c'est la ou j'ai un manque de compréhension pris sur Australian gouvernment meteorology ils l'identifient comme 26u. C'est assez complexe tous ça?
IDQ20018
TROPICAL CYCLONE TECHNICAL BULLETIN: AUSTRALIA - EASTERN REGION
Issued by BRISBANE TROPICAL CYCLONE WARNING CENTRE
at: 1934 UTC 11/05/2019
Name: Tropical Cyclone Ann
Identifier: 26U
Data At: 1800 UTC
Latitude: 16.2S
Longitude: 159.1E
Location Accuracy: within 30 nm [55 km]
Movement Towards: southwest [224 deg]
Speed of Movement: 8 knots [15 km/h]
Maximum 10-Minute Wind: 35 knots [65 km/h]
Maximum 3-Second Wind Gust: 50 knots [95 km/h]
Central Pressure: 1001 hPa
Radius of 34-knot winds NE quadrant: 20 nm [35 km]
Radius of 34-knot winds SE quadrant: 80 nm [150 km]
Radius of 34-knot winds SW quadrant: 90 nm [165 km]
Radius of 34-knot winds NW quadrant: 20 nm [35 km]
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: 20 nm [35 km]
Dvorak Intensity Code: T3.0/3.0/D1.0/24HRS
Pressure of outermost isobar: 1008 hPa
Radius of outermost closed isobar: 200 nm [370 km]
FORECAST DATA
Date/Time : Location : Loc. Accuracy: Max Wind : Central Pressure
[UTC] : degrees : nm [km]: knots[km/h]: hPa
+06: 12/0000: 16.0S 158.5E: 040 [080]: 040 [075]: 997
+12: 12/0600: 15.8S 157.8E: 055 [100]: 040 [075]: 997
+18: 12/1200: 15.5S 156.9E: 065 [125]: 040 [075]: 998
+24: 12/1800: 15.2S 155.9E: 080 [145]: 045 [085]: 995
+36: 13/0600: 14.7S 153.4E: 100 [185]: 045 [085]: 996
+48: 13/1800: 14.4S 150.7E: 120 [220]: 040 [075]: 999
+60: 14/0600: 13.8S 148.2E: 140 [255]: 030 [055]: 1004
+72: 14/1800: 13.2S 145.4E: 155 [290]: 025 [045]: 1007
+96: 15/1800: : : :
+120: 16/1800: : : :
REMARKS:
The tropical low 26U has continued to display evidence of intensification over
the past 12 to 24 hours, with somewhat sporadic bursts of deep convection
developing closer to and over the low level centre, and curvature gradually
increasing. Successive Ascat passes have also depicted a slow development of the
low level circulation, with the 1120 UTC pass showing areas of gales in both the
eastern and southern quadrants. The system has been upgraded to Tropical cyclone
Ann.
The track has been slowly to the south over the past few days under the
influence of a mid level ridge to the east. This feature is currently weakening
as an upper level trough moves east across the southern Coral Sea to the south
of the system. Following the passage of this trough, a new mid level ridge will
build to the south of Ann, which should lead to the system adopting a track to
the west-northwest later today, will little change in track over the following
few days apart from a slight increase in forward speed.
Ann is located in a relatively favourable environment for development in the
short term, with weak vertical wind shear, SST of around 28 deg C, and good
outflow aloft, particularly polewards. Further ahead, vertical shear is likely
to remain quite weak, but most model runs suggest upper divergence will become
more limited, while drier air above 500 hPa to the near southwest of the system,
evident in animated WV imagery, may also be gradually infiltrated into the
circulation. There are also indications of more limited ocean heat content along
the forecast track. With these factors in mind, Ann is forecast to develop a
little over the next day or so, before beginning a slow weakening trend, still
well to the east of the Queensland coast.
Copyright Commonwealth of Australia
==
The next bulletin for this system will be issued by: 12/0130 UTC by Brisbane
TCWC.