METAREA 10 ISSUED BY THE
AUSTRALIAN BUREAU OF METEOROLOGY TROPICAL CYCLONE WARNING
CENTRE PERTH AT 1255UTC 20 NOVEMBER 2005

HURRICANE WARNING FOR THE WESTERN AREA

Please be aware, wind gusts can be a further 40 percent stronger than the
averages given here, and maximum waves may be up to twice the height.

SITUATION
At 1200UTC Tropical Cyclone Bertie located within 30 nautical miles of
Latitude eight decimal four south [8.4S]
Longitude ninety three decimal four east [93.4]
Recent movement south southwest at 4 knots.
Maximum winds 55 knots.
Central pressure 980 hPa.


AREA AFFECTED
Within 60 nautical miles of the centre, extending to 120 nautical miles in
southern quadrants.

FORECAST
Within 30 nautical miles of centre: 45/55 knot winds with high seas and heavy
swell reaching 70 knots near centre by 211200UTC with very high to phenomenal
seas and heavy swell.
Within 60 nautical miles of the centre, extending to 120 nautical miles in
southern quadrants: Winds above 34 knots with very rough seas and moderate to
heavy swell.

At 0000UTC 21 November: 9.3 south 92.7 east
975 hPa. Winds to 60 knots near centre.
At 1200UTC 21 November: 10.7 south 91.9 east
965 hPa. Winds to 70 knots near centre.

Next warning issued by 1900 UTC 20 November 2005.

WEATHER PERTH
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#30 Postby P.K. » Sun Nov 20, 2005 2:19 pm

Looks like it is a cat 2 now then.

HIGH SEAS WEATHER WARNING FOR METAREA 10 ISSUED BY THE
AUSTRALIAN BUREAU OF METEOROLOGY TROPICAL CYCLONE WARNING
CENTRE PERTH AT 1827UTC 20 NOVEMBER 2005

HURRICANE WARNING FOR THE WESTERN AREA

Please be aware, wind gusts can be a further 40 percent stronger than the
averages given here, and maximum waves may be up to twice the height.

SITUATION
At 1800UTC Tropical Cyclone Bertie located within 30 nautical miles of
Latitude eight decimal eight south [8.8S]
Longitude ninety three decimal two east [93.2]
Recent movement south southwest at 4 knots.
Maximum winds 60 knots.
Central pressure 975 hPa.


AREA AFFECTED
Within 60 nautical miles of the centre, extending to 120 nautical miles in
southern quadrants.

FORECAST
Within 30 nautical miles of centre: 45/60 knot winds with high seas and heavy
swell reaching 70 knots near centre by 211200UTC with very high to phenomenal
seas and heavy swell.
Within 60 nautical miles of the centre, extending to 120 nautical miles in
southern quadrants: Winds above 34 knots with very rough seas and moderate to
heavy swell.

At 0600UTC 21 November: 10.2 south 92.6 east
970 hPa. Winds to 65 knots near centre.
At 1800UTC 21 November: 11.7 south 92.1 east
965 hPa. Winds to 70 knots near centre.

Next warning issued by 0100 UTC 21 November 2005.

WEATHER PERTH
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#31 Postby Forecaster Colby » Sun Nov 20, 2005 2:21 pm

About to be Cyclone Bertie, methinks.
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#32 Postby P.K. » Sun Nov 20, 2005 2:25 pm

Cat 3s (Sustained winds of 118kph+ with gusts exceeding 170kph) are known as severe tropical cyclones rather than just cyclones. :)
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#33 Postby Forecaster Colby » Sun Nov 20, 2005 2:26 pm

Conversion for kts -> kph or mph -> kph?
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#34 Postby P.K. » Sun Nov 20, 2005 3:05 pm

1kt is approx 1.84kph.

No track image from the BOM so here is one I've done using their positions:

Image
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#35 Postby HURAKAN » Sun Nov 20, 2005 3:17 pm

WTXS31 PGTW 202100
MSGID/GENADMIN/NAVPACMETOCCEN PEARL HARBOR HI/JTWC//
SUBJ/TROPICAL CYCLONE WARNING//
RMKS/
1. TROPICAL CYCLONE 03S (BERTIE) WARNING NR 003
02 ACTIVE TROPICAL CYCLONES IN SOUTHIO
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
---
WARNING POSITION:
201800Z --- NEAR 8.7S 93.4E
MOVEMENT PAST SIX HOURS - 200 DEGREES AT 03 KTS
POSITION ACCURATE TO WITHIN 060 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
RADIUS OF 050 KT WINDS - 020 NM NORTHEAST QUADRANT
020 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
020 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT
070 NM SOUTHEAST QUADRANT
070 NM SOUTHWEST QUADRANT
050 NM NORTHWEST QUADRANT
REPEAT POSIT: 8.7S 93.4E
---
FORECASTS:
12 HRS, VALID AT:
210600Z --- 10.1S 92.9E
MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
RADIUS OF 050 KT WINDS - 025 NM NORTHEAST QUADRANT
025 NM SOUTHEAST QUADRANT
025 NM SOUTHWEST QUADRANT
025 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT
075 NM SOUTHEAST QUADRANT
075 NM SOUTHWEST QUADRANT
060 NM NORTHWEST QUADRANT
VECTOR TO 24 HR POSIT: 200 DEG/ 08 KTS
---
24 HRS, VALID AT:
211800Z --- 11.6S 92.3E
MAX SUSTAINED WINDS - 060 KT, GUSTS 075 KT
RADIUS OF 050 KT WINDS - 025 NM NORTHEAST QUADRANT
025 NM SOUTHEAST QUADRANT
025 NM SOUTHWEST QUADRANT
025 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 065 NM NORTHEAST QUADRANT
075 NM SOUTHEAST QUADRANT
075 NM SOUTHWEST QUADRANT
065 NM NORTHWEST QUADRANT
VECTOR TO 36 HR POSIT: 195 DEG/ 07 KTS
---
36 HRS, VALID AT:
220600Z --- 12.9S 92.0E
MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT
RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 070 NM NORTHEAST QUADRANT
080 NM SOUTHEAST QUADRANT
080 NM SOUTHWEST QUADRANT
070 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 190 DEG/ 06 KTS
---
EXTENDED OUTLOOK:
48 HRS, VALID AT:
221800Z --- 14.0S 91.8E
MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT
RADIUS OF 050 KT WINDS - 030 NM NORTHEAST QUADRANT
030 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
030 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 075 NM NORTHEAST QUADRANT
080 NM SOUTHEAST QUADRANT
080 NM SOUTHWEST QUADRANT
075 NM NORTHWEST QUADRANT
---
REMARKS:
202100Z POSITION NEAR 9.1S 93.3E.
TROPICAL CYCLONE (TC) 03S (BERTIE), LOCATED APPROXIMATELY 295 NM
NORTHWEST OF COCOS ISLANDS, HAS TRACKED SOUTH-SOUTHWESTWARD AT 03
KNOTS OVER THE PAST SIX HOURS. DURING THE NEXT 48 HOURS, TC 03S IS
FORECAST TO TRACK POLEWARD AROUND THE WESTERN PERIPHERY OF A LOW TO
MID LEVEL ANTICYCLONE CENTERED BETWEEN NORTHWEST AUSTRALIA AND SUMA-
TRA. THE INTENSITY OF TC 03S WILL INCREASE SLOWLY DUE TO LACK OF
SUBSTANTIAL OUTFLOW AND HIGHER VERTICAL WIND SHEAR POLEWARD OF THE
SYSTEM. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 201800Z IS 24 FEET. NEXT
WARNINGS AT 210900Z AND 212100Z.//
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#36 Postby HURAKAN » Sun Nov 20, 2005 4:48 pm

Image

LOOKING GOOD, REALLY GOOD!!!
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#37 Postby Forecaster Colby » Sun Nov 20, 2005 6:55 pm

Yeah, thats excellent. Strong cdo, good banding and starting to show some outflow.
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#38 Postby HURAKAN » Sun Nov 20, 2005 7:25 pm

20/2030 UTC 9.1S 93.0E T4.0/4.0 BERTIE -- South Indian Ocean


NOW WE HAVE A "HURRICANE."
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#39 Postby HURAKAN » Sun Nov 20, 2005 7:59 pm

HIGH SEAS WEATHER WARNING FOR METAREA 10 ISSUED BY THE
AUSTRALIAN BUREAU OF METEOROLOGY TROPICAL CYCLONE WARNING
CENTRE PERTH AT 0033UTC 21 NOVEMBER 2005

HURRICANE WARNING FOR THE WESTERN AREA

Please be aware, wind gusts can be a further 40 percent stronger than the
averages given here, and maximum waves may be up to twice the height.

SITUATION
At 0000UTC Tropical Cyclone Bertie located within 30 nautical miles of
Latitude eight decimal nine south [8.9S]
Longitude ninety three decimal zero east [93.0]
Recent movement south southwest at 3 knots.
Maximum winds 70 knots.
Central pressure 965 hPa.


AREA AFFECTED
Within 90 nautical miles of the centre, extending to 180 nautical miles in
southern quadrants.

FORECAST
Within 30 nautical miles of the centre, winds to 70 knots weakening to below 60
knots by 22/0000UTC. Very high seas and heavy swell.
Within 55 nautical miles winds above 48 knots with very rough to high seas and
moderate to heavy swell.
Within 90 nautical miles of the centre extending to 180 nautical miles in
southern quadrants, winds above 34 knots with rough to very rough seas and
moderate to heavy swell.

At 1200UTC 21 November: 10.4 south 92.3 east
965 hPa. Winds to 70 knots near centre.
At 0000UTC 22 November: 11.7 south 91.7 east
975 hPa. Winds to 55 knots near centre.

Next warning issued by 0700 UTC 21 November 2005.

WEATHER PERTH


BoM seems to think that Bertie is peaking.
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#40 Postby P.K. » Sun Nov 20, 2005 7:59 pm

Low cat 3 it looks like now. I won't change the title to severe TC until they do in the warnings though.

Edit - Removed BOM warning.
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