SPAC: ALFRED - Post-Tropical

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SPAC: ALFRED - Post-Tropical

#1 Postby wxman57 » Thu Feb 16, 2017 4:26 pm

Australia BoM has identified former 91P as a "tropical low", which is their terminology for a depression. ASCAT indicates winds are 30 kts:

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Re: SPAC: Tropical Depression 91P

#2 Postby 1900hurricane » Thu Feb 16, 2017 4:48 pm

It was looking pretty good on an AMSR2 pass from earlier.

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Re: SPAC: Tropical Depression 91P

#3 Postby Digital-TC-Chaser » Thu Feb 16, 2017 7:53 pm

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Re: SPAC: Tropical Depression 91P

#4 Postby Digital-TC-Chaser » Fri Feb 17, 2017 11:49 pm

IDD20020
TROPICAL CYCLONE TECHNICAL BULLETIN: AUSTRALIA - NORTHERN REGION
Issued by DARWIN TROPICAL CYCLONE WARNING CENTRE
at: 0205 UTC 18/02/2017
Name: Tropical Low
Identifier: 19U
Data At: 0000 UTC
Latitude: 16.4S
Longitude: 136.2E
Location Accuracy: within 25 nm [45 km]
Movement Towards: northwest [316 deg]
Speed of Movement: 7 knots [13 km/h]
Maximum 10-Minute Wind: 15 knots [30 km/h]
Maximum 3-Second Wind Gust: 45 knots [85 km/h]
Central Pressure: 1004 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:
Pressure of outermost isobar: 1008 hPa
Radius of outermost closed isobar: 150 nm [280 km]
FORECAST DATA
Date/Time : Location : Loc. Accuracy: Max Wind : Central Pressure
[UTC] : degrees : nm [km]: knots[km/h]: hPa
+06: 18/0600: 16.0S 136.1E: 050 [095]: 015 [030]: 1003
+12: 18/1200: 15.6S 136.1E: 075 [140]: 020 [035]: 1003
+18: 18/1800: 15.3S 136.2E: 095 [175]: 025 [045]: 1002
+24: 19/0000: 15.0S 136.5E: 120 [220]: 030 [055]: 1000
+36: 19/1200: 14.5S 137.2E: 150 [280]: 040 [075]: 994
+48: 20/0000: 14.9S 137.5E: 180 [335]: 050 [095]: 990
+60: 20/1200: 15.6S 137.9E: 240 [445]: 055 [100]: 987
+72: 21/0000: 16.2S 137.9E: 300 [555]: 040 [075]: 996
+96: 22/0000: 17.3S 137.7E: 350 [650]: 030 [055]: 1002
+120: 23/0000: 17.2S 135.6E: 380 [700]: 025 [045]: 1005
REMARKS:
The tropical low has turned northwards during the past 6 hours, but remains over
land. The 00UTC fix between Borroloola and Port McArthur is based on surface
obs. The low-level circulation is also evident in H-8 VIS animation. Deep
convection is restricted to the eastern sector mainly over water, with dry air
wrapping around the western flank. Dvorak analysis is unavailable due to the
system located over land.

The recent movement of the system has been northwards, due to a middle level
ridge building to the southwest. An amplifying upper trough from the southwest
is forecast to break the mid-level ridge on Monday, so that the tropical low is
expected to curve towards the south early next week.

CIMSS satellite winds indicate that the system lies in an environment favourable
for development with low vertical wind shear. A 200hPa ciculation to the
northwest of the LLCC is enhancing outflow in the southern sectors. Sea surface
temperatures are sufficiently warm at 30 degrees in southern Gulf of Carpentaria
waters. As a result, it is anticipated that the system has a high likelihood of
intensifying to tropical cyclone intensity over Gulf waters on Sunday. The
cyclone could reach category 2 intensity during Monday, if the environment
ramains favourable and if the tropical low remains over water. Later Monday or
during Tuesday, the cyclone is forecast to weaken under the influence of
increasing vertical wind shear and dry air wrapping into the circulation.
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Re: SPAC: Tropical Depression 91P

#5 Postby Steve820 » Sat Feb 18, 2017 5:58 pm

This thing is honestly looking better organized on satellite. Alfred anyone? Hopefully, as I've been waiting for a new Australian TC for a while now. Hoping it's not too strong though since it is really close to land and they might be hit hard in the event it gets strong. The land proximity should keep it weak, but you never know.
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Re: SPAC: Tropical Depression 91P

#6 Postby Digital-TC-Chaser » Sat Feb 18, 2017 6:31 pm

SEVERE WEATHER WARNING
for HEAVY RAINFALL
For people in parts of the
Gulf Country Forecast District.
Issued at 4:55 am Sunday, 19 February 2017.
Synoptic Situation:
At 4am EST Sunday, a tropical low was located on the northeast Northern Territory coast about 70 kilometers north northeast of Borroloola. The low is expected to move further northwards into Gulf of Carpentaria waters today. It may then intensify to Tropical Cyclone strength late today or overnight.
Currently the heaviest rainfall is focused nearer to the low on the Northern Territory side of the Gulf of Carpentaria. Bands of rain are expected to increase about the Queensland Gulf of Carpentaria coast and nearby inland west of Karumba through today however, particularly Sunday night into Monday, as the low (or tropical cyclone) intensifies and starts to track southwards back towards the coast. 24 hour rainfall totals of 100 to 150mm expected, possibly in excess of 200mm closer to the Gulf of Carpentaria coast.
This rainfall could be intense at times, particularly with thunderstorms, leading to localised flash flooding.
A TROPICAL CYCLONE WATCH IS CURRENT FOR COASTAL AREAS AND NEARBY INLAND FROM THE NT BORDER TO BURKETOWN [INCLUDING MORNINGTON ISLAND].


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Re: SPAC: Tropical Depression 91P

#7 Postby Digital-TC-Chaser » Sun Feb 19, 2017 4:28 pm

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intensifying.
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Re: SPAC: Tropical Cyclone Alfred

#8 Postby Digital-TC-Chaser » Sun Feb 19, 2017 6:46 pm

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Intensity: category 1, sustained winds near the centre of 65 kilometres per hour with wind gusts to 95 kilometres per hour.
Location: within 45 kilometres of 15.0 degrees South, 137.3 degrees East , 160 kilometres northeast of Borroloola and 160 kilometres southeast of Alyangula .
Movement: southeast at 12 kilometres per hour .

Tropical cyclone Alfred has formed in the southwest Gulf of Carpentaria and has recently commenced a track towards the southeast. Heavy rain and squally winds associated with the system are likely. The cyclone is forecast to weaken in the southern Gulf of Carpentaria prior to landfall during Tuesday.
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Re: SPAC: Tropical Depression 91P

#9 Postby Steve820 » Wed Feb 22, 2017 9:51 pm

Steve820 wrote:This thing is honestly looking better organized on satellite. Alfred anyone? Hopefully, as I've been waiting for a new Australian TC for a while now. Hoping it's not too strong though since it is really close to land and they might be hit hard in the event it gets strong. The land proximity should keep it weak, but you never know.


I'm somewhat late, but my wish came true... :D Luckily, because of the storm's land proximity, it was only weak.
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Hurricanes are an amazing natural phenomena. While many are spiraling pits of evil that kill people or cause devastation, some are tame and stay clear of land.

I wish for you to :Bcool:


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