SW Pacific: TD 17

[P.K.]

Tropical Disturbance Summary For area Equator to 25S, 160E to 120W
issued from RSMC NADI Apr 21/0949 UTC 2006 UTC.

WEAK TROPICAL DEPRESSION 17F [1005HPA] RELOCATED TO 21S 177.5W MOVING
SOUTHSOUTHEAST. POSTION FAIR BASED ON MTSAT/IR, QUIKSCAT AND
PERIPHERAL SURFACE OBSERVATIONS. SST IN THE AREA IS ABOUT 28C.

17F IS A WEAK AND EXPOSED SYSTEM WITH ISOLATED DEEP CONVECTION
LOCATED TO THE SOUTH AND EAST OF THE LLCC. THE SYSTEM CURRENTLY LIES
IN AN AREA OF LOW ENVIRONMENTAL SHEAR AND IS LOCATED JUST TO THE EAST
OF AN UPPER 250HPA TROUGH, MAKING IT POSSIBLE FOR 17F TO DEEPEN BUT
NOT DEVELOP AS A TRULY TROPICAL SYSTEM AS IT CONTINIUES MOVING SOUTH
INTO HIGHER LATITUDES. GLOBAL MODELS AGREE ON MOVING THE SYSTEM
SOUTHWARDS AND SLIGHTLY DEEPENING THE DEPRESSION. AN INTENSE HIGH
PRESSURE TO THE EAST OF NEW ZEALAND EXTENDS A STRONG RIDGE NORTHWEST
AND A TIGHT PRESSURE GRADIENT IS EXPECTED TO BE MAINTAINED BETWEEN
THE RIDGE AND 17F AS THE DEPRESSION SINKS SOUTHWARDS. POTENTIAL FOR
17F TO DEVELOP INTO A TROPICAL CYCLONE IN THE NEXT 24 TO 48 HOURS IS
LOW.

NO OTHER SIGNIFICANT TROPICAL DISTURBANCES ANALYSED OR FORECAST IN
THE AREA.

[Matt-hurricanewatcher]

Wow I wish the nhc upgraded LLC like they do...There would about 50 a season coming off Africa.

[P.K.]

The pressure has risen a bit since being named a TD.

MARINE WEATHER BULLETIN FOR ISLANDS AREA
EQUATOR TO 25S BETWEEN 160E AND 120W.
ISSUED BY FIJI METEOROLOGICAL SERVICE EQUATOR to 25S between 160E and
120W
issued by Fiji Meteorological Service Apr 210800 UTC.

THIS WARNING CANCELS AND REPLACES WARNING 018.

PARTS 2 AND 3 : SYNOPSIS AND FORECAST VALID UNTIL Apr 220600 UTC.

WEAK TROPICAL DEPRESSION 17F [1003HPA] NEAR 21.0S 177.5W SLOW
MOVING. POSITION POOR.

WEAK TROPICAL DISTURBANCE TD [1006HPA] NEAR 15.5S 171E SLOW MOVING.

[Weatherfreak000]

Ok this was unexpected someone post sats?

[P.K.]

Sat images are here. Times are GMT +12.

[P.K.]

MARINE WEATHER BULLETIN FOR ISLANDS AREA
EQUATOR TO 25S BETWEEN 160E AND 120W.
ISSUED BY FIJI METEOROLOGICAL SERVICE Apr 212000 UTC.

PARTS 2 AND 3 : SYNOPSIS AND FORECAST VALID UNTIL Apr 221800 UTC.

WEAK TROPICAL DEPRESSION 17F [1003HPA] NEAR 21.0S 178W SLOW MOVING.
POSITION POOR.

WEAK TROPICAL DISTURBANCE TD [1006HPA] NEAR 16.0S 170E SLOW MOVING.

[Rod Hagen]

Is this the one responsible for the story about the rescue of 17 people by the Australian Navy in Tonga, PK?

see http://www.abc.net.au/news/newsitems/20 ... 621404.htm

Cheers

Rod

[P.K.]

Looks like it.

Tropical Disturbance Summary For area Equator to 25S, 160E to 120W
issued from RSMC NADI Apr 21/2253 UTC 2006 UTC.

WEAK TROPICAL DEPRESSION 17F [1004HPA] NEAR 21S 178.0W AT 212100UTC,
MOVING SOUTHSOUTHEAST. POSTION FAIR BASED ON MTSAT/IR/VIS, QUIKSCAT
AND PERIPHERAL SURFACE OBSERVATIONS. SST IN THE AREA IS ABOUT 28C.

17F IS A WEAK AND EXPOSED SYSTEM WITH ISOLATED DEEP CONVECTION
LOCATED TO THE SOUTH AND EAST OF THE LLCC. SYSTEM LIES IN AN AREA OF
LOW ENVIRONMENTAL SHEAR AND IS LOCATED JUST TO THE EAST OF AN UPPER
250HPA TROUGH. GLOBAL MODELS [AVN,UKGC,US] AGREE ON MOVING THE SYSTEM
SOUTHWARDS AND SLIGHTLY DEEPENING THE DEPRESSION. AN INTENSE HIGH
PRESSURE TO THE EAST OF NEW ZEALAND EXTENDS A STRONG RIDGE NORTHWEST
AND A TIGHT PRESSURE GRADIENT IS EXPECTED TO BE MAINTAINED BETWEEN
THE RIDGE AND 17F AS THE DEPRESSION SINKS SOUTHWARDS. POTENTIAL FOR
17F TO DEVELOP INTO A TROPICAL CYCLONE IN THE NEXT 24 TO 48 HOURS IS
LOW.

NO OTHER SIGNIFICANT TROPICAL DISTURBANCES ANALYSED OR FORECAST IN
THE AREA.

[P.K.]

MARINE WEATHER BULLETIN FOR ISLANDS AREA
EQUATOR TO 25S BETWEEN 160E AND 120W.
ISSUED BY FIJI METEOROLOGICAL SERVICE EQUATOR to 25S between 160E and
120W
issued by Fiji Meteorological Service Apr 220800 UTC.

PARTS 2 AND 3 : SYNOPSIS AND FORECAST VALID UNTIL Apr 230600 UTC.

DEPRESSION 17F [1002HPA] NEAR 24S 178W MOVING SOUTH 05 KNOTS. APART
FROM GALE WARNING 023 EXPECT CLOCKWISE WINDS 25 TO 30 KNOTS WITHIN
180 MILES OF CENTRE IN THE SOUTHERN SEMICRICLE AND 20 TO 25 KNOTS
WITHIN 100 MILES OF CENTRE IN THE NORTHERN SEMICIRCLE.

[P.K.]

MARINE WEATHER BULLETIN FOR ISLANDS AREA
EQUATOR TO 25S BETWEEN 160E AND 120W.
ISSUED BY FIJI METEOROLOGICAL SERVICE Apr 222000 UTC.

PART 1 : WARNING GALE WARNING 025 issued from RSMC NADI Apr 22/1907
UTC 2006 UTC.
IN AREA NORTH OF 25S AND SOUTH OF LINE 25S 176W 23S 170W 23S 160W:
EAST TO NORTHEAST WINDS 30 TO 35 KNOTS. AREA OF GALES MOVING SOUTH 05
KNOTS.
THIS WARNING CANCELS AND REPLACES WARNING 024.

PARTS 2 AND 3 : SYNOPSIS AND FORECAST VALID UNTIL Apr 231800 UTC.

DEPRESSION 17F [999HPA] NEAR 25S 178W MOVING SOUTH 05 KNOTS. EXPECT
CLOCKWISE WINDS 20 TO 25 KNOTS WITHIN 100 MILES OF CENTRE IN THE
NORTHERN SEMICIRCLE.

WEAK DEPRESSION TD1 [1010HPA] NEAR 22S 138W MOVING SOUTHEAST 20
KNOTS.

[HurricaneHunter914]

It is slowly getting organized.

[Coredesat]

It's extratropical now. Note that the word "tropical" is left out of the discussion, and it isn't mentioned in any of the tropical disturbance summaries.